IkiWiki/Plugin/link.pm

   1 #!/usr/bin/perl
   2 package IkiWiki::Plugin::link;
   3
   4 use warnings;
   5 use strict;
   6 use IkiWiki 3.00;
   7
   8 my $link_regexp;
   9
  10 my $email_regexp = qr/^(?:[a-z0-9!#$%&'*+\/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+\/=?^_`{|}~-]+)*|"(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21\x23-\x5b\x5d-\x7f]|\\[\x01-\x09\x0b\x0c\x0e-\x7f])*")@(?:(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?|\[(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?|[a-z0-9-]*[a-z0-9]:(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21-\x5a\x53-\x7f]|\\[\x01-\x09\x0b\x0c\x0e-\x7f])+)\])$/i;
  11 my $url_regexp = qr/^(?:[^:]+:\/\/|mailto:).*/i;
  12
  13 sub import {
  14         hook(type => "getsetup", id => "link", call => \&getsetup);
  15         hook(type => "checkconfig", id => "link", call => \&checkconfig);
  16         hook(type => "linkify", id => "link", call => \&linkify);
  17         hook(type => "scan", id => "link", call => \&scan);
  18         hook(type => "renamepage", id => "link", call => \&renamepage);
  19 }
  20
  21 sub getsetup () {
  22         return
  23                 plugin => {
  24                         safe => 1,
  25                         rebuild => 1,
  26                         section => "core",
  27                 },
  28 }
  29
  30 sub checkconfig () {
  31         if ($config{prefix_directives}) {
  32                 $link_regexp = qr{
  33                         \[\[(?=[^!])            # beginning of link
  34                         (?:
  35                                 ([^\]\|]+)      # 1: link text
  36                                 \|              # followed by '|'
  37                         )?                      # optional
  38
  39                         ([^\n\r\]#]+)           # 2: page to link to
  40                         (?:
  41                                 \#              # '#', beginning of anchor
  42                                 ([^\s\]]+)      # 3: anchor text
  43                         )?                      # optional
  44
  45                         \]\]                    # end of link
  46                 }x;
  47         }
  48         else {
  49                 $link_regexp = qr{
  50                         \[\[                    # beginning of link
  51                         (?:
  52                                 ([^\]\|\n\s]+)  # 1: link text
  53                                 \|              # followed by '|'
  54                         )?                      # optional
  55
  56                         ([^\s\]#]+)             # 2: page to link to
  57                         (?:
  58                                 \#              # '#', beginning of anchor
  59                                 ([^\s\]]+)      # 3: anchor text
  60                         )?                      # optional
  61
  62                         \]\]                    # end of link
  63                 }x;
  64         }
  65 }
  66
  67 sub is_externallink ($$) {
  68         my $page = shift;
  69         my $url = shift;
  70         if ($url =~ /$email_regexp/) {
  71                 # url looks like an email address, so we assume it
  72                 # is supposed to be an external link if there is no
  73                 # page with that name.
  74                 $url =~ s/#.*//;
  75                 return (! (bestlink($page, linkpage($url))))
  76         }
  77         return ($url =~ /$url_regexp/)
  78 }
  79
  80 sub externallink ($;@) {
  81         my $url = shift;
  82         my $pagetitle = shift;
  83
  84         # build pagetitle
  85         if (!($pagetitle)) {
  86                 $pagetitle = $url;
  87                 # use only the email address as title for mailto: urls
  88                 if ($pagetitle =~ /^mailto:.*/) {
  89                         $pagetitle =~ s/^mailto:([^?]+).*/$1/;
  90                 }
  91         }
  92
  93         # handle email-addresses (without mailto:):
  94         if ($url =~ /$email_regexp/) {
  95                 $url = "mailto:" . $url;
  96         }
  97
  98         return "<a href=\"$url\">$pagetitle</a>";
  99 }
 100
 101 sub linkify (@) {
 102         my %params=@_;
 103         my $page=$params{page};
 104         my $destpage=$params{destpage};
 105
 106         $params{content} =~ s{(\\?)$link_regexp}{
 107                 defined $2
 108                         ? ( $1
 109                                 ? "[[$2|$3".($4 ? "#$4" : "")."]]"
 110                                 : is_externallink($page, $3 . ($4 ? "#$4" : ""))
 111                                         ? externallink("$3" . ($4 ? "#$4" : ""), $2)
 112                                         : htmllink($page, $destpage, linkpage($3),
 113                                                 anchor => $4, linktext => pagetitle($2)))
 114                         : ( $1
 115                                 ? "[[$3".($4 ? "#$4" : "")."]]"
 116                                 : is_externallink($page, $3 . ($4 ? "#$4" : ""))
 117                                         ? externallink("$3" . ($4 ? "#$4" : ""))
 118                                         : htmllink($page, $destpage, linkpage($3),
 119                                                 anchor => $4))
 120         }eg;
 121
 122         return $params{content};
 123 }
 124
 125 sub scan (@) {
 126         my %params=@_;
 127         my $page=$params{page};
 128         my $content=$params{content};
 129
 130         while ($content =~ /(?<!\\)$link_regexp/g) {
 131                 if (! is_externallink($page, $2 . ($3 ? "#$3" : ""))) {
 132                         add_link($page, linkpage($2));
 133                 }
 134         }
 135 }
 136
 137 sub renamepage (@) {
 138         my %params=@_;
 139         my $page=$params{page};
 140         my $old=$params{oldpage};
 141         my $new=$params{newpage};
 142
 143         $params{content} =~ s{(?<!\\)$link_regexp}{
 144                 if (! is_externallink($page, $2 . ($3 ? "#$3" : ""))) {
 145                         my $linktext=$2;
 146                         my $link=$linktext;
 147                         if (bestlink($page, linkpage($linktext)) eq $old) {
 148                                 $link=pagetitle($new, 1);
 149                                 $link=~s/ /_/g;
 150                                 if ($linktext =~ m/.*\/*?[A-Z]/) {
 151                                         # preserve leading cap of last component
 152                                         my @bits=split("/", $link);
 153                                         $link=join("/", @bits[0..$#bits-1], ucfirst($bits[$#bits]));
 154                                 }
 155                                 if (index($linktext, "/") == 0) {
 156                                         # absolute link
 157                                         $link="/$link";
 158                                 }
 159                         }
 160                         defined $1
 161                                 ? ( "[[$1|$link".($3 ? "#$3" : "")."]]" )
 162                                 : ( "[[$link".   ($3 ? "#$3" : "")."]]" )
 163                 }
 164         }eg;
 165
 166         return $params{content};
 167 }
 168
 169 1