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[p5sagit/p5-mst-13.2.git] / emacs / cperl-mode.el

;;; This code started from the following message of long time ago (IZ):

;;; From: olson@mcs.anl.gov (Bob Olson)
;;; Newsgroups: comp.lang.perl
;;; Subject: cperl-mode: Another perl mode for Gnuemacs
;;; Date: 14 Aug 91 15:20:01 GMT

;; Perl code editing commands for Emacs
;; Copyright (C) 1985-1996 Bob Olson, Ilya Zakharevich

;; This file is not (yet) part of GNU Emacs. It may be distributed
;; either under the same terms as GNU Emacs, or under the same terms
;; as Perl. You should have received a copy of Perl Artistic license
;; along with the Perl distribution.

;; GNU Emacs is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 2, or (at your option)
;; any later version.

;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING.  If not, write to the
;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.


;;; Corrections made by Ilya Zakharevich ilya@math.mps.ohio-state.edu
;;; XEmacs changes by Peter Arius arius@informatik.uni-erlangen.de

;; $Id: cperl-mode.el,v 1.31+ 1996/12/09 08:03:14 ilya Exp ilya $

;;; To use this mode put the following into your .emacs file:

;; (autoload 'perl-mode "cperl-mode" "alternate mode for editing Perl programs" t)

;;; You can either fine-tune the bells and whistles of this mode or
;;; bulk enable them by putting

;; (setq cperl-hairy t)

;;; in your .emacs file. (Emacs rulers do not consider it politically
;;; correct to make whistles enabled by default.)

;;; DO NOT FORGET to read micro-docs. (available from `Perl' menu). <<<<<<
;;; or as help on variables `cperl-tips', `cperl-problems',         <<<<<<
;;; `cperl-non-problems'.                                           <<<<<<

;;; Additional useful commands to put into your .emacs file:

;; (setq auto-mode-alist
;;       (append '(("\\.[pP][Llm]$" . perl-mode))  auto-mode-alist ))
;; (setq interpreter-mode-alist (append interpreter-mode-alist
;;                                      '(("miniperl" . perl-mode))))

;;; The mode information (on C-h m) provides customization help.
;;; If you use font-lock feature of this mode, it is advisable to use
;;; either lazy-lock-mode or fast-lock-mode (available on ELisp
;;; archive in files lazy-lock.el and fast-lock.el). I prefer lazy-lock.

;;; Faces used now: three faces for first-class and second-class keywords
;;; and control flow words, one for each: comments, string, labels,
;;; functions definitions and packages, arrays, hashes, and variable
;;; definitions. If you do not see all these faces, your font-lock does
;;; not define them, so you need to define them manually. Maybe you have 
;;; an obsolete font-lock from 19.28 or earlier. Upgrade.

;;; If you have a grayscale monitor, and do not have the variable
;;; font-lock-display-type bound to 'grayscale, insert 

;;; (setq font-lock-display-type 'grayscale)

;;; into your .emacs file.

;;;; This mode supports font-lock, imenu and mode-compile. In the
;;;; hairy version font-lock is on, but you should activate imenu
;;;; yourself (note that mode-compile is not standard yet). Well, you
;;;; can use imenu from keyboard anyway (M-x imenu), but it is better
;;;; to bind it like that:

;; (define-key global-map [M-S-down-mouse-3] 'imenu)

;;; In fact the version of font-lock that this version supports can be
;;; much newer than the version you actually have. This means that a
;;; lot of faces can be set up, but are not visible on your screen
;;; since the coloring rules for this faces are not defined.

;;; Updates: ========================================

;;; Made less hairy by default: parentheses not electric, 
;;; linefeed not magic. Bug with abbrev-mode corrected.

;;;; After 1.4:
;;;  Better indentation:
;;;  subs inside braces should work now, 
;;;  Toplevel braces obey customization.
;;;  indent-for-comment knows about bad cases, cperl-indent-for-comment
;;;  moves cursor to a correct place.
;;;  cperl-indent-exp written from the scratch! Slow... (quadratic!) :-( 
;;;        (50 secs on DB::DB (sub of 430 lines), 486/66)
;;;  Minor documentation fixes.
;;;  Imenu understands packages as prefixes (including nested).
;;;  Hairy options can be switched off one-by-one by setting to null.
;;;  Names of functions and variables changed to conform to `cperl-' style.

;;;; After 1.5:
;;;  Some bugs with indentation of labels (and embedded subs) corrected.
;;;  `cperl-indent-region' done (slow :-()).
;;;  `cperl-fill-paragraph' done.
;;;  Better package support for `imenu'.
;;;  Progress indicator for indentation (with `imenu' loaded).
;;;  `Cperl-set' was busted, now setting the individual hairy option 
;;;     should be better.

;;;; After 1.6:
;;; `cperl-set-style' done.
;;; `cperl-check-syntax' done.
;;; Menu done.
;;; New config variables `cperl-close-paren-offset' and `cperl-comment-column'.
;;; Bugs with `cperl-auto-newline' corrected.
;;; `cperl-electric-lbrace' can work with `cperl-auto-newline' in situation 
;;; like $hash{.

;;;; 1.7 XEmacs (arius@informatik.uni-erlangen.de):
;;; - use `next-command-event', if `next-command-events' does not exist
;;; - use `find-face' as def. of `is-face'
;;; - corrected def. of `x-color-defined-p'
;;; - added const defs for font-lock-comment-face,
;;;   font-lock-keyword-face and font-lock-function-name-face
;;; - added def. of font-lock-variable-name-face
;;; - added (require 'easymenu) inside an `eval-when-compile'
;;; - replaced 4-argument `substitute-key-definition' with ordinary
;;;   `define-key's
;;; - replaced `mark-active' in menu definition by `cperl-use-region-p'.
;;; Todo (at least):
;;; - use emacs-vers.el (http://www.cs.utah.edu/~eeide/emacs/emacs-vers.el.gz)
;;;   for portable code?
;;; - should `cperl-mode' do a 
;;;     (if (featurep 'easymenu) (easy-menu-add cperl-menu))
;;;   or should this be left to the user's `cperl-mode-hook'?

;;; Some bugs introduced by the above fix corrected (IZ ;-).
;;; Some bugs under XEmacs introduced by the correction corrected.

;;; Some more can remain since there are two many different variants. 
;;; Please feedback!

;;; We do not support fontification of arrays and hashes under 
;;; obsolete font-lock any more. Upgrade.

;;;; after 1.8 Minor bug with parentheses.
;;;; after 1.9 Improvements from Joe Marzot.
;;;; after 1.10
;;;  Does not need easymenu to compile under XEmacs.
;;;  `vc-insert-headers' should work better.
;;;  Should work with 19.29 and 19.12.
;;;  Small improvements to fontification.
;;;  Expansion of keywords does not depend on C-? being backspace.

;;; after 1.10+
;;; 19.29 and 19.12 supported.
;;; `cperl-font-lock-enhanced' deprecated. Use font-lock-extra.el.
;;; Support for font-lock-extra.el.

;;;; After 1.11:
;;; Tools submenu.
;;; Support for perl5-info.
;;; `imenu-go-find-at-position' in Tools requires imenu-go.el (see hints above)
;;; Imenu entries do not work with stock imenu.el. Patch sent to maintainers.
;;; Fontifies `require a if b;', __DATA__.
;;; Arglist for auto-fill-mode was incorrect.

;;;; After 1.12:
;;; `cperl-lineup-step' and `cperl-lineup' added: lineup constructions 
;;; vertically.
;;; `cperl-do-auto-fill' updated for 19.29 style.
;;; `cperl-info-on-command' now has a default.
;;; Workaround for broken C-h on XEmacs.
;;; VC strings escaped.
;;; C-h f now may prompt for function name instead of going on,
;;; controlled by `cperl-info-on-command-no-prompt'.

;;;; After 1.13:
;;; Msb buffer list includes perl files
;;; Indent-for-comment uses indent-to
;;; Can write tag files using etags.

;;;; After 1.14:
;;; Recognizes (tries to ;-) {...} which are not blocks during indentation.
;;; `cperl-close-paren-offset' affects ?\] too (and ?\} if not block)
;;; Bug with auto-filling comments started with "##" corrected.

;;;; Very slow now: on DB::DB 0.91, 486/66:

;;;Function Name                             Call Count  Elapsed Time  Average Time
;;;========================================  ==========  ============  ============
;;;cperl-block-p                             469         3.7799999999  0.0080597014
;;;cperl-get-state                           505         163.39000000  0.3235445544
;;;cperl-comment-indent                      12          0.0299999999  0.0024999999
;;;cperl-backward-to-noncomment              939         4.4599999999  0.0047497337
;;;cperl-calculate-indent                    505         172.22000000  0.3410297029
;;;cperl-indent-line                         505         172.88000000  0.3423366336
;;;cperl-use-region-p                        40          0.0299999999  0.0007499999
;;;cperl-indent-exp                          1           177.97000000  177.97000000
;;;cperl-to-comment-or-eol                   1453        3.9800000000  0.0027391603
;;;cperl-backward-to-start-of-continued-exp  9           0.0300000000  0.0033333333
;;;cperl-indent-region                       1           177.94000000  177.94000000

;;;; After 1.15:
;;; Takes into account white space after opening parentheses during indent.
;;; May highlight pods and here-documents: see `cperl-pod-here-scan',
;;; `cperl-pod-here-fontify', `cperl-pod-face'. Does not use this info
;;; for indentation so far.
;;; Fontification updated to 19.30 style. 
;;; The change 19.29->30 did not add all the required functionality,
;;;     but broke "font-lock-extra.el". Get "choose-color.el" from
;;;       ftp://ftp.math.ohio-state.edu/pub/users/ilya/emacs

;;;; After 1.16:
;;;       else # comment
;;;    recognized as a start of a block.
;;;  Two different font-lock-levels provided.
;;;  `cperl-pod-head-face' introduced. Used for highlighting.
;;;  `imenu' marks pods, +Packages moved to the head. 

;;;; After 1.17:
;;;  Scan for pods highlights here-docs too.
;;;  Note that the tag of here-doc may be rehighlighted later by lazy-lock.
;;;  Only one here-doc-tag per line is supported, and one in comment
;;;  or a string may break fontification.
;;;  POD headers were supposed to fill one line only.

;;;; After 1.18:
;;;  `font-lock-keywords' were set in 19.30 style _always_. Current scheme 
;;;    may  break under XEmacs.
;;;  `cperl-calculate-indent' dis suppose that `parse-start' was defined.
;;;  `fontified' tag is added to fontified text as well as `lazy-lock' (for
;;;    compatibility with older lazy-lock.el) (older one overfontifies
;;;    something nevertheless :-().
;;;  Will not indent something inside pod and here-documents.
;;;  Fontifies the package name after import/no/bootstrap.
;;;  Added new entry to menu with meta-info about the mode.

;;;; After 1.19:
;;;  Prefontification works much better with 19.29. Should be checked
;;;   with 19.30 as well.
;;;  Some misprints in docs corrected.
;;;  Now $a{-text} and -text => "blah" are fontified as strings too.
;;;  Now the pod search is much stricter, so it can help you to find
;;;    pod sections which are broken because of whitespace before =blah
;;;    - just observe the fontification.

;;;; After 1.20
;;;  Anonymous subs are indented with respect to the level of
;;;    indentation of `sub' now.
;;;  {} is recognized as hash after `bless' and `return'.
;;;  Anonymous subs are split by `cperl-linefeed' as well.
;;;  Electric parens embrace a region if present.
;;;  To make `cperl-auto-newline' useful,
;;;    `cperl-auto-newline-after-colon' is introduced.
;;;  `cperl-electric-parens' is now t or nul. The old meaning is moved to
;;;  `cperl-electric-parens-string'.
;;;  `cperl-toggle-auto-newline' introduced, put on C-c C-a.
;;;  `cperl-toggle-abbrev' introduced, put on C-c C-k.
;;;  `cperl-toggle-electric' introduced, put on C-c C-e.
;;;  Beginning-of-defun-regexp was not anchored.

;;;; After 1.21
;;;  Auto-newline grants `cperl-extra-newline-before-brace' if "{" is typed
;;;    after ")".
;;;  {} is recognized as expression after `tr' and friends.

;;;; After 1.22
;;;  Entry Hierarchy added to imenu. Very primitive so far.
;;;  One needs newer `imenu-go'.el. A patch to `imenu' is needed as well.
;;;  Writes its own TAGS files.
;;;  Class viewer based on TAGS files. Does not trace @ISA so far.
;;;  19.31: Problems with scan for PODs corrected.
;;;  First POD header correctly fontified.
;;;  I needed (setq imenu-use-keymap-menu t) to get good imenu in 19.31.
;;;  Apparently it makes a lot of hierarchy code obsolete...

;;;; After 1.23
;;;  Tags filler now scans *.xs as well.
;;;  The info from *.xs scan is used by the hierarchy viewer.
;;;  Hierarchy viewer documented.
;;;  Bug in 19.31 imenu documented.

;;;; After 1.24
;;;  New location for info-files mentioned,
;;;  Electric-; should work better.
;;;  Minor bugs with POD marking.

;;;; After 1.25 (probably not...)
;;;  `cperl-info-page' introduced.  
;;;  To make `uncomment-region' working, `comment-region' would
;;;  not insert extra space.
;;;  Here documents delimiters better recognized 
;;;  (empty one, and non-alphanums in quotes handled). May be wrong with 1<<14?
;;;  `cperl-db' added, used in menu.
;;;  imenu scan removes text-properties, for better debugging
;;;    - but the bug is in 19.31 imenu.
;;;  formats highlighted by font-lock and prescan, embedded comments
;;;  are not treated.
;;;  POD/friends scan merged in one pass.
;;;  Syntax class is not used for analyzing the code, only char-syntax
;;;  may be checked against _ or'ed with w.
;;;  Syntax class of `:' changed to be _.
;;;  `cperl-find-bad-style' added.

;;;; After 1.25
;;;  When search for here-documents, we ignore commented << in simplest cases.
;;;  `cperl-get-help' added, available on C-h v and from menu.
;;;  Auto-help added. Default with `cperl-hairy', switchable on/off
;;;   with startup variable `cperl-lazy-help-time' and from
;;;   menu. Requires `run-with-idle-timer'.
;;;  Highlighting of @abc{@efg} was wrong - interchanged two regexps.

;;;; After 1.27
;;;  Indentation: At toplevel after a label - fixed.
;;;  1.27 was put to archives in binary mode ===> DOSish :-(

;;;; After 1.28
;;;  Thanks to Martin Buchholz <mrb@Eng.Sun.COM>: misprints in
;;;  comments and docstrings corrected, XEmacs support cleaned up.
;;;  The closing parenths would enclose the region into matching
;;;  parens under the same conditions as the opening ones.
;;;  Minor updates to `cperl-short-docs'.
;;;  Will not consider <<= as start of here-doc.

;;;; After 1.29
;;;  Added an extra advice to look into Micro-docs. ;-).
;;;  Enclosing of region when you press a closing parenth is regulated by
;;;  `cperl-electric-parens-string'.
;;;  Minor updates to `cperl-short-docs'.
;;;  `initialize-new-tags-table' called only if present (Does this help
;;;     with generation of tags under XEmacs?).
;;;  When creating/updating tag files, new info is written at the old place,
;;;     or at the end (is this a wanted behaviour? I need this in perl build directory).

;;;; After 1.30
;;;  All the keywords from keywords.pl included (maybe with dummy explanation).
;;;  No auto-help inside strings, comment, here-docs, formats, and pods.
;;;  Shrinkwrapping of info, regulated by `cperl-max-help-size'.
;;;  Info on variables as well.
;;;  Recognision of HERE-DOCS improved yet more.
;;;  Autonewline works on `}' without warnings.
;;;  Autohelp works again on $_[0].

;;;; After 1.31
;;;  perl-descr.el found its author - hi, Johan!

(defvar cperl-extra-newline-before-brace nil
  "*Non-nil means that if, elsif, while, until, else, for, foreach
and do constructs look like:

        if ()
        {
        }

instead of:

        if () {
        }
")

(defvar cperl-indent-level 2
  "*Indentation of CPerl statements with respect to containing block.")
(defvar cperl-lineup-step nil
  "*`cperl-lineup' will always lineup at multiple of this number.
If `nil', the value of `cperl-indent-level' will be used.")
(defvar cperl-brace-imaginary-offset 0
  "*Imagined indentation of a Perl open brace that actually follows a statement.
An open brace following other text is treated as if it were this far
to the right of the start of its line.")
(defvar cperl-brace-offset 0
  "*Extra indentation for braces, compared with other text in same context.")
(defvar cperl-label-offset -2
  "*Offset of CPerl label lines relative to usual indentation.")
(defvar cperl-min-label-indent 1
  "*Minimal offset of CPerl label lines.")
(defvar cperl-continued-statement-offset 2
  "*Extra indent for lines not starting new statements.")
(defvar cperl-continued-brace-offset 0
  "*Extra indent for substatements that start with open-braces.
This is in addition to cperl-continued-statement-offset.")
(defvar cperl-close-paren-offset -1
  "*Extra indent for substatements that start with close-parenthesis.")

(defvar cperl-auto-newline nil
  "*Non-nil means automatically newline before and after braces,
and after colons and semicolons, inserted in CPerl code. The following
\\[cperl-electric-backspace] will remove the inserted whitespace.
Insertion after colons requires both this variable and 
`cperl-auto-newline-after-colon' set.")

(defvar cperl-auto-newline-after-colon nil
  "*Non-nil means automatically newline even after colons.
Subject to `cperl-auto-newline' setting.")

(defvar cperl-tab-always-indent t
  "*Non-nil means TAB in CPerl mode should always reindent the current line,
regardless of where in the line point is when the TAB command is used.")

(defvar cperl-font-lock nil
  "*Non-nil (and non-null) means CPerl buffers will use font-lock-mode.
Can be overwritten by `cperl-hairy' if nil.")

(defvar cperl-electric-lbrace-space nil
  "*Non-nil (and non-null) means { after $ in CPerl buffers should be preceeded by ` '.
Can be overwritten by `cperl-hairy' if nil.")

(defvar cperl-electric-parens-string "({[]})<"
  "*String of parentheses that should be electric in CPerl.")

(defvar cperl-electric-parens nil
  "*Non-nil (and non-null) means parentheses should be electric in CPerl.
Can be overwritten by `cperl-hairy' if nil.")
(defvar cperl-electric-parens-mark  
  (and window-system
       (or (and (boundp 'transient-mark-mode) ; For Emacs
                transient-mark-mode)
           (and (boundp 'zmacs-regions) ; For XEmacs
                zmacs-regions)))
  "*Not-nil means that electric parens look for active mark.
Default is yes if there is visual feedback on mark.")

(defvar cperl-electric-parens-mark (and window-system transient-mark-mode)
  "*Not-nil means that electric parens look for active mark.
Default is yes if there is visual feedback on mark.")

(defvar cperl-electric-linefeed nil
  "*If true, LFD should be hairy in CPerl, otherwise C-c LFD is hairy.
In any case these two mean plain and hairy linefeeds together.
Can be overwritten by `cperl-hairy' if nil.")

(defvar cperl-electric-keywords nil
  "*Not-nil (and non-null) means keywords are electric in CPerl.
Can be overwritten by `cperl-hairy' if nil.")

(defvar cperl-hairy nil
  "*Not-nil means all the bells and whistles are enabled in CPerl.")

(defvar cperl-comment-column 32
  "*Column to put comments in CPerl (use \\[cperl-indent]' to lineup with code).")

(defvar cperl-vc-header-alist '((SCCS "$sccs = '%W\%' ;")
                                (RCS "$rcs = ' $Id\$ ' ;"))
  "*What to use as `vc-header-alist' in CPerl.")

(defvar cperl-info-on-command-no-prompt nil
  "*Not-nil (and non-null) means not to prompt on C-h f.
The opposite behaviour is always available if prefixed with C-c.
Can be overwritten by `cperl-hairy' if nil.")

(defvar cperl-lazy-help-time nil
  "*Not-nil (and non-null) means to show lazy help after given idle time.")

(defvar cperl-pod-face 'font-lock-comment-face
  "*The result of evaluation of this expression is used for pod highlighting.")

(defvar cperl-pod-head-face 'font-lock-variable-name-face
  "*The result of evaluation of this expression is used for pod highlighting.
Font for POD headers.")

(defvar cperl-here-face 'font-lock-string-face
  "*The result of evaluation of this expression is used for here-docs highlighting.")

(defvar cperl-pod-here-fontify '(featurep 'font-lock)
  "*Not-nil after evaluation means to highlight pod and here-docs sections.")

(defvar cperl-pod-here-scan t
  "*Not-nil means look for pod and here-docs sections during startup.
You can always make lookup from menu or using \\[cperl-find-pods-heres].")

(defvar cperl-imenu-addback nil
  "*Not-nil means add backreferences to generated `imenu's.
May require patched `imenu' and `imenu-go'.")

(defvar cperl-max-help-size 66
  "*Non-nil means shrink-wrapping of info-buffer allowed up to these percents.")

(defvar cperl-shrink-wrap-info-frame t
  "*Non-nil means shrink-wrapping of info-buffer-frame allowed.")

(defvar cperl-info-page "perl"
  "Name of the info page containing perl docs.
Older version of this page was called `perl5', newer `perl'.")

\f

;;; Short extra-docs.

(defvar cperl-tips 'please-ignore-this-line
  "Get newest version of this package from
  ftp://ftp.math.ohio-state.edu/pub/users/ilya/emacs
and/or
  ftp://ftp.math.ohio-state.edu/pub/users/ilya/perl

Get support packages choose-color.el (or font-lock-extra.el before
19.30), imenu-go.el from the same place.  \(Look for other files there
too... ;-) Get a patch for imenu.el in 19.29.  Note that for 19.30 and
later you should use choose-color.el *instead* of font-lock-extra.el 
\(and you will not get smart highlighting in C :-().

Note that to enable Compile choices in the menu you need to install
mode-compile.el.

Get perl5-info from 
  $CPAN/doc/manual/info/perl-info.tar.gz
older version was on
  http://www.metronet.com:70/9/perlinfo/perl5/manual/perl5-info.tar.gz

If you use imenu-go, run imenu on perl5-info buffer (you can do it
from CPerl menu). If many files are related, generate TAGS files from
Tools/Tags submenu in CPerl menu.

If some class structure is too complicated, use Tools/Hierarchy-view
from CPerl menu, or hierarchic view of imenu. The second one uses the
current buffer only, the first one requires generation of TAGS from
CPerl/Tools/Tags menu beforehand.

Run CPerl/Tools/Insert-spaces-if-needed to fix your lazy typing.

Switch auto-help on/off with CPerl/Tools/Auto-help.

Before reporting (non-)problems look in the problem section on what I
know about them.")

(defvar cperl-problems 'please-ignore-this-line
"Emacs has a _very_ restricted syntax parsing engine. 

It may be corrected on the level of C code, please look in the
`non-problems' section if you want to volunteer.

CPerl mode tries to corrects some Emacs misunderstandings, however,
for efficiency reasons the degree of correction is different for
different operations. The partially corrected problems are: POD
sections, here-documents, regexps. The operations are: highlighting,
indentation, electric keywords, electric braces. 

This may be confusing, since the regexp s#//#/#\; may be highlighted
as a comment, but it will be recognized as a regexp by the indentation
code. Or the opposite case, when a pod section is highlighted, but
breaks the indentation of the following code.

The main trick (to make $ a \"backslash\") makes constructions like
${aaa} look like unbalanced braces. The only trick I can think of is
to insert it as $ {aaa} (legal in perl5, not in perl4). 

Similar problems arise in regexps, when /(\\s|$)/ should be rewritten
as /($|\\s)/. Note that such a transposition is not always possible
:-(.  " )

(defvar cperl-non-problems 'please-ignore-this-line
"As you know from `problems' section, Perl syntax is too hard for CPerl.

Most the time, if you write your own code, you may find an equivalent
\(and almost as readable) expression.

Try to help it: add comments with embedded quotes to fix CPerl
misunderstandings about the end of quotation:

$a='500$';      # ';

You won't need it too often. The reason: $ \"quotes\" the following
character (this saves a life a lot of times in CPerl), thus due to
Emacs parsing rules it does not consider tick after the dollar as a
closing one, but as a usual character.

Now the indentation code is pretty wise. The only drawback is that it
relies on Emacs parsing to find matching parentheses. And Emacs
*cannot* match parentheses in Perl 100% correctly. So
        1 if s#//#/#;
will not break indentation, but
        1 if ( s#//#/# );
will.

By similar reasons
        s\"abc\"def\";
will confuse CPerl a lot.

If you still get wrong indentation in situation that you think the
code should be able to parse, try:

a) Check what Emacs thinks about balance of your parentheses.
b) Supply the code to me (IZ).

Pods are treated _very_ rudimentally. Here-documents are not treated
at all (except highlighting and inhibiting indentation). (This may
change some time. RMS approved making syntax lookup recognize text
attributes, but volunteers are needed to change Emacs C code.)

To speed up coloring the following compromises exist:
   a) sub in $mypackage::sub may be highlighted.
   b) -z in [a-z] may be highlighted.
   c) if your regexp contains a keyword (like \"s\"), it may be highlighted.


Imenu in 19.31 is broken. Set `imenu-use-keymap-menu' to t, and remove
`car' before `imenu-choose-buffer-index' in `imenu'.
")

\f

;;; Portability stuff:

(defconst cperl-xemacs-p (string-match "XEmacs\\|Lucid" emacs-version))
(defmacro cperl-define-key (fsf-key definition &optional xemacs-key)
  `(define-key cperl-mode-map
     ,(if xemacs-key
          `(if cperl-xemacs-p ,xemacs-key ,fsf-key)
        fsf-key)
     ,definition))

(defvar del-back-ch (car (append (where-is-internal 'delete-backward-char)
                                 (where-is-internal 'backward-delete-char-untabify)))
  "Character generated by key bound to delete-backward-char.")

(and (vectorp del-back-ch) (= (length del-back-ch) 1) 
     (setq del-back-ch (aref del-back-ch 0)))

(if cperl-xemacs-p
    (progn
      ;; "Active regions" are on: use region only if active
      ;; "Active regions" are off: use region unconditionally
      (defun cperl-use-region-p ()
        (if zmacs-regions (mark) t))
      (defun cperl-mark-active () (mark)))
  (defun cperl-use-region-p ()
    (if transient-mark-mode mark-active t))
  (defun cperl-mark-active () mark-active))

(defsubst cperl-enable-font-lock ()
  (or cperl-xemacs-p window-system))

(if (boundp 'unread-command-events)
    (if cperl-xemacs-p
        (defun cperl-putback-char (c)   ; XEmacs >= 19.12
          (setq unread-command-events (list (character-to-event c))))
      (defun cperl-putback-char (c)     ; Emacs 19
        (setq unread-command-events (list c))))
  (defun cperl-putback-char (c)         ; XEmacs <= 19.11
    (setq unread-command-event (character-to-event c))))

(or (fboundp 'uncomment-region)
    (defun uncomment-region (beg end)
      (interactive "r")
      (comment-region beg end -1)))

(defvar cperl-do-not-fontify
  (if (string< emacs-version "19.30")
      'fontified
    'lazy-lock)
  "Text property which inhibits refontification.")

(defsubst cperl-put-do-not-fontify (from to)
  (put-text-property (max (point-min) (1- from))
                     to cperl-do-not-fontify t))

\f
;;; Probably it is too late to set these guys already, but it can help later:

(setq auto-mode-alist
      (append '(("\\.[pP][Llm]$" . perl-mode))  auto-mode-alist ))
(and (boundp 'interpreter-mode-alist)
     (setq interpreter-mode-alist (append interpreter-mode-alist
                                          '(("miniperl" . perl-mode)))))
(if (fboundp 'eval-when-compile)
    (eval-when-compile
      (condition-case nil
          (require 'imenu)
        (error nil))
      (condition-case nil
          (require 'easymenu)
        (error nil))
      ;; Calling `cperl-enable-font-lock' below doesn't compile on XEmacs,
      ;; macros instead of defsubsts don't work on Emacs, so we do the
      ;; expansion manually. Any other suggestions?
      (if (or (string-match "XEmacs\\|Lucid" emacs-version)
              window-system)
          (require 'font-lock))
      (require 'cl)
      ))

(defvar cperl-mode-abbrev-table nil
  "Abbrev table in use in Cperl-mode buffers.")

(add-hook 'edit-var-mode-alist '(perl-mode (regexp . "^cperl-")))

(defvar cperl-mode-map () "Keymap used in CPerl mode.")

(if cperl-mode-map nil
  (setq cperl-mode-map (make-sparse-keymap))
  (cperl-define-key "{" 'cperl-electric-lbrace)
  (cperl-define-key "[" 'cperl-electric-paren)
  (cperl-define-key "(" 'cperl-electric-paren)
  (cperl-define-key "<" 'cperl-electric-paren)
  (cperl-define-key "}" 'cperl-electric-brace)
  (cperl-define-key "]" 'cperl-electric-rparen)
  (cperl-define-key ")" 'cperl-electric-rparen)
  (cperl-define-key ";" 'cperl-electric-semi)
  (cperl-define-key ":" 'cperl-electric-terminator)
  (cperl-define-key "\C-j" 'newline-and-indent)
  (cperl-define-key "\C-c\C-j" 'cperl-linefeed)
  (cperl-define-key "\C-c\C-a" 'cperl-toggle-auto-newline)
  (cperl-define-key "\C-c\C-k" 'cperl-toggle-abbrev)
  (cperl-define-key "\C-c\C-e" 'cperl-toggle-electric)
  (cperl-define-key "\e\C-q" 'cperl-indent-exp) ; Usually not bound
  ;;(cperl-define-key "\M-q" 'cperl-fill-paragraph)
  ;;(cperl-define-key "\e;" 'cperl-indent-for-comment)
  (cperl-define-key "\177" 'cperl-electric-backspace)
  (cperl-define-key "\t" 'cperl-indent-command)
  ;; don't clobber the backspace binding:
  (cperl-define-key "\C-hf" 'cperl-info-on-command [(control h) f])
  (cperl-define-key "\C-c\C-hf" 'cperl-info-on-current-command
                    [(control c) (control h) f])
  (cperl-define-key "\C-hv" 'cperl-get-help [(control h) v])
  (if (and cperl-xemacs-p 
           (<= emacs-minor-version 11) (<= emacs-major-version 19))
      (progn
        ;; substitute-key-definition is usefulness-deenhanced...
        (cperl-define-key "\M-q" 'cperl-fill-paragraph)
        (cperl-define-key "\e;" 'cperl-indent-for-comment)
        (cperl-define-key "\e\C-\\" 'cperl-indent-region))
    (substitute-key-definition
     'indent-sexp 'cperl-indent-exp
     cperl-mode-map global-map)
    (substitute-key-definition
     'fill-paragraph 'cperl-fill-paragraph
     cperl-mode-map global-map)
    (substitute-key-definition
     'indent-region 'cperl-indent-region
     cperl-mode-map global-map)
    (substitute-key-definition
     'indent-for-comment 'cperl-indent-for-comment
     cperl-mode-map global-map)))

(condition-case nil
    (progn
      (require 'easymenu)
      (easy-menu-define cperl-menu cperl-mode-map "Menu for CPerl mode"
         '("Perl"
           ["Beginning of function" beginning-of-defun t]
           ["End of function" end-of-defun t]
           ["Mark function" mark-defun t]
           ["Indent expression" cperl-indent-exp t]
           ["Fill paragraph/comment" cperl-fill-paragraph t]
           ["Line up a construction" cperl-lineup (cperl-use-region-p)]
           "----"
           ["Indent region" cperl-indent-region (cperl-use-region-p)]
           ["Comment region" cperl-comment-region (cperl-use-region-p)]
           ["Uncomment region" cperl-uncomment-region (cperl-use-region-p)]
           "----"
           ["Run" mode-compile (fboundp 'mode-compile)]
           ["Kill" mode-compile-kill (and (fboundp 'mode-compile-kill)
                                          (get-buffer "*compilation*"))]
           ["Next error" next-error (get-buffer "*compilation*")]
           ["Check syntax" cperl-check-syntax (fboundp 'mode-compile)]
           "----"
           ["Debugger" cperl-db t]
           "----"
           ("Tools"
            ["Imenu" imenu (fboundp 'imenu)]
            ["Insert spaces if needed" cperl-find-bad-style t]
            ["Class Hierarchy from TAGS" cperl-tags-hier-init t]
            ;;["Update classes" (cperl-tags-hier-init t) tags-table-list]
            ["Imenu on info" cperl-imenu-on-info (featurep 'imenu)]
            ("Tags"
;;;          ["Create tags for current file" cperl-etags t]
;;;          ["Add tags for current file" (cperl-etags t) t]
;;;          ["Create tags for Perl files in directory" (cperl-etags nil t) t]
;;;          ["Add tags for Perl files in directory" (cperl-etags t t) t]
;;;          ["Create tags for Perl files in (sub)directories" 
;;;           (cperl-etags nil 'recursive) t]
;;;          ["Add tags for Perl files in (sub)directories"
;;;           (cperl-etags t 'recursive) t]) 
;;;; cperl-write-tags (&optional file erase recurse dir inbuffer)
             ["Create tags for current file" (cperl-write-tags nil t) t]
             ["Add tags for current file" (cperl-write-tags) t]
             ["Create tags for Perl files in directory" 
              (cperl-write-tags nil t nil t) t]
             ["Add tags for Perl files in directory" 
              (cperl-write-tags nil nil nil t) t]
             ["Create tags for Perl files in (sub)directories" 
              (cperl-write-tags nil t t t) t]
             ["Add tags for Perl files in (sub)directories"
              (cperl-write-tags nil nil t t) t])
            ["Recalculate PODs and HEREs" cperl-find-pods-heres t]
            ["Define word at point" imenu-go-find-at-position 
             (fboundp 'imenu-go-find-at-position)]
            ["Help on function" cperl-info-on-command t]
            ["Help on function at point" cperl-info-on-current-command t]
            ["Help on symbol at point" cperl-get-help t]
            ["Auto-help on" cperl-lazy-install (fboundp 'run-with-idle-timer)]
            ["Auto-help off" cperl-lazy-unstall 
             (fboundp 'run-with-idle-timer)])
           ("Toggle..."
            ["Auto newline" cperl-toggle-auto-newline t]
            ["Electric parens" cperl-toggle-electric t]
            ["Electric keywords" cperl-toggle-abbrev t]
            )
           ("Indent styles..."
            ["GNU" (cperl-set-style "GNU") t]
            ["C++" (cperl-set-style "C++") t]
            ["FSF" (cperl-set-style "FSF") t]
            ["BSD" (cperl-set-style "BSD") t]
            ["Whitesmith" (cperl-set-style "Whitesmith") t])
           ("Micro-docs"
            ["Tips" (describe-variable 'cperl-tips) t]
            ["Problems" (describe-variable 'cperl-problems) t]
            ["Non-problems" (describe-variable 'cperl-non-problems) t]))))
  (error nil))

(autoload 'c-macro-expand "cmacexp"
  "Display the result of expanding all C macros occurring in the region.
The expansion is entirely correct because it uses the C preprocessor."
  t)

(defvar cperl-mode-syntax-table nil
  "Syntax table in use in Cperl-mode buffers.")

(if cperl-mode-syntax-table
    ()
  (setq cperl-mode-syntax-table (make-syntax-table))
  (modify-syntax-entry ?\\ "\\" cperl-mode-syntax-table)
  (modify-syntax-entry ?/ "." cperl-mode-syntax-table)
  (modify-syntax-entry ?* "." cperl-mode-syntax-table)
  (modify-syntax-entry ?+ "." cperl-mode-syntax-table)
  (modify-syntax-entry ?- "." cperl-mode-syntax-table)
  (modify-syntax-entry ?= "." cperl-mode-syntax-table)
  (modify-syntax-entry ?% "." cperl-mode-syntax-table)
  (modify-syntax-entry ?< "." cperl-mode-syntax-table)
  (modify-syntax-entry ?> "." cperl-mode-syntax-table)
  (modify-syntax-entry ?& "." cperl-mode-syntax-table)
  (modify-syntax-entry ?$ "\\" cperl-mode-syntax-table)
  (modify-syntax-entry ?\n ">" cperl-mode-syntax-table)
  (modify-syntax-entry ?# "<" cperl-mode-syntax-table)
  (modify-syntax-entry ?' "\"" cperl-mode-syntax-table)
  (modify-syntax-entry ?` "\"" cperl-mode-syntax-table)
  (modify-syntax-entry ?_ "w" cperl-mode-syntax-table)
  (modify-syntax-entry ?: "_" cperl-mode-syntax-table)
  (modify-syntax-entry ?| "." cperl-mode-syntax-table))


\f
;; Make customization possible "in reverse"
;;(defun cperl-set (symbol to)
;;  (or (eq (symbol-value symbol) 'null) (set symbol to)))
(defsubst cperl-val (symbol &optional default hairy)
  (cond
   ((eq (symbol-value symbol) 'null) default)
   (cperl-hairy (or hairy t))
   (t (symbol-value symbol))))
\f
;; provide an alias for working with emacs 19.  the perl-mode that comes
;; with it is really bad, and this lets us seamlessly replace it.
(fset 'perl-mode 'cperl-mode)
(defun cperl-mode ()
  "Major mode for editing Perl code.
Expression and list commands understand all C brackets.
Tab indents for Perl code.
Paragraphs are separated by blank lines only.
Delete converts tabs to spaces as it moves back.

Various characters in Perl almost always come in pairs: {}, (), [],
sometimes <>. When the user types the first, she gets the second as
well, with optional special formatting done on {}.  (Disabled by
default.)  You can always quote (with \\[quoted-insert]) the left
\"paren\" to avoid the expansion. The processing of < is special,
since most the time you mean \"less\". Cperl mode tries to guess
whether you want to type pair <>, and inserts is if it
appropriate. You can set `cperl-electric-parens-string' to the string that
contains the parenths from the above list you want to be electrical.
Electricity of parenths is controlled by `cperl-electric-parens'.
You may also set `cperl-electric-parens-mark' to have electric parens
look for active mark and \"embrace\" a region if possible.'

CPerl mode provides expansion of the Perl control constructs:
   if, else, elsif, unless, while, until, for, and foreach.
=========(Disabled by default, see `cperl-electric-keywords'.)
The user types the keyword immediately followed by a space, which causes
the construct to be expanded, and the user is positioned where she is most
likely to want to be.
eg. when the user types a space following \"if\" the following appears in
the buffer:
            if () {     or   if ()
            }                 {
                              }
and the cursor is between the parentheses.  The user can then type some
boolean expression within the parens.  Having done that, typing
\\[cperl-linefeed] places you, appropriately indented on a new line
between the braces. If CPerl decides that you want to insert
\"English\" style construct like
            bite if angry;
it will not do any expansion. See also help on variable 
`cperl-extra-newline-before-brace'.

\\[cperl-linefeed] is a convenience replacement for typing carriage
return. It places you in the next line with proper indentation, or if
you type it inside the inline block of control construct, like
            foreach (@lines) {print; print}
and you are on a boundary of a statement inside braces, it will
transform the construct into a multiline and will place you into an
appropriately indented blank line. If you need a usual 
`newline-and-indent' behaviour, it is on \\[newline-and-indent], 
see documentation on `cperl-electric-linefeed'.

\\{cperl-mode-map}

Setting the variable `cperl-font-lock' to t switches on
font-lock-mode, `cperl-electric-lbrace-space' to t switches on
electric space between $ and {, `cperl-electric-parens-string' is the
string that contains parentheses that should be electric in CPerl (see
also `cperl-electric-parens-mark' and `cperl-electric-parens'),
setting `cperl-electric-keywords' enables electric expansion of
control structures in CPerl. `cperl-electric-linefeed' governs which
one of two linefeed behavior is preferable. You can enable all these
options simultaneously (recommended mode of use) by setting
`cperl-hairy' to t. In this case you can switch separate options off
by setting them to `null'. Note that one may undo the extra whitespace
inserted by semis and braces in `auto-newline'-mode by consequent
\\[cperl-electric-backspace].

If your site has perl5 documentation in info format, you can use commands
\\[cperl-info-on-current-command] and \\[cperl-info-on-command] to access it.
These keys run commands `cperl-info-on-current-command' and
`cperl-info-on-command', which one is which is controlled by variable
`cperl-info-on-command-no-prompt' (in turn affected by `cperl-hairy').

Even if you have no info-format documentation, short one-liner-style
help is available on \\[cperl-get-help]. 

It is possible to show this help automatically after some idle
time. This is regulated by variable `cperl-lazy-help-time'.  Default
with `cperl-hairy' is 5 secs idle time if the value of this variable
is nil.  It is also possible to switch this on/off from the
menu. Requires `run-with-idle-timer'.

Variables `cperl-pod-here-scan', `cperl-pod-here-fontify',
`cperl-pod-face', `cperl-pod-head-face' control processing of pod and
here-docs sections. In a future version results of scan may be used
for indentation too, currently they are used for highlighting only.

Variables controlling indentation style:
 `cperl-tab-always-indent'
    Non-nil means TAB in CPerl mode should always reindent the current line,
    regardless of where in the line point is when the TAB command is used.
 `cperl-auto-newline'
    Non-nil means automatically newline before and after braces,
    and after colons and semicolons, inserted in Perl code. The following
    \\[cperl-electric-backspace] will remove the inserted whitespace.
    Insertion after colons requires both this variable and 
    `cperl-auto-newline-after-colon' set. 
 `cperl-auto-newline-after-colon'
    Non-nil means automatically newline even after colons.
    Subject to `cperl-auto-newline' setting.
 `cperl-indent-level'
    Indentation of Perl statements within surrounding block.
    The surrounding block's indentation is the indentation
    of the line on which the open-brace appears.
 `cperl-continued-statement-offset'
    Extra indentation given to a substatement, such as the
    then-clause of an if, or body of a while, or just a statement continuation.
 `cperl-continued-brace-offset'
    Extra indentation given to a brace that starts a substatement.
    This is in addition to `cperl-continued-statement-offset'.
 `cperl-brace-offset'
    Extra indentation for line if it starts with an open brace.
 `cperl-brace-imaginary-offset'
    An open brace following other text is treated as if it the line started
    this far to the right of the actual line indentation.
 `cperl-label-offset'
    Extra indentation for line that is a label.
 `cperl-min-label-indent'
    Minimal indentation for line that is a label.

Settings for K&R and BSD indentation styles are
  `cperl-indent-level'                5    8
  `cperl-continued-statement-offset'  5    8
  `cperl-brace-offset'               -5   -8
  `cperl-label-offset'               -5   -8

If `cperl-indent-level' is 0, the statement after opening brace in column 0 is indented on `cperl-brace-offset'+`cperl-continued-statement-offset'.

Turning on CPerl mode calls the hooks in the variable `cperl-mode-hook'
with no args."
  (interactive)
  (kill-all-local-variables)
  ;;(if cperl-hairy
  ;;    (progn
  ;;    (cperl-set 'cperl-font-lock cperl-hairy)
  ;;    (cperl-set 'cperl-electric-lbrace-space cperl-hairy)
  ;;    (cperl-set 'cperl-electric-parens "{[(<")
  ;;    (cperl-set 'cperl-electric-keywords cperl-hairy)
  ;;    (cperl-set 'cperl-electric-linefeed cperl-hairy)))
  (use-local-map cperl-mode-map)
  (if (cperl-val 'cperl-electric-linefeed)
      (progn
        (local-set-key "\C-J" 'cperl-linefeed)
        (local-set-key "\C-C\C-J" 'newline-and-indent)))
  (if (cperl-val 'cperl-info-on-command-no-prompt)
      (progn
        ;; don't clobber the backspace binding:
        (cperl-define-key "\C-hf" 'cperl-info-on-current-command [(control h) f])
        (cperl-define-key "\C-c\C-hf" 'cperl-info-on-command
                          [(control c) (control h) f])))
  (setq major-mode 'perl-mode)
  (setq mode-name "CPerl")
  (if (not cperl-mode-abbrev-table)
      (let ((prev-a-c abbrevs-changed))
        (define-abbrev-table 'cperl-mode-abbrev-table '(
                ("if" "if" cperl-electric-keyword 0)
                ("elsif" "elsif" cperl-electric-keyword 0)
                ("while" "while" cperl-electric-keyword 0)
                ("until" "until" cperl-electric-keyword 0)
                ("unless" "unless" cperl-electric-keyword 0)
                ("else" "else" cperl-electric-else 0)
                ("for" "for" cperl-electric-keyword 0)
                ("foreach" "foreach" cperl-electric-keyword 0)
                ("do" "do" cperl-electric-keyword 0)))
        (setq abbrevs-changed prev-a-c)))
  (setq local-abbrev-table cperl-mode-abbrev-table)
  (abbrev-mode (if (cperl-val 'cperl-electric-keywords) 1 0))
  (set-syntax-table cperl-mode-syntax-table)
  (make-local-variable 'paragraph-start)
  (setq paragraph-start (concat "^$\\|" page-delimiter))
  (make-local-variable 'paragraph-separate)
  (setq paragraph-separate paragraph-start)
  (make-local-variable 'paragraph-ignore-fill-prefix)
  (setq paragraph-ignore-fill-prefix t)
  (make-local-variable 'indent-line-function)
  (setq indent-line-function 'cperl-indent-line)
  (make-local-variable 'require-final-newline)
  (setq require-final-newline t)
  (make-local-variable 'comment-start)
  (setq comment-start "# ")
  (make-local-variable 'comment-end)
  (setq comment-end "")
  (make-local-variable 'comment-column)
  (setq comment-column cperl-comment-column)
  (make-local-variable 'comment-start-skip)
  (setq comment-start-skip "#+ *")
  (make-local-variable 'defun-prompt-regexp)
  (setq defun-prompt-regexp "^[ \t]*sub[ \t]+\\([^ \t\n{;]+\\)[ \t]*")
  (make-local-variable 'comment-indent-function)
  (setq comment-indent-function 'cperl-comment-indent)
  (make-local-variable 'parse-sexp-ignore-comments)
  (setq parse-sexp-ignore-comments t)
  (make-local-variable 'indent-region-function)
  (setq indent-region-function 'cperl-indent-region)
  ;;(setq auto-fill-function 'cperl-do-auto-fill) ; Need to switch on and off!
  (make-local-variable 'imenu-create-index-function)
  (setq imenu-create-index-function
        (function imenu-example--create-perl-index))
  (make-local-variable 'imenu-sort-function)
  (setq imenu-sort-function nil)
  (make-local-variable 'vc-header-alist)
  (setq vc-header-alist cperl-vc-header-alist)
  (make-local-variable 'font-lock-defaults)
  (setq font-lock-defaults
        (if (string< emacs-version "19.30")
            '(perl-font-lock-keywords-2)
          '((perl-font-lock-keywords
             perl-font-lock-keywords-1
             perl-font-lock-keywords-2))))
  (or (fboundp 'cperl-old-auto-fill-mode)
      (progn
        (fset 'cperl-old-auto-fill-mode (symbol-function 'auto-fill-mode))
        (defun auto-fill-mode (&optional arg)
          (interactive "P")
          (cperl-old-auto-fill-mode arg)
          (and auto-fill-function (eq major-mode 'perl-mode)
               (setq auto-fill-function 'cperl-do-auto-fill)))))
  (if (cperl-enable-font-lock)
      (if (cperl-val 'cperl-font-lock) 
          (progn (or cperl-faces-init (cperl-init-faces))
                 (font-lock-mode 1))))
  (and (boundp 'msb-menu-cond)
       (not cperl-msb-fixed)
       (cperl-msb-fix))
  (if (featurep 'easymenu)
      (easy-menu-add cperl-menu))       ; A NOP under FSF Emacs.
  (run-hooks 'cperl-mode-hook)
  ;; After hooks since fontification will break this
  (if cperl-pod-here-scan (cperl-find-pods-heres)))
\f
;; Fix for perldb - make default reasonable
(defun cperl-db ()
  (interactive)
  (require 'gud)
  (perldb (read-from-minibuffer "Run perldb (like this): "
                                (if (consp gud-perldb-history)
                                    (car gud-perldb-history)
                                  (concat "perl " ;;(file-name-nondirectory
                                                   ;; I have problems
                                                   ;; in OS/2
                                                   ;; otherwise
                                                   (buffer-file-name)))
                                nil nil
                                '(gud-perldb-history . 1))))
\f
;; Fix for msb.el
(defvar cperl-msb-fixed nil)

(defun cperl-msb-fix ()
  ;; Adds perl files to msb menu, supposes that msb is already loaded
  (setq cperl-msb-fixed t)
  (let* ((l (length msb-menu-cond))
         (last (nth (1- l) msb-menu-cond))
         (precdr (nthcdr (- l 2) msb-menu-cond)) ; cdr of this is last
         (handle (1- (nth 1 last))))
    (setcdr precdr (list
                    (list
                     '(eq major-mode 'perl-mode)
                     handle
                     "Perl Files (%d)")
                    last))))
\f
;; This is used by indent-for-comment
;; to decide how much to indent a comment in CPerl code
;; based on its context. Do fallback if comment is found wrong.

(defvar cperl-wrong-comment)

(defun cperl-comment-indent ()
  (let ((p (point)) (c (current-column)) was)
    (if (looking-at "^#") 0             ; Existing comment at bol stays there.
      ;; Wrong comment found
      (save-excursion
        (setq was (cperl-to-comment-or-eol))
        (if (= (point) p)
            (progn
              (skip-chars-backward " \t")
              (max (1+ (current-column)) ; Else indent at comment column
                   comment-column))
          (if was nil
            (insert comment-start)
            (backward-char (length comment-start)))
          (setq cperl-wrong-comment t)
          (indent-to comment-column 1)  ; Indent minimum 1
          c)))))                        ; except leave at least one space.

;;;(defun cperl-comment-indent-fallback ()
;;;  "Is called if the standard comment-search procedure fails.
;;;Point is at start of real comment."
;;;  (let ((c (current-column)) target cnt prevc)
;;;    (if (= c comment-column) nil
;;;      (setq cnt (skip-chars-backward "[ \t]"))
;;;      (setq target (max (1+ (setq prevc 
;;;                          (current-column))) ; Else indent at comment column
;;;                comment-column))
;;;      (if (= c comment-column) nil
;;;     (delete-backward-char cnt)
;;;     (while (< prevc target)
;;;       (insert "\t")
;;;       (setq prevc (current-column)))
;;;     (if (> prevc target) (progn (delete-char -1) (setq prevc (current-column))))
;;;     (while (< prevc target)
;;;       (insert " ")
;;;       (setq prevc (current-column)))))))

(defun cperl-indent-for-comment ()
  "Substitute for `indent-for-comment' in CPerl."
  (interactive)
  (let (cperl-wrong-comment)
    (indent-for-comment)
    (if cperl-wrong-comment
        (progn (cperl-to-comment-or-eol)
               (forward-char (length comment-start))))))

(defun cperl-comment-region (b e arg)
  "Comment or uncomment each line in the region in CPerl mode.
See `comment-region'."
  (interactive "r\np")
  (let ((comment-start "#"))
    (comment-region b e arg)))

(defun cperl-uncomment-region (b e arg)
  "Uncomment or comment each line in the region in CPerl mode.
See `comment-region'."
  (interactive "r\np")
  (let ((comment-start "#"))
    (comment-region b e (- arg))))

(defvar cperl-brace-recursing nil)

(defun cperl-electric-brace (arg &optional only-before)
  "Insert character and correct line's indentation.
If ONLY-BEFORE and `cperl-auto-newline', will insert newline before the
place (even in empty line), but not after. If after \")\" and the inserted
char is \"{\", insert extra newline before only if 
`cperl-extra-newline-before-brace'."
  (interactive "P")
  (let (insertpos
        (other-end (if (and cperl-electric-parens-mark
                            (cperl-mark-active) 
                            (< (mark) (point)))
                       (mark) 
                     nil)))
    (if (and other-end
             (not cperl-brace-recursing)
             (cperl-val 'cperl-electric-parens)
             (>= (save-excursion (cperl-to-comment-or-eol) (point)) (point)))
        ;; Need to insert a matching pair
        (progn
          (save-excursion
            (setq insertpos (point-marker))
            (goto-char other-end)
            (setq last-command-char ?\{)
            (cperl-electric-lbrace arg insertpos))
          (forward-char 1))
      (if (and (not arg)                ; No args, end (of empty line or auto)
               (eolp)
               (or (and (null only-before)
                        (save-excursion
                          (skip-chars-backward " \t")
                          (bolp)))
                   (and (eq last-command-char ?\{) ; Do not insert newline
                        ;; if after ")" and `cperl-extra-newline-before-brace'
                        ;; is nil, do not insert extra newline.
                        (not cperl-extra-newline-before-brace)
                        (save-excursion
                          (skip-chars-backward " \t")
                          (eq (preceding-char) ?\))))
                   (if cperl-auto-newline 
                       (progn (cperl-indent-line) (newline) t) nil)))
          (progn
            (insert last-command-char)
            (cperl-indent-line)
            (if cperl-auto-newline
                (setq insertpos (1- (point))))
            (if (and cperl-auto-newline (null only-before))
                (progn
                  (newline)
                  (cperl-indent-line)))
            (save-excursion
              (if insertpos (progn (goto-char insertpos)
                                   (search-forward (make-string 
                                                    1 last-command-char))
                                   (setq insertpos (1- (point)))))
              (delete-char -1))))
      (if insertpos
          (save-excursion
            (goto-char insertpos)
            (self-insert-command (prefix-numeric-value arg)))
        (self-insert-command (prefix-numeric-value arg))))))

(defun cperl-electric-lbrace (arg &optional end)
  "Insert character, correct line's indentation, correct quoting by space."
  (interactive "P")
  (let (pos after 
            (cperl-brace-recursing t)
            (cperl-auto-newline cperl-auto-newline)
            (other-end (or end
                           (if (and cperl-electric-parens-mark
                                    (cperl-mark-active)
                                    (> (mark) (point)))
                               (save-excursion
                                 (goto-char (mark))
                                 (point-marker)) 
                             nil))))
    (and (cperl-val 'cperl-electric-lbrace-space)
         (eq (preceding-char) ?$)
         (save-excursion
           (skip-chars-backward "$")
           (looking-at "\\(\\$\\$\\)*\\$\\([^\\$]\\|$\\)"))
         (insert ? ))
    (if (cperl-after-expr-p nil "{};)") nil (setq cperl-auto-newline nil))
    (cperl-electric-brace arg)
    (and (cperl-val 'cperl-electric-parens)
         (eq last-command-char ?{)
         (memq last-command-char 
               (append cperl-electric-parens-string nil))
         (or (if other-end (goto-char (marker-position other-end)))
             t)
         (setq last-command-char ?} pos (point))
         (progn (cperl-electric-brace arg t)
                (goto-char pos)))))

(defun cperl-electric-paren (arg)
  "Insert a matching pair of parentheses."
  (interactive "P")
  (let ((beg (save-excursion (beginning-of-line) (point)))
        (other-end (if (and cperl-electric-parens-mark
                            (cperl-mark-active) 
                            (> (mark) (point)))
                           (save-excursion
                             (goto-char (mark))
                             (point-marker)) 
                     nil)))
    (if (and (cperl-val 'cperl-electric-parens)
             (memq last-command-char
                   (append cperl-electric-parens-string nil))
             (>= (save-excursion (cperl-to-comment-or-eol) (point)) (point))
             ;;(not (save-excursion (search-backward "#" beg t)))
             (if (eq last-command-char ?<)
                 (cperl-after-expr-p nil "{};(,:=")
               1))
        (progn
          (insert last-command-char)
          (if other-end (goto-char (marker-position other-end)))
          (insert (cdr (assoc last-command-char '((?{ .?})
                                                  (?[ . ?])
                                                  (?( . ?))
                                                  (?< . ?>)))))
          (forward-char -1))
      (insert last-command-char)
      )))

(defun cperl-electric-rparen (arg)
  "Insert a matching pair of parentheses if marking is active.
If not, or if we are not at the end of marking range, would self-insert."
  (interactive "P")
  (let ((beg (save-excursion (beginning-of-line) (point)))
        (other-end (if (and cperl-electric-parens-mark
                            (cperl-val 'cperl-electric-parens)
                            (memq last-command-char
                                  (append cperl-electric-parens-string nil))
                            (cperl-mark-active) 
                            (< (mark) (point)))
                       (mark) 
                     nil))
        p)
    (if (and other-end
             (cperl-val 'cperl-electric-parens)
             (memq last-command-char '( ?\) ?\] ?\} ?\> ))
             (>= (save-excursion (cperl-to-comment-or-eol) (point)) (point))
             ;;(not (save-excursion (search-backward "#" beg t)))
             )
        (progn
          (insert last-command-char)
          (setq p (point))
          (if other-end (goto-char other-end))
          (insert (cdr (assoc last-command-char '((?\} . ?\{)
                                                  (?\] . ?\[)
                                                  (?\) . ?\()
                                                  (?\> . ?\<)))))
          (goto-char (1+ p)))
      (call-interactively 'self-insert-command)
      )))

(defun cperl-electric-keyword ()
  "Insert a construction appropriate after a keyword."
  (let ((beg (save-excursion (beginning-of-line) (point))) 
        (dollar (eq last-command-char ?$)))
    (and (save-excursion
           (backward-sexp 1)
           (cperl-after-expr-p nil "{};:"))
         (save-excursion 
           (not 
            (re-search-backward
             "[#\"'`]\\|\\<q\\(\\|[wqx]\\)\\>"
             beg t)))
         (save-excursion (or (not (re-search-backward "^=" nil t))
                             (looking-at "=cut")))
         (progn
           (and dollar (insert " $"))
           (cperl-indent-line)
           ;;(insert " () {\n}")
           (cond
            (cperl-extra-newline-before-brace
             (insert " ()\n")
             (insert "{")
             (cperl-indent-line)
             (insert "\n")
             (cperl-indent-line)
             (insert "\n}"))
            (t
             (insert " () {\n}"))
            )
           (or (looking-at "[ \t]\\|$") (insert " "))
           (cperl-indent-line)
           (if dollar (progn (search-backward "$")
                             (forward-char 1))
             (search-backward ")"))
           (cperl-putback-char del-back-ch)))))

(defun cperl-electric-else ()
  "Insert a construction appropriate after a keyword."
  (let ((beg (save-excursion (beginning-of-line) (point))))
    (and (save-excursion
           (backward-sexp 1)
           (cperl-after-expr-p nil "{};:"))
         (save-excursion 
           (not 
            (re-search-backward
             "[#\"'`]\\|\\<q\\(\\|[wqx]\\)\\>"
             beg t)))
         (save-excursion (or (not (re-search-backward "^=" nil t))
                             (looking-at "=cut")))
         (progn
           (cperl-indent-line)
           ;;(insert " {\n\n}")
           (cond
            (cperl-extra-newline-before-brace
             (insert "\n")
             (insert "{")
             (cperl-indent-line)
             (insert "\n\n}"))
            (t
             (insert " {\n\n}"))
            )
           (or (looking-at "[ \t]\\|$") (insert " "))
           (cperl-indent-line)
           (forward-line -1)
           (cperl-indent-line)
           (cperl-putback-char del-back-ch)))))

(defun cperl-linefeed ()
  "Go to end of line, open a new line and indent appropriately."
  (interactive)
  (let ((beg (save-excursion (beginning-of-line) (point)))
        (end (save-excursion (end-of-line) (point)))
        (pos (point)) start)
    (if (and                            ; Check if we need to split:
                                        ; i.e., on a boundary and inside "{...}" 
         (save-excursion (cperl-to-comment-or-eol)
           (>= (point) pos))            ; Not in a comment
         (or (save-excursion
               (skip-chars-backward " \t" beg)
               (forward-char -1)
               (looking-at "[;{]"))     ; After { or ; + spaces
             (looking-at "[ \t]*}")     ; Before }
             (re-search-forward "\\=[ \t]*;" end t)) ; Before spaces + ;
         (save-excursion
           (and
            (eq (car (parse-partial-sexp pos end -1)) -1) 
                                        ; Leave the level of parens
            (looking-at "[,; \t]*\\($\\|#\\)") ; Comma to allow anon subr
                                        ; Are at end
            (progn
              (backward-sexp 1)
              (setq start (point-marker))
              (<= start pos)))))        ; Redundant? Are after the
                                        ; start of parens group.
        (progn
          (skip-chars-backward " \t")
          (or (memq (preceding-char) (append ";{" nil))
              (insert ";"))
          (insert "\n")
          (forward-line -1)
          (cperl-indent-line)
          (goto-char start)
          (or (looking-at "{[ \t]*$")   ; If there is a statement
                                        ; before, move it to separate line
              (progn
                (forward-char 1)
                (insert "\n")
                (cperl-indent-line)))
          (forward-line 1)              ; We are on the target line
          (cperl-indent-line)
          (beginning-of-line)
          (or (looking-at "[ \t]*}[,; \t]*$") ; If there is a statement
                                            ; after, move it to separate line
              (progn
                (end-of-line)
                (search-backward "}" beg)
                (skip-chars-backward " \t")
                (or (memq (preceding-char) (append ";{" nil))
                    (insert ";"))
                (insert "\n")
                (cperl-indent-line)
                (forward-line -1)))
          (forward-line -1)             ; We are on the line before target 
          (end-of-line)
          (newline-and-indent))
      (end-of-line)                     ; else
      (cond
       ((and (looking-at "\n[ \t]*{$")
             (save-excursion
               (skip-chars-backward " \t")
               (eq (preceding-char) ?\)))) ; Probably if () {} group
                                           ; with an extra newline.
        (forward-line 2)
        (cperl-indent-line))
       ((looking-at "\n[ \t]*$")        ; Next line is empty - use it.
        (forward-line 1)
        (cperl-indent-line))
       (t
        (newline-and-indent))))))

(defun cperl-electric-semi (arg)
  "Insert character and correct line's indentation."
  (interactive "P")
  (if cperl-auto-newline
      (cperl-electric-terminator arg)
    (self-insert-command (prefix-numeric-value arg))))

(defun cperl-electric-terminator (arg)
  "Insert character and correct line's indentation."
  (interactive "P")
  (let (insertpos (end (point)) 
                  (auto (and cperl-auto-newline
                             (or (not (eq last-command-char ?:))
                                 cperl-auto-newline-after-colon))))
    (if (and ;;(not arg) 
             (eolp)
             (not (save-excursion
                    (beginning-of-line)
                    (skip-chars-forward " \t")
                    (or
                     ;; Ignore in comment lines
                     (= (following-char) ?#)
                     ;; Colon is special only after a label
                     ;; So quickly rule out most other uses of colon
                     ;; and do no indentation for them.
                     (and (eq last-command-char ?:)
                          (save-excursion
                            (forward-word 1)
                            (skip-chars-forward " \t")
                            (and (< (point) end)
                                 (progn (goto-char (- end 1))
                                        (not (looking-at ":"))))))
                     (progn
                       (beginning-of-defun)
                       (let ((pps (parse-partial-sexp (point) end)))
                         (or (nth 3 pps) (nth 4 pps) (nth 5 pps))))))))
        (progn
          (insert last-command-char)
          ;;(forward-char -1)
          (if auto (setq insertpos (point-marker)))
          ;;(forward-char 1)
          (cperl-indent-line)
          (if auto
              (progn
                (newline)
                (cperl-indent-line)))
;;        (save-excursion
;;          (if insertpos (progn (goto-char (marker-position insertpos))
;;                               (search-forward (make-string 
;;                                                1 last-command-char))
;;                               (setq insertpos (1- (point)))))
;;          (delete-char -1))))
          (save-excursion
            (if insertpos (goto-char (1- (marker-position insertpos)))
              (forward-char -1))
            (delete-char 1))))
    (if insertpos
        (save-excursion
          (goto-char insertpos)
          (self-insert-command (prefix-numeric-value arg)))
      (self-insert-command (prefix-numeric-value arg)))))

(defun cperl-electric-backspace (arg)
  "Backspace-untabify, or remove the whitespace inserted by an electric key."
  (interactive "p")
  (if (and cperl-auto-newline 
           (memq last-command '(cperl-electric-semi 
                                cperl-electric-terminator
                                cperl-electric-lbrace))
           (memq (preceding-char) '(?  ?\t ?\n)))
      (let (p)
        (if (eq last-command 'cperl-electric-lbrace) 
            (skip-chars-forward " \t\n"))
        (setq p (point))
        (skip-chars-backward " \t\n")
        (delete-region (point) p))
    (backward-delete-char-untabify arg)))

(defun cperl-inside-parens-p ()
  (condition-case ()
      (save-excursion
        (save-restriction
          (narrow-to-region (point)
                            (progn (beginning-of-defun) (point)))
          (goto-char (point-max))
          (= (char-after (or (scan-lists (point) -1 1) (point-min))) ?\()))
    (error nil)))
\f
(defun cperl-indent-command (&optional whole-exp)
  "Indent current line as Perl code, or in some cases insert a tab character.
If `cperl-tab-always-indent' is non-nil (the default), always indent current line.
Otherwise, indent the current line only if point is at the left margin
or in the line's indentation; otherwise insert a tab.

A numeric argument, regardless of its value,
means indent rigidly all the lines of the expression starting after point
so that this line becomes properly indented.
The relative indentation among the lines of the expression are preserved."
  (interactive "P")
  (if whole-exp
      ;; If arg, always indent this line as Perl
      ;; and shift remaining lines of expression the same amount.
      (let ((shift-amt (cperl-indent-line))
            beg end)
        (save-excursion
          (if cperl-tab-always-indent
              (beginning-of-line))
          (setq beg (point))
          (forward-sexp 1)
          (setq end (point))
          (goto-char beg)
          (forward-line 1)
          (setq beg (point)))
        (if (> end beg)
            (indent-code-rigidly beg end shift-amt "#")))
    (if (and (not cperl-tab-always-indent)
             (save-excursion
               (skip-chars-backward " \t")
               (not (bolp))))
        (insert-tab)
      (cperl-indent-line))))

(defun cperl-indent-line (&optional symbol)
  "Indent current line as Perl code.
Return the amount the indentation changed by."
  (let (indent
        beg shift-amt
        (case-fold-search nil)
        (pos (- (point-max) (point))))
    (setq indent (cperl-calculate-indent nil symbol))
    (beginning-of-line)
    (setq beg (point))
    (cond ((eq indent nil)
           (setq indent (current-indentation)))
          ;;((eq indent t)    ; Never?
          ;; (setq indent (cperl-calculate-indent-within-comment)))
          ;;((looking-at "[ \t]*#")
          ;; (setq indent 0))
          (t
           (skip-chars-forward " \t")
           (if (listp indent) (setq indent (car indent)))
           (cond ((looking-at "[A-Za-z]+:[^:]")
                  (and (> indent 0)
                       (setq indent (max cperl-min-label-indent
                                         (+ indent cperl-label-offset)))))
                 ((= (following-char) ?})
                  (setq indent (- indent cperl-indent-level)))
                 ((memq (following-char) '(?\) ?\])) ; To line up with opening paren.
                  (setq indent (+ indent cperl-close-paren-offset)))
                 ((= (following-char) ?{)
                  (setq indent (+ indent cperl-brace-offset))))))
    (skip-chars-forward " \t")
    (setq shift-amt (- indent (current-column)))
    (if (zerop shift-amt)
        (if (> (- (point-max) pos) (point))
            (goto-char (- (point-max) pos)))
      (delete-region beg (point))
      (indent-to indent)
      ;; If initial point was within line's indentation,
      ;; position after the indentation.  Else stay at same point in text.
      (if (> (- (point-max) pos) (point))
          (goto-char (- (point-max) pos))))
    shift-amt))

(defun cperl-after-label ()
  ;; Returns true if the point is after label. Does not do save-excursion.
  (and (eq (preceding-char) ?:)
       (memq (char-syntax (char-after (- (point) 2)))
             '(?w ?_))
       (progn
         (backward-sexp)
         (looking-at "[a-zA-Z_][a-zA-Z0-9_]*:[^:]"))))

(defun cperl-get-state (&optional parse-start start-state)
  ;; returns list (START STATE DEPTH PRESTART), START is a good place
  ;; to start parsing, STATE is what is returned by
  ;; `parse-partial-sexp'. DEPTH is true is we are immediately after
  ;; end of block which contains START. PRESTART is the position
  ;; basing on which START was found.
  (save-excursion
    (let ((start-point (point)) depth state start prestart)
      (if parse-start
          (goto-char parse-start)
        (beginning-of-defun))
      (setq prestart (point))
      (if start-state nil
        ;; Try to go out, if sub is not on the outermost level
        (while (< (point) start-point)
          (setq start (point) parse-start start depth nil
                state (parse-partial-sexp start start-point -1))
          (if (> (car state) -1) nil
            ;; The current line could start like }}}, so the indentation
            ;; corresponds to a different level than what we reached
            (setq depth t)
            (beginning-of-line 2)))     ; Go to the next line.
        (if start (goto-char start)))   ; Not at the start of file
      (setq start (point))
      (if (< start start-point) (setq parse-start start))
      (or state (setq state (parse-partial-sexp start start-point -1 nil start-state)))
      (list start state depth prestart))))

(defun cperl-block-p ()                 ; Do not C-M-q ! One string contains ";" !
  ;; Positions is before ?\{. Checks whether it starts a block.
  ;; No save-excursion!
  (cperl-backward-to-noncomment (point-min))
  ;;(skip-chars-backward " \t\n\f")
  (or (memq (preceding-char) (append ";){}$@&%\C-@" nil)) ; Or label! \C-@ at bobp
                                        ; Label may be mixed up with `$blah :'
      (save-excursion (cperl-after-label))
      (and (memq (char-syntax (preceding-char)) '(?w ?_))
           (progn
             (backward-sexp)
             ;; Need take into account `bless', `return', `tr',...
             (or (and (looking-at "[a-zA-Z0-9_:]+[ \t\n\f]*[{#]") ; Method call syntax
                      (not (looking-at "\\(bless\\|return\\|qw\\|tr\\|[smy]\\)\\>")))
                 (progn
                   (skip-chars-backward " \t\n\f")
                   (and (memq (char-syntax (preceding-char)) '(?w ?_))
                        (progn
                          (backward-sexp)
                          (looking-at 
                           "sub[ \t]+[a-zA-Z0-9_:]+[ \t\n\f]*[#{]")))))))))

(defun cperl-calculate-indent (&optional parse-start symbol)
  "Return appropriate indentation for current line as Perl code.
In usual case returns an integer: the column to indent to.
Returns nil if line starts inside a string, t if in a comment."
  (save-excursion
    (if (memq (get-text-property (point) 'syntax-type) '(pod here-doc)) nil
      (beginning-of-line)
      (let* ((indent-point (point))
             (case-fold-search nil)
             (s-s (cperl-get-state))
             (start (nth 0 s-s))
             (state (nth 1 s-s))
             (containing-sexp (car (cdr state)))
             (char-after (save-excursion
                           (skip-chars-forward " \t")
                           (following-char)))
             (start-indent (save-excursion
                             (goto-char start)
                             (- (current-indentation)
                                (if (nth 2 s-s) cperl-indent-level 0))))
             old-indent)
        ;;      (or parse-start (null symbol)
        ;;        (setq parse-start (symbol-value symbol) 
        ;;              start-indent (nth 2 parse-start) 
        ;;              parse-start (car parse-start)))
        ;;      (if parse-start
        ;;        (goto-char parse-start)
        ;;      (beginning-of-defun))
        ;;      ;; Try to go out
        ;;      (while (< (point) indent-point)
        ;;      (setq start (point) parse-start start moved nil
        ;;            state (parse-partial-sexp start indent-point -1))
        ;;      (if (> (car state) -1) nil
        ;;        ;; The current line could start like }}}, so the indentation
        ;;        ;; corresponds to a different level than what we reached
        ;;        (setq moved t)
        ;;        (beginning-of-line 2)))       ; Go to the next line.
        ;;      (if start                               ; Not at the start of file
        ;;        (progn
        ;;          (goto-char start)
        ;;          (setq start-indent (current-indentation))
        ;;          (if moved                   ; Should correct...
        ;;              (setq start-indent (- start-indent cperl-indent-level))))
        ;;      (setq start-indent 0))
        ;;      (if (< (point) indent-point) (setq parse-start (point)))
        ;;      (or state (setq state (parse-partial-sexp 
        ;;                           (point) indent-point -1 nil start-state)))
        ;;      (setq containing-sexp 
        ;;          (or (car (cdr state)) 
        ;;              (and (>= (nth 6 state) 0) old-containing-sexp))
        ;;          old-containing-sexp nil start-state nil)
;;;;      (while (< (point) indent-point)
;;;;    (setq parse-start (point))
;;;;    (setq state (parse-partial-sexp (point) indent-point -1 nil start-state))
;;;;    (setq containing-sexp 
;;;;          (or (car (cdr state)) 
;;;;              (and (>= (nth 6 state) 0) old-containing-sexp))
;;;;          old-containing-sexp nil start-state nil))
        ;;      (if symbol (set symbol (list indent-point state start-indent)))
        ;;      (goto-char indent-point)
        (cond ((or (nth 3 state) (nth 4 state))
               ;; return nil or t if should not change this line
               (nth 4 state))
              ((null containing-sexp)
               ;; Line is at top level.  May be data or function definition,
               ;; or may be function argument declaration.
               ;; Indent like the previous top level line
               ;; unless that ends in a closeparen without semicolon,
               ;; in which case this line is the first argument decl.
               (skip-chars-forward " \t")
               (+ start-indent
                  (if (= (following-char) ?{) cperl-continued-brace-offset 0)
                  (progn
                    (cperl-backward-to-noncomment (or parse-start (point-min)))
                    ;;(skip-chars-backward " \t\f\n")
                    ;; Look at previous line that's at column 0
                    ;; to determine whether we are in top-level decls
                    ;; or function's arg decls.  Set basic-indent accordingly.
                    ;; Now add a little if this is a continuation line.
                    (if (or (bobp)
                            (memq (preceding-char) (append " ;}" nil)) ; Was ?\)
                            (memq char-after (append ")]}" nil))
                            (and (eq (preceding-char) ?\:) ; label
                                 (progn
                                   (forward-sexp -1)
                                   (skip-chars-backward " \t")
                                   (looking-at "[ \t]*[a-zA-Z_][a-zA-Z_0-9]*[ \t]*:")))) 
                        0
                      cperl-continued-statement-offset))))
              ((/= (char-after containing-sexp) ?{)
               ;; line is expression, not statement:
               ;; indent to just after the surrounding open,
               ;; skip blanks if we do not close the expression.
               (goto-char (1+ containing-sexp))
               (or (memq char-after (append ")]}" nil))
                   (looking-at "[ \t]*\\(#\\|$\\)")
                   (skip-chars-forward " \t"))
               (current-column))
              ((progn
                 ;; Containing-expr starts with \{. Check whether it is a hash.
                 (goto-char containing-sexp)
                 (not (cperl-block-p)))
               (goto-char (1+ containing-sexp))
               (or (eq char-after ?\})
                   (looking-at "[ \t]*\\(#\\|$\\)")
                   (skip-chars-forward " \t"))
               (+ (current-column)      ; Correct indentation of trailing ?\}
                  (if (eq char-after ?\}) (+ cperl-indent-level
                                             cperl-close-paren-offset) 
                    0)))
              (t
               ;; Statement level.  Is it a continuation or a new statement?
               ;; Find previous non-comment character.
               (goto-char indent-point)
               (cperl-backward-to-noncomment containing-sexp)
               ;; Back up over label lines, since they don't
               ;; affect whether our line is a continuation.
               (while (or (eq (preceding-char) ?\,)
                          (and (eq (preceding-char) ?:)
                               (or;;(eq (char-after (- (point) 2)) ?\') ; ????
                                (memq (char-syntax (char-after (- (point) 2)))
                                      '(?w ?_)))))
                 (if (eq (preceding-char) ?\,)
                     ;; Will go to beginning of line, essentially.
                     ;; Will ignore embedded sexpr XXXX.
                     (cperl-backward-to-start-of-continued-exp containing-sexp))
                 (beginning-of-line)
                 (cperl-backward-to-noncomment containing-sexp))
               ;; Now we get the answer.
               (if (not (memq (preceding-char) (append ", ;}{" '(nil)))) ; Was ?\,
                   ;; This line is continuation of preceding line's statement;
                   ;; indent  `cperl-continued-statement-offset'  more than the
                   ;; previous line of the statement.
                   (progn
                     (cperl-backward-to-start-of-continued-exp containing-sexp)
                     (+ (if (memq char-after (append "}])" nil))
                            0           ; Closing parenth
                          cperl-continued-statement-offset)
                        (current-column)
                        (if (eq char-after ?\{)
                            cperl-continued-brace-offset 0)))
                 ;; This line starts a new statement.
                 ;; Position following last unclosed open.
                 (goto-char containing-sexp)
                 ;; Is line first statement after an open-brace?
                 (or
                  ;; If no, find that first statement and indent like
                  ;; it.  If the first statement begins with label, do
                  ;; not believe when the indentation of the label is too
                  ;; small.
                  (save-excursion
                    (forward-char 1)
                    (setq old-indent (current-indentation))
                    (let ((colon-line-end 0))
                      (while (progn (skip-chars-forward " \t\n")
                                    (looking-at "#\\|[a-zA-Z0-9_$]*:[^:]"))
                        ;; Skip over comments and labels following openbrace.
                        (cond ((= (following-char) ?\#)
                               (forward-line 1))
                              ;; label:
                              (t
                               (save-excursion (end-of-line)
                                               (setq colon-line-end (point)))
                               (search-forward ":"))))
                      ;; The first following code counts
                      ;; if it is before the line we want to indent.
                      (and (< (point) indent-point)
                           (if (> colon-line-end (point)) ; After label
                               (if (> (current-indentation) 
                                      cperl-min-label-indent)
                                   (- (current-indentation) cperl-label-offset)
                                 ;; Do not believe: `max' is involved
                                 (+ old-indent cperl-indent-level))
                             (current-column)))))
                  ;; If no previous statement,
                  ;; indent it relative to line brace is on.
                  ;; For open brace in column zero, don't let statement
                  ;; start there too.  If cperl-indent-level is zero,
                  ;; use cperl-brace-offset + cperl-continued-statement-offset instead.
                  ;; For open-braces not the first thing in a line,
                  ;; add in cperl-brace-imaginary-offset.

                  ;; If first thing on a line:  ?????
                  (+ (if (and (bolp) (zerop cperl-indent-level))
                         (+ cperl-brace-offset cperl-continued-statement-offset)
                       cperl-indent-level)
                     ;; Move back over whitespace before the openbrace.
                     ;; If openbrace is not first nonwhite thing on the line,
                     ;; add the cperl-brace-imaginary-offset.
                     (progn (skip-chars-backward " \t")
                            (if (bolp) 0 cperl-brace-imaginary-offset))
                     ;; If the openbrace is preceded by a parenthesized exp,
                     ;; move to the beginning of that;
                     ;; possibly a different line
                     (progn
                       (if (eq (preceding-char) ?\))
                           (forward-sexp -1))
                       ;; In the case it starts a subroutine, indent with
                       ;; respect to `sub', not with respect to the the
                       ;; first thing on the line, say in the case of
                       ;; anonymous sub in a hash.
                       ;;
                       (skip-chars-backward " \t")
                       (if (and (eq (preceding-char) ?b)
                                (progn
                                  (forward-word -1)
                                  (looking-at "sub\\>"))
                                (setq old-indent 
                                      (nth 1 
                                           (parse-partial-sexp 
                                            (save-excursion (beginning-of-line) (point)) 
                                            (point)))))
                           (progn (goto-char (1+ old-indent))
                                  (skip-chars-forward " \t")
                                  (current-column))
                         ;; Get initial indentation of the line we are on.
                         ;; If line starts with label, calculate label indentation
                         (if (save-excursion
                               (beginning-of-line)
                               (looking-at "[ \t]*[a-zA-Z_][a-zA-Z_]*:[^:]"))
                             (if (> (current-indentation) cperl-min-label-indent)
                                 (- (current-indentation) cperl-label-offset)
                               (cperl-calculate-indent 
                                (if (and parse-start (<= parse-start (point)))
                                    parse-start)))
                           (current-indentation)))))))))))))

(defvar cperl-indent-alist
  '((string nil)
    (comment nil)
    (toplevel 0)
    (toplevel-after-parenth 2)
    (toplevel-continued 2)
    (expression 1))
  "Alist of indentation rules for CPerl mode.
The values mean:
  nil: do not indent;
  number: add this amount of indentation.")

(defun cperl-where-am-i (&optional parse-start start-state)
  ;; Unfinished
  "Return a list of lists ((TYPE POS)...) of good points before the point.
POS may be nil if it is hard to find, say, when TYPE is `string' or `comment'."
  (save-excursion
    (let* ((start-point (point))
           (s-s (cperl-get-state))
           (start (nth 0 s-s))
           (state (nth 1 s-s))
           (prestart (nth 3 s-s))
           (containing-sexp (car (cdr state)))
           (case-fold-search nil)
           (res (list (list 'parse-start start) (list 'parse-prestart prestart))))
      (cond ((nth 3 state)              ; In string
             (setq res (cons (list 'string nil (nth 3 state)) res))) ; What started string
            ((nth 4 state)              ; In comment
             (setq res (cons '(comment) res)))
            ((null containing-sexp)
             ;; Line is at top level.  
             ;; Indent like the previous top level line
             ;; unless that ends in a closeparen without semicolon,
             ;; in which case this line is the first argument decl.
             (cperl-backward-to-noncomment (or parse-start (point-min)))
             ;;(skip-chars-backward " \t\f\n")
             (cond
              ((or (bobp)
                   (memq (preceding-char) (append ";}" nil)))
               (setq res (cons (list 'toplevel start) res)))
              ((eq (preceding-char) ?\) )
               (setq res (cons (list 'toplevel-after-parenth start) res)))
              (t 
               (setq res (cons (list 'toplevel-continued start) res)))))
            ((/= (char-after containing-sexp) ?{)
             ;; line is expression, not statement:
             ;; indent to just after the surrounding open.
             ;; skip blanks if we do not close the expression.
             (setq res (cons (list 'expression-blanks
                                   (progn
                                     (goto-char (1+ containing-sexp))
                                     (or (looking-at "[ \t]*\\(#\\|$\\)")
                                         (skip-chars-forward " \t"))
                                     (point)))
                             (cons (list 'expression containing-sexp) res))))
            ((progn
              ;; Containing-expr starts with \{. Check whether it is a hash.
              (goto-char containing-sexp)
              (not (cperl-block-p)))
             (setq res (cons (list 'expression-blanks
                                   (progn
                                     (goto-char (1+ containing-sexp))
                                     (or (looking-at "[ \t]*\\(#\\|$\\)")
                                         (skip-chars-forward " \t"))
                                     (point)))
                             (cons (list 'expression containing-sexp) res))))
            (t
             ;; Statement level.
             (setq res (cons (list 'in-block containing-sexp) res))
             ;; Is it a continuation or a new statement?
             ;; Find previous non-comment character.
             (cperl-backward-to-noncomment containing-sexp)
             ;; Back up over label lines, since they don't
             ;; affect whether our line is a continuation.
             ;; Back up comma-delimited lines too ?????
             (while (or (eq (preceding-char) ?\,)
                        (save-excursion (cperl-after-label)))
               (if (eq (preceding-char) ?\,)
                   ;; Will go to beginning of line, essentially
                     ;; Will ignore embedded sexpr XXXX.
                   (cperl-backward-to-start-of-continued-exp containing-sexp))
               (beginning-of-line)
               (cperl-backward-to-noncomment containing-sexp))
             ;; Now we get the answer.
             (if (not (memq (preceding-char) (append ";}{" '(nil)))) ; Was ?\,
                 ;; This line is continuation of preceding line's statement.
                 (list (list 'statement-continued containing-sexp))
               ;; This line starts a new statement.
               ;; Position following last unclosed open.
               (goto-char containing-sexp)
               ;; Is line first statement after an open-brace?
               (or
                ;; If no, find that first statement and indent like
                ;; it.  If the first statement begins with label, do
                ;; not believe when the indentation of the label is too
                ;; small.
                (save-excursion
                  (forward-char 1)
                  (let ((colon-line-end 0))
                    (while (progn (skip-chars-forward " \t\n" start-point)
                                  (and (< (point) start-point)
                                       (looking-at
                                        "#\\|[a-zA-Z_][a-zA-Z0-9_]*:[^:]")))
                      ;; Skip over comments and labels following openbrace.
                      (cond ((= (following-char) ?\#)
                             ;;(forward-line 1)
                             (end-of-line))
                            ;; label:
                            (t
                             (save-excursion (end-of-line)
                                             (setq colon-line-end (point)))
                             (search-forward ":"))))
                    ;; Now at the point, after label, or at start 
                    ;; of first statement in the block.
                    (and (< (point) start-point)
                         (if (> colon-line-end (point)) 
                             ;; Before statement after label
                             (if (> (current-indentation) 
                                    cperl-min-label-indent)
                                 (list (list 'label-in-block (point)))
                               ;; Do not believe: `max' is involved
                               (list
                                (list 'label-in-block-min-indent (point))))
                           ;; Before statement
                           (list 'statement-in-block (point))))))
                ;; If no previous statement,
                ;; indent it relative to line brace is on.
                ;; For open brace in column zero, don't let statement
                ;; start there too.  If cperl-indent-level is zero,
                ;; use cperl-brace-offset + cperl-continued-statement-offset instead.
                ;; For open-braces not the first thing in a line,
                ;; add in cperl-brace-imaginary-offset.

                ;; If first thing on a line:  ?????
                (+ (if (and (bolp) (zerop cperl-indent-level))
                       (+ cperl-brace-offset cperl-continued-statement-offset)
                     cperl-indent-level)
                   ;; Move back over whitespace before the openbrace.
                   ;; If openbrace is not first nonwhite thing on the line,
                   ;; add the cperl-brace-imaginary-offset.
                   (progn (skip-chars-backward " \t")
                          (if (bolp) 0 cperl-brace-imaginary-offset))
                   ;; If the openbrace is preceded by a parenthesized exp,
                   ;; move to the beginning of that;
                   ;; possibly a different line
                   (progn
                     (if (eq (preceding-char) ?\))
                         (forward-sexp -1))
                     ;; Get initial indentation of the line we are on.
                     ;; If line starts with label, calculate label indentation
                     (if (save-excursion
                           (beginning-of-line)
                           (looking-at "[ \t]*[a-zA-Z_][a-zA-Z_]*:[^:]"))
                         (if (> (current-indentation) cperl-min-label-indent)
                             (- (current-indentation) cperl-label-offset)
                           (cperl-calculate-indent 
                            (if (and parse-start (<= parse-start (point)))
                                parse-start)))
                       (current-indentation))))))))
      res)))

(defun cperl-calculate-indent-within-comment ()
  "Return the indentation amount for line, assuming that
the current line is to be regarded as part of a block comment."
  (let (end star-start)
    (save-excursion
      (beginning-of-line)
      (skip-chars-forward " \t")
      (setq end (point))
      (and (= (following-char) ?#)
           (forward-line -1)
           (cperl-to-comment-or-eol)
           (setq end (point)))
      (goto-char end)
      (current-column))))


(defun cperl-to-comment-or-eol ()
  "Goes to position before comment on the current line, or to end of line.
Returns true if comment is found."
  (let (state stop-in cpoint (lim (progn (end-of-line) (point))))
      (beginning-of-line)
      (if (re-search-forward "\\=[ \t]*\\(#\\|$\\)" lim t) 
          (if (eq (preceding-char) ?\#) (progn (backward-char 1) t))
        ;; Else
        (while (not stop-in)
          (setq state (parse-partial-sexp (point) lim nil nil nil t))
                                        ; stop at comment
          ;; If fails (beginning-of-line inside sexp), then contains not-comment
          ;; Do simplified processing
          ;;(if (re-search-forward "[^$]#" lim 1)
          ;;      (progn
          ;;    (forward-char -1)
          ;;    (skip-chars-backward " \t\n\f" lim))
          ;;    (goto-char lim))                ; No `#' at all
          ;;)
          (if (nth 4 state)             ; After `#';
                                        ; (nth 2 state) can be
                                        ; beginning of m,s,qq and so
                                        ; on
              (if (nth 2 state)
                  (progn
                    (setq cpoint (point))
                    (goto-char (nth 2 state))
                    (cond
                     ((looking-at "\\(s\\|tr\\)\\>")
                      (or (re-search-forward
                           "\\=\\w+[ \t]*#\\([^\n\\\\#]\\|\\\\[\\\\#]\\)*#\\([^\n\\\\#]\\|\\\\[\\\\#]\\)*"
                           lim 'move)
                          (setq stop-in t)))
                     ((looking-at "\\(m\\|q\\([qxw]\\)?\\)\\>")
                      (or (re-search-forward
                           "\\=\\w+[ \t]*#\\([^\n\\\\#]\\|\\\\[\\\\#]\\)*#"
                           lim 'move)
                          (setq stop-in t)))
                     (t                 ; It was fair comment
                      (setq stop-in t)  ; Finish
                      (goto-char (1- cpoint)))))
                (setq stop-in t)        ; Finish
                (forward-char -1))
            (setq stop-in t))           ; Finish
          )
        (nth 4 state))))

(defun cperl-find-pods-heres (&optional min max)
  "Scans the buffer for POD sections and here-documents.
If `cperl-pod-here-fontify' is not-nil after evaluation, will fontify 
the sections using `cperl-pod-head-face', `cperl-pod-face', 
`cperl-here-face'."
  (interactive)
  (or min (setq min (point-min)))
  (or max (setq max (point-max)))
  (let (face head-face here-face b e bb tag qtag err b1 e1 argument
             (cperl-pod-here-fontify (eval cperl-pod-here-fontify))
             (case-fold-search nil) (inhibit-read-only t) (buffer-undo-list t)
             (modified (buffer-modified-p))
             (after-change-functions nil)
             (search
              (concat
               "\\(\\`\n?\\|\n\n\\)=" 
               "\\|"
               ;; One extra () before this:
               "<<" 
                 "\\(" 
                 ;; First variant "BLAH" or just ``.
                    "\\([\"'`]\\)"
                    "\\([^\"'`\n]*\\)"
                    "\\3"
                 "\\|"
                 ;; Second variant: Identifier or empty
                   "\\(\\([a-zA-Z_][a-zA-Z_0-9]*\\)?\\)"
                   ;; Check that we do not have <<= or << 30 or << $blah.
                   "\\([^= \t$@%&]\\|[ \t]+[^ \t\n0-9$@%&]\\)"
                 "\\)"
               "\\|"
               ;; 1+6 extra () before this:
               "^[ \t]*format[ \t]*\\([a-zA-Z0-9_]+\\)?[ \t]*=[ \t]*$")))
    (unwind-protect
        (progn
          (save-excursion
            (message "Scanning for pods, formats and here-docs...")
            (if cperl-pod-here-fontify
                ;; We had evals here, do not know why...
                (setq face cperl-pod-face
                      head-face cperl-pod-head-face
                      here-face cperl-here-face))
            (remove-text-properties min max '(syntax-type t))
            ;; Need to remove face as well...
            (goto-char min)
            (while (re-search-forward search max t)
              (cond 
               ((match-beginning 1)     ; POD section
                ;;  "\\(\\`\n?\\|\n\n\\)=" 
                (if (looking-at "\n*cut\\>")
                    (progn
                      (message "=cut is not preceeded by a pod section")
                      (setq err (point)))
                  (beginning-of-line)
                
                  (setq b (point) bb b)
                  (or (re-search-forward "\n\n=cut\\>" max 'toend)
                      (message "Cannot find the end of a pod section"))
                  (beginning-of-line 3)
                  (setq e (point))
                  (put-text-property b e 'in-pod t)
                  (goto-char b)
                  (while (re-search-forward "\n\n[ \t]" e t)
                    (beginning-of-line)
                    (put-text-property b (point) 'syntax-type 'pod)
                    (cperl-put-do-not-fontify b (point))
                    ;;(put-text-property (max (point-min) (1- b))
                    ;;               (point) cperl-do-not-fontify t)
                    (if cperl-pod-here-fontify (put-text-property b (point) 'face face))
                    (re-search-forward "\n\n[^ \t\f\n]" e 'toend)
                    (beginning-of-line)
                    (setq b (point)))
                  (put-text-property (point) e 'syntax-type 'pod)
                  (cperl-put-do-not-fontify (point) e)
                  ;;(put-text-property (max (point-min) (1- (point)))
                  ;;               e cperl-do-not-fontify t)
                  (if cperl-pod-here-fontify 
                      (progn (put-text-property (point) e 'face face)
                             (goto-char bb)
                             (if (looking-at 
                                  "=[a-zA-Z0-9]+\\>[ \t]*\\(\\(\n?[^\n]\\)+\\)$")
                                 (put-text-property 
                                  (match-beginning 1) (match-end 1)
                                  'face head-face))
                             (while (re-search-forward
                                     ;; One paragraph
                                     "\n\n=[a-zA-Z0-9]+\\>[ \t]*\\(\\(\n?[^\n]\\)+\\)$"
                                     e 'toend)
                               (put-text-property 
                                (match-beginning 1) (match-end 1)
                                'face head-face))))
                  (goto-char e)))
               ;; Here document
               ;; 1 () ahead
               ;; "<<\\(\\([\"'`]\\)\\([^\"'`\n]*\\)\\3\\|\\(\\([a-zA-Z_][a-zA-Z_0-9]*\\)?\\)\\)"
               ((match-beginning 2)     ; 1 + 1
                ;; Abort in comment (_extremely_ simplified):
                (setq b (point))
                (if (save-excursion
                      (beginning-of-line)
                      (search-forward "#" b t))
                    nil
                  (if (match-beginning 5) ;4 + 1
                      (setq b1 (match-beginning 5) ; 4 + 1
                            e1 (match-end 5)) ; 4 + 1
                    (setq b1 (match-beginning 4) ; 3 + 1
                          e1 (match-end 4))) ; 3 + 1
                  (setq tag (buffer-substring b1 e1)
                        qtag (regexp-quote tag))
                  (cond (cperl-pod-here-fontify 
                         (put-text-property b1 e1 'face font-lock-reference-face)
                         (cperl-put-do-not-fontify b1 e1)))
                  (forward-line)
                  (setq b (point))
                  (cond ((re-search-forward (concat "^" qtag "$") max 'toend)
                         (if cperl-pod-here-fontify 
                             (progn
                               (put-text-property (match-beginning 0) (match-end 0) 
                                                  'face font-lock-reference-face)
                               (cperl-put-do-not-fontify b (match-end 0))
                               ;;(put-text-property (max (point-min) (1- b))
                               ;;                     (min (point-max)
                               ;;                          (1+ (match-end 0)))
                               ;;                     cperl-do-not-fontify t)
                               (put-text-property b (match-beginning 0) 
                                                  'face here-face)))
                         (put-text-property b (match-beginning 0) 
                                            'syntax-type 'here-doc)
                         (cperl-put-do-not-fontify b (match-beginning 0)))
                        (t (message "End of here-document `%s' not found." tag)))))
               ;; format
               (t
                ;; 1+6=7 extra () before this:
                ;; "^[ \t]*format[ \t]*\\([a-zA-Z0-9_]+\\)?[ \t]*=[ \t]*$")))
                (setq b (point)
                      name (if (match-beginning 8) ; 7 + 1
                               (buffer-substring (match-beginning 8) ; 7 + 1
                                                 (match-end 8)) ; 7 + 1
                             ""))
                (setq argument nil)
                (if cperl-pod-here-fontify 
                    (while (and (eq (forward-line) 0)
                                (not (looking-at "^[.;]$")))
                      (cond
                       ((looking-at "^#")) ; Skip comments
                       ((and argument   ; Skip argument multi-lines
                             (looking-at "^[ \t]*{")) 
                        (forward-sexp 1)
                        (setq argument nil))
                       (argument        ; Skip argument lines
                        (setq argument nil))
                       (t               ; Format line
                        (setq b1 (point))
                        (setq argument (looking-at "^[^\n]*[@^]"))
                        (end-of-line)
                        (put-text-property b1 (point) 
                                           'face font-lock-string-face)
                        (cperl-put-do-not-fontify b1 (point)))))
                  (re-search-forward (concat "^[.;]$") max 'toend))
                (beginning-of-line)
                (if (looking-at "^[.;]$")
                    (progn
                      (put-text-property (point) (+ (point) 2)
                                         'face font-lock-string-face)
                      (cperl-put-do-not-fontify (point) (+ (point) 2)))
                  (message "End of format `%s' not found." name))
                (forward-line)
                (put-text-property b (point) 'syntax-type 'format)
;;;            (cond ((re-search-forward (concat "^[.;]$") max 'toend)
;;;                   (if cperl-pod-here-fontify 
;;;                       (progn
;;;                         (put-text-property b (match-end 0)
;;;                                            'face font-lock-string-face)
;;;                         (cperl-put-do-not-fontify b (match-end 0))))
;;;                   (put-text-property b (match-end 0) 
;;;                                      'syntax-type 'format)
;;;                   (cperl-put-do-not-fontify b (match-beginning 0)))
;;;                  (t (message "End of format `%s' not found." name)))
                )))
;;;         (while (re-search-forward "\\(\\`\n?\\|\n\n\\)=" max t)
;;;           (if (looking-at "\n*cut\\>")
;;;               (progn
;;;                 (message "=cut is not preceeded by a pod section")
;;;                 (setq err (point)))
;;;             (beginning-of-line)
                
;;;             (setq b (point) bb b)
;;;             (or (re-search-forward "\n\n=cut\\>" max 'toend)
;;;                 (message "Cannot find the end of a pod section"))
;;;             (beginning-of-line 3)
;;;             (setq e (point))
;;;             (put-text-property b e 'in-pod t)
;;;             (goto-char b)
;;;             (while (re-search-forward "\n\n[ \t]" e t)
;;;               (beginning-of-line)
;;;               (put-text-property b (point) 'syntax-type 'pod)
;;;               (cperl-put-do-not-fontify b (point))
;;;               ;;(put-text-property (max (point-min) (1- b))
;;;               ;;                 (point) cperl-do-not-fontify t)
;;;               (if cperl-pod-here-fontify (put-text-property b (point) 'face face))
;;;               (re-search-forward "\n\n[^ \t\f\n]" e 'toend)
;;;               (beginning-of-line)
;;;               (setq b (point)))
;;;             (put-text-property (point) e 'syntax-type 'pod)
;;;             (cperl-put-do-not-fontify (point) e)
;;;             ;;(put-text-property (max (point-min) (1- (point)))
;;;             ;;                 e cperl-do-not-fontify t)
;;;             (if cperl-pod-here-fontify 
;;;                 (progn (put-text-property (point) e 'face face)
;;;                        (goto-char bb)
;;;                        (if (looking-at 
;;;                         "=[a-zA-Z0-9]+\\>[ \t]*\\(\\(\n?[^\n]\\)+\\)$")
;;;                            (put-text-property 
;;;                             (match-beginning 1) (match-end 1)
;;;                             'face head-face))
;;;                        (while (re-search-forward
;;;                                ;; One paragraph
;;;                                "\n\n=[a-zA-Z0-9]+\\>[ \t]*\\(\\(\n?[^\n]\\)+\\)$"
;;;                                e 'toend)
;;;                          (put-text-property 
;;;                           (match-beginning 1) (match-end 1)
;;;                           'face head-face))))
;;;             (goto-char e)))
;;;         (goto-char min)
;;;         (while (re-search-forward 
;;;                 ;; We exclude \n to avoid misrecognition inside quotes.
;;;                 "<<\\(\\([\"'`]\\)\\([^\"'`\n]*\\)\\2\\|\\(\\([a-zA-Z_][a-zA-Z_0-9]*\\)?\\)\\)"
;;;                 max t)
;;;           (if (match-beginning 4)
;;;               (setq b1 (match-beginning 4)
;;;                     e1 (match-end 4))
;;;             (setq b1 (match-beginning 3)
;;;                   e1 (match-end 3)))
;;;           (setq tag (buffer-substring b1 e1)
;;;                 qtag (regexp-quote tag))
;;;           (cond (cperl-pod-here-fontify 
;;;                  (put-text-property b1 e1 'face font-lock-reference-face)
;;;                  (cperl-put-do-not-fontify b1 e1)))
;;;           (forward-line)
;;;           (setq b (point))
;;;           (cond ((re-search-forward (concat "^" qtag "$") max 'toend)
;;;                  (if cperl-pod-here-fontify 
;;;                      (progn
;;;                        (put-text-property (match-beginning 0) (match-end 0) 
;;;                                           'face font-lock-reference-face)
;;;                        (cperl-put-do-not-fontify b (match-end 0))
;;;                        ;;(put-text-property (max (point-min) (1- b))
;;;                        ;;                 (min (point-max)
;;;                        ;;                      (1+ (match-end 0)))
;;;                        ;;                 cperl-do-not-fontify t)
;;;                        (put-text-property b (match-beginning 0) 
;;;                                           'face here-face)))
;;;                  (put-text-property b (match-beginning 0) 
;;;                                     'syntax-type 'here-doc)
;;;                  (cperl-put-do-not-fontify b (match-beginning 0)))
;;;                 (t (message "End of here-document `%s' not found." tag))))
;;;         (goto-char min)
;;;         (while (re-search-forward 
;;;                 "^[ \t]*format[ \t]*\\(\\([a-zA-Z0-9_]+[ \t]*\\)?\\)=[ \t]*$"
;;;                 max t)
;;;           (setq b (point)
;;;                 name (buffer-substring (match-beginning 1)
;;;                                        (match-end 1)))
;;;           (cond ((re-search-forward (concat "^[.;]$") max 'toend)
;;;                  (if cperl-pod-here-fontify 
;;;                      (progn
;;;                        (put-text-property b (match-end 0)
;;;                                           'face font-lock-string-face)
;;;                        (cperl-put-do-not-fontify b (match-end 0))))
;;;                  (put-text-property b (match-end 0) 
;;;                                     'syntax-type 'format)
;;;                  (cperl-put-do-not-fontify b (match-beginning 0)))
;;;                 (t (message "End of format `%s' not found." name))))
)
          (if err (goto-char err)
            (message "Scan for pods, formats and here-docs completed.")))
      (and (buffer-modified-p)
           (not modified)
           (set-buffer-modified-p nil)))))

(defun cperl-backward-to-noncomment (lim)
  ;; Stops at lim or after non-whitespace that is not in comment
  (let (stop p)
    (while (and (not stop) (> (point) (or lim 1)))
      (skip-chars-backward " \t\n\f" lim)
      (setq p (point))
      (beginning-of-line)
      (if (looking-at "^[ \t]*\\(#\\|$\\)") nil ; Only comment, skip
        ;; Else
        (cperl-to-comment-or-eol) 
        (skip-chars-backward " \t")
        (if (< p (point)) (goto-char p))
        (setq stop t)))))

(defun cperl-after-expr-p (&optional lim chars test)
  "Returns true if the position is good for start of expression.
TEST is the expression to evaluate at the found position. If absent,
CHARS is a string that contains good characters to have before us."
  (let (stop p)
    (save-excursion
      (while (and (not stop) (> (point) (or lim 1)))
        (skip-chars-backward " \t\n\f" lim)
        (setq p (point))
        (beginning-of-line)
        (if (looking-at "^[ \t]*\\(#\\|$\\)") nil ; Only comment, skip
          ;; Else: last iteration (What to do with labels?)
          (cperl-to-comment-or-eol) 
          (skip-chars-backward " \t")
          (if (< p (point)) (goto-char p))
          (setq stop t)))
      (or (bobp)
          (progn
            (backward-char 1)
            (if test (eval test)
              (memq (following-char) (append (or chars "{};") nil))))))))

(defun cperl-backward-to-start-of-continued-exp (lim)
  (if (memq (preceding-char) (append ")]}\"'`" nil))
      (forward-sexp -1))
  (beginning-of-line)
  (if (<= (point) lim)
      (goto-char (1+ lim)))
  (skip-chars-forward " \t"))

\f
(defvar innerloop-done nil)
(defvar last-depth nil)

(defun cperl-indent-exp ()
  "Simple variant of indentation of continued-sexp.
Should be slow. Will not indent comment if it starts at `comment-indent'
or looks like continuation of the comment on the previous line."
  (interactive)
  (save-excursion
    (let ((tmp-end (progn (end-of-line) (point))) top done)
      (save-excursion
        (while (null done)
          (beginning-of-line)
          (setq top (point))
          (while (= (nth 0 (parse-partial-sexp (point) tmp-end
                                               -1)) -1)
            (setq top (point)))         ; Get the outermost parenths in line
          (goto-char top)
          (while (< (point) tmp-end)
            (parse-partial-sexp (point) tmp-end nil t) ; To start-sexp or eol
            (or (eolp) (forward-sexp 1)))
          (if (> (point) tmp-end) (progn (end-of-line) (setq tmp-end (point)))
            (setq done t)))
        (goto-char tmp-end)
        (setq tmp-end (point-marker)))
      (cperl-indent-region (point) tmp-end))))

(defun cperl-indent-region (start end)
  "Simple variant of indentation of region in CPerl mode.
Should be slow. Will not indent comment if it starts at `comment-indent' 
or looks like continuation of the comment on the previous line.
Indents all the lines whose first character is between START and END 
inclusive."
  (interactive "r")
  (save-excursion
    (let (st comm indent-info old-comm-indent new-comm-indent 
             (pm 0) (imenu-scanning-message "Indenting... (%3d%%)"))
      (goto-char start)
      (setq old-comm-indent (and (cperl-to-comment-or-eol)
                                 (current-column))
            new-comm-indent old-comm-indent)
      (goto-char start)
      (or (bolp) (beginning-of-line 2))
      (or (fboundp 'imenu-progress-message)
          (message "Indenting... For feedback load `imenu'..."))
      (while (and (<= (point) end) (not (eobp))) ; bol to check start
        (and (fboundp 'imenu-progress-message)
             (imenu-progress-message 
              pm (/ (* 100 (- (point) start)) (- end start -1))))
        (setq st (point) 
              indent-info nil
              ) ; Believe indentation of the current
        (if (and (setq comm (looking-at "[ \t]*#"))
                 (or (eq (current-indentation) (or old-comm-indent 
                                                   comment-column))
                     (setq old-comm-indent nil)))
            (if (and old-comm-indent
                     (= (current-indentation) old-comm-indent))
                (let ((comment-column new-comm-indent))
                  (indent-for-comment)))
          (progn 
            (cperl-indent-line 'indent-info)
            (or comm
                (progn
                  (if (setq old-comm-indent (and (cperl-to-comment-or-eol)
                                                 (current-column)))
                      (progn (indent-for-comment)
                             (skip-chars-backward " \t")
                             (skip-chars-backward "#")
                             (setq new-comm-indent (current-column))))))))
        (beginning-of-line 2))
        (if (fboundp 'imenu-progress-message)
             (imenu-progress-message pm 100)
          (message nil)))))

(defun cperl-slash-is-regexp (&optional pos)
  (save-excursion
    (goto-char (if pos pos (1- (point))))
    (and
     (not (memq (get-text-property (point) 'face)
                '(font-lock-string-face font-lock-comment-face)))
     (cperl-after-expr-p nil nil '
                       (or (looking-at "[^]a-zA-Z0-9_)}]")
                           (eq (get-text-property (point) 'face)
                               'font-lock-keyword-face))))))

;; Stolen from lisp-mode with a lot of improvements

(defun cperl-fill-paragraph (&optional justify iteration)
  "Like \\[fill-paragraph], but handle CPerl comments.
If any of the current line is a comment, fill the comment or the
block of it that point is in, preserving the comment's initial
indentation and initial hashes. Behaves usually outside of comment."
  (interactive "P")
  (let (
        ;; Non-nil if the current line contains a comment.
        has-comment

        ;; If has-comment, the appropriate fill-prefix for the comment.
        comment-fill-prefix
        ;; Line that contains code and comment (or nil)
        start
        c spaces len dc (comment-column comment-column))
    ;; Figure out what kind of comment we are looking at.
    (save-excursion
      (beginning-of-line)
      (cond

       ;; A line with nothing but a comment on it?
       ((looking-at "[ \t]*#[# \t]*")
        (setq has-comment t
              comment-fill-prefix (buffer-substring (match-beginning 0)
                                                    (match-end 0))))

       ;; A line with some code, followed by a comment?  Remember that the
       ;; semi which starts the comment shouldn't be part of a string or
       ;; character.
       ((cperl-to-comment-or-eol)
        (setq has-comment t)
        (looking-at "#+[ \t]*")
        (setq start (point) c (current-column) 
              comment-fill-prefix
              (concat (make-string (current-column) ?\ )
                      (buffer-substring (match-beginning 0) (match-end 0)))
              spaces (progn (skip-chars-backward " \t") 
                            (buffer-substring (point) start))
              dc (- c (current-column)) len (- start (point)) 
              start (point-marker))
        (delete-char len)
        (insert (make-string dc ?-)))))
    (if (not has-comment)
        (fill-paragraph justify)        ; Do the usual thing outside of comment
      ;; Narrow to include only the comment, and then fill the region.
      (save-restriction
        (narrow-to-region
         ;; Find the first line we should include in the region to fill.
         (if start (progn (beginning-of-line) (point))
           (save-excursion
             (while (and (zerop (forward-line -1))
                         (looking-at "^[ \t]*#+[ \t]*[^ \t\n#]")))
             ;; We may have gone to far.  Go forward again.
             (or (looking-at "^[ \t]*#+[ \t]*[^ \t\n#]")
                 (forward-line 1))
             (point)))
         ;; Find the beginning of the first line past the region to fill.
         (save-excursion
           (while (progn (forward-line 1)
                         (looking-at "^[ \t]*#+[ \t]*[^ \t\n#]")))
           (point)))
        ;; Remove existing hashes
        (goto-char (point-min))
        (while (progn (forward-line 1) (< (point) (point-max)))
          (skip-chars-forward " \t")
          (and (looking-at "#+") 
               (delete-char (- (match-end 0) (match-beginning 0)))))

        ;; Lines with only hashes on them can be paragraph boundaries.
        (let ((paragraph-start (concat paragraph-start "\\|^[ \t#]*$"))
              (paragraph-separate (concat paragraph-start "\\|^[ \t#]*$"))
              (fill-prefix comment-fill-prefix))
          (fill-paragraph justify)))
      (if (and start)
          (progn 
            (goto-char start)
            (if (> dc 0)
              (progn (delete-char dc) (insert spaces)))
            (if (or (= (current-column) c) iteration) nil
              (setq comment-column c)
              (indent-for-comment)
              ;; Repeat once more, flagging as iteration
              (cperl-fill-paragraph justify t)))))))

(defun cperl-do-auto-fill ()
  ;; Break out if the line is short enough
  (if (> (save-excursion
           (end-of-line)
           (current-column))
         fill-column)
  (let ((c (save-excursion (beginning-of-line)
                           (cperl-to-comment-or-eol) (point)))
        (s (memq (following-char) '(?\ ?\t))) marker)
    (if (>= c (point)) nil
      (setq marker (point-marker))
      (cperl-fill-paragraph)
      (goto-char marker)
      ;; Is not enough, sometimes marker is a start of line
      (if (bolp) (progn (re-search-forward "#+[ \t]*") 
                        (goto-char (match-end 0))))
      ;; Following space could have gone:
      (if (or (not s) (memq (following-char) '(?\ ?\t))) nil
        (insert " ")
        (backward-char 1))
      ;; Previous space could have gone:
      (or (memq (preceding-char) '(?\ ?\t)) (insert " "))))))

(defvar imenu-example--function-name-regexp-perl
      "^\\([ \t]*\\(sub\\|package\\)[ \t\n]+\\([a-zA-Z_0-9:']+\\)[ \t]*\\|=head\\([12]\\)[ \t]+\\([^\n]+\\)$\\)")

(defun cperl-imenu-addback (lst &optional isback name)
  ;; We suppose that the lst is a DAG, unless the first element only
  ;; loops back, and ISBACK is set. Thus this function cannot be
  ;; applied twice without ISBACK set.
  (cond ((not cperl-imenu-addback) lst)
        (t
         (or name 
             (setq name "+++BACK+++"))
         (mapcar (function (lambda (elt)
                             (if (and (listp elt) (listp (cdr elt)))
                                 (progn
                                   ;; In the other order it goes up
                                   ;; one level only ;-(
                                   (setcdr elt (cons (cons name lst)
                                                     (cdr elt)))
                                   (cperl-imenu-addback (cdr elt) t name)
                                   ))))
                 (if isback (cdr lst) lst))
         lst)))

(defun imenu-example--create-perl-index (&optional regexp)
  (require 'cl)
  (let ((index-alist '()) (index-pack-alist '()) (index-pod-alist '()) 
        (index-unsorted-alist '()) (i-s-f (default-value 'imenu-sort-function))
        (index-meth-alist '()) meth
        packages ends-ranges p
        (prev-pos 0) char fchar index index1 name (end-range 0) package)
    (goto-char (point-min))
    (imenu-progress-message prev-pos 0)
    ;; Search for the function
    (progn ;;save-match-data
      (while (re-search-forward
              (or regexp imenu-example--function-name-regexp-perl)
              nil t)
        (imenu-progress-message prev-pos)
        ;;(backward-up-list 1)
        (cond
         ((match-beginning 2)           ; package or sub
          (save-excursion
            (goto-char (match-beginning 2))
            (setq fchar (following-char))
            )
          (setq char (following-char) meth nil)
          (setq p (point))
          (while (and ends-ranges (>= p (car ends-ranges)))
            ;; delete obsolete entries
            (setq ends-ranges (cdr ends-ranges) packages (cdr packages)))
          (setq package (or (car packages) "")
                end-range (or (car ends-ranges) 0))
          (if (eq fchar ?p)
              (setq name (buffer-substring (match-beginning 3) (match-end 3))
                    name (progn
                           (set-text-properties 0 (length name) nil name)
                           name)
                    package (concat name "::") 
                    name (concat "package " name)
                    end-range 
                    (save-excursion
                      (parse-partial-sexp (point) (point-max) -1) (point))
                    ends-ranges (cons end-range ends-ranges)
                    packages (cons package packages)))
          ;;   )
          ;; Skip this function name if it is a prototype declaration.
          (if (and (eq fchar ?s) (eq char ?\;)) nil
            (setq index (imenu-example--name-and-position))
            (if (eq fchar ?p) nil
              (setq name (buffer-substring (match-beginning 3) (match-end 3)))
              (set-text-properties 0 (length name) nil name)
              (cond ((string-match "[:']" name)
                     (setq meth t))
                    ((> p end-range) nil)
                    (t 
                     (setq name (concat package name) meth t))))
            (setcar index name)
            (if (eq fchar ?p) 
                (push index index-pack-alist)
              (push index index-alist))
            (if meth (push index index-meth-alist))
            (push index index-unsorted-alist)))
         (t                             ; Pod section
          ;; (beginning-of-line)
          (setq index (imenu-example--name-and-position)
                name (buffer-substring (match-beginning 5) (match-end 5)))
          (set-text-properties 0 (length name) nil name)
          (if (eq (char-after (match-beginning 4)) ?2)
              (setq name (concat "   " name)))
          (setcar index name)
          (setq index1 (cons (concat "=" name) (cdr index)))
          (push index index-pod-alist)
          (push index1 index-unsorted-alist)))))
    (imenu-progress-message prev-pos 100)
    (setq index-alist 
          (if (default-value 'imenu-sort-function)
              (sort index-alist (default-value 'imenu-sort-function))
              (nreverse index-alist)))
    (and index-pod-alist
         (push (cons "+POD headers+..."
                     (nreverse index-pod-alist))
               index-alist))
    (and (or index-pack-alist index-meth-alist)
         (let ((lst index-pack-alist) hier-list pack elt group name)
           ;; Remove "package ", reverse and uniquify.
           (while lst
             (setq elt (car lst) lst (cdr lst) name (substring (car elt) 8))
             (if (assoc name hier-list) nil
               (setq hier-list (cons (cons name (cdr elt)) hier-list))))
           (setq lst index-meth-alist)
           (while lst
             (setq elt (car lst) lst (cdr lst))
             (cond ((string-match "\\(::\\|'\\)[_a-zA-Z0-9]+$" (car elt))
                    (setq pack (substring (car elt) 0 (match-beginning 0)))
                    (if (setq group (assoc pack hier-list)) 
                        (if (listp (cdr group))
                            ;; Have some functions already
                            (setcdr group 
                                    (cons (cons (substring 
                                                 (car elt)
                                                 (+ 2 (match-beginning 0)))
                                                (cdr elt))
                                          (cdr group)))
                          (setcdr group (list (cons (substring 
                                                     (car elt)
                                                     (+ 2 (match-beginning 0)))
                                                    (cdr elt)))))
                      (setq hier-list 
                            (cons (cons pack 
                                        (list (cons (substring 
                                                     (car elt)
                                                     (+ 2 (match-beginning 0)))
                                                    (cdr elt))))
                                  hier-list))))))
           (push (cons "+Hierarchy+..."
                       hier-list)
                 index-alist)))
    (and index-pack-alist
         (push (cons "+Packages+..."
                     (nreverse index-pack-alist))
               index-alist))
    (and (or index-pack-alist index-pod-alist 
             (default-value 'imenu-sort-function))
         index-unsorted-alist
         (push (cons "+Unsorted List+..."
                     (nreverse index-unsorted-alist))
               index-alist))
    (cperl-imenu-addback index-alist)))

(defvar cperl-compilation-error-regexp-alist 
  ;; This look like a paranoiac regexp: could anybody find a better one? (which WORK).
  '(("^[^\n]* \\(file\\|at\\) \\([^ \t\n]+\\) [^\n]*line \\([0-9]+\\)[\\., \n]"
     2 3))
  "Alist that specifies how to match errors in perl output.")

(if (fboundp 'eval-after-load)
    (eval-after-load
     "mode-compile"
     '(setq perl-compilation-error-regexp-alist
           cperl-compilation-error-regexp-alist)))


(defvar cperl-faces-init nil)

(defun cperl-windowed-init ()
  "Initialization under windowed version."
  (add-hook 'font-lock-mode-hook
            (function
             (lambda ()
               (if (or
                    (eq major-mode 'perl-mode)
                    (eq major-mode 'cperl-mode))
                   (progn
                     (or cperl-faces-init (cperl-init-faces))))))))

(defvar perl-font-lock-keywords-1 nil
  "Additional expressions to highlight in Perl mode. Minimal set.")
(defvar perl-font-lock-keywords nil
  "Additional expressions to highlight in Perl mode. Default set.")
(defvar perl-font-lock-keywords-2 nil
  "Additional expressions to highlight in Perl mode. Maximal set")

(defun cperl-init-faces ()
  (condition-case nil
      (progn
        (require 'font-lock)
        (and (fboundp 'font-lock-fontify-anchored-keywords)
             (featurep 'font-lock-extra)
             (message "You have an obsolete package `font-lock-extra'. Install `choose-color'."))
        (let (t-font-lock-keywords t-font-lock-keywords-1 font-lock-anchored)
          ;;(defvar cperl-font-lock-enhanced nil
          ;;  "Set to be non-nil if font-lock allows active highlights.")
          (if (fboundp 'font-lock-fontify-anchored-keywords)
              (setq font-lock-anchored t))
          (setq 
           t-font-lock-keywords
           (list
            (cons
             (concat
              "\\(^\\|[^$@%&\\]\\)\\<\\("
              (mapconcat
               'identity
               '("if" "until" "while" "elsif" "else" "unless" "for"
                 "foreach" "continue" "exit" "die" "last" "goto" "next"
                 "redo" "return" "local" "exec" "sub" "do" "dump" "use"
                 "require" "package" "eval" "my" "BEGIN" "END")
               "\\|")                   ; Flow control
              "\\)\\>") 2)              ; was "\\)[ \n\t;():,\|&]"
                                        ; In what follows we use `type' style
                                        ; for overwritable builtins
            (list
             (concat
              "\\(^\\|[^$@%&\\]\\)\\<\\("
              ;; "CORE" "__FILE__" "__LINE__" "abs" "accept" "alarm"
              ;; "and" "atan2" "bind" "binmode" "bless" "caller"
              ;; "chdir" "chmod" "chown" "chr" "chroot" "close"
              ;; "closedir" "cmp" "connect" "continue" "cos" "crypt"
              ;; "dbmclose" "dbmopen" "die" "dump" "endgrent"
              ;; "endhostent" "endnetent" "endprotoent" "endpwent"
              ;; "endservent" "eof" "eq" "exec" "exit" "exp" "fcntl"
              ;; "fileno" "flock" "fork" "formline" "ge" "getc"
              ;; "getgrent" "getgrgid" "getgrnam" "gethostbyaddr"
              ;; "gethostbyname" "gethostent" "getlogin"
              ;; "getnetbyaddr" "getnetbyname" "getnetent"
              ;; "getpeername" "getpgrp" "getppid" "getpriority"
              ;; "getprotobyname" "getprotobynumber" "getprotoent"
              ;; "getpwent" "getpwnam" "getpwuid" "getservbyname"
              ;; "getservbyport" "getservent" "getsockname"
              ;; "getsockopt" "glob" "gmtime" "gt" "hex" "index" "int"
              ;; "ioctl" "join" "kill" "lc" "lcfirst" "le" "length"
              ;; "link" "listen" "localtime" "log" "lstat" "lt"
              ;; "mkdir" "msgctl" "msgget" "msgrcv" "msgsnd" "ne"
              ;; "not" "oct" "open" "opendir" "or" "ord" "pack" "pipe"
              ;; "quotemeta" "rand" "read" "readdir" "readline"
              ;; "readlink" "readpipe" "recv" "ref" "rename" "require"
              ;; "reset" "reverse" "rewinddir" "rindex" "rmdir" "seek"
              ;; "seekdir" "select" "semctl" "semget" "semop" "send"
              ;; "setgrent" "sethostent" "setnetent" "setpgrp"
              ;; "setpriority" "setprotoent" "setpwent" "setservent"
              ;; "setsockopt" "shmctl" "shmget" "shmread" "shmwrite"
              ;; "shutdown" "sin" "sleep" "socket" "socketpair"
              ;; "sprintf" "sqrt" "srand" "stat" "substr" "symlink"
              ;; "syscall" "sysread" "system" "syswrite" "tell"
              ;; "telldir" "time" "times" "truncate" "uc" "ucfirst"
              ;; "umask" "unlink" "unpack" "utime" "values" "vec"
              ;; "wait" "waitpid" "wantarray" "warn" "write" "x" "xor"
              "a\\(bs\\|ccept\\|tan2\\|larm\\|nd\\)\\|" 
              "b\\(in\\(d\\|mode\\)\\|less\\)\\|"
              "c\\(h\\(r\\(\\|oot\\)\\|dir\\|mod\\|own\\)\\|aller\\|rypt\\|"
              "lose\\(\\|dir\\)\\|mp\\|o\\(s\\|n\\(tinue\\|nect\\)\\)\\)\\|"
              "CORE\\|d\\(ie\\|bm\\(close\\|open\\)\\|ump\\)\\|"
              "e\\(x\\(p\\|it\\|ec\\)\\|q\\|nd\\(p\\(rotoent\\|went\\)\\|"
              "hostent\\|servent\\|netent\\|grent\\)\\|of\\)\\|"
              "f\\(ileno\\|cntl\\|lock\\|or\\(k\\|mline\\)\\)\\|"
              "g\\(t\\|lob\\|mtime\\|e\\(\\|t\\(p\\(pid\\|r\\(iority\\|"
              "oto\\(byn\\(ame\\|umber\\)\\|ent\\)\\)\\|eername\\|w"
              "\\(uid\\|ent\\|nam\\)\\|grp\\)\\|host\\(by\\(addr\\|name\\)\\|"
              "ent\\)\\|s\\(erv\\(by\\(port\\|name\\)\\|ent\\)\\|"
              "ock\\(name\\|opt\\)\\)\\|c\\|login\\|net\\(by\\(addr\\|name\\)\\|"
              "ent\\)\\|gr\\(ent\\|nam\\|gid\\)\\)\\)\\)\\|"
              "hex\\|i\\(n\\(t\\|dex\\)\\|octl\\)\\|join\\|kill\\|"
              "l\\(i\\(sten\\|nk\\)\\|stat\\|c\\(\\|first\\)\\|t\\|e"
              "\\(\\|ngth\\)\\|o\\(caltime\\|g\\)\\)\\|m\\(sg\\(rcv\\|snd\\|"
              "ctl\\|get\\)\\|kdir\\)\\|n\\(e\\|ot\\)\\|o\\(pen\\(\\|dir\\)\\|"
              "r\\(\\|d\\)\\|ct\\)\\|p\\(ipe\\|ack\\)\\|quotemeta\\|"
              "r\\(index\\|and\\|mdir\\|e\\(quire\\|ad\\(pipe\\|\\|lin"
              "\\(k\\|e\\)\\|dir\\)\\|set\\|cv\\|verse\\|f\\|winddir\\|name"
              "\\)\\)\\|s\\(printf\\|qrt\\|rand\\|tat\\|ubstr\\|e\\(t\\(p\\(r"
              "\\(iority\\|otoent\\)\\|went\\|grp\\)\\|hostent\\|s\\(ervent\\|"
              "ockopt\\)\\|netent\\|grent\\)\\|ek\\(\\|dir\\)\\|lect\\|"
              "m\\(ctl\\|op\\|get\\)\\|nd\\)\\|h\\(utdown\\|m\\(read\\|ctl\\|"
              "write\\|get\\)\\)\\|y\\(s\\(read\\|call\\|tem\\|write\\)\\|"
              "mlink\\)\\|in\\|leep\\|ocket\\(pair\\|\\)\\)\\|t\\(runcate\\|"
              "ell\\(\\|dir\\)\\|ime\\(\\|s\\)\\)\\|u\\(c\\(\\|first\\)\\|"
              "time\\|mask\\|n\\(pack\\|link\\)\\)\\|v\\(alues\\|ec\\)\\|"
              "w\\(a\\(rn\\|it\\(pid\\|\\)\\|ntarray\\)\\|rite\\)\\|"
              "x\\(\\|or\\)\\|__\\(FILE__\\|LINE__\\)"
              "\\)\\>") 2 'font-lock-type-face)
            ;; In what follows we use `other' style
            ;; for nonoverwritable builtins
            ;; Somehow 's', 'm' are not auto-generated???
            (list
             (concat
              "\\(^\\|[^$@%&\\]\\)\\<\\("
              ;; "AUTOLOAD" "BEGIN" "DESTROY" "END" "__END__" "chomp"
              ;; "chop" "defined" "delete" "do" "each" "else" "elsif"
              ;; "eval" "exists" "for" "foreach" "format" "goto"
              ;; "grep" "if" "keys" "last" "local" "map" "my" "next"
              ;; "no" "package" "pop" "pos" "print" "printf" "push"
              ;; "q" "qq" "qw" "qx" "redo" "return" "scalar" "shift"
              ;; "sort" "splice" "split" "study" "sub" "tie" "tr"
              ;; "undef" "unless" "unshift" "untie" "until" "use"
              ;; "while" "y"
              "AUTOLOAD\\|BEGIN\\|cho\\(p\\|mp\\)\\|d\\(e\\(fined\\|lete\\)\\|"
              "o\\)\\|DESTROY\\|e\\(ach\\|val\\|xists\\|ls\\(e\\|if\\)\\)\\|"
              "END\\|for\\(\\|each\\|mat\\)\\|g\\(rep\\|oto\\)\\|if\\|keys\\|"
              "l\\(ast\\|ocal\\)\\|m\\(ap\\|y\\)\\|n\\(ext\\|o\\)\\|"
              "p\\(ackage\\|rint\\(\\|f\\)\\|ush\\|o\\(p\\|s\\)\\)\\|"
              "q\\(\\|q\\|w\\|x\\)\\|re\\(turn\\|do\\)\\|s\\(pli\\(ce\\|t\\)\\|"
              "calar\\|tudy\\|ub\\|hift\\|ort\\)\\|t\\(r\\|ie\\)\\|"
              "u\\(se\\|n\\(shift\\|ti\\(l\\|e\\)\\|def\\|less\\)\\)\\|"
              "while\\|y\\|__\\(END\\|DATA\\)__" ;__DATA__ added manually
              "\\|[sm]"                 ; Added manually
              "\\)\\>") 2 'font-lock-other-type-face)
            ;;          (mapconcat 'identity
            ;;                     '("#endif" "#else" "#ifdef" "#ifndef" "#if"
            ;;                       "#include" "#define" "#undef")
            ;;                     "\\|")
            '("-[rwxoRWXOezsfdlpSbctugkTBMAC]\\>\\([ \t]+_\\>\\)?" 0
              font-lock-function-name-face keep) ; Not very good, triggers at "[a-z]"
            '("\\<sub[ \t]+\\([^ \t{;]+\\)[ \t]*[{\n]" 1
              font-lock-function-name-face)
            '("\\<\\(package\\|require\\|use\\|import\\|no\\|bootstrap\\)[ \t]+\\([a-zA-z_][a-zA-z_0-9:]*\\)[ \t;]" ; require A if B;
              2 font-lock-function-name-face)
            '("^[ \t]*format[ \t]+\\([a-zA-z_][a-zA-z_0-9:]*\\)[ \t]*=[ \t]*$"
              1 font-lock-function-name-face)
            (cond ((featurep 'font-lock-extra)
                   '("\\([]}\\\\%@>*&]\\|\\$[a-zA-Z0-9_:]*\\)[ \t]*{[ \t]*\\(-?[a-zA-Z0-9_:]+\\)[ \t]*}" 
                     (2 font-lock-string-face t)
                     (0 '(restart 2 t)))) ; To highlight $a{bc}{ef}
                  (font-lock-anchored
                   '("\\([]}\\\\%@>*&]\\|\\$[a-zA-Z0-9_:]*\\)[ \t]*{[ \t]*\\(-?[a-zA-Z0-9_:]+\\)[ \t]*}"
                     (2 font-lock-string-face t)
                     ("\\=[ \t]*{[ \t]*\\(-?[a-zA-Z0-9_:]+\\)[ \t]*}"
                      nil nil
                      (1 font-lock-string-face t))))
                  (t '("\\([]}\\\\%@>*&]\\|\\$[a-zA-Z0-9_:]*\\)[ \t]*{[ \t]*\\(-?[a-zA-Z0-9_:]+\\)[ \t]*}"
                       2 font-lock-string-face t)))
            '("[ \t{,(]\\(-?[a-zA-Z0-9_:]+\\)[ \t]*=>" 1
              font-lock-string-face t)
            '("^[ \t]*\\([a-zA-Z0-9_]+[ \t]*:\\)[ \t]*\\($\\|{\\|\\<\\(until\\|while\\|for\\(each\\)?\\|do\\)\\>\\)" 1 
              font-lock-reference-face) ; labels
            '("\\<\\(continue\\|next\\|last\\|redo\\|goto\\)\\>[ \t]+\\([a-zA-Z0-9_:]+\\)" ; labels as targets
              2 font-lock-reference-face)
            (cond ((featurep 'font-lock-extra)
                   '("^[ \t]*\\(my\\|local\\)[ \t]*\\(([ \t]*\\)?\\([$@%*][a-zA-Z0-9_:]+\\)\\([ \t]*,\\)?"
                     (3 font-lock-variable-name-face)
                     (4 '(another 4 nil
                                  ("\\=[ \t]*,[ \t]*\\([$@%*][a-zA-Z0-9_:]+\\)\\([ \t]*,\\)?"
                                   (1 font-lock-variable-name-face)
                                   (2 '(restart 2 nil) nil t))) 
                        nil t)))        ; local variables, multiple
                  (font-lock-anchored
                   '("^[ \t]*\\(my\\|local\\)[ \t]*\\(([ \t]*\\)?\\([$@%*][a-zA-Z0-9_:]+\\)"
                     (3 font-lock-variable-name-face)
                     ("\\=[ \t]*,[ \t]*\\([$@%*][a-zA-Z0-9_:]+\\)"
                      nil nil
                      (1 font-lock-variable-name-face))))
                  (t '("^[ \t]*\\(my\\|local\\)[ \t]*\\(([ \t]*\\)?\\([$@%*][a-zA-Z0-9_:]+\\)"
                       3 font-lock-variable-name-face)))
            '("\\<for\\(each\\)?[ \t]*\\(\\$[a-zA-Z_][a-zA-Z_0-9]*\\)[ \t]*("
              2 font-lock-variable-name-face)))
          (setq 
           t-font-lock-keywords-1
           (and (fboundp 'turn-on-font-lock) ; Check for newer font-lock
                (not cperl-xemacs-p) ; not yet as of XEmacs 19.12
                '(
                  ("\\(\\([@%]\\|\$#\\)[a-zA-Z_:][a-zA-Z0-9_:]*\\)" 1
                   (if (eq (char-after (match-beginning 2)) ?%)
                       font-lock-other-emphasized-face
                     font-lock-emphasized-face)
                   t)                   ; arrays and hashes
                  ("\\(\\([$@]+\\)[a-zA-Z_:][a-zA-Z0-9_:]*\\)[ \t]*\\([[{]\\)"
                   1
                   (if (= (- (match-end 2) (match-beginning 2)) 1) 
                       (if (eq (char-after (match-beginning 3)) ?{)
                           font-lock-other-emphasized-face
                         font-lock-emphasized-face) ; arrays and hashes
                     font-lock-variable-name-face) ; Just to put something
                   t)
                  ;;("\\([smy]\\|tr\\)\\([^a-z_A-Z0-9]\\)\\(\\([^\n\\]*||\\)\\)\\2")
                       ;;; Too much noise from \s* @s[ and friends
                  ;;("\\(\\<\\([msy]\\|tr\\)[ \t]*\\([^ \t\na-zA-Z0-9_]\\)\\|\\(/\\)\\)" 
                  ;;(3 font-lock-function-name-face t t)
                  ;;(4
                  ;; (if (cperl-slash-is-regexp)
                  ;;    font-lock-function-name-face 'default) nil t))
                  )))
          (setq perl-font-lock-keywords-1 t-font-lock-keywords
                perl-font-lock-keywords perl-font-lock-keywords-1
                perl-font-lock-keywords-2 (append
                                           t-font-lock-keywords
                                           t-font-lock-keywords-1)))
        (if (fboundp 'ps-print-buffer) (cperl-ps-print-init))
        (if (or (featurep 'choose-color) (featurep 'font-lock-extra))
            (font-lock-require-faces
             (list
              ;; Color-light    Color-dark      Gray-light      Gray-dark Mono
              (list 'font-lock-comment-face
                    ["Firebrick"        "OrangeRed"     "DimGray"       "Gray80"]
                    nil
                    [nil                nil             t               t       t]
                    [nil                nil             t               t       t]
                    nil)
              (list 'font-lock-string-face
                    ["RosyBrown"        "LightSalmon"   "Gray50"        "LightGray"]
                    nil
                    nil
                    [nil                nil             t               t       t]
                    nil)
              (list 'font-lock-keyword-face
                    ["Purple"           "LightSteelBlue" "DimGray"      "Gray90"]
                    nil
                    [nil                nil             t               t       t]
                    nil
                    nil)
              (list 'font-lock-function-name-face
                    (vector
                     "Blue"             "LightSkyBlue"  "Gray50"        "LightGray"
                     (cdr (assq 'background-color ; if mono
                                (frame-parameters))))
                    (vector
                     nil                nil             nil             nil
                     (cdr (assq 'foreground-color ; if mono
                                (frame-parameters))))
                    [nil                nil             t               t       t]
                    nil
                    nil)
              (list 'font-lock-variable-name-face
                    ["DarkGoldenrod"    "LightGoldenrod" "DimGray"      "Gray90"]
                    nil
                    [nil                nil             t               t       t]
                    [nil                nil             t               t       t]
                    nil)
              (list 'font-lock-type-face
                    ["DarkOliveGreen"   "PaleGreen"     "DimGray"       "Gray80"]
                    nil
                    [nil                nil             t               t       t]
                    nil
                    [nil                nil             t               t       t]
                    )
              (list 'font-lock-reference-face
                    ["CadetBlue"        "Aquamarine"    "Gray50"        "LightGray"]
                    nil
                    [nil                nil             t               t       t]
                    nil
                    [nil                nil             t               t       t]
                    )
              (list 'font-lock-other-type-face
                    ["chartreuse3"      ("orchid1" "orange")
                     nil                "Gray80"]
                    [nil                nil             "gray90"]
                    [nil                nil             nil             t       t]
                    [nil                nil             t               t]
                    [nil                nil             t               t       t]
                    )
              (list 'font-lock-emphasized-face
                    ["blue"             "yellow"        nil             "Gray80"]
                    ["lightyellow2"     ("navy" "os2blue" "darkgreen")
                     "gray90"]
                    t
                    nil
                    nil)
              (list 'font-lock-other-emphasized-face
                    ["red"              "red"           nil             "Gray80"]
                    ["lightyellow2"     ("navy" "os2blue" "darkgreen")
                     "gray90"]
                    t
                    t
                    nil)))
          (defvar cperl-guessed-background nil
            "Display characteristics as guessed by cperl.")
          (or (fboundp 'x-color-defined-p)
              (defalias 'x-color-defined-p 
                (cond ((fboundp 'color-defined-p) 'color-defined-p)
                      ;; XEmacs >= 19.12
                      ((fboundp 'valid-color-name-p) 'valid-color-name-p)
                      ;; XEmacs 19.11
                      (t 'x-valid-color-name-p))))
          (defvar font-lock-reference-face 'font-lock-reference-face)
          (defvar font-lock-variable-name-face 'font-lock-variable-name-face)
          (or (boundp 'font-lock-type-face)
              (defconst font-lock-type-face
                'font-lock-type-face
                "Face to use for data types.")
              )
          (or (boundp 'font-lock-other-type-face)
              (defconst font-lock-other-type-face
                'font-lock-other-type-face
                "Face to use for data types from another group.")
              )
          (if (not cperl-xemacs-p) nil
            (or (boundp 'font-lock-comment-face)
                (defconst font-lock-comment-face
                  'font-lock-comment-face
                  "Face to use for comments.")
                )
            (or (boundp 'font-lock-keyword-face)
                (defconst font-lock-keyword-face
                  'font-lock-keyword-face
                  "Face to use for keywords.")
                )
            (or (boundp 'font-lock-function-name-face)
                (defconst font-lock-function-name-face
                  'font-lock-function-name-face
                  "Face to use for function names.")
                )
            )
          ;;(if (featurep 'font-lock)
          (if (face-equal font-lock-type-face font-lock-comment-face)
              (defconst font-lock-type-face
                'font-lock-type-face
                "Face to use for basic data types.")
            )
;;;       (if (fboundp 'eval-after-load)
;;;           (eval-after-load "font-lock"
;;;                            '(if (face-equal font-lock-type-face
;;;                                             font-lock-comment-face)
;;;                                 (defconst font-lock-type-face
;;;                                   'font-lock-type-face
;;;                                   "Face to use for basic data types.")
;;;                               )))   ; This does not work :-( Why?!
;;;                                     ; Workaround: added to font-lock-m-h
;;;       )
          (or (boundp 'font-lock-other-emphasized-face)
              (defconst font-lock-other-emphasized-face
                'font-lock-other-emphasized-face
                "Face to use for another type of emphasizing.")
              )
          (or (boundp 'font-lock-emphasized-face)
              (defconst font-lock-emphasized-face
                'font-lock-emphasized-face
                "Face to use for emphasizing.")
              )
          ;; Here we try to guess background
          (let ((background
                 (if (boundp 'font-lock-background-mode)
                     font-lock-background-mode
                   'light)) 
                (face-list (and (fboundp 'face-list) (face-list)))
                is-face)
            (fset 'is-face
                  (cond ((fboundp 'find-face)
                         (symbol-function 'find-face))
                        (face-list
                         (function (lambda (face) (member face face-list))))
                        (t
                         (function (lambda (face) (boundp face))))))
            (defvar cperl-guessed-background
              (if (and (boundp 'font-lock-display-type)
                       (eq font-lock-display-type 'grayscale))
                  'gray
                background)
              "Background as guessed by CPerl mode")
            (if (is-face 'font-lock-type-face) nil
              (copy-face 'default 'font-lock-type-face)
              (cond
               ((eq background 'light)
                (set-face-foreground 'font-lock-type-face
                                     (if (x-color-defined-p "seagreen")
                                         "seagreen"
                                       "sea green")))
               ((eq background 'dark)
                (set-face-foreground 'font-lock-type-face
                                     (if (x-color-defined-p "os2pink")
                                         "os2pink"
                                       "pink")))
               (t
                (set-face-background 'font-lock-type-face "gray90"))))
            (if (is-face 'font-lock-other-type-face)
                nil
              (copy-face 'font-lock-type-face 'font-lock-other-type-face)
              (cond
               ((eq background 'light)
                (set-face-foreground 'font-lock-other-type-face
                                     (if (x-color-defined-p "chartreuse3")
                                         "chartreuse3"
                                       "chartreuse")))
               ((eq background 'dark)
                (set-face-foreground 'font-lock-other-type-face
                                     (if (x-color-defined-p "orchid1")
                                         "orchid1"
                                       "orange")))))
            (if (is-face 'font-lock-other-emphasized-face) nil
              (copy-face 'bold-italic 'font-lock-other-emphasized-face)
              (cond
               ((eq background 'light)
                (set-face-background 'font-lock-other-emphasized-face
                                     (if (x-color-defined-p "lightyellow2")
                                         "lightyellow2"
                                       (if (x-color-defined-p "lightyellow")
                                           "lightyellow"
                                         "light yellow"))))
               ((eq background 'dark)
                (set-face-background 'font-lock-other-emphasized-face
                                     (if (x-color-defined-p "navy")
                                         "navy"
                                       (if (x-color-defined-p "darkgreen")
                                           "darkgreen"
                                         "dark green"))))
               (t (set-face-background 'font-lock-other-emphasized-face "gray90"))))
            (if (is-face 'font-lock-emphasized-face) nil
              (copy-face 'bold 'font-lock-emphasized-face)
              (cond
               ((eq background 'light)
                (set-face-background 'font-lock-emphasized-face
                                     (if (x-color-defined-p "lightyellow2")
                                         "lightyellow2"
                                       "lightyellow")))
               ((eq background 'dark)
                (set-face-background 'font-lock-emphasized-face
                                     (if (x-color-defined-p "navy")
                                         "navy"
                                       (if (x-color-defined-p "darkgreen")
                                           "darkgreen"
                                         "dark green"))))
               (t (set-face-background 'font-lock-emphasized-face "gray90"))))
            (if (is-face 'font-lock-variable-name-face) nil
              (copy-face 'italic 'font-lock-variable-name-face))
            (if (is-face 'font-lock-reference-face) nil
              (copy-face 'italic 'font-lock-reference-face))))
        (setq cperl-faces-init t))
    (error nil)))


(defun cperl-ps-print-init ()
  "Initialization of `ps-print' components for faces used in CPerl."
  ;; Guard against old versions
  (defvar ps-underlined-faces nil)
  (defvar ps-bold-faces nil)
  (defvar ps-italic-faces nil)
  (setq ps-bold-faces
        (append '(font-lock-emphasized-face
                  font-lock-keyword-face 
                  font-lock-variable-name-face 
                  font-lock-reference-face 
                  font-lock-other-emphasized-face) 
                ps-bold-faces))
  (setq ps-italic-faces
        (append '(font-lock-other-type-face
                  font-lock-reference-face 
                  font-lock-other-emphasized-face)
                ps-italic-faces))
  (setq ps-underlined-faces
        (append '(font-lock-emphasized-face
                  font-lock-other-emphasized-face 
                  font-lock-other-type-face font-lock-type-face)
                ps-underlined-faces))
  (cons 'font-lock-type-face ps-underlined-faces))


(if (cperl-enable-font-lock) (cperl-windowed-init))

(defun cperl-set-style (style)
  "Set CPerl-mode variables to use one of several different indentation styles.
The arguments are a string representing the desired style.
Available styles are GNU, K&R, BSD and Whitesmith."
  (interactive 
   (let ((list (mapcar (function (lambda (elt) (list (car elt)))) 
                       c-style-alist)))
     (list (completing-read "Enter style: " list nil 'insist))))
  (let ((style (cdr (assoc style c-style-alist))) setting str sym)
    (while style
      (setq setting (car style) style (cdr style))
      (setq str (symbol-name (car setting)))
      (and (string-match "^c-" str)
           (setq str (concat "cperl-" (substring str 2)))
           (setq sym (intern-soft str))
           (boundp sym)
           (set sym (cdr setting))))))

(defun cperl-check-syntax ()
  (interactive)
  (require 'mode-compile)
  (let ((perl-dbg-flags "-wc"))
    (mode-compile)))

(defun cperl-info-buffer (type)
  ;; Returns buffer with documentation. Creates if missing.
  ;; If TYPE, this vars buffer.
  ;; Special care is taken to not stomp over an existing info buffer
  (let* ((bname (if type "*info-perl-var*" "*info-perl*"))
         (info (get-buffer bname))
         (oldbuf (get-buffer "*info*")))
    (if info info
      (save-window-excursion
        ;; Get Info running
        (require 'info)
        (cond (oldbuf
               (set-buffer oldbuf)
               (rename-buffer "*info-perl-tmp*")))
        (save-window-excursion
          (info))
        (Info-find-node cperl-info-page (if type "perlvar" "perlfunc"))
        (set-buffer "*info*")
        (rename-buffer bname)
        (cond (oldbuf
               (set-buffer "*info-perl-tmp*")
               (rename-buffer "*info*")
               (set-buffer bname)))
        (make-variable-buffer-local 'window-min-height)
        (setq window-min-height 2)
        (current-buffer)))))

(defun cperl-word-at-point (&optional p)
  ;; Returns the word at point or at P.
  (save-excursion
    (if p (goto-char p))
    (or (cperl-word-at-point-hard)
        (progn
          (require 'etags)
          (funcall (or (and (boundp 'find-tag-default-function)
                            find-tag-default-function)
                       (get major-mode 'find-tag-default-function)
                       ;; XEmacs 19.12 has `find-tag-default-hook'; it is
                       ;; automatically used within `find-tag-default':
                       'find-tag-default))))))

(defun cperl-info-on-command (command)
  "Shows documentation for Perl command in other window.
If perl-info buffer is shown in some frame, uses this frame.
Customized by setting variables `cperl-shrink-wrap-info-frame',
`cperl-max-help-size'."
  (interactive 
   (let* ((default (cperl-word-at-point))
          (read (read-string 
                     (format "Find doc for Perl function (default %s): " 
                             default))))
     (list (if (equal read "") 
                   default 
                 read))))

  (let ((buffer (current-buffer))
        (cmd-desc (concat "^" (regexp-quote command) "[^a-zA-Z_0-9]")) ; "tr///"
        pos isvar height iniheight frheight buf win fr1 fr2 iniwin not-loner
        max-height char-height buf-list)
    (if (string-match "^-[a-zA-Z]$" command)
        (setq cmd-desc "^-X[ \t\n]"))
    (setq isvar (string-match "^[$@%]" command)
          buf (cperl-info-buffer isvar)
          iniwin (selected-window)
          fr1 (window-frame iniwin))
    (set-buffer buf)
    (beginning-of-buffer)
    (or isvar 
        (progn (re-search-forward "^-X[ \t\n]")
               (forward-line -1)))
    (if (re-search-forward cmd-desc nil t)
        (progn
          ;; Go back to beginning of the group (ex, for qq)
          (if (re-search-backward "^[ \t\n\f]")
              (forward-line 1))
          (beginning-of-line)
          ;; Get some of 
          (setq pos (point)
                buf-list (list buf "*info-perl-var*" "*info-perl*"))
          (while (and (not win) buf-list)
            (setq win (get-buffer-window (car buf-list) t))
            (setq buf-list (cdr buf-list)))
          (or (not win)
              (eq (window-buffer win) buf)
              (set-window-buffer win buf))
          (and win (setq fr2 (window-frame win)))
          (if (or (not fr2) (eq fr1 fr2))
              (pop-to-buffer buf)
            (special-display-popup-frame buf) ; Make it visible
            (select-window win))
          (goto-char pos)               ; Needed (?!).
          ;; Resize
          (setq iniheight (window-height)
                frheight (frame-height)
                not-loner (< iniheight (1- frheight))) ; Are not alone
          (cond ((if not-loner cperl-max-help-size 
                   cperl-shrink-wrap-info-frame)
                 (setq height 
                       (+ 2 
                          (count-lines 
                           pos 
                           (save-excursion
                             (if (re-search-forward
                                  "^[ \t][^\n]*\n+\\([^ \t\n\f]\\|\\'\\)" nil t)
                                 (match-beginning 0) (point-max)))))
                       max-height 
                       (if not-loner
                           (/ (* (- frheight 3) cperl-max-help-size) 100)
                         (setq char-height (frame-char-height))
                         ;; Non-functioning under OS/2:
                         (if (eq char-height 1) (setq char-height 18))
                         ;; Title, menubar, + 2 for slack
                         (- (/ (x-display-pixel-height) char-height) 4)
                         ))
                 (if (> height max-height) (setq height max-height))
                 ;;(message "was %s doing %s" iniheight height)
                 (if not-loner
                     (enlarge-window (- height iniheight))
                   (set-frame-height (window-frame win) (1+ height)))))
          (set-window-start (selected-window) pos))
      (message "No entry for %s found." command))
    ;;(pop-to-buffer buffer)
    (select-window iniwin)))

(defun cperl-info-on-current-command ()
  "Shows documentation for Perl command at point in other window."
  (interactive)
  (cperl-info-on-command (cperl-word-at-point)))

(defun cperl-imenu-info-imenu-search ()
  (if (looking-at "^-X[ \t\n]") nil
    (re-search-backward
     "^\n\\([-a-zA-Z]+\\)[ \t\n]")
    (forward-line 1)))

(defun cperl-imenu-info-imenu-name ()  
  (buffer-substring
   (match-beginning 1) (match-end 1)))

(defun cperl-imenu-on-info ()
  (interactive)
  (let* ((buffer (current-buffer))
         imenu-create-index-function
         imenu-prev-index-position-function 
         imenu-extract-index-name-function 
         (index-item (save-restriction
                       (save-window-excursion
                         (set-buffer (cperl-info-buffer nil))
                         (setq imenu-create-index-function 
                               'imenu-default-create-index-function
                               imenu-prev-index-position-function
                               'cperl-imenu-info-imenu-search
                               imenu-extract-index-name-function
                               'cperl-imenu-info-imenu-name)
                         (imenu-choose-buffer-index)))))
    (and index-item
         (progn
           (push-mark)
           (pop-to-buffer "*info-perl*")
           (cond
            ((markerp (cdr index-item))
             (goto-char (marker-position (cdr index-item))))
            (t
             (goto-char (cdr index-item))))
           (set-window-start (selected-window) (point))
           (pop-to-buffer buffer)))))

(defun cperl-lineup (beg end &optional step minshift)
  "Lineup construction in a region.
Beginning of region should be at the start of a construction.
All first occurrences of this construction in the lines that are
partially contained in the region are lined up at the same column.

MINSHIFT is the minimal amount of space to insert before the construction.
STEP is the tabwidth to position constructions.
If STEP is `nil', `cperl-lineup-step' will be used 
\(or `cperl-indent-level', if `cperl-lineup-step' is `nil').
Will not move the position at the start to the left."
  (interactive "r")
  (let (search col tcol seen b e)
    (save-excursion
      (goto-char end)
      (end-of-line)
      (setq end (point-marker))
      (goto-char beg)
      (skip-chars-forward " \t\f")
      (setq beg (point-marker))
      (indent-region beg end nil)
      (goto-char beg)
      (setq col (current-column))
      (if (looking-at "[a-zA-Z0-9_]")
          (if (looking-at "\\<[a-zA-Z0-9_]+\\>")
              (setq search
                    (concat "\\<" 
                            (regexp-quote 
                             (buffer-substring (match-beginning 0)
                                               (match-end 0))) "\\>"))
            (error "Cannot line up in a middle of the word"))
        (if (looking-at "$")
            (error "Cannot line up end of line"))
        (setq search (regexp-quote (char-to-string (following-char)))))
      (setq step (or step cperl-lineup-step cperl-indent-level))
      (or minshift (setq minshift 1))
      (while (progn
               (beginning-of-line 2)
               (and (< (point) end) 
                    (re-search-forward search end t)
                    (goto-char (match-beginning 0))))
        (setq tcol (current-column) seen t)
        (if (> tcol col) (setq col tcol)))
      (or seen
          (error "The construction to line up occurred only once"))
      (goto-char beg)
      (setq col (+ col minshift))
      (if (/= (% col step) 0) (setq step (* step (1+ (/ col step)))))
      (while 
          (progn
            (setq e (point))
            (skip-chars-backward " \t")
            (delete-region (point) e)
            (indent-to-column col); (make-string (- col (current-column)) ?\ ))
            (beginning-of-line 2) 
            (and (< (point) end) 
                 (re-search-forward search end t)
                 (goto-char (match-beginning 0)))))))) ; No body

(defun cperl-etags (&optional add all files)
  "Run etags with appropriate options for Perl files.
If optional argument ALL is `recursive', will process Perl files
in subdirectories too."
  (interactive)
  (let ((cmd "etags")
        (args '("-l" "none" "-r" "/\\<\\(package\\|sub\\)[ \\t]+\\(\\([a-zA-Z0-9:_]*::\\)?\\([a-zA-Z0-9_]+\\)[ \\t]*\\([{#]\\|$\\)\\)/\\4/"))
        res)
    (if add (setq args (cons "-a" args)))
    (or files (setq files (list buffer-file-name)))
    (cond
     ((eq all 'recursive)
      ;;(error "Not implemented: recursive")
      (setq args (append (list "-e" 
                               "sub wanted {push @ARGV, $File::Find::name if /\\.[Pp][Llm]$/}
                                use File::Find;
                                find(\\&wanted, '.');
                                exec @ARGV;" 
                               cmd) args)
            cmd "perl"))
     (all 
      ;;(error "Not implemented: all")
      (setq args (append (list "-e" 
                               "push @ARGV, <*.PL *.pl *.pm>;
                                exec @ARGV;" 
                               cmd) args)
            cmd "perl"))
     (t
      (setq args (append args files))))
    (setq res (apply 'call-process cmd nil nil nil args))
    (or (eq res 0)
        (message "etags returned \"%s\"" res))))

(defun cperl-toggle-auto-newline ()
  "Toggle the state of `cperl-auto-newline'."
  (interactive)
  (setq cperl-auto-newline (not cperl-auto-newline))
  (message "Newlines will %sbe auto-inserted now." 
           (if cperl-auto-newline "" "not ")))

(defun cperl-toggle-abbrev ()
  "Toggle the state of automatic keyword expansion in CPerl mode."
  (interactive)
  (abbrev-mode (if abbrev-mode 0 1))
  (message "Perl control structure will %sbe auto-inserted now." 
           (if abbrev-mode "" "not ")))


(defun cperl-toggle-electric ()
  "Toggle the state of parentheses doubling in CPerl mode."
  (interactive)
  (setq cperl-electric-parens (if (cperl-val 'cperl-electric-parens) 'null t))
  (message "Parentheses will %sbe auto-doubled now." 
           (if (cperl-val 'cperl-electric-parens) "" "not ")))

;;;; Tags file creation.

(defvar cperl-tmp-buffer " *cperl-tmp*")

(defun cperl-setup-tmp-buf ()
  (set-buffer (get-buffer-create cperl-tmp-buffer))
  (set-syntax-table cperl-mode-syntax-table)
  (buffer-disable-undo)
  (auto-fill-mode 0))

(defun cperl-xsub-scan ()
  (require 'cl)
  (require 'imenu)
  (let ((index-alist '()) 
        (prev-pos 0) index index1 name package prefix)
    (goto-char (point-min))
    (imenu-progress-message prev-pos 0)
    ;; Search for the function
    (progn ;;save-match-data
      (while (re-search-forward
              "^\\([ \t]*MODULE\\>[^\n]*\\<PACKAGE[ \t]*=[ \t]*\\([a-zA-Z_][a-zA-Z_0-9:]*\\)\\>\\|\\([a-zA-Z_][a-zA-Z_0-9]*\\)(\\|[ \t]*BOOT:\\)"
              nil t)
        (imenu-progress-message prev-pos)
        (cond
         ((match-beginning 2)   ; SECTION
          (setq package (buffer-substring (match-beginning 2) (match-end 2)))
          (goto-char (match-beginning 0))
          (skip-chars-forward " \t")
          (forward-char 1)
          (if (looking-at "[^\n]*\\<PREFIX[ \t]*=[ \t]*\\([a-zA-Z_][a-zA-Z_0-9]*\\)\\>")
              (setq prefix (buffer-substring (match-beginning 1) (match-end 1)))
            (setq prefix nil)))
         ((not package) nil)            ; C language section
         ((match-beginning 3)           ; XSUB
          (goto-char (1+ (match-beginning 3)))
          (setq index (imenu-example--name-and-position))
          (setq name (buffer-substring (match-beginning 3) (match-end 3)))
          (if (and prefix (string-match (concat "^" prefix) name))
              (setq name (substring name (length prefix))))
          (cond ((string-match "::" name) nil)
                (t
                 (setq index1 (cons (concat package "::" name) (cdr index)))
                 (push index1 index-alist)))
          (setcar index name)
          (push index index-alist))
         (t                             ; BOOT: section
          ;; (beginning-of-line)
          (setq index (imenu-example--name-and-position))
          (setcar index (concat package "::BOOT:"))
          (push index index-alist)))))
    (imenu-progress-message prev-pos 100)
    ;;(setq index-alist 
    ;;      (if (default-value 'imenu-sort-function)
    ;;          (sort index-alist (default-value 'imenu-sort-function))
    ;;          (nreverse index-alist)))
    index-alist))

(defun cperl-find-tags (file xs)
  (let (ind (b (get-buffer cperl-tmp-buffer)) lst elt pos ret)
    (save-excursion
      (if b (set-buffer b)
          (cperl-setup-tmp-buf))
      (erase-buffer)
      (setq file (car (insert-file-contents file)))
      (message "Scanning file %s..." file)
      (if xs
          (setq lst (cperl-xsub-scan))
        (setq ind (imenu-example--create-perl-index))
        (setq lst (cdr (assoc "+Unsorted List+..." ind))))
      (setq lst 
            (mapcar 
             (function 
              (lambda (elt)
                (cond ((string-match "^[_a-zA-Z]" (car elt))
                       (goto-char (cdr elt))
                       (list (car elt) 
                             (point) (count-lines 1 (point))
                             (buffer-substring (progn
                                                 (skip-chars-forward 
                                                  ":_a-zA-Z0-9")
                                                 (or (eolp) (forward-char 1))
                                                 (point))
                                               (progn
                                                 (beginning-of-line)
                                                 (point))))))))
                    lst))
      (erase-buffer)
      (while lst
        (setq elt (car lst) lst (cdr lst))
        (if elt
            (progn
              (insert (elt elt 3) 
                      127
                      (if (string-match "^package " (car elt))
                          (substring (car elt) 8)
                        (car elt) )
                      1
                      (number-to-string (elt elt 1))
                      ","
                      (number-to-string (elt elt 2))
                      "\n")
              (if (and (string-match "^[_a-zA-Z]+::" (car elt))
                       (string-match "^sub[ \t]+\\([_a-zA-Z]+\\)[^:_a-zA-Z]"
                                     (elt elt 3)))
                  ;; Need to insert the name without package as well
                  (setq lst (cons (cons (substring (elt elt 3) 
                                                   (match-beginning 1)
                                                   (match-end 1))
                                        (cdr elt))
                                  lst))))))
      (setq pos (point))
      (goto-char 1)
      (insert "\f\n" file "," (number-to-string (1- pos)) "\n")
      (setq ret (buffer-substring 1 (point-max)))
      (erase-buffer)
      (message "Scanning file %s finished" file)
      ret)))

(defun cperl-write-tags (&optional file erase recurse dir inbuffer)
  ;; If INBUFFER, do not select buffer, and do not save
  ;; If ERASE is `ignore', do not erase, and do not try to delete old info.
  (require 'etags)
  (if file nil
    (setq file (if dir default-directory (buffer-file-name)))
    (if (and (not dir) (buffer-modified-p)) (error "Save buffer first!")))
  (let ((tags-file-name "TAGS")
        (case-fold-search (eq system-type 'emx))
        xs)
    (save-excursion
      (cond (inbuffer nil)              ; Already there
            ((file-exists-p tags-file-name)
             (visit-tags-table-buffer tags-file-name))
            (t (set-buffer (find-file-noselect tags-file-name))))
      (cond
       (dir
        (cond ((eq erase 'ignore))
              (erase
               (erase-buffer)
               (setq erase 'ignore)))
        (let ((files 
               (directory-files file t (if recurse nil "\\.[Pp][Llm]$") t)))
          (mapcar (function (lambda (file)
                              (cond
                               ((string-match "/\\.\\.?$" file) nil)
                               ((not (file-directory-p file))
                                (if (string-match "\\.\\([Pp][Llm]\\|xs\\)$" file)
                                    (cperl-write-tags file erase recurse nil t)))
                               ((not recurse) nil)
                               (t (cperl-write-tags file erase recurse t t)))))
                  files))
        )
       (t
        (setq xs (string-match "\\.xs$" file))
        (cond ((eq erase 'ignore) (goto-char (point-max)))
              (erase (erase-buffer))
              (t
               (goto-char 1)
               (if (search-forward (concat "\f\n" file ",") nil t)
                   (progn
                     (search-backward "\f\n")
                     (delete-region (point)
                                    (progn 
                                      (forward-char 1)
                                      (search-forward "\f\n" nil 'toend)
                                      (point))))
                 (goto-char (point-max)))))
        (insert (cperl-find-tags file xs))))
      (if inbuffer nil          ; Delegate to the caller
        (save-buffer 0)         ; No backup
        (if (fboundp 'initialize-new-tags-table) ; Do we need something special in XEmacs?
            (initialize-new-tags-table))))))

(defvar cperl-tags-hier-regexp-list
  "^\\(\\(package\\)\\>\\|sub\\>[^\n]+::\\|[a-zA-Z_][a-zA-Z_0-9:]*(\C-?[^\n]+::\\|[ \t]*BOOT:\C-?[^\n]+::\\)")

(defvar cperl-hierarchy '(() ())
  "Global hierarchy of classes")

(defun cperl-tags-hier-fill ()
  ;; Suppose we are in a tag table cooked by cperl.
  (goto-char 1)
  (let (type pack name pos line chunk ord cons1 file str info fileind)
    (while (re-search-forward cperl-tags-hier-regexp-list nil t)
      (setq pos (match-beginning 0) 
            pack (match-beginning 2))
      (beginning-of-line)
      (if (looking-at "\\([^\n]+\\)\C-?\\([^\n]+\\)\C-a\\([0-9]+\\),\\([0-9]+\\)")
          (progn
            (setq ;;str (buffer-substring (match-beginning 1) (match-end 1))
                  name (buffer-substring (match-beginning 2) (match-end 2))
                  ;;pos (buffer-substring (match-beginning 3) (match-end 3))
                  line (buffer-substring (match-beginning 4) (match-end 4))
                  ord (if pack 1 0)
                  info (etags-snarf-tag) ; Moves to beginning of the next line
                  file (file-of-tag)
                  fileind (format "%s:%s" file line))
            ;; Move back
            (forward-char -1)
            ;; Make new member of hierarchy name ==> file ==> pos if needed
            (if (setq cons1 (assoc name (nth ord cperl-hierarchy)))
                ;; Name known
                (setcdr cons1 (cons (cons fileind (vector file info))
                                    (cdr cons1)))
              ;; First occurrence of the name, start alist
              (setq cons1 (cons name (list (cons fileind (vector file info)))))
              (if pack 
                  (setcar (cdr cperl-hierarchy)
                          (cons cons1 (nth 1 cperl-hierarchy)))
                (setcar cperl-hierarchy
                        (cons cons1 (car cperl-hierarchy)))))))
      (end-of-line))))

(defun cperl-tags-hier-init (&optional update)
  "Show hierarchical menu of classes and methods.
Finds info about classes by a scan of loaded TAGS files.
Supposes that the TAGS files contain fully qualified function names.
One may build such TAGS files from CPerl mode menu."
  (interactive)
  (require 'etags)
  (require 'imenu)
  (if (or update (null (nth 2 cperl-hierarchy)))
      (let (pack name cons1 to l1 l2 l3 l4
                 (remover (function (lambda (elt) ; (name (file1...) (file2..))
                                      (or (nthcdr 2 elt)
                                          ;; Only in one file
                                          (setcdr elt (cdr (nth 1 elt))))))))
        ;; (setq cperl-hierarchy '(() () ())) ; Would write into '() later!
        (setq cperl-hierarchy (list l1 l2 l3))
        (or tags-table-list
            (call-interactively 'visit-tags-table))
        (message "Updating list of classes...")
        (mapcar 
         (function
          (lambda (tagsfile)
            (set-buffer (get-file-buffer tagsfile))
            (cperl-tags-hier-fill)))
         tags-table-list)
        (mapcar remover (car cperl-hierarchy))
        (mapcar remover (nth 1 cperl-hierarchy))
        (setq to (list nil (cons "Packages: " (nth 1 cperl-hierarchy))
                       (cons "Methods: " (car cperl-hierarchy))))
        (cperl-tags-treeify to 1)
        (setcar (nthcdr 2 cperl-hierarchy)
                (cperl-menu-to-keymap (cons '("+++UPDATE+++" . -999) (cdr to))))
        (message "Updating list of classes: done, requesting display...")
        ;;(cperl-imenu-addback (nth 2 cperl-hierarchy))
        ))
  (or (nth 2 cperl-hierarchy)
      (error "No items found"))
  (setq update
;;;     (imenu-choose-buffer-index "Packages: " (nth 2 cperl-hierarchy))
        (if window-system
            (x-popup-menu t (nth 2 cperl-hierarchy))
          (require 'tmm)
          (tmm-prompt t (nth 2 cperl-hierarchy))))
  (if (and update (listp update))
      (progn (while (cdr update) (setq update (cdr update)))
             (setq update (car update)))) ; Get the last from the list
  (if (vectorp update) 
      (progn
        (find-file (elt update 0))
        (etags-goto-tag-location (elt update 1))))
  (if (eq update -999) (cperl-tags-hier-init t)))

(defun cperl-tags-treeify (to level)
  ;; cadr of to is read-write. On start it is a cons
  (let* ((regexp (concat "^\\(" (mapconcat 
                                 'identity
                                 (make-list level "[_a-zA-Z0-9]+")
                                 "::")
                         "\\)\\(::\\)?"))
         (packages (cdr (nth 1 to)))
         (methods (cdr (nth 2 to)))
         l1 head tail cons1 cons2 ord writeto packs recurse
         root-packages root-functions ms many_ms same_name ps
         (move-deeper
          (function 
           (lambda (elt)
             (cond ((and (string-match regexp (car elt))
                         (or (eq ord 1) (match-end 2)))
                    (setq head (substring (car elt) 0 (match-end 1))
                          tail (if (match-end 2) (substring (car elt) 
                                                            (match-end 2)))
                          recurse t)
                    (if (setq cons1 (assoc head writeto)) nil
                      ;; Need to init new head
                      (setcdr writeto (cons (list head (list "Packages: ")
                                                  (list "Methods: "))
                                            (cdr writeto)))
                      (setq cons1 (nth 1 writeto)))
                    (setq cons2 (nth ord cons1)) ; Either packs or meths
                    (setcdr cons2 (cons elt (cdr cons2))))
                   ((eq ord 2)
                    (setq root-functions (cons elt root-functions)))
                   (t
                    (setq root-packages (cons elt root-packages))))))))
    (setcdr to l1)                      ; Init to dynamic space
    (setq writeto to)
    (setq ord 1)
    (mapcar move-deeper packages)
    (setq ord 2)
    (mapcar move-deeper methods)
    (if recurse
        (mapcar (function (lambda (elt)
                          (cperl-tags-treeify elt (1+ level))))
                (cdr to)))
    ;; Now add back functions removed from display
    (mapcar (function (lambda (elt)
                        (setcdr to (cons elt (cdr to)))))
            root-functions)
    ;; Now add back packages removed from display
    (mapcar (function (lambda (elt)
                        (setcdr to (cons (cons (concat "package " (car elt)) 
                                               (cdr elt)) 
                                         (cdr to)))))
            root-packages)
    ;;Now clean up leaders with one child only
    (mapcar (function (lambda (elt)
                        (if (not (and (listp (cdr elt)) 
                                      (eq (length elt) 2))) nil
                            (setcar elt (car (nth 1 elt)))
                            (setcdr elt (cdr (nth 1 elt))))))
            (cdr to))
    ))

;;;(x-popup-menu t
;;;   '(keymap "Name1" 
;;;         ("Ret1" "aa")
;;;         ("Head1" "ab"  
;;;          keymap "Name2" 
;;;          ("Tail1" "x") ("Tail2" "y"))))

(defun cperl-list-fold (list name limit)
  (let (list1 list2 elt1 (num 0))
    (if (<= (length list) limit) list
      (setq list1 nil list2 nil)
      (while list
        (setq num (1+ num) 
              elt1 (car list)
              list (cdr list))
        (if (<= num imenu-max-items)
            (setq list2 (cons elt1 list2))
          (setq list1 (cons (cons name
                                  (nreverse list2))
                            list1)
                list2 (list elt1)
                num 1)))
      (nreverse (cons (cons name
                            (nreverse list2))
                      list1)))))

(defun cperl-menu-to-keymap (menu &optional name)
  (let (list)
    (cons 'keymap 
          (mapcar 
           (function 
            (lambda (elt)
              (cond ((listp (cdr elt))
                     (setq list (cperl-list-fold
                                 (cdr elt) (car elt) imenu-max-items))
                     (cons nil
                           (cons (car elt)
                                 (cperl-menu-to-keymap list))))
                    (t
                     (list (cdr elt) (car elt))))))
           (cperl-list-fold menu "Root" imenu-max-items)))))

\f
(defvar cperl-bad-style-regexp
  (mapconcat 'identity
   '("[^-\n\t <>=+!.&|(*/'`\"#^][-=+<>!|&^]" ; char sign
     "[-<>=+^&|]+[^- \t\n=+<>~]"        ; sign+ char
     )
   "\\|")
  "Finds places such that insertion of a whitespace may help a lot.")

(defvar cperl-not-bad-style-regexp 
  (mapconcat 'identity
   '("[^-\t <>=+]\\(--\\|\\+\\+\\)"     ; var-- var++
     "[a-zA-Z0-9][|&][a-zA-Z0-9$]"      ; abc|def abc&def are often used.
     "&[(a-zA-Z0-9$]"                   ; &subroutine &(var->field)
     "<\\$?\\sw+\\(\\.\\sw+\\)?>"       ; <IN> <stdin.h>
     "-[a-zA-Z][ \t]+[_$\"'`]"          ; -f file
     "-[0-9]"                           ; -5
     "\\+\\+"                           ; ++var
     "--"                               ; --var
     ".->"                              ; a->b
     "->"                               ; a SPACE ->b
     "\\[-"                             ; a[-1]
     "^="                               ; =head
     "||"
     "&&"
     "[CBIXSLFZ]<\\(\\sw\\|\\s \\|\\s_\\|[\n]\\)*>" ; C<code like text>
     "-[a-zA-Z0-9]+[ \t]*=>"                    ; -option => value
     ;; Unaddressed trouble spots: = -abc, f(56, -abc) --- specialcased below
     ;;"[*/+-|&<.]+="
     )
   "\\|")
  "If matches at the start of match found by `my-bad-c-style-regexp',
insertion of a whitespace will not help.")

(defvar found-bad)

(defun cperl-find-bad-style ()
  "Find places in the buffer where insertion of a whitespace may help.
Prompts user for insertion of spaces.
Currently it is tuned to C and Perl syntax."
  (interactive)
  (let (found-bad (p (point)))
    (setq last-nonmenu-event 13)        ; To disable popup
    (beginning-of-buffer)
    (map-y-or-n-p "Insert space here? "
                  (function (lambda (arg) (insert " ")))
                  'cperl-next-bad-style
                  '("location" "locations" "insert a space into") 
                  '((?\C-r (lambda (arg)
                             (let ((buffer-quit-function
                                    'exit-recursive-edit))
                               (message "Exit with Esc Esc")
                               (recursive-edit)
                               t))      ; Consider acted upon
                           "edit, exit with Esc Esc") 
                    (?e (lambda (arg)
                          (let ((buffer-quit-function
                                 'exit-recursive-edit))
                            (message "Exit with Esc Esc")
                            (recursive-edit)
                            t))         ; Consider acted upon
                        "edit, exit with Esc Esc"))
                  t)
    (if found-bad (goto-char found-bad)
      (goto-char p)
      (message "No appropriate place found"))))

(defun cperl-next-bad-style ()
  (let (p (not-found t) (point (point)) found)
    (while (and not-found
                (re-search-forward cperl-bad-style-regexp nil 'to-end))
      (setq p (point))
      (goto-char (match-beginning 0))
      (if (or
           (looking-at cperl-not-bad-style-regexp)
           ;; Check for a < -b and friends
           (and (eq (following-char) ?\-)
                (save-excursion
                  (skip-chars-backward " \t\n")
                  (memq (preceding-char) '(?\= ?\> ?\< ?\, ?\(, ?\[, ?\{))))
           ;; Now check for syntax type
           (save-match-data
             (setq found (point))
             (beginning-of-defun)
             (let ((pps (parse-partial-sexp (point) found)))
               (or (nth 3 pps) (nth 4 pps) (nth 5 pps)))))
          (goto-char (match-end 0))
        (goto-char (1- p))
        (setq not-found nil
              found-bad found)))
    (not not-found)))

\ 6
;;; Getting help
(defvar cperl-have-help-regexp 
  ;;(concat "\\("
  (mapconcat
   'identity
   '("[$@%*&][0-9a-zA-Z_:]+\\([ \t]*[[{]\\)?"           ; Usual variable
     "[$@]\\^[a-zA-Z]"                  ; Special variable
     "[$@][^ \n\t]"                     ; Special variable
     "-[a-zA-Z]"                        ; File test
     "\\\\[a-zA-Z0]"                    ; Special chars
     "^=[a-z][a-zA-Z0-9_]*"             ; Pod sections
     "[-!&*+,-./<=>?\\\\^|~]+"          ; Operator
     "[a-zA-Z_0-9:]+"                   ; symbol or number
     "x="
     "#!"
     )
   ;;"\\)\\|\\("
   "\\|"
   )
          ;;"\\)"
          ;;)
  "Matches places in the buffer we can find help for.")

(defvar cperl-message-on-help-error t)
(defvar cperl-help-from-timer nil)

(defun cperl-word-at-point-hard ()
  ;; Does not save-excursion
  ;; Get to the something meaningful
  (or (eobp) (eolp) (forward-char 1))
  (re-search-backward "[-a-zA-Z0-9_:!&*+,-./<=>?\\\\^|~$%@]" 
                      (save-excursion (beginning-of-line) (point))
                      'to-beg)
  ;;  (cond
  ;;   ((or (eobp) (looking-at "[][ \t\n{}();,]")) ; Not at a symbol
  ;;    (skip-chars-backward " \n\t\r({[]});,")
  ;;    (or (bobp) (backward-char 1))))
  ;; Try to backtrace
  (cond
   ((looking-at "[a-zA-Z0-9_:]")        ; symbol
    (skip-chars-backward "[a-zA-Z0-9_:]")
    (cond 
     ((and (eq (preceding-char) ?^)     ; $^I
           (eq (char-after (- (point) 2)) ?\$))
      (forward-char -2))
     ((memq (preceding-char) (append "*$@%&\\" nil)) ; *glob
      (forward-char -1))
     ((and (eq (preceding-char) ?\=)
           (eq (current-column) 1))
      (forward-char -1)))               ; =head1
    (if (and (eq (preceding-char) ?\<)
             (looking-at "\\$?[a-zA-Z0-9_:]+>")) ; <FH>
        (forward-char -1)))
   ((and (looking-at "=") (eq (preceding-char) ?x)) ; x=
    (forward-char -1))
   ((and (looking-at "\\^") (eq (preceding-char) ?\$)) ; $^I
    (forward-char -1))
   ((looking-at "[-!&*+,-./<=>?\\\\^|~]")
    (skip-chars-backward "[-!&*+,-./<=>?\\\\^|~]")
    (cond
     ((and (eq (preceding-char) ?\$)
           (not (eq (char-after (- (point) 2)) ?\$))) ; $-
      (forward-char -1))
     ((and (eq (following-char) ?\>)
           (string-match "[a-zA-Z0-9_]" (char-to-string (preceding-char)))
           (save-excursion
             (forward-sexp -1)
             (and (eq (preceding-char) ?\<)
                  (looking-at "\\$?[a-zA-Z0-9_:]+>")))) ; <FH>
      (search-backward "<"))))
   ((and (eq (following-char) ?\$)
         (eq (preceding-char) ?\<)
         (looking-at "\\$?[a-zA-Z0-9_:]+>")) ; <$fh>
    (forward-char -1)))
  (if (looking-at cperl-have-help-regexp)
      (buffer-substring (match-beginning 0) (match-end 0))))

(defun cperl-get-help ()
  "Get one-line docs on the symbol at the point.
The data for these docs is a little bit obsolete and may be in fact longer
than a line. Your contribution to update/shorten it is appreciated."
  (interactive)
  (save-excursion
    (let ((word (cperl-word-at-point-hard)))
      (if word
          (if (and cperl-help-from-timer ; Bail out if not in mainland
                   (not (string-match "^#!\\|\\\\\\|^=" word)) ; Show help even in comments/strings.
                   (or (memq (get-text-property (point) 'face)
                             '(font-lock-comment-face font-lock-string-face))
                       (memq (get-text-property (point) 'syntax-type)
                             '(pod here-doc format))))
              nil
            (cperl-describe-perl-symbol word))
        (if cperl-message-on-help-error
            (message "Nothing found for %s..." 
                     (buffer-substring (point) (+ 5 (point)))))))))

;;; Stolen from perl-descr.el by Johan Vromans:

(defvar cperl-doc-buffer " *perl-doc*"
  "Where the documentation can be found.")

(defun cperl-describe-perl-symbol (val)
  "Display the documentation of symbol at point, a Perl operator."
  (let ((enable-recursive-minibuffers t)
        args-file regexp)
    (cond
        ((string-match "^[&*][a-zA-Z_]" val)
         (setq val (concat (substring val 0 1) "NAME")))
        ((string-match "^[$@]\\([a-zA-Z_:0-9]+\\)[ \t]*\\[" val)
         (setq val (concat "@" (substring val 1 (match-end 1)))))
        ((string-match "^[$@]\\([a-zA-Z_:0-9]+\\)[ \t]*{" val)
         (setq val (concat "%" (substring val 1 (match-end 1)))))
        ((and (string= val "x") (string-match "^x=" val))
         (setq val "x="))
        ((string-match "^\\$[\C-a-\C-z]" val)
         (setq val (concat "$^" (char-to-string (+ ?A -1 (aref val 1))))))
        ((string-match "^CORE::" val)
         (setq val "CORE::"))
        ((string-match "^SUPER::" val)
         (setq val "SUPER::"))
        ((and (string= "<" val) (string-match "^<\\$?[a-zA-Z0-9_:]+>" val))
         (setq val "<NAME>")))
    (setq regexp (concat "^" 
                         "\\([^a-zA-Z0-9_:]+[ \t]+\\)?"
                         (regexp-quote val) 
                         "\\([ \t([/]\\|$\\)"))

    ;; get the buffer with the documentation text
    (cperl-switch-to-doc-buffer)

    ;; lookup in the doc
    (goto-char (point-min))
    (let ((case-fold-search nil))
      (list 
       (if (re-search-forward regexp (point-max) t)
           (save-excursion
             (beginning-of-line 1)
             (let ((lnstart (point)))
               (end-of-line)
               (message "%s" (buffer-substring lnstart (point)))))
         (if cperl-message-on-help-error
             (message "No definition for %s" val)))))))

(defvar cperl-short-docs "Ignore my value"
  ;; Perl4 version was written by Johan Vromans (jvromans@squirrel.nl)
  "# based on '@(#)@ perl-descr.el 1.9 - describe-perl-symbol' [Perl 5]
! ...   Logical negation.       
... != ...      Numeric inequality.
... !~ ...      Search pattern, substitution, or translation (negated).
$!      In numeric context: errno. In a string context: error string.
$\"     The separator which joins elements of arrays interpolated in strings.
$#      The output format for printed numbers. Initial value is %.20g.
$$      Process number of this script. Changes in the fork()ed child process.
$%      The current page number of the currently selected output channel.

        The following variables are always local to the current block:

$1      Match of the 1st set of parentheses in the last match (auto-local).
$2      Match of the 2nd set of parentheses in the last match (auto-local).
$3      Match of the 3rd set of parentheses in the last match (auto-local).
$4      Match of the 4th set of parentheses in the last match (auto-local).
$5      Match of the 5th set of parentheses in the last match (auto-local).
$6      Match of the 6th set of parentheses in the last match (auto-local).
$7      Match of the 7th set of parentheses in the last match (auto-local).
$8      Match of the 8th set of parentheses in the last match (auto-local).
$9      Match of the 9th set of parentheses in the last match (auto-local).
$&      The string matched by the last pattern match (auto-local).
$'      The string after what was matched by the last match (auto-local).
$`      The string before what was matched by the last match (auto-local).

$(      The real gid of this process.
$)      The effective gid of this process.
$*      Deprecated: Set to 1 to do multiline matching within a string.
$+      The last bracket matched by the last search pattern.
$,      The output field separator for the print operator.
$-      The number of lines left on the page.
$.      The current input line number of the last filehandle that was read.
$/      The input record separator, newline by default.
$0      Name of the file containing the perl script being executed. May be set.
$:     String may be broken after these characters to fill ^-lines in a format.
$;      Subscript separator for multi-dim array emulation. Default \"\\034\".
$<      The real uid of this process.
$=      The page length of the current output channel. Default is 60 lines.
$>      The effective uid of this process.
$?      The status returned by the last ``, pipe close or `system'.
$@      The perl error message from the last eval or do @var{EXPR} command.
$ARGV   The name of the current file used with <> .
$[      Deprecated: The index of the first element/char in an array/string.
$\\     The output record separator for the print operator.
$]      The perl version string as displayed with perl -v.
$^      The name of the current top-of-page format.
$^A     The current value of the write() accumulator for format() lines.
$^D     The value of the perl debug (-D) flags.
$^E     Information about the last system error other than that provided by $!.
$^F     The highest system file descriptor, ordinarily 2.
$^H     The current set of syntax checks enabled by `use strict'.
$^I     The value of the in-place edit extension (perl -i option).
$^L     What formats output to perform a formfeed. Default is \f.
$^O     The operating system name under which this copy of Perl was built.
$^P     Internal debugging flag.
$^T     The time the script was started. Used by -A/-M/-C file tests.
$^W     True if warnings are requested (perl -w flag).
$^X     The name under which perl was invoked (argv[0] in C-speech).
$_      The default input and pattern-searching space.
$|      Auto-flush after write/print on the current output channel? Default 0. 
$~      The name of the current report format.
... % ...       Modulo division.
... %= ...      Modulo division assignment.
%ENV    Contains the current environment.
%INC    List of files that have been require-d or do-ne.
%SIG    Used to set signal handlers for various signals.
... & ...       Bitwise and.
... && ...      Logical and.
... &&= ...     Logical and assignment.
... &= ...      Bitwise and assignment.
... * ...       Multiplication.
... ** ...      Exponentiation.
*NAME   Glob: all objects refered by NAME. *NAM1 = *NAM2 aliases NAM1 to NAM2.
&NAME(arg0, ...)        Subroutine call. Arguments go to @_.
... + ...       Addition.               +EXPR   Makes EXPR into scalar context.
++      Auto-increment (magical on strings).    ++EXPR  EXPR++
... += ...      Addition assignment.
,       Comma operator.
... - ...       Subtraction.
--      Auto-decrement (NOT magical on strings).        --EXPR  EXPR--
... -= ...      Subtraction assignment.
-A      Access time in days since script started.
-B      File is a non-text (binary) file.
-C      Inode change time in days since script started.
-M      Age in days since script started.
-O      File is owned by real uid.
-R      File is readable by real uid.
-S      File is a socket .
-T      File is a text file.
-W      File is writable by real uid.
-X      File is executable by real uid.
-b      File is a block special file.
-c      File is a character special file.
-d      File is a directory.
-e      File exists .
-f      File is a plain file.
-g      File has setgid bit set.
-k      File has sticky bit set.
-l      File is a symbolic link.
-o      File is owned by effective uid.
-p      File is a named pipe (FIFO).
-r      File is readable by effective uid.
-s      File has non-zero size.
-t      Tests if filehandle (STDIN by default) is opened to a tty.
-u      File has setuid bit set.
-w      File is writable by effective uid.
-x      File is executable by effective uid.
-z      File has zero size.
.       Concatenate strings.
..      Alternation, also range operator.
.=      Concatenate assignment strings
... / ...       Division.       /PATTERN/ioxsmg Pattern match
... /= ...      Division assignment.
/PATTERN/ioxsmg Pattern match.
... < ...       Numeric less than.      <pattern>       Glob.   See <NAME>, <> as well.
<NAME>  Reads line from filehandle NAME. NAME must be bareword/dollar-bareword.
<pattern>       Glob. (Unless pattern is bareword/dollar-bareword - see <NAME>)
<>      Reads line from union of files in @ARGV (= command line) and STDIN.
... << ...      Bitwise shift left.     <<      start of HERE-DOCUMENT.
... <= ...      Numeric less than or equal to.
... <=> ...     Numeric compare.
... = ...       Assignment.
... == ...      Numeric equality.
... =~ ...      Search pattern, substitution, or translation
... > ...       Numeric greater than.
... >= ...      Numeric greater than or equal to.
... >> ...      Bitwise shift right.
... >>= ...     Bitwise shift right assignment.
... ? ... : ... Condition=if-then-else operator.   ?PAT? One-time pattern match.
?PATTERN?       One-time pattern match.
@ARGV   Command line arguments (not including the command name - see $0).
@INC    List of places to look for perl scripts during do/include/use.
@_      Parameter array for subroutines. Also used by split unless in array context.
\\      Creates a reference to whatever follows, like \$var.
\\0     Octal char, e.g. \\033.
\\E     Case modification terminator. See \\Q, \\L, and \\U.
\\L     Lowercase until \\E . See also \l, lc.
\\U     Upcase until \\E . See also \u, uc.
\\Q     Quote metacharacters until \\E . See also quotemeta.
\\a     Alarm character (octal 007).
\\b     Backspace character (octal 010).
\\c     Control character, e.g. \\c[ .
\\e     Escape character (octal 033).
\\f     Formfeed character (octal 014).
\\l     Lowercase the next character. See also \\L and \\u, lcfirst,
\\n     Newline character (octal 012).
\\r     Return character (octal 015).
\\t     Tab character (octal 011).
\\u     Upcase the next character. See also \\U and \\l, ucfirst,
\\x     Hex character, e.g. \\x1b.
^ ...   Bitwise exclusive or.
__END__ Ends program source.
__DATA__        Ends program source.
__FILE__        Current (source) filename.
__LINE__        Current line in current source.
ARGV    Default multi-file input filehandle. <ARGV> is a synonym for <>.
ARGVOUT Output filehandle with -i flag.
BEGIN { ... }   Immediately executed (during compilation) piece of code.
END { ... }     Pseudo-subroutine executed after the script finishes.
DATA    Input filehandle for what follows after __END__ or __DATA__.
accept(NEWSOCKET,GENERICSOCKET)
alarm(SECONDS)
atan2(X,Y)
bind(SOCKET,NAME)
binmode(FILEHANDLE)
caller[(LEVEL)]
chdir(EXPR)
chmod(LIST)
chop[(LIST|VAR)]
chown(LIST)
chroot(FILENAME)
close(FILEHANDLE)
closedir(DIRHANDLE)
... cmp ...     String compare.
connect(SOCKET,NAME)
continue of { block } continue { block }. Is executed after `next' or at end.
cos(EXPR)
crypt(PLAINTEXT,SALT)
dbmclose(%HASH)
dbmopen(%HASH,DBNAME,MODE)
defined(EXPR)
delete($HASH{KEY})
die(LIST)
do { ... }|SUBR while|until EXPR        executes at least once
do(EXPR|SUBR([LIST]))
dump LABEL
each(%HASH)
endgrent
endhostent
endnetent
endprotoent
endpwent
endservent
eof[([FILEHANDLE])]
... eq ...      String equality.
eval(EXPR) or eval { BLOCK }
exec(LIST)
exit(EXPR)
exp(EXPR)
fcntl(FILEHANDLE,FUNCTION,SCALAR)
fileno(FILEHANDLE)
flock(FILEHANDLE,OPERATION)
for (EXPR;EXPR;EXPR) { ... }
foreach [VAR] (@ARRAY) { ... }
fork
... ge ...      String greater than or equal.
getc[(FILEHANDLE)]
getgrent
getgrgid(GID)
getgrnam(NAME)
gethostbyaddr(ADDR,ADDRTYPE)
gethostbyname(NAME)
gethostent
getlogin
getnetbyaddr(ADDR,ADDRTYPE)
getnetbyname(NAME)
getnetent
getpeername(SOCKET)
getpgrp(PID)
getppid
getpriority(WHICH,WHO)
getprotobyname(NAME)
getprotobynumber(NUMBER)
getprotoent
getpwent
getpwnam(NAME)
getpwuid(UID)
getservbyname(NAME,PROTO)
getservbyport(PORT,PROTO)
getservent
getsockname(SOCKET)
getsockopt(SOCKET,LEVEL,OPTNAME)
gmtime(EXPR)
goto LABEL
grep(EXPR,LIST)
... gt ...      String greater than.
hex(EXPR)
if (EXPR) { ... } [ elsif (EXPR) { ... } ... ] [ else { ... } ] or EXPR if EXPR
index(STR,SUBSTR[,OFFSET])
int(EXPR)
ioctl(FILEHANDLE,FUNCTION,SCALAR)
join(EXPR,LIST)
keys(%HASH)
kill(LIST)
last [LABEL]
... le ...      String less than or equal.
length(EXPR)
link(OLDFILE,NEWFILE)
listen(SOCKET,QUEUESIZE)
local(LIST)
localtime(EXPR)
log(EXPR)
lstat(EXPR|FILEHANDLE|VAR)
... lt ...      String less than.
m/PATTERN/iogsmx
mkdir(FILENAME,MODE)
msgctl(ID,CMD,ARG)
msgget(KEY,FLAGS)
msgrcv(ID,VAR,SIZE,TYPE.FLAGS)
msgsnd(ID,MSG,FLAGS)
my VAR or my (VAR1,...) Introduces a lexical variable ($VAR, @ARR, or %HASH).
... ne ...      String inequality.
next [LABEL]
oct(EXPR)
open(FILEHANDLE[,EXPR])
opendir(DIRHANDLE,EXPR)
ord(EXPR)
pack(TEMPLATE,LIST)
package NAME    Introduces package context.
pipe(READHANDLE,WRITEHANDLE)
pop(ARRAY)
print [FILEHANDLE] [(LIST)]
printf [FILEHANDLE] (FORMAT,LIST)
push(ARRAY,LIST)
q/STRING/       Synonym for 'STRING'
qq/STRING/      Synonym for \"STRING\"
qx/STRING/      Synonym for `STRING`
rand[(EXPR)]
read(FILEHANDLE,SCALAR,LENGTH[,OFFSET])
readdir(DIRHANDLE)
readlink(EXPR)
recv(SOCKET,SCALAR,LEN,FLAGS)
redo [LABEL]
rename(OLDNAME,NEWNAME)
require [FILENAME | PERL_VERSION]
reset[(EXPR)]
return(LIST)
reverse(LIST)
rewinddir(DIRHANDLE)
rindex(STR,SUBSTR[,OFFSET])
rmdir(FILENAME)
s/PATTERN/REPLACEMENT/gieoxsm
scalar(EXPR)
seek(FILEHANDLE,POSITION,WHENCE)
seekdir(DIRHANDLE,POS)
select(FILEHANDLE | RBITS,WBITS,EBITS,TIMEOUT)
semctl(ID,SEMNUM,CMD,ARG)
semget(KEY,NSEMS,SIZE,FLAGS)
semop(KEY,...)
send(SOCKET,MSG,FLAGS[,TO])
setgrent
sethostent(STAYOPEN)
setnetent(STAYOPEN)
setpgrp(PID,PGRP)
setpriority(WHICH,WHO,PRIORITY)
setprotoent(STAYOPEN)
setpwent
setservent(STAYOPEN)
setsockopt(SOCKET,LEVEL,OPTNAME,OPTVAL)
shift[(ARRAY)]
shmctl(ID,CMD,ARG)
shmget(KEY,SIZE,FLAGS)
shmread(ID,VAR,POS,SIZE)
shmwrite(ID,STRING,POS,SIZE)
shutdown(SOCKET,HOW)
sin(EXPR)
sleep[(EXPR)]
socket(SOCKET,DOMAIN,TYPE,PROTOCOL)
socketpair(SOCKET1,SOCKET2,DOMAIN,TYPE,PROTOCOL)
sort [SUBROUTINE] (LIST)
splice(ARRAY,OFFSET[,LENGTH[,LIST]])
split[(/PATTERN/[,EXPR[,LIMIT]])]
sprintf(FORMAT,LIST)
sqrt(EXPR)
srand(EXPR)
stat(EXPR|FILEHANDLE|VAR)
study[(SCALAR)]
sub [NAME [(format)]] { BODY }  sub NAME [(format)];    sub [(format)] {...}
substr(EXPR,OFFSET[,LEN])
symlink(OLDFILE,NEWFILE)
syscall(LIST)
sysread(FILEHANDLE,SCALAR,LENGTH[,OFFSET])
system(LIST)
syswrite(FILEHANDLE,SCALAR,LENGTH[,OFFSET])
tell[(FILEHANDLE)]
telldir(DIRHANDLE)
time
times
tr/SEARCHLIST/REPLACEMENTLIST/cds
truncate(FILE|EXPR,LENGTH)
umask[(EXPR)]
undef[(EXPR)]
unless (EXPR) { ... } [ else { ... } ] or EXPR unless EXPR
unlink(LIST)
unpack(TEMPLATE,EXPR)
unshift(ARRAY,LIST)
until (EXPR) { ... }                                    EXPR until EXPR
utime(LIST)
values(%HASH)
vec(EXPR,OFFSET,BITS)
wait
waitpid(PID,FLAGS)
wantarray
warn(LIST)
while  (EXPR) { ... }                                   EXPR while EXPR
write[(EXPR|FILEHANDLE)]
... x ...       Repeat string or array.
x= ...  Repetition assignment.
y/SEARCHLIST/REPLACEMENTLIST/
... | ...       Bitwise or.
... || ...      Logical or.
~ ...           Unary bitwise complement.
#!      OS interpreter indicator. If contains `perl', used for options, and -x.
AUTOLOAD {...}  Shorthand for `sub AUTOLOAD {...}'.
CORE::          Prefix to access builtin function if imported sub obscures it.
SUPER::         Prefix to lookup for a method in @ISA classes.
DESTROY         Shorthand for `sub DESTROY {...}'.
... EQ ...      Obsolete synonym of `eq'.
... GE ...      Obsolete synonym of `ge'.
... GT ...      Obsolete synonym of `gt'.
... LE ...      Obsolete synonym of `le'.
... LT ...      Obsolete synonym of `lt'.
... NE ...      Obsolete synonym of `ne'.
abs [ EXPR ]    absolute value
... and ...             Low-precedence synonym for &&.
bless REFERENCE [, PACKAGE]     Makes reference into an object of a package.
chomp           Docs missing
chr             Docs missing
else            Part of if/unless {BLOCK} elsif {BLOCK} else {BLOCK}.
elsif           Part of if/unless {BLOCK} elsif {BLOCK} else {BLOCK}.
exists  $HASH{KEY}      True if the key exists.
format          Docs missing
formline        Docs missing
glob EXPR       Synonym of <EXPR>.
lc [ EXPR ]     Returns lowercased EXPR.
lcfirst [ EXPR ]        Returns EXPR with lower-cased first letter.
map             Docs missing
no PACKAGE [SYMBOL1, ...]  Partial reverse for `use'. Runs `unimport' method.
... not ...             Low-precedence synonym for ! - negation.
... or ...              Low-precedence synonym for ||.
pos STRING    Set/Get end-position of the last match over this string, see \\G.
quotemeta [ EXPR ]      Quote metacharacters.
qw              Docs missing
readline FH     Synonym of <FH>.
readpipe CMD    Synonym of `CMD`.
ref [ EXPR ]    Type of EXPR when dereferenced.
sysopen         Docs missing
tie             Docs missing
tied            Docs missing
uc [ EXPR ]     Returns upcased EXPR.
ucfirst [ EXPR ]        Returns EXPR with upcased first letter.
untie           Docs missing
use PACKAGE [SYMBOL1, ...]  Compile-time `require' with consequent `import'.
... xor ...             Low-precedence synonym for exclusive or.
prototype \&SUB Returns prototype of the function given a reference.
=head1          Top-level heading.
=head2          Second-level heading.
=head3          Third-level heading (is there such?).
=over [ NUMBER ]        Start list.
=item [ TITLE ]         Start new item in the list.
=back           End list.
=cut            Switch from POD to Perl.
=pod            Switch from Perl to POD.
")

(defun cperl-switch-to-doc-buffer ()
  "Go to the perl documentation buffer and insert the documentation."
  (interactive)
  (let ((buf (get-buffer-create cperl-doc-buffer)))
    (if (interactive-p)
        (switch-to-buffer-other-window buf)
      (set-buffer buf))
    (if (= (buffer-size) 0)
        (progn
          (insert (documentation-property 'cperl-short-docs
                                          'variable-documentation))
          (setq buffer-read-only t)))))

(if (fboundp 'run-with-idle-timer)
    (progn
      (defvar cperl-help-shown nil
        "Non-nil means that the help was already shown now.")

      (defvar cperl-help-timer nil
        "Non-nil means that the help was already shown now.")

      (defun cperl-lazy-install ()
        (interactive)
        (make-variable-buffer-local 'cperl-help-shown)
        (if (cperl-val cperl-lazy-help-time)
            (progn
              (add-hook 'post-command-hook 'cperl-lazy-hook)
              (setq cperl-help-timer 
                    (run-with-idle-timer 
                     (cperl-val cperl-lazy-help-time 1000000 5) 
                     t 
                     'cperl-get-help-defer)))))

      (defun cperl-lazy-unstall ()
        (interactive)
        (remove-hook 'post-command-hook 'cperl-lazy-hook)
        (cancel-timer cperl-help-timer))

      (defun cperl-lazy-hook ()
        (setq cperl-help-shown nil))

      (defun cperl-get-help-defer ()
        (if (not (eq major-mode 'perl-mode)) nil
          (let ((cperl-message-on-help-error nil) (cperl-help-from-timer t))
            (cperl-get-help)
            (setq cperl-help-shown t))))
      (cperl-lazy-install)))