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1 | ############################################################################# |
2 | # Pod/Find.pm -- finds files containing POD documentation |
3 | # |
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4 | # Author: Marek Rouchal <marekr@cpan.org> |
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5 | # |
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6 | # Copyright (C) 1999-2000 by Marek Rouchal (and borrowing code |
7 | # from Nick Ing-Simmon's PodToHtml). All rights reserved. |
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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 |
10 | # as Perl itself. |
11 | ############################################################################# |
12 | |
13 | package Pod::Find; |
14 | |
15 | use vars qw($VERSION); |
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16 | $VERSION = 0.24_01; ## Current version of this package |
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17 | require 5.005; ## requires this Perl version or later |
18 | use Carp; |
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19 | |
20 | ############################################################################# |
21 | |
22 | =head1 NAME |
23 | |
24 | Pod::Find - find POD documents in directory trees |
25 | |
26 | =head1 SYNOPSIS |
27 | |
28 | use Pod::Find qw(pod_find simplify_name); |
29 | my %pods = pod_find({ -verbose => 1, -inc => 1 }); |
30 | foreach(keys %pods) { |
31 | print "found library POD `$pods{$_}' in $_\n"; |
32 | } |
33 | |
34 | print "podname=",simplify_name('a/b/c/mymodule.pod'),"\n"; |
35 | |
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36 | $location = pod_where( { -inc => 1 }, "Pod::Find" ); |
37 | |
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38 | =head1 DESCRIPTION |
39 | |
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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: |
43 | |
44 | use Pod::Find qw(pod_find); |
45 | |
46 | =cut |
47 | |
48 | use strict; |
49 | #use diagnostics; |
50 | use Exporter; |
51 | use File::Spec; |
52 | use File::Find; |
53 | use Cwd; |
54 | |
55 | use vars qw(@ISA @EXPORT_OK $VERSION); |
56 | @ISA = qw(Exporter); |
57 | @EXPORT_OK = qw(&pod_find &simplify_name &pod_where &contains_pod); |
58 | |
59 | # package global variables |
60 | my $SIMPLIFY_RX; |
61 | |
62 | =head2 C<pod_find( { %opts } , @directories )> |
63 | |
64 | The function B<pod_find> searches for POD documents in a given set of |
65 | files and/or directories. It returns a hash with the file names as keys |
66 | and the POD name as value. The POD name is derived from the file name |
67 | and its position in the directory tree. |
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68 | |
69 | E.g. when searching in F<$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 |
73 | translators. |
74 | |
75 | Only text files containing at least one valid POD command are found. |
76 | |
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 |
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79 | indicates duplicate occurrences of modules in the I<@INC> search path. |
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80 | |
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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. |
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85 | |
86 | =over 4 |
87 | |
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88 | =item C<-verbose =E<gt> 1> |
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89 | |
90 | Print progress information while scanning. |
91 | |
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92 | =item C<-perl =E<gt> 1> |
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93 | |
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. |
98 | |
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99 | =item C<-script =E<gt> 1> |
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100 | |
101 | Search for PODs in the current Perl interpreter's installation |
102 | B<scriptdir>. This is taken from the local L<Config|Config> module. |
103 | |
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104 | =item C<-inc =E<gt> 1> |
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105 | |
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106 | Search for PODs in the current Perl interpreter's I<@INC> paths. This |
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107 | automatically considers paths specified in the C<PERL5LIB> environment |
108 | as this is prepended to I<@INC> by the Perl interpreter itself. |
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109 | |
110 | =back |
111 | |
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112 | =cut |
113 | |
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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 |
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117 | sub pod_find |
118 | { |
119 | my %opts; |
120 | if(ref $_[0]) { |
121 | %opts = %{shift()}; |
122 | } |
123 | |
124 | $opts{-verbose} ||= 0; |
125 | $opts{-perl} ||= 0; |
126 | |
127 | my (@search) = @_; |
128 | |
129 | if($opts{-script}) { |
130 | require Config; |
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131 | push(@search, $Config::Config{scriptdir}) |
132 | if -d $Config::Config{scriptdir}; |
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133 | $opts{-perl} = 1; |
134 | } |
135 | |
136 | if($opts{-inc}) { |
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137 | if ($^O eq 'MacOS') { |
138 | # tolerate '.', './some_dir' and '(../)+some_dir' on Mac OS |
139 | my @new_INC = @INC; |
140 | for (@new_INC) { |
141 | if ( $_ eq '.' ) { |
142 | $_ = ':'; |
143 | } elsif ( $_ =~ s|^((?:\.\./)+)|':' x (length($1)/3)|e ) { |
144 | $_ = ':'. $_; |
145 | } else { |
146 | $_ =~ s|^\./|:|; |
147 | } |
148 | } |
149 | push(@search, grep($_ ne File::Spec->curdir, @new_INC)); |
150 | } else { |
151 | push(@search, grep($_ ne File::Spec->curdir, @INC)); |
152 | } |
153 | |
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154 | $opts{-perl} = 1; |
155 | } |
156 | |
157 | if($opts{-perl}) { |
158 | require Config; |
159 | # this code simplifies the POD name for Perl modules: |
160 | # * remove "site_perl" |
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161 | # * remove e.g. "i586-linux" (from 'archname') |
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162 | # * remove e.g. 5.00503 |
163 | # * remove pod/ if followed by *.pod (e.g. in pod/perlfunc.pod) |
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164 | |
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165 | # Mac OS: |
166 | # * remove ":?site_perl:" |
167 | # * remove :?pod: if followed by *.pod (e.g. in :pod:perlfunc.pod) |
168 | |
169 | if ($^O eq 'MacOS') { |
170 | $SIMPLIFY_RX = |
171 | qq!^(?i:\:?site_perl\:|\:?pod\:(?=.*?\\.pod\\z))*!; |
172 | } else { |
173 | $SIMPLIFY_RX = |
174 | qq!^(?i:site(_perl)?/|\Q$Config::Config{archname}\E/|\\d+\\.\\d+([_.]?\\d+)?/|pod/(?=.*?\\.pod\\z))*!; |
175 | } |
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176 | } |
177 | |
178 | my %dirs_visited; |
179 | my %pods; |
180 | my %names; |
181 | my $pwd = cwd(); |
182 | |
183 | foreach my $try (@search) { |
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184 | unless(File::Spec->file_name_is_absolute($try)) { |
185 | # make path absolute |
186 | $try = File::Spec->catfile($pwd,$try); |
187 | } |
188 | # simplify path |
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189 | # on VMS canonpath will vmsify:[the.path], but File::Find::find |
190 | # wants /unixy/paths |
191 | $try = File::Spec->canonpath($try) if ($^O ne 'VMS'); |
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192 | $try = VMS::Filespec::unixify($try) if ($^O eq 'VMS'); |
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193 | my $name; |
194 | if(-f $try) { |
195 | if($name = _check_and_extract_name($try, $opts{-verbose})) { |
196 | _check_for_duplicates($try, $name, \%names, \%pods); |
197 | } |
198 | next; |
199 | } |
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200 | my $root_rx = $^O eq 'MacOS' ? qq!^\Q$try\E! : qq!^\Q$try\E/!; |
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201 | File::Find::find( sub { |
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202 | my $item = $File::Find::name; |
203 | if(-d) { |
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204 | if($item =~ m{/(?:RCS|CVS|SCCS|\.svn)$}) { |
205 | $File::Find::prune = 1; |
206 | return; |
207 | } |
208 | elsif($dirs_visited{$item}) { |
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209 | warn "Directory '$item' already seen, skipping.\n" |
210 | if($opts{-verbose}); |
211 | $File::Find::prune = 1; |
212 | return; |
213 | } |
214 | else { |
215 | $dirs_visited{$item} = 1; |
216 | } |
217 | if($opts{-perl} && /^(\d+\.[\d_]+)\z/s && eval "$1" != $]) { |
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218 | $File::Find::prune = 1; |
219 | warn "Perl $] version mismatch on $_, skipping.\n" |
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220 | if($opts{-verbose}); |
221 | } |
222 | return; |
223 | } |
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224 | if($name = _check_and_extract_name($item, $opts{-verbose}, $root_rx)) { |
225 | _check_for_duplicates($item, $name, \%names, \%pods); |
226 | } |
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227 | }, $try); # end of File::Find::find |
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228 | } |
229 | chdir $pwd; |
230 | %pods; |
231 | } |
232 | |
233 | sub _check_for_duplicates { |
234 | my ($file, $name, $names_ref, $pods_ref) = @_; |
235 | if($$names_ref{$name}) { |
236 | warn "Duplicate POD found (shadowing?): $name ($file)\n"; |
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237 | warn " Already seen in ", |
238 | join(' ', grep($$pods_ref{$_} eq $name, keys %$pods_ref)),"\n"; |
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239 | } |
240 | else { |
241 | $$names_ref{$name} = 1; |
242 | } |
243 | $$pods_ref{$file} = $name; |
244 | } |
245 | |
246 | sub _check_and_extract_name { |
247 | my ($file, $verbose, $root_rx) = @_; |
248 | |
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249 | # check extension or executable flag |
250 | # this involves testing the .bat extension on Win32! |
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251 | unless(-f $file && -T _ && ($file =~ /\.(pod|pm|plx?)\z/i || -x _ )) { |
252 | return undef; |
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253 | } |
254 | |
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255 | return undef unless contains_pod($file,$verbose); |
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256 | |
257 | # strip non-significant path components |
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258 | # TODO what happens on e.g. Win32? |
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259 | my $name = $file; |
260 | if(defined $root_rx) { |
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261 | $name =~ s!$root_rx!!s; |
262 | $name =~ s!$SIMPLIFY_RX!!os if(defined $SIMPLIFY_RX); |
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263 | } |
264 | else { |
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265 | if ($^O eq 'MacOS') { |
266 | $name =~ s/^.*://s; |
267 | } else { |
268 | $name =~ s:^.*/::s; |
269 | } |
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270 | } |
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271 | _simplify($name); |
272 | $name =~ s!/+!::!g; #/ |
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273 | if ($^O eq 'MacOS') { |
274 | $name =~ s!:+!::!g; # : -> :: |
275 | } else { |
276 | $name =~ s!/+!::!g; # / -> :: |
277 | } |
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278 | $name; |
279 | } |
280 | |
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281 | =head2 C<simplify_name( $str )> |
282 | |
283 | The function B<simplify_name> is equivalent to B<basename>, but also |
284 | strips Perl-like extensions (.pm, .pl, .pod) and extensions like |
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285 | F<.bat>, F<.cmd> on Win32 and OS/2, or F<.com> on VMS, respectively. |
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286 | |
287 | =cut |
288 | |
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289 | # basic simplification of the POD name: |
290 | # basename & strip extension |
291 | sub simplify_name { |
292 | my ($str) = @_; |
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293 | # remove all path components |
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294 | if ($^O eq 'MacOS') { |
295 | $str =~ s/^.*://s; |
296 | } else { |
297 | $str =~ s:^.*/::s; |
298 | } |
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299 | _simplify($str); |
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300 | $str; |
301 | } |
302 | |
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303 | # internal sub only |
304 | sub _simplify { |
305 | # strip Perl's own extensions |
306 | $_[0] =~ s/\.(pod|pm|plx?)\z//i; |
307 | # strip meaningless extensions on Win32 and OS/2 |
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308 | $_[0] =~ s/\.(bat|exe|cmd)\z//i if($^O =~ /mswin|os2/i); |
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309 | # strip meaningless extensions on VMS |
310 | $_[0] =~ s/\.(com)\z//i if($^O eq 'VMS'); |
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311 | } |
312 | |
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313 | # contribution from Tim Jenness <t.jenness@jach.hawaii.edu> |
314 | |
315 | =head2 C<pod_where( { %opts }, $pod )> |
316 | |
317 | Returns the location of a pod document given a search directory |
318 | and a module (e.g. C<File::Find>) or script (e.g. C<perldoc>) name. |
319 | |
320 | Options: |
321 | |
322 | =over 4 |
323 | |
324 | =item C<-inc =E<gt> 1> |
325 | |
326 | Search @INC for the pod and also the C<scriptdir> defined in the |
327 | L<Config|Config> module. |
328 | |
329 | =item C<-dirs =E<gt> [ $dir1, $dir2, ... ]> |
330 | |
331 | Reference to an array of search directories. These are searched in order |
332 | before looking in C<@INC> (if B<-inc>). Current directory is used if |
333 | none are specified. |
334 | |
335 | =item C<-verbose =E<gt> 1> |
336 | |
337 | List directories as they are searched |
338 | |
339 | =back |
340 | |
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341 | Returns the full path of the first occurrence to the file. |
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342 | Package names (eg 'A::B') are automatically converted to directory |
343 | names in the selected directory. (eg on unix 'A::B' is converted to |
344 | 'A/B'). Additionally, '.pm', '.pl' and '.pod' are appended to the |
345 | search automatically if required. |
346 | |
347 | A subdirectory F<pod/> is also checked if it exists in any of the given |
348 | search directories. This ensures that e.g. L<perlfunc|perlfunc> is |
349 | found. |
350 | |
351 | It is assumed that if a module name is supplied, that that name |
352 | matches the file name. Pods are not opened to check for the 'NAME' |
353 | entry. |
354 | |
355 | A check is made to make sure that the file that is found does |
356 | contain some pod documentation. |
357 | |
358 | =cut |
359 | |
360 | sub pod_where { |
361 | |
362 | # default options |
363 | my %options = ( |
364 | '-inc' => 0, |
365 | '-verbose' => 0, |
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366 | '-dirs' => [ File::Spec->curdir ], |
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367 | ); |
368 | |
369 | # Check for an options hash as first argument |
370 | if (defined $_[0] && ref($_[0]) eq 'HASH') { |
371 | my $opt = shift; |
372 | |
373 | # Merge default options with supplied options |
374 | %options = (%options, %$opt); |
375 | } |
376 | |
377 | # Check usage |
378 | carp 'Usage: pod_where({options}, $pod)' unless (scalar(@_)); |
379 | |
380 | # Read argument |
381 | my $pod = shift; |
382 | |
383 | # Split on :: and then join the name together using File::Spec |
384 | my @parts = split (/::/, $pod); |
385 | |
386 | # Get full directory list |
387 | my @search_dirs = @{ $options{'-dirs'} }; |
388 | |
389 | if ($options{'-inc'}) { |
390 | |
391 | require Config; |
392 | |
393 | # Add @INC |
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394 | if ($^O eq 'MacOS' && $options{'-inc'}) { |
395 | # tolerate '.', './some_dir' and '(../)+some_dir' on Mac OS |
396 | my @new_INC = @INC; |
397 | for (@new_INC) { |
398 | if ( $_ eq '.' ) { |
399 | $_ = ':'; |
400 | } elsif ( $_ =~ s|^((?:\.\./)+)|':' x (length($1)/3)|e ) { |
401 | $_ = ':'. $_; |
402 | } else { |
403 | $_ =~ s|^\./|:|; |
404 | } |
405 | } |
406 | push (@search_dirs, @new_INC); |
407 | } elsif ($options{'-inc'}) { |
408 | push (@search_dirs, @INC); |
409 | } |
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410 | |
411 | # Add location of pod documentation for perl man pages (eg perlfunc) |
412 | # This is a pod directory in the private install tree |
413 | #my $perlpoddir = File::Spec->catdir($Config::Config{'installprivlib'}, |
414 | # 'pod'); |
415 | #push (@search_dirs, $perlpoddir) |
416 | # if -d $perlpoddir; |
417 | |
418 | # Add location of binaries such as pod2text |
419 | push (@search_dirs, $Config::Config{'scriptdir'}) |
420 | if -d $Config::Config{'scriptdir'}; |
421 | } |
422 | |
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423 | warn "Search path is: ".join(' ', @search_dirs)."\n" |
424 | if $options{'-verbose'}; |
425 | |
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426 | # Loop over directories |
427 | Dir: foreach my $dir ( @search_dirs ) { |
428 | |
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429 | # Don't bother if can't find the directory |
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430 | if (-d $dir) { |
431 | warn "Looking in directory $dir\n" |
432 | if $options{'-verbose'}; |
433 | |
434 | # Now concatenate this directory with the pod we are searching for |
435 | my $fullname = File::Spec->catfile($dir, @parts); |
436 | warn "Filename is now $fullname\n" |
437 | if $options{'-verbose'}; |
438 | |
439 | # Loop over possible extensions |
440 | foreach my $ext ('', '.pod', '.pm', '.pl') { |
441 | my $fullext = $fullname . $ext; |
442 | if (-f $fullext && |
443 | contains_pod($fullext, $options{'-verbose'}) ) { |
444 | warn "FOUND: $fullext\n" if $options{'-verbose'}; |
445 | return $fullext; |
446 | } |
447 | } |
448 | } else { |
449 | warn "Directory $dir does not exist\n" |
450 | if $options{'-verbose'}; |
451 | next Dir; |
452 | } |
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453 | # for some strange reason the path on MacOS/darwin/cygwin is |
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454 | # 'pods' not 'pod' |
455 | # this could be the case also for other systems that |
456 | # have a case-tolerant file system, but File::Spec |
c23d1eb0 |
457 | # does not recognize 'darwin' yet. And cygwin also has "pods", |
458 | # but is not case tolerant. Oh well... |
459 | if((File::Spec->case_tolerant || $^O =~ /macos|darwin|cygwin/i) |
460 | && -d File::Spec->catdir($dir,'pods')) { |
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461 | $dir = File::Spec->catdir($dir,'pods'); |
462 | redo Dir; |
463 | } |
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464 | if(-d File::Spec->catdir($dir,'pod')) { |
465 | $dir = File::Spec->catdir($dir,'pod'); |
466 | redo Dir; |
467 | } |
468 | } |
469 | # No match; |
470 | return undef; |
471 | } |
472 | |
473 | =head2 C<contains_pod( $file , $verbose )> |
474 | |
475 | Returns true if the supplied filename (not POD module) contains some pod |
476 | information. |
477 | |
478 | =cut |
479 | |
480 | sub contains_pod { |
481 | my $file = shift; |
482 | my $verbose = 0; |
483 | $verbose = shift if @_; |
484 | |
485 | # check for one line of POD |
486 | unless(open(POD,"<$file")) { |
487 | warn "Error: $file is unreadable: $!\n"; |
488 | return undef; |
489 | } |
490 | |
491 | local $/ = undef; |
492 | my $pod = <POD>; |
493 | close(POD) || die "Error closing $file: $!\n"; |
494 | unless($pod =~ /\n=(head\d|pod|over|item)\b/s) { |
495 | warn "No POD in $file, skipping.\n" |
496 | if($verbose); |
497 | return 0; |
498 | } |
499 | |
500 | return 1; |
501 | } |
502 | |
503 | =head1 AUTHOR |
504 | |
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505 | Please report bugs using L<http://rt.cpan.org>. |
506 | |
507 | Marek Rouchal E<lt>marekr@cpan.orgE<gt>, |
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508 | heavily borrowing code from Nick Ing-Simmons' PodToHtml. |
509 | |
510 | Tim Jenness E<lt>t.jenness@jach.hawaii.eduE<gt> provided |
511 | C<pod_where> and C<contains_pod>. |
512 | |
513 | =head1 SEE ALSO |
514 | |
515 | L<Pod::Parser>, L<Pod::Checker>, L<perldoc> |
516 | |
517 | =cut |
518 | |
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519 | 1; |
520 | |