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 2.00;

my %imgdefaults;

sub import { #{{{
    hook(type => "preprocess", id => "img", call => \&preprocess, scan => 1);
} #}}}

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 '';
    }

    push @{$links{$params{page}}}, $image;
    # optimisation: detect scan mode, and avoid generating the image
    if (! defined wantarray) {
        return;
    }

    my $file = bestlink($params{page}, $image);

    my $dir = $params{destpage};
    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 ".sprintf(gettext('bad size "%s"'), $size)."]]"
            unless (defined $w && defined $h);

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

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

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

            # don't actually write file in preview mode
            if (! $params{preview}) {
                my @blob = $im->ImageToBlob();
                writefile($imglink, $config{destdir}, $blob[0], 1);
            }
            else {
                $imglink = $file;
            }
        }
    }
    else {
        $r = $im->Read(srcfile($file));
        return "[[img ".sprintf(gettext("failed to read %s: %s"), $file, $r)."]]" if $r;
        $imglink = $file;
    }

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

    my ($fileurl, $imgurl);
    if (! $params{preview}) {
        $fileurl=urlto($file, $params{destpage});
        $imgurl=urlto($imglink, $params{destpage});
    }
    else {
        $fileurl="$config{url}/$file";
        $imgurl="$config{url}/$imglink";
    }

    if (! defined($im->Get("width")) || ! defined($im->Get("height"))) {
        return "[[img ".sprintf(gettext("failed to determine size of image %s"), $file)."]]";
    }

    my $imgtag='<img src="'.$imgurl.
        '" alt="'.$alt.'" width="'.$im->Get("width").
        '" height="'.$im->Get("height").'"'.
        (exists $params{class} ? ' class="'.$params{class}.'"' : '').
        (exists $params{id} ? ' id="'.$params{id}.'"' : '').
        ' />';

    if (! defined $params{link} || lc($params{link}) eq 'yes') {
        return  '<a href="'.$fileurl.'">'.$imgtag.'</a>';
    }
    elsif ($params{link} =~ /^\w+:\/\//) {
        return  '<a href="'.$params{link}.'">'.$imgtag.'</a>';
    }
    elsif (length bestlink($params{page}, $params{link})) {
        add_depends($params{page}, $params{link});
        return htmllink($params{page}, $params{destpage},
            $params{link}, linktext => $imgtag,
            noimageinline => 1);
    }
    else {
        return $imgtag;
    }
} #}}}

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