1 #############################################################################
2 # Pod/Find.pm -- finds files containing POD documentation
4 # Author: Marek Rouchal <marek@saftsack.fs.uni-bayreuth.de>
6 # Copyright (C) 1999-2000 by Marek Rouchal (and borrowing code
7 # from Nick Ing-Simmon's PodToHtml). All rights reserved.
8 # This file is part of "PodParser". Pod::Find is free software;
9 # you can redistribute it and/or modify it under the same terms
11 #############################################################################
15 use vars qw($VERSION);
16 $VERSION = 0.21; ## Current version of this package
17 require 5.005; ## requires this Perl version or later
20 #############################################################################
24 Pod::Find - find POD documents in directory trees
28 use Pod::Find qw(pod_find simplify_name);
29 my %pods = pod_find({ -verbose => 1, -inc => 1 });
31 print "found library POD `$pods{$_}' in $_\n";
34 print "podname=",simplify_name('a/b/c/mymodule.pod'),"\n";
36 $location = pod_where( { -inc => 1 }, "Pod::Find" );
40 B<Pod::Find> provides a set of functions to locate POD files. Note that
41 no function is exported by default to avoid pollution of your namespace,
42 so be sure to specify them in the B<use> statement if you need them:
44 use Pod::Find qw(pod_find);
55 use vars qw(@ISA @EXPORT_OK $VERSION);
57 @EXPORT_OK = qw(&pod_find &simplify_name &pod_where &contains_pod);
59 # package global variables
62 =head2 C<pod_find( { %opts } , @directories )>
64 The function B<pod_find> searches for POD documents in a given set of
65 files and/or directories. It returns a hash with the file names as keys
66 and the POD name as value. The POD name is derived from the file name
67 and its position in the directory tree.
69 E.g. when searching in F<$HOME/perl5lib>, the file
70 F<$HOME/perl5lib/MyModule.pm> would get the POD name I<MyModule>,
71 whereas F<$HOME/perl5lib/Myclass/Subclass.pm> would be
72 I<Myclass::Subclass>. The name information can be used for POD
75 Only text files containing at least one valid POD command are found.
77 A warning is printed if more than one POD file with the same POD name
78 is found, e.g. F<CPAN.pm> in different directories. This usually
79 indicates duplicate occurrences of modules in the I<@INC> search path.
81 B<OPTIONS> The first argument for B<pod_find> may be a hash reference
82 with options. The rest are either directories that are searched
83 recursively or files. The POD names of files are the plain basenames
84 with any Perl-like extension (.pm, .pl, .pod) stripped.
88 =item C<-verbose =E<gt> 1>
90 Print progress information while scanning.
92 =item C<-perl =E<gt> 1>
94 Apply Perl-specific heuristics to find the correct PODs. This includes
95 stripping Perl-like extensions, omitting subdirectories that are numeric
96 but do I<not> match the current Perl interpreter's version id, suppressing
97 F<site_perl> as a module hierarchy name etc.
99 =item C<-script =E<gt> 1>
101 Search for PODs in the current Perl interpreter's installation
102 B<scriptdir>. This is taken from the local L<Config|Config> module.
104 =item C<-inc =E<gt> 1>
106 Search for PODs in the current Perl interpreter's I<@INC> paths. This
107 automatically considers paths specified in the C<PERL5LIB> environment
108 as this is prepended to I<@INC> by the Perl interpreter itself.
114 # return a hash of the POD files found
115 # first argument may be a hashref (options),
116 # rest is a list of directories to search recursively
124 $opts{-verbose} ||= 0;
131 push(@search, $Config::Config{scriptdir});
136 push(@search, grep($_ ne '.',@INC));
142 # this code simplifies the POD name for Perl modules:
143 # * remove "site_perl"
144 # * remove e.g. "i586-linux" (from 'archname')
145 # * remove e.g. 5.00503
146 # * remove pod/ if followed by *.pod (e.g. in pod/perlfunc.pod)
148 qq!^(?i:site_perl/|\Q$Config::Config{archname}\E/|\\d+\\.\\d+([_.]?\\d+)?/|pod/(?=.*?\\.pod\\z))*!;
157 foreach my $try (@search) {
158 unless(File::Spec->file_name_is_absolute($try)) {
160 $try = File::Spec->catfile($pwd,$try);
163 # on VMS canonpath will vmsify:[the.path], but File::Find::find
165 $try = File::Spec->canonpath($try) if ($^O ne 'VMS');
168 if($name = _check_and_extract_name($try, $opts{-verbose})) {
169 _check_for_duplicates($try, $name, \%names, \%pods);
173 my $root_rx = qq!^\Q$try\E/!;
174 File::Find::find( sub {
175 my $item = $File::Find::name;
177 if($dirs_visited{$item}) {
178 warn "Directory '$item' already seen, skipping.\n"
180 $File::Find::prune = 1;
184 $dirs_visited{$item} = 1;
186 if($opts{-perl} && /^(\d+\.[\d_]+)\z/s && eval "$1" != $]) {
187 $File::Find::prune = 1;
188 warn "Perl $] version mismatch on $_, skipping.\n"
193 if($name = _check_and_extract_name($item, $opts{-verbose}, $root_rx)) {
194 _check_for_duplicates($item, $name, \%names, \%pods);
196 }, $try); # end of File::Find::find
202 sub _check_for_duplicates {
203 my ($file, $name, $names_ref, $pods_ref) = @_;
204 if($$names_ref{$name}) {
205 warn "Duplicate POD found (shadowing?): $name ($file)\n";
206 warn " Already seen in ",
207 join(' ', grep($$pods_ref{$_} eq $name, keys %$pods_ref)),"\n";
210 $$names_ref{$name} = 1;
212 $$pods_ref{$file} = $name;
215 sub _check_and_extract_name {
216 my ($file, $verbose, $root_rx) = @_;
218 # check extension or executable flag
219 # this involves testing the .bat extension on Win32!
220 unless(-f $file && -T _ && ($file =~ /\.(pod|pm|plx?)\z/i || -x _ )) {
224 return undef unless contains_pod($file,$verbose);
226 # strip non-significant path components
227 # TODO what happens on e.g. Win32?
229 if(defined $root_rx) {
230 $name =~ s!$root_rx!!s;
231 $name =~ s!$SIMPLIFY_RX!!os if(defined $SIMPLIFY_RX);
237 $name =~ s!/+!::!g; #/
241 =head2 C<simplify_name( $str )>
243 The function B<simplify_name> is equivalent to B<basename>, but also
244 strips Perl-like extensions (.pm, .pl, .pod) and extensions like
245 F<.bat>, F<.cmd> on Win32 and OS/2, or F<.com> on VMS, respectively.
249 # basic simplification of the POD name:
250 # basename & strip extension
253 # remove all path components
261 # strip Perl's own extensions
262 $_[0] =~ s/\.(pod|pm|plx?)\z//i;
263 # strip meaningless extensions on Win32 and OS/2
264 $_[0] =~ s/\.(bat|exe|cmd)\z//i if($^O =~ /win|os2/i);
265 # strip meaningless extensions on VMS
266 $_[0] =~ s/\.(com)\z//i if($^O eq 'VMS');
269 # contribution from Tim Jenness <t.jenness@jach.hawaii.edu>
271 =head2 C<pod_where( { %opts }, $pod )>
273 Returns the location of a pod document given a search directory
274 and a module (e.g. C<File::Find>) or script (e.g. C<perldoc>) name.
280 =item C<-inc =E<gt> 1>
282 Search @INC for the pod and also the C<scriptdir> defined in the
283 L<Config|Config> module.
285 =item C<-dirs =E<gt> [ $dir1, $dir2, ... ]>
287 Reference to an array of search directories. These are searched in order
288 before looking in C<@INC> (if B<-inc>). Current directory is used if
291 =item C<-verbose =E<gt> 1>
293 List directories as they are searched
297 Returns the full path of the first occurence to the file.
298 Package names (eg 'A::B') are automatically converted to directory
299 names in the selected directory. (eg on unix 'A::B' is converted to
300 'A/B'). Additionally, '.pm', '.pl' and '.pod' are appended to the
301 search automatically if required.
303 A subdirectory F<pod/> is also checked if it exists in any of the given
304 search directories. This ensures that e.g. L<perlfunc|perlfunc> is
307 It is assumed that if a module name is supplied, that that name
308 matches the file name. Pods are not opened to check for the 'NAME'
311 A check is made to make sure that the file that is found does
312 contain some pod documentation.
325 # Check for an options hash as first argument
326 if (defined $_[0] && ref($_[0]) eq 'HASH') {
329 # Merge default options with supplied options
330 %options = (%options, %$opt);
334 carp 'Usage: pod_where({options}, $pod)' unless (scalar(@_));
339 # Split on :: and then join the name together using File::Spec
340 my @parts = split (/::/, $pod);
342 # Get full directory list
343 my @search_dirs = @{ $options{'-dirs'} };
345 if ($options{'-inc'}) {
350 push (@search_dirs, @INC) if $options{'-inc'};
352 # Add location of pod documentation for perl man pages (eg perlfunc)
353 # This is a pod directory in the private install tree
354 #my $perlpoddir = File::Spec->catdir($Config::Config{'installprivlib'},
356 #push (@search_dirs, $perlpoddir)
359 # Add location of binaries such as pod2text
360 push (@search_dirs, $Config::Config{'scriptdir'})
361 if -d $Config::Config{'scriptdir'};
364 # Loop over directories
365 Dir: foreach my $dir ( @search_dirs ) {
367 # Don't bother if cant find the directory
369 warn "Looking in directory $dir\n"
370 if $options{'-verbose'};
372 # Now concatenate this directory with the pod we are searching for
373 my $fullname = File::Spec->catfile($dir, @parts);
374 warn "Filename is now $fullname\n"
375 if $options{'-verbose'};
377 # Loop over possible extensions
378 foreach my $ext ('', '.pod', '.pm', '.pl') {
379 my $fullext = $fullname . $ext;
381 contains_pod($fullext, $options{'-verbose'}) ) {
382 warn "FOUND: $fullext\n" if $options{'-verbose'};
387 warn "Directory $dir does not exist\n"
388 if $options{'-verbose'};
391 if(-d File::Spec->catdir($dir,'pod')) {
392 $dir = File::Spec->catdir($dir,'pod');
400 =head2 C<contains_pod( $file , $verbose )>
402 Returns true if the supplied filename (not POD module) contains some pod
410 $verbose = shift if @_;
412 # check for one line of POD
413 unless(open(POD,"<$file")) {
414 warn "Error: $file is unreadable: $!\n";
420 close(POD) || die "Error closing $file: $!\n";
421 unless($pod =~ /\n=(head\d|pod|over|item)\b/s) {
422 warn "No POD in $file, skipping.\n"
432 Marek Rouchal E<lt>marek@saftsack.fs.uni-bayreuth.deE<gt>,
433 heavily borrowing code from Nick Ing-Simmons' PodToHtml.
435 Tim Jenness E<lt>t.jenness@jach.hawaii.eduE<gt> provided
436 C<pod_where> and C<contains_pod>.
440 L<Pod::Parser>, L<Pod::Checker>, L<perldoc>