IkiWiki/Plugin/poll.pm

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