#! /usr/local/bin/perl -w
# -*- Perl -*-
#
# bnamazu -- search with "namazu" and browse its results with a web browser.
# $Id: bnamazu.in,v 1.4.8.2 2004-09-19 03:37:44 opengl2772 Exp $
# 
# Copyright (C) 1998 Hajime BABA. All rights reserved.
#
# Modified by Satoru Takabayashi, 1998-1999.  No rights reserved.
#
#  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

use strict;

my $namazu = "namazu";
my $namazu_opts = "-h"; # default options for namazu
my $newwindow = 0;
my $browser = "lynx";   # default web browser

my $tmpdir = ".";
$tmpdir = "/tmp" if -d "/tmp";
$tmpdir = $ENV{"TMPDIR"} if defined $ENV{"TMPDIR"};

my $user = "unknown";
$user = $ENV{"USER"} if defined $ENV{"USER"};
$user = $ENV{"USERNAME"} if defined $ENV{"USERNAME"};

main();

sub main {
    my @args = parse_options();
    @args = map {"'$_'"} @args;

    my $results_html = "";
    if ($browser =~ /netscape/) {
	# It is not good to remove a tmpfile immediately after invoking
	# netscape. Because netscape requires the tmpfile to go back to it.
	# So, we should remove a previous tmpfile at this time.
	unlink_previous_netscape_tmpfile();  
	$results_html = "$tmpdir/.bnamazu-$user-netscape-$$.html";
    } else {
	$results_html = "$tmpdir/.bnamazu-$user-$$.html";
    }

    # invoke namazu
    my $cmd = "$namazu $namazu_opts @args > $results_html 2> /dev/null";
    system $cmd;

    # error handling
    if ($?) {
	print STDERR "$namazu: unknown error: $?\n";
	exit 1;
    }
	
    # browse the result!
    exec_browser($results_html);
    exit 0;
}

sub usage () {
    print <<EOUsage;
Usage: bnamazu [-n] [-b browser] [namazu's options] <query> [index]...

  -b browser    set your faborite browser for browsing. [lynx]
  -n            open a new window when you browse with netscape.

Notes: Other options will be passed to namazu.
EOUsage

    exit 1;
}

sub parse_options () {
    usage() if @ARGV == 0;

    while (@ARGV) {
	if ($ARGV[0] eq "-n") {
	    $newwindow = 1;
	    shift @ARGV;
	} elsif ($ARGV[0] eq "-b" && defined $ARGV[1]) {
	    $browser = $ARGV[1];
	    shift @ARGV;
	    shift @ARGV;
	} elsif ($ARGV[0] =~ /^-b(.+)/) {
	    $browser = $1;
	    shift @ARGV;
	} else {
	    last;
	}
    }
    return @ARGV;
}

sub exec_browser ($) {
    my ($file) = @_;
    
    my $cmd = "";
    if ($browser =~ /netscape/i) {
	my $netscape_lockfile = "$ENV{\"HOME\"}/.netscape/lock";
	# if symbolic link exists
	if (-l $netscape_lockfile ) {
	    # browse result with netscape.
	    if ($newwindow) {
		$cmd = "$browser -noraise -remote 'openURL($file,new-window)'";
	    } else {
		$cmd = "$browser -remote 'openURL($file)'";
	    }
	} else {
	    # invoke new netscape as a background process.
	    $cmd = "$browser $file &";
	}
    } else {
        # remove tmpfile immediately after a browser exits.
	$cmd = "$browser $file; rm -f $file";
    }

    # go!
    system $cmd;
}    

sub unlink_previous_netscape_tmpfile () {
    my @tmpfiles = glob "$tmpdir/.bnamazu-$user-netscape-[-0-9]*.html";
    unlink @tmpfiles;
}