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 2.00;
   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                 },
  23 }
  24
  25 sub diff ($$) {
  26         my $orig=shift;
  27         my $content=shift;
  28
  29         my $sigpipe=0;
  30         $SIG{PIPE} = sub { $sigpipe=1; };
  31
  32         my $pid = open2(*DIFFOUT, *DIFFIN, 'diff', '-u', $orig, '-');
  33         binmode($_, ':utf8') foreach (*DIFFIN, *DIFFOUT);
  34
  35         print DIFFIN $content;
  36         close DIFFIN;
  37         my $ret='';
  38         while (<DIFFOUT>) {
  39                 if (defined $ret) {
  40                         $ret.=$_;
  41                 }
  42                 elsif (/^\@\@/) {
  43                         $ret=$_;
  44                 }
  45         }
  46         close DIFFOUT;
  47         waitpid $pid, 0;
  48
  49         $SIG{PIPE}="default";
  50         return "couldn't run diff\n" if $sigpipe;
  51
  52         return "<pre>".encode_entities($ret)."</pre>";
  53 }
  54
  55 sub formbuilder_setup {
  56         my %params=@_;
  57         my $form=$params{form};
  58
  59         return if ! defined $form->field("do") || $form->field("do") ne "edit";
  60
  61         my $page=$form->field("page");
  62         $page = IkiWiki::possibly_foolish_untaint($page);
  63         return unless exists $pagesources{$page};
  64
  65         push @{$params{buttons}}, "Diff";
  66
  67         if ($form->submitted eq "Diff") {
  68                 my $content=$form->field('editcontent');
  69                 $content=~s/\r\n/\n/g;
  70                 $content=~s/\r/\n/g;
  71
  72                 my $diff = diff(srcfile($pagesources{$page}), $content);
  73                 $form->tmpl_param("page_preview", $diff);
  74         }
  75 }
  76
  77 1