path: root/IkiWiki/Plugin/img.pm

#!/usr/bin/perl
# Ikiwiki enhanced image handling plugin
# Christian Mock cm@tahina.priv.at 20061002
package IkiWiki::Plugin::img;

use warnings;
use strict;
use IkiWiki;

my %imgdefaults;

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

sub preprocess (@) { #{{{
    my ($image) = $_[0] =~ /$config{wiki_file_regexp}/; # untaint
    my %params=@_;

    if (! exists $imgdefaults{$params{page}}) {
        $imgdefaults{$params{page}} = {};
    }
    my $size = $params{size} || $imgdefaults{$params{page}}->{size} || 'full';
    my $alt = $params{alt} || $imgdefaults{$params{page}}->{alt} || '';

    if ($image eq 'defaults') {
        $imgdefaults{$params{page}} = {
            size => $size,
            alt => $alt,
        };
        return '';
    }

    add_depends($params{page}, $image);
    my $file = bestlink($params{page}, $image) || return "[[img $image not found]]";

    my $dir = IkiWiki::dirname($file);
    my $base = IkiWiki::basename($file);

    eval q{use Image::Magick};
    error($@) if $@;
    my $im = Image::Magick->new;
    my $imglink;
    my $r;

    if ($size ne 'full') {
        my ($w, $h) = ($size =~ /^(\d+)x(\d+)$/);
        return "[[img bad size \"$size\"]]" unless (defined $w && defined $h);

        my $outfile = "$config{destdir}/$dir/${w}x${h}-$base";
        $imglink = "$dir/${w}x${h}-$base";
        will_render($params{page}, $imglink);

        if (-e $outfile && (-M srcfile($file) >= -M $outfile)) {
            $r = $im->Read($outfile);
            return "[[img failed to read $outfile: $r]]" if $r;
        }
        else {
            $r = $im->Read(srcfile($file));
            return "[[img failed to read $file: $r]]" if $r;

            $r = $im->Resize(geometry => "${w}x${h}");
            return "[[img failed to resize: $r]]" if $r;

            my @blob = $im->ImageToBlob();
            writefile($imglink, $config{destdir}, $blob[0], 1);
        }
    }
    else {
        $r = $im->Read(srcfile($file));
        return "[[img failed to read $file: $r]]" if $r;
        $imglink = $file;
    }

    add_depends($imglink, $params{page});

    return '<a href="'.
        IkiWiki::abs2rel($file, IkiWiki::dirname($params{destpage})).
        '"><img src="'.
        IkiWiki::abs2rel($imglink, IkiWiki::dirname($params{destpage})).
        '" alt="'.$alt.'" width="'.$im->Get("width").
        '" height="'.$im->Get("height").'" /></a>';
} #}}}

1;