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 => "formbuilder_setup", id => "editdiff",
  13                 call => \&formbuilder_setup);
  14 } #}}}
  15
  16 sub diff ($$) { #{{{
  17         my $orig=shift;
  18         my $content=shift;
  19
  20         my $sigpipe=0;
  21         $SIG{PIPE} = sub { $sigpipe=1; };
  22
  23         my $pid = open2(*DIFFOUT, *DIFFIN, 'diff', '-u', $orig, '-');
  24         binmode($_, ':utf8') foreach (*DIFFIN, *DIFFOUT);
  25
  26         print DIFFIN $content;
  27         close DIFFIN;
  28         my $ret='';
  29         while (<DIFFOUT>) {
  30                 if (defined $ret) {
  31                         $ret.=$_;
  32                 }
  33                 elsif (/^\@\@/) {
  34                         $ret=$_;
  35                 }
  36         }
  37         close DIFFOUT;
  38         waitpid $pid, 0;
  39
  40         $SIG{PIPE}="default";
  41         return "couldn't run diff\n" if $sigpipe;
  42
  43         return "<pre>".encode_entities($ret)."</pre>";
  44 } #}}}
  45
  46 sub formbuilder_setup { #{{{
  47         my %params=@_;
  48         my $form=$params{form};
  49         my $page=$form->field("page");
  50
  51         return if $form->field("do") ne "edit";
  52
  53         $page = IkiWiki::titlepage(IkiWiki::possibly_foolish_untaint($page));
  54         return unless exists $pagesources{$page};
  55
  56         push @{$params{buttons}}, "Diff";
  57
  58         if ($form->submitted eq "Diff") {
  59                 my $content=$form->field('editcontent');
  60                 $content=~s/\r\n/\n/g;
  61                 $content=~s/\r/\n/g;
  62
  63                 my $diff = diff(srcfile($pagesources{$page}), $content);
  64                 $form->tmpl_param("page_preview", $diff);
  65         }
  66 } #}}}
  67
  68 1