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 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 $showpercent=yesno($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 $choice (@choices) {
  48                 if ($open && exists $config{cgiurl}) {
  49                         # use POST to avoid robots
  50                         $ret.="<form method=\"POST\" action=\"$config{cgiurl}\">\n";
  51                 }
  52                 my $percent=$total > 0 ? int($choices{$choice} / $total * 100) : 0;
  53                 $ret.="<p>\n";
  54                 if ($showpercent) {
  55                         $ret.="$choice ($percent%)\n";
  56                 }
  57                 else {
  58                         $ret.="$choice ($choices{$choice})\n";
  59                 }
  60                 if ($open && exists $config{cgiurl}) {
  61                         $ret.="<input type=\"hidden\" name=\"do\" value=\"poll\" />\n";
  62                         $ret.="<input type=\"hidden\" name=\"num\" value=\"$pagenum{$params{page}}\" />\n";
  63                         $ret.="<input type=\"hidden\" name=\"page\" value=\"$params{page}\" />\n";
  64                         $ret.="<input type=\"hidden\" name=\"choice\" value=\"$choice\" />\n";
  65                         $ret.="<input type=\"submit\" value=\"".gettext("vote")."\" />\n";
  66                 }
  67                 $ret.="</p>\n<hr class=poll align=left width=\"$percent%\"/>\n";
  68                 if ($open && exists $config{cgiurl}) {
  69                         $ret.="</form>\n";
  70                 }
  71         }
  72         if ($showtotal) {
  73                 $ret.="<span>".gettext("Total votes:")." $total</span>\n";
  74         }
  75         return "<div class=poll>$ret</div>";
  76 } # }}}
  77
  78 sub sessioncgi ($$) { #{{{
  79         my $cgi=shift;
  80         my $session=shift;
  81         if (defined $cgi->param('do') && $cgi->param('do') eq "poll") {
  82                 my $choice=decode_utf8($cgi->param('choice'));
  83                 if (! defined $choice) {
  84                         error("no choice specified");
  85                 }
  86                 my $num=$cgi->param('num');
  87                 if (! defined $num) {
  88                         error("no num specified");
  89                 }
  90                 my $page=IkiWiki::possibly_foolish_untaint($cgi->param('page'));
  91                 if (! defined $page || ! exists $pagesources{$page}) {
  92                         error("bad page name");
  93                 }
  94
  95                 # Did they vote before? If so, let them change their vote,
  96                 # and check for dups.
  97                 my $choice_param="poll_choice_${page}_$num";
  98                 my $oldchoice=$session->param($choice_param);
  99                 if (defined $oldchoice && $oldchoice eq $choice) {
 100                         # Same vote; no-op.
 101                         IkiWiki::redirect($cgi, "$config{url}/".htmlpage($page));
 102                         exit;
 103                 }
 104
 105                 my $prefix=$config{prefix_directives} ? "!poll" : "poll";
 106
 107                 my $content=readfile(srcfile($pagesources{$page}));
 108                 # Now parse the content, find the right poll,
 109                 # and find the choice within it, and increment its number.
 110                 # If they voted before, decrement that one.
 111                 my $edit=sub {
 112                         my $escape=shift;
 113                         my $params=shift;
 114                         return "\\[[$prefix $params]]" if $escape;
 115                         if (--$num == 0) {
 116                                 $params=~s/(^|\s+)(\d+)\s+"?\Q$choice\E"?(\s+|$)/$1.($2+1)." \"$choice\"".$3/se;
 117                                 if (defined $oldchoice) {
 118                                         $params=~s/(^|\s+)(\d+)\s+"?\Q$oldchoice\E"?(\s+|$)/$1.($2-1 >=0 ? $2-1 : 0)." \"$oldchoice\"".$3/se;
 119                                 }
 120                         }
 121                         return "[[$prefix $params]]";
 122                 };
 123                 $content =~ s{(\\?)\[\[\Q$prefix\E\s+([^]]+)\s*\]\]}{$edit->($1, $2)}seg;
 124
 125                 # Store their vote, update the page, and redirect to it.
 126                 writefile($pagesources{$page}, $config{srcdir}, $content);
 127                 $session->param($choice_param, $choice);
 128                 IkiWiki::cgi_savesession($session);
 129                 $oldchoice=$session->param($choice_param);
 130                 if ($config{rcs}) {
 131                         IkiWiki::disable_commit_hook();
 132                         IkiWiki::rcs_commit($pagesources{$page}, "poll vote ($choice)",
 133                                 IkiWiki::rcs_prepedit($pagesources{$page}),
 134                                 $session->param("name"), $ENV{REMOTE_ADDR});
 135                         IkiWiki::enable_commit_hook();
 136                         IkiWiki::rcs_update();
 137                 }
 138                 require IkiWiki::Render;
 139                 IkiWiki::refresh();
 140                 IkiWiki::saveindex();
 141
 142                 # Need to set cookie in same http response that does the
 143                 # redir.
 144                 eval q{use CGI::Cookie};
 145                 error($@) if $@;
 146                 my $cookie = CGI::Cookie->new(-name=> $session->name, -value=> $session->id);
 147                 print $cgi->redirect(-cookie => $cookie,
 148                         -url => "$config{url}/".htmlpage($page));
 149                 exit;
 150         }
 151 } #}}}
 152
 153 1