path: root/IkiWiki/Plugin/color.pm

#!/usr/bin/perl
# Ikiwiki text colouring plugin
# Paweł‚ Tęcza <ptecza@net.icm.edu.pl>
package IkiWiki::Plugin::color;

use warnings;
use strict;
use IkiWiki 2.00;

sub import {
    hook(type => "preprocess", id => "color", call => \&preprocess);
    hook(type => "format",     id => "color", call => \&format);
}

sub preserve_style ($$$) {
    my $foreground = shift;
    my $background = shift;
    my $text       = shift;

    $foreground = defined $foreground ? lc($foreground) : '';
    $background = defined $background ? lc($background) : '';
    $text       = '' unless (defined $text);

    # Validate colors. Only color name or color code are valid.
    $foreground = '' unless ($foreground &&
                ($foreground =~ /^[a-z]+$/ || $foreground =~ /^#[0-9a-f]{3,6}$/));
    $background = '' unless ($background &&
                ($background =~ /^[a-z]+$/ || $background =~ /^#[0-9a-f]{3,6}$/));

    my $preserved = '';
    $preserved .= '<span class="color">';
    $preserved .= 'color: '.$foreground if ($foreground);
    $preserved .= '; ' if ($foreground && $background);
    $preserved .= 'background-color: '.$background if ($background);
    $preserved .= '</span>';
    $preserved .= '<span class="colorend">'.$text.'</span>';
    
    return $preserved;

}

sub replace_preserved_style ($) {
    my $content = shift;

    $content =~ s!<span class="color">((color: ([a-z]+|\#[0-9a-f]{3,6})?)?((; )?(background-color: ([a-z]+|\#[0-9a-f]{3,6})?)?)?)</span>!<span class="color" style="$1">!g;
    $content =~ s!<span class="colorend">!!g;

    return $content;
}

sub preprocess (@) {
    my %params = @_;

    # Preprocess the text to expand any preprocessor directives
    # embedded inside it.
    $params{text} = IkiWiki::preprocess($params{page}, $params{destpage},
                IkiWiki::filter($params{page}, $params{destpage}, $params{text}));

    return preserve_style($params{foreground}, $params{background}, $params{text});
}

sub format (@) {
    my %params = @_;

    $params{content} = replace_preserved_style($params{content});
    return $params{content};    
}

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