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#!/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();
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}) {
$im->set($issvg ? (magick => 'png') : ());
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;
}
}
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