# Blosxom Plugin: imagesizer
# Author: Nelson Minar <nelson@monkey.org>
# Version: 20030222
# http://www.nelson.monkey.org/~nelson/weblog/
# License: Public Domain

# Imagesizer is a Blosxom plugin that inserts width and height
# tags into images you include in your Blosxom entries.
# It requires the Perl module Image::Size, available from
#   http://www.blackperl.com/Image::Size/
#   (Or if you use Debian, apt-get install libimage-size-perl)

# Installation:
#   Modify the $rootURL and $docRoot variables below
#   Drop imagesizer in your plugins directory

# Known bugs:
#   You may have to modify the imgSrcToFile function
#   Does not gracefully handle more than one <img> tag in an entry
#   Perl gives me a rash, so the code is ugly.

package imagesizer;
use Image::Size 'html_imgsize';

# Root of URLs for your images
$rootURL = '^/~nelson/';

# Pathname those URLs map to
$docRoot = '/home/nelson/html/';       


# Sub to turn a URL into a filename. With the default config,
# this maps URLs like /~nelson/img/foo.gif into filenames like
# /home/nelson/html/img/foo.gif

sub imgSrcToFile {
    my ($src) = @_;
    if ($src =~ s!$rootURL!$docRoot!) {
        return $src;
    }
    return 0;
}



sub start {
    1;
}


# Debug output holder - debug output is commented out at the bottom.
$debug = '';

# Modify the body of stories by including image width and height tags
sub story {
    my($pkg, $path, $filename, $story_ref, $title_ref, $body_ref) = @_;
    $body = $$body_ref;

    # Find any <img> tag in the post body
    if ($body =~ m/(<img [^>]+>)/is) {
       $tag = $1;
       $debug .= "Tag: " . $tag . "\n";

       # Skip image tags that already have height or width specified
       return if ($tag =~ m/(width|height)=/i);

       # Grab the source out of the image tag
       $tag =~ m/<img .*?src="(.*?)".*?>/is;
       $debug .= "Src: " . $1 . "\n";


       # Ask Image::Size to give us width & height data
       $filename = imgSrcToFile($1);
       $debug .= "File: " . $filename . "\n";
       if (-r $filename) {
          $size = html_imgsize($filename);
          $debug .= "Size: " . $size . "\n";
       }
       # return if !$size;

       # And substitute it into the image
       $$body_ref =~ s/<img /<img $size /is;
       
       $debug .= "<br>\n";
    }
    1;
}

# Only needed for debug output
sub end {
    # print "<p>", $debug;
    1;
}

1;