#!/usr/local/bin/perl -w
# -*- cperl -*-
#
# gtk-doc - GTK DocBook documentation generator.
# Copyright (C) 1998  Damon Chaplin
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
#

#############################################################################
# Script      : gtkdoc-fixxref
# Description : This fixes cross-references in the HTML documentation.
#############################################################################

use strict;
use bytes;
use Getopt::Long;

# Options

# name of documentation module
my $MODULE;
my $MODULE_DIR;
my $HTML_DIR = "";
my @EXTRA_DIRS;
my $PRINT_VERSION;

my %optctl = (module => \$MODULE,
	      'module-dir' => \$MODULE_DIR,
	      'html-dir' => \$HTML_DIR,
	      'extra-dir' => \@EXTRA_DIRS,
	      'version' => \$PRINT_VERSION);
GetOptions(\%optctl, "module=s", "module-dir=s", "html-dir=s", "extra-dir=s@",
	"version");

if ($PRINT_VERSION) {
    print "1.1\n";
    exit 0;
}

# This contains all the entities and their relative URLs.
my %Links;

&ScanIndices ($HTML_DIR);
foreach my $dir (@EXTRA_DIRS) {
  &ScanIndices ($dir);
}

&FixCrossReferences (defined $MODULE_DIR ? $MODULE_DIR : "$HTML_DIR/$MODULE");

sub ScanIndices {
    my ($scan_dir) = @_;
#    print "Scanning source directory: $scan_dir\n";

    # This array holds any subdirectories found.
    my (@subdirs) = ();
    
    opendir (HTMLDIR, $scan_dir) || return;
    my $file;
    foreach $file (readdir (HTMLDIR)) {
	if ($file eq '.' || $file eq '..') {
	    next;
	} elsif (-d "$scan_dir/$file") {
	    push (@subdirs, $file);
	} elsif ($file eq "index.sgml") {
	    &ScanIndex ("$scan_dir/$file");
	}
    }
    closedir (HTMLDIR);

    # Now recursively scan the subdirectories.
    my $dir;
    foreach $dir (@subdirs) {
	&ScanIndices ("$scan_dir/$dir");
    }
}

sub ScanIndex {
    my ($file) = @_;
#    print "Scanning index file: $file\n";

    open (INDEXFILE, $file)
	|| die "Can't open $file: $!";
    while (<INDEXFILE>) {
	if (m/^<ANCHOR\s+id\s*=\s*"([^"]*)"\s+href\s*=\s*"([^"]*)"\s*>/) {
#	    print "Found id: $1 href: $2\n";
	    $Links{$1} = $2;
	}
    }	
    close (INDEXFILE);
}


sub FixCrossReferences {
    my ($scan_dir) = @_;

    opendir (HTMLDIR, $scan_dir)
	|| die "Can't open HTML directory $scan_dir: $!";
    my $file;
    foreach $file (readdir (HTMLDIR)) {
	if ($file eq '.' || $file eq '..') {
	    next;
	} elsif ($file =~ m/.html?$/) {
	    &FixHTMLFile ("$scan_dir/$file");
	}
    }
    closedir (HTMLDIR);
}


sub FixHTMLFile {
    my ($file) = @_;
#    print "Fixing file: $file\n";

    open (HTMLFILE, $file)
	|| die "Can't open $file: $!";
    undef $/;
    my $entire_file = <HTMLFILE>;
    close (HTMLFILE);

    $entire_file =~ s%<GTKDOCLINK\s+HREF="([^"]*)"\s*>(.*?)</GTKDOCLINK\s*>% &MakeXRef($1, $2); %ge;

    open (NEWFILE, ">$file.new")
	|| die "Can't open $file: $!";
    print NEWFILE $entire_file;
    close (NEWFILE);

    unlink ($file)
	|| die "Can't delete $file: $!";
    rename ("$file.new", $file)
	|| die "Can't rename $file.new: $!";
}


sub MakeXRef {
    my ($id, $text) = @_;

    my $href = $Links{$id};
    if ($href) {
	return "<a\nhref=\"../$href\"\n>$text</a>";
    } else {
	return $text;
    }
}