lib/perl5/5.8.8/Pod/Find.pm

   1 #############################################################################
   2 # Pod/Find.pm -- finds files containing POD documentation
   3 #
   4 # Author: Marek Rouchal <marekr@cpan.org>
   5 #
   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
  10 # as Perl itself.
  11 #############################################################################
  12
  13 package Pod::Find;
  14
  15 use vars qw($VERSION);
  16 $VERSION = 1.34;   ## Current version of this package
  17 require  5.005;   ## requires this Perl version or later
  18 use Carp;
  19
  20 #############################################################################
  21
  22 =head1 NAME
  23
  24 Pod::Find - find POD documents in directory trees
  25
  26 =head1 SYNOPSIS
  27
  28   use Pod::Find qw(pod_find simplify_name);
  29   my %pods = pod_find({ -verbose => 1, -inc => 1 });
  30   foreach(keys %pods) {
  31      print "found library POD `$pods{$_}' in $_\n";
  32   }
  33
  34   print "podname=",simplify_name('a/b/c/mymodule.pod'),"\n";
  35
  36   $location = pod_where( { -inc => 1 }, "Pod::Find" );
  37
  38 =head1 DESCRIPTION
  39
  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 From this version on the typical SCM (software configuration management)
  47 files/directories like RCS, CVS, SCCS, .svn are ignored.
  48
  49 =cut
  50
  51 use strict;
  52 #use diagnostics;
  53 use Exporter;
  54 use File::Spec;
  55 use File::Find;
  56 use Cwd;
  57
  58 use vars qw(@ISA @EXPORT_OK $VERSION);
  59 @ISA = qw(Exporter);
  60 @EXPORT_OK = qw(&pod_find &simplify_name &pod_where &contains_pod);
  61
  62 # package global variables
  63 my $SIMPLIFY_RX;
  64
  65 =head2 C<pod_find( { %opts } , @directories )>
  66
  67 The function B<pod_find> searches for POD documents in a given set of
  68 files and/or directories. It returns a hash with the file names as keys
  69 and the POD name as value. The POD name is derived from the file name
  70 and its position in the directory tree.
  71
  72 E.g. when searching in F<$HOME/perl5lib>, the file
  73 F<$HOME/perl5lib/MyModule.pm> would get the POD name I<MyModule>,
  74 whereas F<$HOME/perl5lib/Myclass/Subclass.pm> would be
  75 I<Myclass::Subclass>. The name information can be used for POD
  76 translators.
  77
  78 Only text files containing at least one valid POD command are found.
  79
  80 A warning is printed if more than one POD file with the same POD name
  81 is found, e.g. F<CPAN.pm> in different directories. This usually
  82 indicates duplicate occurrences of modules in the I<@INC> search path.
  83
  84 B<OPTIONS> The first argument for B<pod_find> may be a hash reference
  85 with options. The rest are either directories that are searched
  86 recursively or files.  The POD names of files are the plain basenames
  87 with any Perl-like extension (.pm, .pl, .pod) stripped.
  88
  89 =over 4
  90
  91 =item C<-verbose =E<gt> 1>
  92
  93 Print progress information while scanning.
  94
  95 =item C<-perl =E<gt> 1>
  96
  97 Apply Perl-specific heuristics to find the correct PODs. This includes
  98 stripping Perl-like extensions, omitting subdirectories that are numeric
  99 but do I<not> match the current Perl interpreter's version id, suppressing
 100 F<site_perl> as a module hierarchy name etc.
 101
 102 =item C<-script =E<gt> 1>
 103
 104 Search for PODs in the current Perl interpreter's installation
 105 B<scriptdir>. This is taken from the local L<Config|Config> module.
 106
 107 =item C<-inc =E<gt> 1>
 108
 109 Search for PODs in the current Perl interpreter's I<@INC> paths. This
 110 automatically considers paths specified in the C<PERL5LIB> environment
 111 as this is prepended to I<@INC> by the Perl interpreter itself.
 112
 113 =back
 114
 115 =cut
 116
 117 # return a hash of the POD files found
 118 # first argument may be a hashref (options),
 119 # rest is a list of directories to search recursively
 120 sub pod_find
 121 {
 122     my %opts;
 123     if(ref $_[0]) {
 124         %opts = %{shift()};
 125     }
 126
 127     $opts{-verbose} ||= 0;
 128     $opts{-perl}    ||= 0;
 129
 130     my (@search) = @_;
 131
 132     if($opts{-script}) {
 133         require Config;
 134         push(@search, $Config::Config{scriptdir})
 135             if -d $Config::Config{scriptdir};
 136         $opts{-perl} = 1;
 137     }
 138
 139     if($opts{-inc}) {
 140         if ($^O eq 'MacOS') {
 141             # tolerate '.', './some_dir' and '(../)+some_dir' on Mac OS
 142             my @new_INC = @INC;
 143             for (@new_INC) {
 144                 if ( $_ eq '.' ) {
 145                     $_ = ':';
 146                 } elsif ( $_ =~ s|^((?:\.\./)+)|':' x (length($1)/3)|e ) {
 147                     $_ = ':'. $_;
 148                 } else {
 149                     $_ =~ s|^\./|:|;
 150                 }
 151             }
 152             push(@search, grep($_ ne File::Spec->curdir, @new_INC));
 153         } else {
 154             push(@search, grep($_ ne File::Spec->curdir, @INC));
 155         }
 156
 157         $opts{-perl} = 1;
 158     }
 159
 160     if($opts{-perl}) {
 161         require Config;
 162         # this code simplifies the POD name for Perl modules:
 163         # * remove "site_perl"
 164         # * remove e.g. "i586-linux" (from 'archname')
 165         # * remove e.g. 5.00503
 166         # * remove pod/ if followed by *.pod (e.g. in pod/perlfunc.pod)
 167
 168         # Mac OS:
 169         # * remove ":?site_perl:"
 170         # * remove :?pod: if followed by *.pod (e.g. in :pod:perlfunc.pod)
 171
 172         if ($^O eq 'MacOS') {
 173             $SIMPLIFY_RX =
 174               qq!^(?i:\:?site_perl\:|\:?pod\:(?=.*?\\.pod\\z))*!;
 175         } else {
 176             $SIMPLIFY_RX =
 177               qq!^(?i:site(_perl)?/|\Q$Config::Config{archname}\E/|\\d+\\.\\d+([_.]?\\d+)?/|pod/(?=.*?\\.pod\\z))*!;
 178         }
 179     }
 180
 181     my %dirs_visited;
 182     my %pods;
 183     my %names;
 184     my $pwd = cwd();
 185
 186     foreach my $try (@search) {
 187         unless(File::Spec->file_name_is_absolute($try)) {
 188             # make path absolute
 189             $try = File::Spec->catfile($pwd,$try);
 190         }
 191         # simplify path
 192         # on VMS canonpath will vmsify:[the.path], but File::Find::find
 193         # wants /unixy/paths
 194         $try = File::Spec->canonpath($try) if ($^O ne 'VMS');
 195         $try = VMS::Filespec::unixify($try) if ($^O eq 'VMS');
 196         my $name;
 197         if(-f $try) {
 198             if($name = _check_and_extract_name($try, $opts{-verbose})) {
 199                 _check_for_duplicates($try, $name, \%names, \%pods);
 200             }
 201             next;
 202         }
 203         my $root_rx = $^O eq 'MacOS' ? qq!^\Q$try\E! : qq!^\Q$try\E/!;
 204         File::Find::find( sub {
 205             my $item = $File::Find::name;
 206             if(-d) {
 207                 if($item =~ m{/(?:RCS|CVS|SCCS|\.svn)$}) {
 208                     $File::Find::prune = 1;
 209                     return;
 210                 }
 211                 elsif($dirs_visited{$item}) {
 212                     warn "Directory '$item' already seen, skipping.\n"
 213                         if($opts{-verbose});
 214                     $File::Find::prune = 1;
 215                     return;
 216                 }
 217                 else {
 218                     $dirs_visited{$item} = 1;
 219                 }
 220                 if($opts{-perl} && /^(\d+\.[\d_]+)\z/s && eval "$1" != $]) {
 221                     $File::Find::prune = 1;
 222                     warn "Perl $] version mismatch on $_, skipping.\n"
 223                         if($opts{-verbose});
 224                 }
 225                 return;
 226             }
 227             if($name = _check_and_extract_name($item, $opts{-verbose}, $root_rx)) {
 228                 _check_for_duplicates($item, $name, \%names, \%pods);
 229             }
 230         }, $try); # end of File::Find::find
 231     }
 232     chdir $pwd;
 233     %pods;
 234 }
 235
 236 sub _check_for_duplicates {
 237     my ($file, $name, $names_ref, $pods_ref) = @_;
 238     if($$names_ref{$name}) {
 239         warn "Duplicate POD found (shadowing?): $name ($file)\n";
 240         warn "    Already seen in ",
 241             join(' ', grep($$pods_ref{$_} eq $name, keys %$pods_ref)),"\n";
 242     }
 243     else {
 244         $$names_ref{$name} = 1;
 245     }
 246     $$pods_ref{$file} = $name;
 247 }
 248
 249 sub _check_and_extract_name {
 250     my ($file, $verbose, $root_rx) = @_;
 251
 252     # check extension or executable flag
 253     # this involves testing the .bat extension on Win32!
 254     unless(-f $file && -T $file && ($file =~ /\.(pod|pm|plx?)\z/i || -x $file )) {
 255       return undef;
 256     }
 257
 258     return undef unless contains_pod($file,$verbose);
 259
 260     # strip non-significant path components
 261     # TODO what happens on e.g. Win32?
 262     my $name = $file;
 263     if(defined $root_rx) {
 264         $name =~ s!$root_rx!!s;
 265         $name =~ s!$SIMPLIFY_RX!!os if(defined $SIMPLIFY_RX);
 266     }
 267     else {
 268         if ($^O eq 'MacOS') {
 269             $name =~ s/^.*://s;
 270         } else {
 271             $name =~ s:^.*/::s;
 272         }
 273     }
 274     _simplify($name);
 275     $name =~ s!/+!::!g; #/
 276     if ($^O eq 'MacOS') {
 277         $name =~ s!:+!::!g; # : -> ::
 278     } else {
 279         $name =~ s!/+!::!g; # / -> ::
 280     }
 281     $name;
 282 }
 283
 284 =head2 C<simplify_name( $str )>
 285
 286 The function B<simplify_name> is equivalent to B<basename>, but also
 287 strips Perl-like extensions (.pm, .pl, .pod) and extensions like
 288 F<.bat>, F<.cmd> on Win32 and OS/2, or F<.com> on VMS, respectively.
 289
 290 =cut
 291
 292 # basic simplification of the POD name:
 293 # basename & strip extension
 294 sub simplify_name {
 295     my ($str) = @_;
 296     # remove all path components
 297     if ($^O eq 'MacOS') {
 298         $str =~ s/^.*://s;
 299     } else {
 300         $str =~ s:^.*/::s;
 301     }
 302     _simplify($str);
 303     $str;
 304 }
 305
 306 # internal sub only
 307 sub _simplify {
 308     # strip Perl's own extensions
 309     $_[0] =~ s/\.(pod|pm|plx?)\z//i;
 310     # strip meaningless extensions on Win32 and OS/2
 311     $_[0] =~ s/\.(bat|exe|cmd)\z//i if($^O =~ /mswin|os2/i);
 312     # strip meaningless extensions on VMS
 313     $_[0] =~ s/\.(com)\z//i if($^O eq 'VMS');
 314 }
 315
 316 # contribution from Tim Jenness <t.jenness@jach.hawaii.edu>
 317
 318 =head2 C<pod_where( { %opts }, $pod )>
 319
 320 Returns the location of a pod document given a search directory
 321 and a module (e.g. C<File::Find>) or script (e.g. C<perldoc>) name.
 322
 323 Options:
 324
 325 =over 4
 326
 327 =item C<-inc =E<gt> 1>
 328
 329 Search @INC for the pod and also the C<scriptdir> defined in the
 330 L<Config|Config> module.
 331
 332 =item C<-dirs =E<gt> [ $dir1, $dir2, ... ]>
 333
 334 Reference to an array of search directories. These are searched in order
 335 before looking in C<@INC> (if B<-inc>). Current directory is used if
 336 none are specified.
 337
 338 =item C<-verbose =E<gt> 1>
 339
 340 List directories as they are searched
 341
 342 =back
 343
 344 Returns the full path of the first occurrence to the file.
 345 Package names (eg 'A::B') are automatically converted to directory
 346 names in the selected directory. (eg on unix 'A::B' is converted to
 347 'A/B'). Additionally, '.pm', '.pl' and '.pod' are appended to the
 348 search automatically if required.
 349
 350 A subdirectory F<pod/> is also checked if it exists in any of the given
 351 search directories. This ensures that e.g. L<perlfunc|perlfunc> is
 352 found.
 353
 354 It is assumed that if a module name is supplied, that that name
 355 matches the file name. Pods are not opened to check for the 'NAME'
 356 entry.
 357
 358 A check is made to make sure that the file that is found does
 359 contain some pod documentation.
 360
 361 =cut
 362
 363 sub pod_where {
 364
 365   # default options
 366   my %options = (
 367          '-inc' => 0,
 368          '-verbose' => 0,
 369          '-dirs' => [ File::Spec->curdir ],
 370         );
 371
 372   # Check for an options hash as first argument
 373   if (defined $_[0] && ref($_[0]) eq 'HASH') {
 374     my $opt = shift;
 375
 376     # Merge default options with supplied options
 377     %options = (%options, %$opt);
 378   }
 379
 380   # Check usage
 381   carp 'Usage: pod_where({options}, $pod)' unless (scalar(@_));
 382
 383   # Read argument
 384   my $pod = shift;
 385
 386   # Split on :: and then join the name together using File::Spec
 387   my @parts = split (/::/, $pod);
 388
 389   # Get full directory list
 390   my @search_dirs = @{ $options{'-dirs'} };
 391
 392   if ($options{'-inc'}) {
 393
 394     require Config;
 395
 396     # Add @INC
 397     if ($^O eq 'MacOS' && $options{'-inc'}) {
 398         # tolerate '.', './some_dir' and '(../)+some_dir' on Mac OS
 399         my @new_INC = @INC;
 400         for (@new_INC) {
 401             if ( $_ eq '.' ) {
 402                 $_ = ':';
 403             } elsif ( $_ =~ s|^((?:\.\./)+)|':' x (length($1)/3)|e ) {
 404                 $_ = ':'. $_;
 405             } else {
 406                 $_ =~ s|^\./|:|;
 407             }
 408         }
 409         push (@search_dirs, @new_INC);
 410     } elsif ($options{'-inc'}) {
 411         push (@search_dirs, @INC);
 412     }
 413
 414     # Add location of pod documentation for perl man pages (eg perlfunc)
 415     # This is a pod directory in the private install tree
 416     #my $perlpoddir = File::Spec->catdir($Config::Config{'installprivlib'},
 417     #                                   'pod');
 418     #push (@search_dirs, $perlpoddir)
 419     #  if -d $perlpoddir;
 420
 421     # Add location of binaries such as pod2text
 422     push (@search_dirs, $Config::Config{'scriptdir'})
 423       if -d $Config::Config{'scriptdir'};
 424   }
 425
 426   warn "Search path is: ".join(' ', @search_dirs)."\n"
 427         if $options{'-verbose'};
 428
 429   # Loop over directories
 430   Dir: foreach my $dir ( @search_dirs ) {
 431
 432     # Don't bother if can't find the directory
 433     if (-d $dir) {
 434       warn "Looking in directory $dir\n"
 435         if $options{'-verbose'};
 436
 437       # Now concatenate this directory with the pod we are searching for
 438       my $fullname = File::Spec->catfile($dir, @parts);
 439       warn "Filename is now $fullname\n"
 440         if $options{'-verbose'};
 441
 442       # Loop over possible extensions
 443       foreach my $ext ('', '.pod', '.pm', '.pl') {
 444         my $fullext = $fullname . $ext;
 445         if (-f $fullext &&
 446          contains_pod($fullext, $options{'-verbose'}) ) {
 447           warn "FOUND: $fullext\n" if $options{'-verbose'};
 448           return $fullext;
 449         }
 450       }
 451     } else {
 452       warn "Directory $dir does not exist\n"
 453         if $options{'-verbose'};
 454       next Dir;
 455     }
 456     # for some strange reason the path on MacOS/darwin/cygwin is
 457     # 'pods' not 'pod'
 458     # this could be the case also for other systems that
 459     # have a case-tolerant file system, but File::Spec
 460     # does not recognize 'darwin' yet. And cygwin also has "pods",
 461     # but is not case tolerant. Oh well...
 462     if((File::Spec->case_tolerant || $^O =~ /macos|darwin|cygwin/i)
 463      && -d File::Spec->catdir($dir,'pods')) {
 464       $dir = File::Spec->catdir($dir,'pods');
 465       redo Dir;
 466     }
 467     if(-d File::Spec->catdir($dir,'pod')) {
 468       $dir = File::Spec->catdir($dir,'pod');
 469       redo Dir;
 470     }
 471   }
 472   # No match;
 473   return undef;
 474 }
 475
 476 =head2 C<contains_pod( $file , $verbose )>
 477
 478 Returns true if the supplied filename (not POD module) contains some pod
 479 information.
 480
 481 =cut
 482
 483 sub contains_pod {
 484   my $file = shift;
 485   my $verbose = 0;
 486   $verbose = shift if @_;
 487
 488   # check for one line of POD
 489   unless(open(POD,"<$file")) {
 490     warn "Error: $file is unreadable: $!\n";
 491     return undef;
 492   }
 493
 494   local $/ = undef;
 495   my $pod = <POD>;
 496   close(POD) || die "Error closing $file: $!\n";
 497   unless($pod =~ /^=(head\d|pod|over|item)\b/m) {
 498     warn "No POD in $file, skipping.\n"
 499       if($verbose);
 500     return 0;
 501   }
 502
 503   return 1;
 504 }
 505
 506 =head1 AUTHOR
 507
 508 Please report bugs using L<http://rt.cpan.org>.
 509
 510 Marek Rouchal E<lt>marekr@cpan.orgE<gt>,
 511 heavily borrowing code from Nick Ing-Simmons' PodToHtml.
 512
 513 Tim Jenness E<lt>t.jenness@jach.hawaii.eduE<gt> provided
 514 C<pod_where> and C<contains_pod>.
 515
 516 =head1 SEE ALSO
 517
 518 L<Pod::Parser>, L<Pod::Checker>, L<perldoc>
 519
 520 =cut
 521
 522 1;
 523