#!/usr/bin/perl -w

# This is gimp-mkproxy, a perl script based on glib-mkenums.
# It makes proxy objects for libgimptool.

# gimp-mkproxy

my $in_skip = 0;
my $first_line = 1;
my $include;

sub parse_trigraph {
    my $opts = shift;
    my @opts;

    for $opt (split /\s*,\s*/, $opts) {
        $opt =~ s/^\s*//;
        $opt =~ s/\s*$//;
        my ($key,$val) = $opt =~ /([\w-]+)(?:=(.+))?/;
        defined $val or $val = 1;
        push @opts, $key, $val;
    }
    @opts;
}


sub version {
    print STDERR "gimp-mkproxy based on gimp-mkenums based on glib-mkenums version glib-2.0\n";
    print STDERR "gimp-mkproxy comes with ABSOLUTELY NO WARRANTY.\n";
    print STDERR "You may redistribute copies of gimp-mkenums under the terms\n";
    print STDERR "of the GNU General Public License which can be found in the\n";
    print STDERR "GIMP source package.";
    exit 0;
}
sub usage {
    print STDERR "Usage: gimp-mkproxy [options] [files...]\n";
    print STDERR "  --fhead <text>             output file header\n";
    print STDERR "  --fprod <text>             per input file production\n";
    print STDERR "  --ftail <text>             output file trailer\n";
    print STDERR "  --comments <text>          comment structure\n";
    print STDERR "  -h, --help                 show this help message\n";
    print STDERR "  -v, --version              print version informations\n";
    print STDERR "Production text substitutions:\n";
    print STDERR "  \@filename\@                 name of current input file\n";
    exit 0;
}

# production variables:
my $fhead = "";   # output file header
my $fprod = "";   # per input file production
my $ftail = "";   # output file trailer
# other options
my $comment_tmpl = "/* \@comment\@ */";

if (!defined $ARGV[0]) {
    usage;
}
while ($_ = $ARGV[0], /^-/) {
    shift;
    last if /^--$/;
    if    (/^--fhead$/)              { $fhead = $fhead . shift }
    elsif (/^--fprod$/)              { $fprod = $fprod . shift }
    elsif (/^--ftail$/)              { $ftail = $ftail . shift }
    elsif (/^--comments$/)           { $comment_tmpl = shift }
    elsif (/^--help$/ || /^-h$/)     { usage; }
    elsif (/^--version$/ || /^-v$/)  { version; }
    else { usage; }
}

# put auto-generation comment
{
    my $comment = $comment_tmpl;
    $comment =~ s/\@comment\@/Generated data (by gimp-mkproxy)/;
    print "\n" . $comment . "\n\n";
}

if (length($fhead)) {
    my $prod = $fhead;

    $prod =~ s/\@filename\@/$ARGV/g;
    $prod =~ s/\\a/\a/g; $prod =~ s/\\b/\b/g; $prod =~ s/\\t/\t/g; $prod =~ s/\\n/\n/g;
    $prod =~ s/\\f/\f/g; $prod =~ s/\\r/\r/g;
		
    print "$prod\n";
}

while (<>) {
    $include=0;

    if (m@/\*<
           (([^*]|\*(?!/))*)
          >\s*\*/
         @x) {
        my %options=parse_trigraph ($1);
        defined $options{'proxy-skip'}    and $in_skip = 1;
        defined $options{'proxy-resume'}  and $in_skip = 0;
        defined $options{'proxy-include'} and $include = 1;
        if ($options{'proxy-subst'}) {
            $_ = $options{'proxy-subst'} . "\n";
            $include = 1;
        }
    }
        

    # read lines until we have no open comments
    while (m@/\*([^*]|\*(?!/))*$@) {
	my $new;
	defined ($new = <>) || die "Unmatched comment in $ARGV";
	$_ .= $new;
    }

   # Spit out the output
	
    if (!$in_skip || $include) {        

        if ($first_line) {
            $first_line = 0;
	    
            if (length($fprod)) {
                my $prod = $fprod;

      	        $prod =~ s/\@filename\@/$ARGV/g;
	        $prod =~ s/\\a/\a/g; $prod =~ s/\\b/\b/g; $prod =~ s/\\t/\t/g; $prod =~ s/\\n/\n/g;
	        $prod =~ s/\\f/\f/g; $prod =~ s/\\r/\r/g;
	
	        print "$prod\n";
	    }
        }

        print;
   }
   
    if (eof) {
	close (ARGV);		# reset line numbering
	$first_line = 1;	# Flag to print filename at next line
	$in_skip = 0;
    }
}

if (length($ftail)) {
    my $prod = $ftail;

    $prod =~ s/\@filename\@/$ARGV/g;
    $prod =~ s/\\a/\a/g; $prod =~ s/\\b/\b/g; $prod =~ s/\\t/\t/g; $prod =~ s/\\n/\n/g;
    $prod =~ s/\\f/\f/g; $prod =~ s/\\r/\r/g;
		
    print "$prod\n";
}

# put auto-generation comment
{
    my $comment = $comment_tmpl;
    $comment =~ s/\@comment\@/Generated data ends here/;
    print "\n" . $comment . "\n\n";
}