#! /usr/local/bin/perl -w
# -*- Perl -*-
# lnnmz - program to make NMZ.field.link
# $Id: lnnmz.in,v 1.1.4.5 2005-09-24 12:25:07 opengl2772 Exp $
#
# Copyright (C) 2000 osamu2001@livedoor.com  All rights reserved.
# Copyright (C) 2000 furukawa@tcp-ip.or.jp  All rights reserved.
# Copyright (C) 2001 Hajime BABA  All rights reserved.
# Copyright (C) 2001-2005 Namazu Project  All rights reserved.
#     This is free software with ABSOLUTELY NO WARRANTY.
#
#  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 versions 2, 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
#
#  This file must be encoded in EUC-JP encoding
#

package lnnmz;

use strict;
use English;
use Cwd;
use File::Spec;

my $PKGDATADIR = $ENV{'pkgdatadir'} || "/usr/local/share/namazu";
push(@INC, $PKGDATADIR . "/pl");
require 'nmzidx.pl';

sub rel2abs($;$);

# for example
my %inv_replace = (
	       "http://www.apache.org" => "/home/httpd/html",
	       );

my $backup;
while (@ARGV && $ARGV[0] =~ s/^\-//){
    my $argv = shift;

    &usage, exit if $argv eq '-help';
    $backup = 0, next if $argv eq '-no-backup';

    while ($argv =~ s/^(.)//){
        $backup = 0 if $1 eq 'b';
    }
}

if (@ARGV){
    for my $argv (@ARGV){
        $argv =~ s/NMZ$// unless -d $argv;
        $argv = '.' if $argv eq '';
        &lnnmz($argv, $backup);
    }
} else {
    &lnnmz('.', $backup);
}

exit(0);


# main routine
sub lnnmz{
    my ($dir, $backup) = @_;

    if (! -f "$dir/NMZ.i") {
        print "Cannot open index. : $dir\n";
        return;
    }
    my $nmzi = new nmzidx($dir, 'r');
    my $fh = $nmzi->open_flist;
    unless (defined $fh->{'t'}) {
        $fh->close;
        $nmzi->close;
        return;
    }
    my $nmzo = new nmzidx($dir, 'w');
    my $fo = $nmzo->open_field('link');
    my %list_f;
    while (defined $fh->read(\%list_f)){
        my $fname = $list_f{'r'};
#	print "@@ $fname\n";

        open(F, $fname) || die;
	my @href = get_href($fname, <F>);
	close(F);

	my $tmp = join(" ", @href);
	$fo->{'link'}->putline("$tmp\n");
#	print "@@ $tmp\n";
    }
    $nmzo->replace_db($backup);
    $nmzi->close;
}

# mmm... tooooooooo dirty, but it seems to work good. X-(
# Pls clean up the code!
sub get_href {
    my ($fname, @lines) = @_;
    my ($basedir, $file) = splitpath($fname);
    my (@href, %count);

    foreach my $line (@lines) {
	if ($line =~ /<a\s[^>]*href=([\"\'])(.*?)\1/ig) { #"
	    my $href = $2;
	    next if ($href =~ /^(ftp|mailto):/); # only http: or file:
	    if (($href !~ m:^/:) && ($href !~ m/^http:/)) {
		$href = rel2abs($href, $basedir);
		$href = canonpath($href) ;
	    }
	    $href =~ s/#.*$//g;
	    $href =~ s:([^/]*)/\.\.::g;
	    foreach my $url (sort keys %inv_replace) {
		my $dir = $inv_replace{$url};
		$href =~ s:^$url:$dir:g;
		$href =~ s:^/$:$dir/index.html:g;
	    }
	    $href =~ s:/$:/index.html:g;
	    $href =~ s:/\.$:/index.html:g;
	    if ($href !~ m/^http:/) {
		$href = canonpath($href) ;
	    }
	    push(@href, $href) unless $count{$href};
	    $count{$href}++;
	}
    }
    {
	# uniq and sort
	my %count;
	@href = grep(!$count{$_}++, @href);
	@href = sort {$count{$a} <=> $count{$b}} @href;
    }
    return @href;
}


# Splits a path into directory and filename portions.
sub splitpath($) {
    my ($path) = @_;
    my ($dir, $file) = ('', '');

    $path =~ m|^ ( (?: .* / (?: \.\.?\z )? )? ) ([^/]*) |xs;
    $dir  = $1;
    $file = $2;
#    print "dir=$dir, file=$file\n";
    return ($dir, $file);
}

# Converts a relative path to an absolute path. 
sub rel2abs($;$) {
    my ($path,$base ) = @_;

    # Clean up $path
    if ( ! File::Spec->file_name_is_absolute( $path ) ) {
        # Figure out the effective $base and clean it up.
        if ( !defined( $base ) || $base eq '' ) {
            $base = cwd() ;
        }
        elsif ( ! File::Spec->file_name_is_absolute( $base ) ) {
            $base = rel2abs( $base ) ;
        }
        else {
            $base = canonpath( $base ) ;
        }

        # Glom them together
        $path = File::Spec->catdir( $base, $path ) ;
    }

    return canonpath( $path ) ;
}

sub canonpath {
    my ($path) = @_;
    $path =~ s|/+|/|g unless($English::OSNAME eq 'cygwin'); # xx////xx  -> xx/xx
    $path =~ s|(/\.)+/|/|g;                        # xx/././xx -> xx/xx
    $path =~ s|^(\./)+||s unless $path eq "./";    # ./xx      -> xx
    $path =~ s|^/(\.\./)+|/|s;                     # /../../xx -> xx
    $path =~ s|/\z|| unless $path eq "/";          # xx/       -> xx
    return $path;
}

sub usage{
    print
        ("Usage: lnnmz [options] <target(s)>\n" .
         "  --help              show this help and exit.\n" .
         "  -b, --no-backup     do not backup original file.\n" 
         );
}

# EOF