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|
#! /usr/bin/perl
#
# xcfview: a wrapper script that uses xcftools and an external viewer
# to display XCF images. The external viewer is found through the
# mailcap(5) database (q.v.).
#
# Written by Henning Makholm <henning@makholm.net>
# Derived from the run-mailcap script by Brian White <bcwhite@pobox.com>
#
# This script has been placed in the public domain (by both authors)
#
# We cannot use run-mailcap as-is because we can supply the flattened
# image either as PNG and PPM, and we need to find the highest-ranked
# viewer that can handle _one_ of these two. If everything else is equal
# we try to prefer a PNG viewer such that transparency is handled properly.
#
use strict ;
use warnings ;
my $debug=0;
my $quotedsemi = "\001" ;
my $quotedprct = "\002" ;
sub ReadMailcap {
my($file) = @_;
my $line = "";
return unless -r $file;
print STDERR " - Reading mailcap file \"$file\"...\n" if $debug;
open(MAILCAP,"<$file") || die "Error: could not read \"$file\" -- $!\n";
my @mailcap ;
while (<MAILCAP>) {
chomp;
s/^\s+// if $line;
$line .= $_;
next unless $line;
if ($line =~ m/^\s*\#/) {
$line = "";
next;
}
if ($line =~ m/\\$/) {
$line =~ s/\\$//;
} else {
$line =~ s/\\;/$quotedsemi/go;
$line =~ s/\\%/$quotedprct/go;
push @mailcap,$line;
$line = "";
}
}
close MAILCAP;
return @mailcap ;
}
sub TempFile {
my($match) = @_;
my($cmd,$head,$tail,$tmpfile);
($head,$tail) = split(/%s/,$1,2)
if ($match =~ m/nametemplate=(.*?)\s*($|;)/);
$cmd = "tempfile --mode=600";
$cmd .= " --prefix $head" if $head;
$cmd .= " --suffix $tail" if $tail;
$tmpfile = `$cmd`;
chomp($tmpfile);
return $tmpfile;
}
my ($useline,$usecomm,$useprogram,$usetype,@converter) ;
foreach my $mailcap ( $ENV{MAILCAPS} ? split(/:/,$ENV{MAILCAPS}) :
( "$ENV{HOME}/.mailcap",
qw( /etc/mailcap
/usr/local/etc/mailcap
/usr/share/etc/mailcap
/usr/etc/mailcap
) ) ) {
foreach ( ReadMailcap($mailcap) ) {
my ($type,$comm,$program,$rest)
= m"^image/(png|x-portable-pixmap)\s*;\s*((\S*).*?)\s*($|;.*)"
or next ;
print STDERR " - checking $mailcap entry \"$_\"\n" if $debug;
next if $rest =~ /;\s*needsterminal\s*($|;)/ ;
next if $rest =~ /;\s*copiousoutput\s*($|;)/ ;
if( $rest =~ m/;\s*test=(.*?)\s*($|;)/ ) {
my $test;
print STDERR " - running test: $1 " if $debug;
$test = system "$1 >/dev/null 2>&1";
$test >>= 8;
print STDERR " (result=$test=",($test!=0?"false":"true"),")\n"
if $debug;
next if $test ;
}
# If we get down here, we have a possible hit.
if( $type ne 'png' ) {
# Save for later; if there is a PNG definition for the same
# command, we will prefer PNG
($useline,$usecomm,$useprogram,$usetype,@converter)
= ($rest,$comm,$program,$type,"xcf2pnm","-c","'-#'")
unless @converter ;
next ;
} else {
# use this definition _unless_ we have already seen and saved
# a definition for a _different_ program (which must have been PPM)
($useline,$usecomm,$useprogram,$usetype,@converter)
= ($rest,$comm,$program,$type,"xcf2png")
unless @converter && $comm eq $useprogram ;
last ;
}
}
last if @converter ;
}
unless( @converter ) {
print STDERR "$0: No appropriate way to display PPM or PNG images in mailcap\n" ;
exit 1 ;
}
sub finishcomm() {
$usecomm =~ s!([^%])%t!$1$usetype!g;
$usecomm =~ s!%{(.*?)}!$_="'$ENV{$1}'";s/\`//g;$_!ge;
$usecomm =~ s!\\(.)!$1!g;
$usecomm =~ s!\'\'!\'!g;
$usecomm =~ s!$quotedsemi!;!go;
$usecomm =~ s!$quotedprct!%!go;
}
# quote arguments for converter
for( @ARGV ) {
next if m{^[-a-z0-9,.:/@%^+=_]+$}i ;
s/'/\\'/ ;
$_ = "'$_'" ;
}
if( $usecomm =~ /[^%]%s/ ) {
my $tempfile = TempFile($useline);
$usecomm =~ s/([^%])%s/$1$tempfile/g ;
finishcomm() ;
my $retcode = 0 ;
for my $comm ( join(" ",@converter,"-o",$tempfile,@ARGV),
$usecomm ) {
print STDERR " - executing: $comm\n" if $debug ;
my $res = system $comm;
$res = int($res/256);
if ($res != 0) {
print STDERR "Warning: program returned non-zero exit code \#$res\n";
$retcode = $res;
last ;
}
}
unlink $tempfile ;
exit $retcode ;
} else {
finishcomm() ;
exec( join(@converter," ",@ARGV) . " | " . $usecomm )
or print STDERR "Couldn't exec pipeline: $!\n" ;
exit 1 ;
}
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