path: root/IkiWiki/Plugin/link.pm

#!/usr/bin/perl
package IkiWiki::Plugin::link;

use warnings;
use strict;
use IkiWiki 3.00;

my $link_regexp;

sub import {
    hook(type => "getsetup", id => "link", call => \&getsetup);
    hook(type => "checkconfig", id => "link", call => \&checkconfig);
    hook(type => "linkify", id => "link", call => \&linkify);
    hook(type => "scan", id => "link", call => \&scan);
    hook(type => "renamepage", id => "link", call => \&renamepage);
}

sub getsetup () {
    return
        plugin => {
            safe => 1,
            rebuild => 1,
            section => "core",
        },
}

sub checkconfig () {
    if ($config{prefix_directives}) {
        $link_regexp = qr{
            \[\[(?=[^!])            # beginning of link
            (?:
                ([^\]\|]+)      # 1: link text
                \|              # followed by '|'
            )?                      # optional
            
            ([^\n\r\]#]+)           # 2: page to link to
            (?:
                \#              # '#', beginning of anchor
                ([^\s\]]+)      # 3: anchor text
            )?                      # optional
            
            \]\]                    # end of link
        }x;
    }
    else {
        $link_regexp = qr{
            \[\[                    # beginning of link
            (?:
                ([^\]\|\n\s]+)  # 1: link text
                \|              # followed by '|'
            )?                      # optional

            ([^\s\]#]+)             # 2: page to link to
            (?:
                \#              # '#', beginning of anchor
                ([^\s\]]+)      # 3: anchor text
            )?                      # optional

            \]\]                    # end of link
        }x,
    }
}

sub linkify (@) {
    my %params=@_;
    my $page=$params{page};
    my $destpage=$params{destpage};

    $params{content} =~ s{(\\?)$link_regexp}{
        defined $2
            ? ( $1 
                ? "[[$2|$3".($4 ? "#$4" : "")."]]" 
                : htmllink($page, $destpage, linkpage($3),
                    anchor => $4, linktext => pagetitle($2)))
            : ( $1 
                ? "[[$3".($4 ? "#$4" : "")."]]"
                : htmllink($page, $destpage, linkpage($3),
                    anchor => $4))
    }eg;
    
    return $params{content};
}

sub scan (@) {
    my %params=@_;
    my $page=$params{page};
    my $content=$params{content};

    while ($content =~ /(?<!\\)$link_regexp/g) {
        add_link($page, linkpage($2));
    }
}

sub renamepage (@) {
    my %params=@_;
    my $page=$params{page};
    my $old=$params{oldpage};
    my $new=$params{newpage};

    $params{content} =~ s{(?<!\\)$link_regexp}{
        my $linktext=$2;
        my $link=$linktext;
        if (bestlink($page, linkpage($linktext)) eq $old) {
            $link=pagetitle($new, 1);
            $link=~s/ /_/g;
            if ($linktext =~ m/.*\/*?[A-Z]/) {
                # preserve leading cap of last component
                my @bits=split("/", $link);
                $link=join("/", @bits[0..$#bits-1], ucfirst($bits[$#bits]));
            }
            if (index($linktext, "/") == 0) {
                # absolute link
                $link="/$link";
            }
        }
        defined $1
            ? ( "[[$1|$link".($3 ? "#$3" : "")."]]" )
            : ( "[[$link".   ($3 ? "#$3" : "")."]]" )
    }eg;

    return $params{content};
}

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