IkiWiki/Plugin/editdiff.pm

   1 #!/usr/bin/perl
   2 # This plugin adds a "Diff" button to the page edit form.
   3 package IkiWiki::Plugin::editdiff;
   4
   5 use warnings;
   6 use strict;
   7 use IkiWiki 3.00;
   8 use HTML::Entities;
   9 use IPC::Open2;
  10
  11 sub import {
  12         hook(type => "getsetup", id => "editdiff", call => \&getsetup);
  13         hook(type => "formbuilder_setup", id => "editdiff",
  14                 call => \&formbuilder_setup);
  15 }
  16
  17 sub getsetup () {
  18         return
  19                 plugin => {
  20                         safe => 1,
  21                         rebuild => 0,
  22                         section => "web",
  23                 },
  24 }
  25
  26 sub diff ($$) {
  27         my $orig=shift;
  28         my $content=shift;
  29
  30         my $sigpipe=0;
  31         $SIG{PIPE} = sub { $sigpipe=1; };
  32
  33         my $pid = open2(*DIFFOUT, *DIFFIN, 'diff', '-u', $orig, '-');
  34         binmode($_, ':utf8') foreach (*DIFFIN, *DIFFOUT);
  35
  36         print DIFFIN $content;
  37         close DIFFIN;
  38         my $ret='';
  39         while (<DIFFOUT>) {
  40                 if (defined $ret) {
  41                         $ret.=$_;
  42                 }
  43                 elsif (/^\@\@/) {
  44                         $ret=$_;
  45                 }
  46         }
  47         close DIFFOUT;
  48         waitpid $pid, 0;
  49
  50         $SIG{PIPE}="default";
  51         return "couldn't run diff\n" if $sigpipe;
  52
  53         return "<pre>".encode_entities($ret)."</pre>";
  54 }
  55
  56 sub formbuilder_setup {
  57         my %params=@_;
  58         my $form=$params{form};
  59
  60         return if ! defined $form->field("do") || $form->field("do") ne "edit";
  61
  62         my $page=$form->field("page");
  63         $page = IkiWiki::possibly_foolish_untaint($page);
  64         return unless exists $pagesources{$page};
  65
  66         push @{$params{buttons}}, "Diff";
  67
  68         if ($form->submitted eq "Diff") {
  69                 my $content=$form->field('editcontent');
  70                 $content=~s/\r\n/\n/g;
  71                 $content=~s/\r/\n/g;
  72
  73                 my $diff = diff(srcfile($pagesources{$page}), $content);
  74                 $form->tmpl_param("page_preview", $diff);
  75         }
  76 }
  77
  78 1