mdw@git.distorted.org.uk Git - sw-tools/blob - perl/SWMan.pm

   1 # -*-perl-*-
   2 #
   3 # $Id: SWMan.pm,v 1.3 1999/08/19 12:11:10 mdw Exp $
   4 #
   5 # Display and other fiddling of manual pages
   6 #
   7 # (c) 1999 EBI
   8 #
   9
  10 #----- Licensing notice -----------------------------------------------------
  11 #
  12 # This file is part of sw-tools.
  13 #
  14 # sw-tools is free software; you can redistribute it and/or modify
  15 # it under the terms of the GNU General Public License as published by
  16 # the Free Software Foundation; either version 2 of the License, or
  17 # (at your option) any later version.
  18 #
  19 # sw-tools is distributed in the hope that it will be useful,
  20 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  21 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22 # GNU General Public License for more details.
  23 #
  24 # You should have received a copy of the GNU General Public License
  25 # along with sw-tools; if not, write to the Free Software Foundation,
  26 # Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  27
  28 #----- Revision history -----------------------------------------------------
  29 #
  30 # $Log: SWMan.pm,v $
  31 # Revision 1.3  1999/08/19 12:11:10  mdw
  32 # More improvements to URL recognizer.
  33 #
  34 # Revision 1.2  1999/08/18 17:10:07  mdw
  35 # Slight improvements to URL and email address parsing.
  36 #
  37 # Revision 1.1  1999/07/30 18:46:37  mdw
  38 # New CGI script for browsing installed software and documentation.
  39 #
  40
  41 #----- Package preamble -----------------------------------------------------
  42
  43 package SWMan;
  44
  45 use IO;
  46 use POSIX;
  47 use DirHandle;
  48 use Exporter;
  49
  50 use SWConfig;
  51 use SWCGI qw(:DEFAULT :layout);
  52
  53 @ISA = qw(Exporter);
  54 @EXPORT_OK = qw(subst urlsubst check);
  55
  56 #----- Useful functions -----------------------------------------------------
  57
  58 %mandb = ();
  59
  60 # --- @mans(SECTION)@ ---
  61 #
  62 # Returns a reference to a list of manual pages in the given section.
  63
  64 sub mans($) {
  65   my ($sec) = @_;
  66   $mandb{$sec} and return $mandb{sec};
  67
  68   my $d = DirHandle->new("$C{prefix}/man/man$sec") or return undef;
  69   my @f;
  70   while (my $f = $d->read()) {
  71     push(@f, $f);
  72   }
  73   $mandb{$sec} = \@f;
  74   return \@f;
  75 }
  76
  77 # --- @check(NAME, SECTION)@ ---
  78 #
  79 # See whether there's a manpage called NAME with section SECTION.
  80
  81 sub check($$) {
  82   my $pre = "$C{prefix}/man/man";
  83   my ($man, $sec) = @_;
  84   my $f;
  85
  86   # --- Quick check for obvious things ---
  87
  88   my ($base) = ($sec =~ /^(\d+)/);
  89   $f = "$pre$base/$man.$sec";
  90   -r $f and return $f; $f .= ".gz"; -r $f and return $f;
  91
  92   # --- Snarf the appropriate filename list ---
  93
  94   my $fs = mans($base) or return undef;
  95   foreach my $f (@$fs) {
  96     $f =~ /^$man\.$sec\w+(\.gz)?$/ and return "$C{prefix}/man/man$base/$f";
  97   }
  98   return undef;
  99 }
 100
 101 # --- @subst(STRING, NAME, SECTION)@ ---
 102 #
 103 # If NAME(SECTION) is a manual page, return the STRING appropriately wrapped
 104 # in an anchor element; otherwise return it unmolested.
 105
 106 sub subst($$$) {
 107   my ($s, $n, $sec) = @_;
 108   check($n, $sec) and
 109     return "<a href=\"$ref?act=man&man=$n&sec=$sec\">$s</a>";
 110   return "$s";
 111 }
 112
 113 # --- @urlsubst(URL, STRING)@ ---
 114 #
 115 # Substitutes in a URL reference.  The important bit is that embedded `&'
 116 # characters are un-entitied from `&amp;'.  This doesn't seem to upset
 117 # Netscape or Lynx as much as I'd expect (or, in fact, at all), but it's
 118 # slightly untidy.
 119
 120 sub urlsubst($$) {
 121   my ($url, $name) = @_;
 122   $url =~ s/\&amp\;/&/;
 123   return "<a href=\"$url\">$name</a>";
 124 }
 125
 126 # --- @sections()@ ---
 127 #
 128 # Return a list of manual sections.
 129
 130 @sectionlist = ();
 131
 132 sub sections() {
 133   return @sectionlist if @sectionlist;
 134   my @s = ();
 135   my $d = DirHandle->new("$C{prefix}/man") or
 136     barf("couldn't open man directory: $!");
 137   while ($f = $d->read()) {
 138     next if $f !~ /^man/ || !-d "$C{prefix}/man/$f";
 139     push(@s, $');
 140   }
 141   return (@sectionlist = sort(@s));
 142 }
 143
 144 #----- Display a quick section index ----------------------------------------
 145
 146 sub quickie {
 147   print "Quick section index:\n";
 148   foreach $s (sections()) {
 149     print "<a href=\"$ref?act=man&sec=$s\">$s</a>\n";
 150   }
 151 }
 152
 153 #----- Display indices for manual sections ----------------------------------
 154
 155 sub dosection($) {
 156   my ($sec) = @_;
 157   my @m = ();
 158
 159   barf("illegal section `$sec'") if $sec =~ m:/:;
 160
 161   # --- Snarf the list of manual pages in this section ---
 162
 163   {
 164     my $d = DirHandle->new("$C{prefix}/man/man$sec") or
 165       barf("couldn't read directory `$C{prefix}/man/man$sec': $!");
 166     while (my $f = $d->read()) {
 167       my ($man, $sec) = split(/\./, $f, 3);
 168       push(@m, "$man($sec)") if $sec;
 169     }
 170   }
 171
 172   # --- Sort and emit the index ---
 173
 174   print("<h4>Section $sec</h4>\n<table>");
 175
 176   {
 177     my $col = 0;
 178     foreach my $m (sort(@m)) {
 179       my ($man, $sec) = $m =~ /^(.*)\((.*)\)$/;
 180       $col or print("<tr>\n");
 181       print("<td><a href=\"$ref?act=man&man=$man&sec=$sec\">$m</a>\n");
 182       $col = ($col + 1) % 5;
 183     }
 184   }
 185
 186   print("</table>\n");
 187 }
 188
 189 sub section {
 190   my $sec = $Q{"sec"};
 191   header("Index of manual section $sec");
 192   quickie(); print "<hr>\n";
 193   dosection($sec);
 194   print "<hr>\n"; quickie();;
 195   footer();
 196 }
 197
 198 sub index {
 199   header("Manual page index");
 200   print("<h3>Manual page index</h3>\n");
 201   foreach my $s (sections()) { dosection($s); }
 202   footer();
 203 }
 204
 205 #----- Display a manual page ------------------------------------------------
 206
 207 sub man {
 208   my ($man, $sec) = ($Q{"man"}, $Q{"sec"});
 209
 210   $sec or &index(), return;
 211   $man or &section(), return;
 212
 213   my $file = check($man, $sec) or
 214     barf("no manual page $man($sec)");
 215   barf("illegal filename `$file'") if $file =~ m:\./:;
 216
 217   # --- Read the manual page ---
 218
 219   my $p = IO::Pipe->new();
 220   my $kid = fork();
 221   defined($kid) or barf("fork failed: $!");
 222   if ($kid == 0) {
 223     $p->writer();
 224     dup2($p->fileno(), 1);
 225     chdir("$C{prefix}/man");
 226     if ($file =~ /\.gz$/) {
 227       $pp = IO::Pipe->new;
 228       $kkid = fork();
 229       defined($kid) or exit(127);
 230       if ($kkid == 0) {
 231         $pp->writer();
 232         dup2($pp->fileno, 1);
 233         exec("gzip", "-dc", $file);
 234         exit(127);
 235       }
 236       exec("nroff", "-man");
 237     } else {
 238       exec("nroff", "-man", $file);
 239     }
 240     exit(127);
 241   }
 242   $p->reader();
 243
 244   # --- Spit out the manual page now ---
 245
 246   header("Manual page $Q{man}($Q{sec})");
 247   quickie(); print "<hr>\n";
 248   print "<pre>\n";
 249   while (my $line = $p->getline()) {
 250     chomp $line;
 251
 252     # --- Grind through the line turning it into HTML ---
 253
 254     {
 255       my $state = "";
 256       my $l = "";
 257
 258       for (my $i = 0; $i < length($line); $i++) {
 259         my $ch = substr($line, $i, 1);
 260         my $nstate = "";
 261
 262         # --- Sort out overstriking ---
 263
 264         if (substr($line, $i + 1, 1) eq "\b") {
 265           my ($italic, $bold) = (0, 0);
 266           $ch eq "_" and $italic = 1;
 267           $ch eq substr($line, $i + 2, 1) and $bold = 1;
 268           $ch = substr($line, $i + 2, 1);
 269           while (substr($line, $i + 1, 1) eq "\b") { $i += 2; }
 270           if ($italic && $bold) {
 271             $nstate = $state ? $state : "b";
 272           } elsif ($italic) {
 273             $nstate = "i";
 274           } elsif ($bold) {
 275             $nstate = "b";
 276           }
 277         }
 278         $state ne $nstate and
 279           $l .= ($state && "</$state>") . ($nstate && "<$nstate>");
 280         $state = $nstate;
 281
 282         # --- Translate the character if it's magical ---
 283
 284         $ch eq "&" and $ch = "&amp;";
 285         $ch eq "<" and $ch = "&lt;<";
 286         $ch eq ">" and $ch = ">&gt;";
 287         $l .= $ch;
 288       }
 289       $state and $l .= "</$state>";
 290
 291       # --- Now find manual references in there ---
 292       #
 293       # I don't use /x regexps very often, but I think this is a good excuse.
 294
 295       $l =~ s! ((?:\<[bi]\>)*)          # Leading highlighting tags
 296                ([-_.\w]+)               # Various plausible manual name chars
 297                ((?:\</[bi]\>)*          # Closing highlighting tags
 298                 (?:\<[bi]\>)*           # And opening ones again
 299                 \(                      # An open parenthesis
 300                 (?:\<[bi]\>)*)          # More opening highlights
 301                 (\d+\w*)                # The section number
 302                 ((?:\</[bi]\>)*         # Close highlights
 303                  \)                     # Close parens
 304                  (?:\</[bi]\>)*)        # Finally more closing tags
 305              ! subst($&, $2, $4) !egx;
 306
 307       # --- And email and hypertext references too ---
 308
 309       $l =~ s! ((?:\<[bi]\>)*)          # Leading highlighting
 310                ( \b (?: http s? | ftp | file | news ) # A protocol name
 311                 :                       # The important and obvious bit
 312                 [^]<>)\s<>\'\"]+        # Most characters are allowed
 313                 [^]<>).,\s<>\'\"])      # Don't end on punctuation
 314                ((?:\</[bi]\>)*)         # Closing tags, optional
 315              !urlsubst($2, $&)!egx;
 316
 317       $l =~ s! ( (?:\<[bi]\>)* (?:\bmailto:)? )
 318                ( [^\s()<>;:{}&<>,.\`\'\"] [^\s()<>;:{}&<>\`\'\"]* \@
 319                  [^\s()<>;:{&}<>\'\"]* [^\s()<>;:{}&<>.,\'\"])
 320                ((?:\</[bi]\>)*)
 321              !<a href="mailto:$2">$&</a>!gx;
 322
 323       # --- Fix up the HTML ---
 324
 325       $l =~ s/\&lt\;\</&lt;/g;
 326       $l =~ s/\>\&gt\;/&gt;/g;
 327
 328       # --- Done! ---
 329
 330       print $l, "\n";
 331     }
 332   }
 333
 334   # --- Done all of that ---
 335
 336   print "</pre>\n";
 337   $p->close();
 338   waitpid($kid, 0);
 339   barf("nroff failed (exit status $?)") if $?;
 340   print "<hr>\n"; quickie();;
 341   footer();
 342 }
 343
 344 #----- Register actions -----------------------------------------------------
 345
 346 $main::ACT{"man"} = \&man;
 347
 348 #----- That's all, folks ----------------------------------------------------
 349
 350 1;