IkiWiki/Plugin/poll.pm

   1 #!/usr/bin/perl
   2 package IkiWiki::Plugin::poll;
   3
   4 use warnings;
   5 use strict;
   6 use IkiWiki 3.00;
   7 use Encode;
   8
   9 sub import {
  10         hook(type => "getsetup", id => "poll", call => \&getsetup);
  11         hook(type => "preprocess", id => "poll", call => \&preprocess);
  12         hook(type => "sessioncgi", id => "poll", call => \&sessioncgi);
  13 }
  14
  15 sub getsetup () {
  16         return
  17                 plugin => {
  18                         safe => 1,
  19                         rebuild => undef,
  20                         section => "widget",
  21                 },
  22 }
  23
  24 my %pagenum;
  25 sub preprocess (@) {
  26         my %params=(open => "yes", total => "yes", percent => "yes", @_);
  27
  28         my $open=IkiWiki::yesno($params{open});
  29         my $showtotal=IkiWiki::yesno($params{total});
  30         my $showpercent=IkiWiki::yesno($params{percent});
  31         $pagenum{$params{page}}++;
  32
  33         my %choices;
  34         my @choices;
  35         my $total=0;
  36         while (@_) {
  37                 my $key=shift;
  38                 my $value=shift;
  39
  40                 next unless $key =~ /^\d+/;
  41
  42                 my $num=$key;
  43                 $key=shift;
  44                 $value=shift;
  45
  46                 $choices{$key}=$num;
  47                 push @choices, $key;
  48                 $total+=$num;
  49         }
  50
  51         my $ret="";
  52         foreach my $choice (@choices) {
  53                 if ($open && exists $config{cgiurl}) {
  54                         # use POST to avoid robots
  55                         $ret.="<form method=\"POST\" action=\"$config{cgiurl}\">\n";
  56                 }
  57                 my $percent=$total > 0 ? int($choices{$choice} / $total * 100) : 0;
  58                 $ret.="<p>\n";
  59                 if ($showpercent) {
  60                         $ret.="$choice ($percent%)\n";
  61                 }
  62                 else {
  63                         $ret.="$choice ($choices{$choice})\n";
  64                 }
  65                 if ($open && exists $config{cgiurl}) {
  66                         $ret.="<input type=\"hidden\" name=\"do\" value=\"poll\" />\n";
  67                         $ret.="<input type=\"hidden\" name=\"num\" value=\"$pagenum{$params{page}}\" />\n";
  68                         $ret.="<input type=\"hidden\" name=\"page\" value=\"$params{page}\" />\n";
  69                         $ret.="<input type=\"hidden\" name=\"choice\" value=\"$choice\" />\n";
  70                         $ret.="<input type=\"submit\" value=\"".gettext("vote")."\" />\n";
  71                 }
  72                 $ret.="</p>\n<hr class=poll align=left width=\"$percent%\"/>\n";
  73                 if ($open && exists $config{cgiurl}) {
  74                         $ret.="</form>\n";
  75                 }
  76         }
  77         if ($showtotal) {
  78                 $ret.="<span>".gettext("Total votes:")." $total</span>\n";
  79         }
  80         return "<div class=poll>$ret</div>";
  81 }
  82
  83 sub sessioncgi ($$) {
  84         my $cgi=shift;
  85         my $session=shift;
  86         if (defined $cgi->param('do') && $cgi->param('do') eq "poll") {
  87                 my $choice=decode_utf8($cgi->param('choice'));
  88                 if (! defined $choice) {
  89                         error("no choice specified");
  90                 }
  91                 my $num=$cgi->param('num');
  92                 if (! defined $num) {
  93                         error("no num specified");
  94                 }
  95                 my $page=IkiWiki::possibly_foolish_untaint($cgi->param('page'));
  96                 if (! defined $page || ! exists $pagesources{$page}) {
  97                         error("bad page name");
  98                 }
  99
 100                 # Did they vote before? If so, let them change their vote,
 101                 # and check for dups.
 102                 my $choice_param="poll_choice_${page}_$num";
 103                 my $oldchoice=$session->param($choice_param);
 104                 if (defined $oldchoice && $oldchoice eq $choice) {
 105                         # Same vote; no-op.
 106                         IkiWiki::redirect($cgi, urlto($page, undef, 1));
 107                         exit;
 108                 }
 109
 110                 my $prefix=$config{prefix_directives} ? "!poll" : "poll";
 111
 112                 my $content=readfile(srcfile($pagesources{$page}));
 113                 # Now parse the content, find the right poll,
 114                 # and find the choice within it, and increment its number.
 115                 # If they voted before, decrement that one.
 116                 my $edit=sub {
 117                         my $escape=shift;
 118                         my $params=shift;
 119                         return "\\[[$prefix $params]]" if $escape;
 120                         if (--$num == 0) {
 121                                 $params=~s/(^|\s+)(\d+)\s+"?\Q$choice\E"?(\s+|$)/$1.($2+1)." \"$choice\"".$3/se;
 122                                 if (defined $oldchoice) {
 123                                         $params=~s/(^|\s+)(\d+)\s+"?\Q$oldchoice\E"?(\s+|$)/$1.($2-1 >=0 ? $2-1 : 0)." \"$oldchoice\"".$3/se;
 124                                 }
 125                         }
 126                         return "[[$prefix $params]]";
 127                 };
 128                 $content =~ s{(\\?)\[\[\Q$prefix\E\s+([^]]+)\s*\]\]}{$edit->($1, $2)}seg;
 129
 130                 # Store their vote, update the page, and redirect to it.
 131                 writefile($pagesources{$page}, $config{srcdir}, $content);
 132                 $session->param($choice_param, $choice);
 133                 IkiWiki::cgi_savesession($session);
 134                 $oldchoice=$session->param($choice_param);
 135                 if ($config{rcs}) {
 136                         IkiWiki::disable_commit_hook();
 137                         IkiWiki::rcs_commit(
 138                                 file => $pagesources{$page},
 139                                 message => "poll vote ($choice)",
 140                                 token => IkiWiki::rcs_prepedit($pagesources{$page}),
 141                                 session => $session,
 142                         );
 143                         IkiWiki::enable_commit_hook();
 144                         IkiWiki::rcs_update();
 145                 }
 146                 require IkiWiki::Render;
 147                 IkiWiki::refresh();
 148                 IkiWiki::saveindex();
 149
 150                 # Need to set cookie in same http response that does the
 151                 # redir.
 152                 eval q{use CGI::Cookie};
 153                 error($@) if $@;
 154                 my $cookie = CGI::Cookie->new(-name=> $session->name, -value=> $session->id);
 155                 print $cgi->redirect(-cookie => $cookie,
 156                         -url => urlto($page, undef, 1));
 157                 exit;
 158         }
 159 }
 160
 161 1