From d051555662292f8f6f00fe204591fd803fe28782 Mon Sep 17 00:00:00 2001
From: Jonas Smedegaard <dr@jones.dk>
Date: Sat, 4 Aug 2012 21:52:57 +0200
Subject: Add plugin img.

---
 IkiWiki/Plugin/img.pm | 214 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 214 insertions(+)
 create mode 100644 IkiWiki/Plugin/img.pm

diff --git a/IkiWiki/Plugin/img.pm b/IkiWiki/Plugin/img.pm
new file mode 100644
index 0000000..b92e24c
--- /dev/null
+++ b/IkiWiki/Plugin/img.pm
@@ -0,0 +1,214 @@
+#!/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 3.00;
+
+my %imgdefaults;
+
+sub import {
+	hook(type => "getsetup", id => "img", call => \&getsetup);
+	hook(type => "preprocess", id => "img", call => \&preprocess, scan => 1);
+}
+
+sub getsetup () {
+	return
+		plugin => {
+			safe => 1,
+			rebuild => undef,
+			section => "widget",
+		},
+}
+
+sub preprocess (@) {
+	my ($image) = $_[0] =~ /$config{wiki_file_regexp}/; # untaint
+	my %params=@_;
+
+	if (! defined $image) {
+		error("bad image filename");
+	}
+
+	if (exists $imgdefaults{$params{page}}) {
+		foreach my $key (keys %{$imgdefaults{$params{page}}}) {
+			if (! exists $params{$key}) {
+				$params{$key}=$imgdefaults{$params{page}}->{$key};
+			}
+		}
+	}
+
+	if (! exists $params{size} || ! length $params{size}) {
+		$params{size}='full';
+	}
+
+	if ($image eq 'defaults') {
+		$imgdefaults{$params{page}} = \%params;
+		return '';
+	}
+
+	add_link($params{page}, $image);
+	add_depends($params{page}, $image);
+
+	# optimisation: detect scan mode, and avoid generating the image
+	if (! defined wantarray) {
+		return;
+	}
+
+	my $file = bestlink($params{page}, $image);
+	my $srcfile = srcfile($file, 1);
+	if (! length $file || ! defined $srcfile) {
+		return htmllink($params{page}, $params{destpage}, $image);
+	}
+
+	my $dir = $params{page};
+	my $base = IkiWiki::basename($file);
+	my $issvg = $base=~s/\.svg$/.png/i;
+
+	eval q{use Image::Magick};
+	error gettext("Image::Magick is not installed") if $@;
+	my $im = Image::Magick->new($issvg ? (magick => "png") : ());
+	my $imglink;
+	my $r = $im->Read($srcfile);
+	error sprintf(gettext("failed to read %s: %s"), $file, $r) if $r;
+	
+	my ($dwidth, $dheight);
+
+	if ($params{size} ne 'full') {
+		my ($w, $h) = ($params{size} =~ /^(\d*)x(\d*)$/);
+		error sprintf(gettext('wrong size format "%s" (should be WxH)'), $params{size})
+			unless (defined $w && defined $h &&
+			        (length $w || length $h));
+		
+		if ((length $w && $w > $im->Get("width")) ||
+		    (length $h && $h > $im->Get("height"))) {
+		    	# resizing larger
+			$imglink = $file;
+
+			# don't generate larger image, just set display size
+			if (length $w && length $h) {
+				($dwidth, $dheight)=($w, $h);
+			}
+			# avoid division by zero on 0x0 image
+			elsif ($im->Get("width") == 0 || $im->Get("height") == 0) {
+				($dwidth, $dheight)=(0, 0);
+			}
+			# calculate unspecified size from the other one, preserving
+			# aspect ratio
+			elsif (length $w) {
+				$dwidth=$w;
+				$dheight=$w / $im->Get("width") * $im->Get("height");
+			}
+			elsif (length $h) {
+				$dheight=$h;
+				$dwidth=$h / $im->Get("height") * $im->Get("width");
+			}
+		}
+		else {
+			# resizing smaller
+			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 >= -M $outfile)) {
+				$im = Image::Magick->new;
+				$r = $im->Read($outfile);
+				error sprintf(gettext("failed to read %s: %s"), $outfile, $r) if $r;
+			}
+			else {
+				$r = $im->Resize(geometry => "${w}x${h}");
+				error sprintf(gettext("failed to resize: %s"), $r) if $r;
+
+				# don't actually write resized file in preview mode;
+				# rely on width and height settings
+				if (! $params{preview}) {
+					my @blob = $im->ImageToBlob();
+					writefile($imglink, $config{destdir}, $blob[0], 1);
+				}
+				else {
+					$imglink = $file;
+				}
+			}
+
+			# always get the true size of the resized image
+			$dwidth  = $im->Get("width"); 
+			$dheight = $im->Get("height");
+		}
+	}
+	else {
+		$imglink = $file;
+		$dwidth = $im->Get("width");
+		$dheight = $im->Get("height");
+	}
+	
+	if (! defined($dwidth) || ! defined($dheight)) {
+		error sprintf(gettext("failed to determine size of image %s"), $file)
+	}
+
+	my ($fileurl, $imgurl);
+	if (! $params{preview}) {
+		$fileurl=urlto($file, $params{destpage});
+		$imgurl=urlto($imglink, $params{destpage});
+	}
+	else {
+		$fileurl=urlto($file);
+		$imgurl=urlto($imglink);
+	}
+
+	if (! exists $params{class}) {
+		$params{class}="img";
+	}
+
+	my $attrs='';
+	foreach my $attr (qw{alt title class id hspace vspace}) {
+		if (exists $params{$attr}) {
+			$attrs.=" $attr=\"$params{$attr}\"";
+		}
+	}
+	
+	my $imgtag='<img src="'.$imgurl.
+		'" width="'.$dwidth.
+		'" height="'.$dheight.'"'.
+		$attrs.
+		(exists $params{align} && ! exists $params{caption} ? ' align="'.$params{align}.'"' : '').
+		' />';
+
+	my $link;
+	if (! defined $params{link}) {
+		$link=$fileurl;
+	}
+	elsif ($params{link} =~ /^\w+:\/\//) {
+		$link=$params{link};
+	}
+
+	if (defined $link) {
+		$imgtag='<a href="'.$link.'">'.$imgtag.'</a>';
+	}
+	else {
+		my $b = bestlink($params{page}, $params{link});
+	
+		if (length $b) {
+			add_depends($params{page}, $b, deptype("presence"));
+			$imgtag=htmllink($params{page}, $params{destpage},
+				$params{link}, linktext => $imgtag,
+				noimageinline => 1,
+			);
+		}
+	}
+
+	if (exists $params{caption}) {
+		return '<table class="img'.
+			(exists $params{align} ? " align-$params{align}" : "").
+			'">'.
+			'<caption>'.$params{caption}.'</caption>'.
+			'<tr><td>'.$imgtag.'</td></tr>'.
+			'</table>';
+	}
+	else {
+		return $imgtag;
+	}
+}
+
+1
-- 
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