IkiWiki/Plugin/poll.pm

   1 #!/usr/bin/perl
   2 package IkiWiki::Plugin::poll;
   3
   4 use warnings;
   5 use strict;
   6 use IkiWiki 2.00;
   7 use Encode;
   8
   9 sub import { #{{{
  10         hook(type => "preprocess", id => "poll", call => \&preprocess);
  11         hook(type => "sessioncgi", id => "poll", call => \&sessioncgi);
  12 } # }}}
  13
  14 my %pagenum;
  15 sub preprocess (@) { #{{{
  16         my %params=(open => "yes", total => "yes", percent => "yes", @_);
  17
  18         my $open=IkiWIki::yesno($params{open});
  19         my $showtotal=IkiWiki::yesno($params{total});
  20         my $showpercent=IkiWiki::yesno($params{percent});
  21         $pagenum{$params{page}}++;
  22
  23         my %choices;
  24         my @choices;
  25         my $total=0;
  26         while (@_) {
  27                 my $key=shift;
  28                 my $value=shift;
  29
  30                 next unless $key =~ /^\d+/;
  31
  32                 my $num=$key;
  33                 $key=shift;
  34                 $value=shift;
  35
  36                 $choices{$key}=$num;
  37                 push @choices, $key;
  38                 $total+=$num;
  39         }
  40
  41         my $ret="";
  42         foreach my $choice (@choices) {
  43                 if ($open && exists $config{cgiurl}) {
  44                         # use POST to avoid robots
  45                         $ret.="<form method=\"POST\" action=\"$config{cgiurl}\">\n";
  46                 }
  47                 my $percent=$total > 0 ? int($choices{$choice} / $total * 100) : 0;
  48                 $ret.="<p>\n";
  49                 if ($showpercent) {
  50                         $ret.="$choice ($percent%)\n";
  51                 }
  52                 else {
  53                         $ret.="$choice ($choices{$choice})\n";
  54                 }
  55                 if ($open && exists $config{cgiurl}) {
  56                         $ret.="<input type=\"hidden\" name=\"do\" value=\"poll\" />\n";
  57                         $ret.="<input type=\"hidden\" name=\"num\" value=\"$pagenum{$params{page}}\" />\n";
  58                         $ret.="<input type=\"hidden\" name=\"page\" value=\"$params{page}\" />\n";
  59                         $ret.="<input type=\"hidden\" name=\"choice\" value=\"$choice\" />\n";
  60                         $ret.="<input type=\"submit\" value=\"".gettext("vote")."\" />\n";
  61                 }
  62                 $ret.="</p>\n<hr class=poll align=left width=\"$percent%\"/>\n";
  63                 if ($open && exists $config{cgiurl}) {
  64                         $ret.="</form>\n";
  65                 }
  66         }
  67         if ($showtotal) {
  68                 $ret.="<span>".gettext("Total votes:")." $total</span>\n";
  69         }
  70         return "<div class=poll>$ret</div>";
  71 } # }}}
  72
  73 sub sessioncgi ($$) { #{{{
  74         my $cgi=shift;
  75         my $session=shift;
  76         if (defined $cgi->param('do') && $cgi->param('do') eq "poll") {
  77                 my $choice=decode_utf8($cgi->param('choice'));
  78                 if (! defined $choice) {
  79                         error("no choice specified");
  80                 }
  81                 my $num=$cgi->param('num');
  82                 if (! defined $num) {
  83                         error("no num specified");
  84                 }
  85                 my $page=IkiWiki::possibly_foolish_untaint($cgi->param('page'));
  86                 if (! defined $page || ! exists $pagesources{$page}) {
  87                         error("bad page name");
  88                 }
  89
  90                 # Did they vote before? If so, let them change their vote,
  91                 # and check for dups.
  92                 my $choice_param="poll_choice_${page}_$num";
  93                 my $oldchoice=$session->param($choice_param);
  94                 if (defined $oldchoice && $oldchoice eq $choice) {
  95                         # Same vote; no-op.
  96                         IkiWiki::redirect($cgi, "$config{url}/".htmlpage($page));
  97                         exit;
  98                 }
  99
 100                 my $prefix=$config{prefix_directives} ? "!poll" : "poll";
 101
 102                 my $content=readfile(srcfile($pagesources{$page}));
 103                 # Now parse the content, find the right poll,
 104                 # and find the choice within it, and increment its number.
 105                 # If they voted before, decrement that one.
 106                 my $edit=sub {
 107                         my $escape=shift;
 108                         my $params=shift;
 109                         return "\\[[$prefix $params]]" if $escape;
 110                         if (--$num == 0) {
 111                                 $params=~s/(^|\s+)(\d+)\s+"?\Q$choice\E"?(\s+|$)/$1.($2+1)." \"$choice\"".$3/se;
 112                                 if (defined $oldchoice) {
 113                                         $params=~s/(^|\s+)(\d+)\s+"?\Q$oldchoice\E"?(\s+|$)/$1.($2-1 >=0 ? $2-1 : 0)." \"$oldchoice\"".$3/se;
 114                                 }
 115                         }
 116                         return "[[$prefix $params]]";
 117                 };
 118                 $content =~ s{(\\?)\[\[\Q$prefix\E\s+([^]]+)\s*\]\]}{$edit->($1, $2)}seg;
 119
 120                 # Store their vote, update the page, and redirect to it.
 121                 writefile($pagesources{$page}, $config{srcdir}, $content);
 122                 $session->param($choice_param, $choice);
 123                 IkiWiki::cgi_savesession($session);
 124                 $oldchoice=$session->param($choice_param);
 125                 if ($config{rcs}) {
 126                         IkiWiki::disable_commit_hook();
 127                         IkiWiki::rcs_commit($pagesources{$page}, "poll vote ($choice)",
 128                                 IkiWiki::rcs_prepedit($pagesources{$page}),
 129                                 $session->param("name"), $ENV{REMOTE_ADDR});
 130                         IkiWiki::enable_commit_hook();
 131                         IkiWiki::rcs_update();
 132                 }
 133                 require IkiWiki::Render;
 134                 IkiWiki::refresh();
 135                 IkiWiki::saveindex();
 136
 137                 # Need to set cookie in same http response that does the
 138                 # redir.
 139                 eval q{use CGI::Cookie};
 140                 error($@) if $@;
 141                 my $cookie = CGI::Cookie->new(-name=> $session->name, -value=> $session->id);
 142                 print $cgi->redirect(-cookie => $cookie,
 143                         -url => "$config{url}/".htmlpage($page));
 144                 exit;
 145         }
 146 } #}}}
 147
 148 1