#!/usr/bin/perl
# $Id: search,v 1.3 1998/04/30 11:58:16 argggh Exp $

# search --	Freetext search
#
#	Arne Georg Gleditsch <argggh@ifi.uio.no>
#	Per Kristian Gjermshus <pergj@ifi.uio.no>
#
#
# 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., 675 Mass Ave, Cambridge, MA 02139, USA.

######################################################################

use lib 'lib/';
use LXR::Common;
use LXR::Config;

$maxhits = 1000;

sub search {
    print("<p align=center>\n",
	  "This searchpage is powered by ",
	  "<a href=\"http://glimpse.cs.arizona.edu\">Glimpse</a>\n");

    print("<form method=get action=\"search\">\n");

    foreach ($Conf->allvariables) {
	if ($Conf->variable($_) ne $Conf->vardefault($_)) {
	    print("<input type=hidden name=\"",$_, "\" ",
		  "value=\"", $Conf->variable($_), "\">\n");
	}
    }

    print("Search for: <input type=text name=\"string\" ",
	  "value=\"",$searchtext,"\" size=60>\n",
	  "<input type=submit value=\"search\">\n",
#	  $Query->checkbox("case",0,0,"Case sensitive search"),
#	  $Query->checkbox("regexp",1,0,"Regular expression search"),
#	  $Query->popup_menu("fuzz",[0,1,2,3,4,5,6,7],0),
	  "</form>\n",

	  "<a href=\"search_help.html\">Hints</a> ",
	  "making queries.\n");
    
    $| = 1; print('');

    if ($searchtext ne "") {
	print("<hr>\n");
	unless (open(GLIMPSE, "-|")) {
	    open(STDERR, ">&STDOUT");
	    $!='';
	    exec($Conf->glimpsebin,"-H".$Conf->dbdir,'-y','-n',$searchtext);
	    print("Glimpse subprocess died unexpextedly: $!\n");
	    exit;
	}

	$numlines = 0;
	while (<GLIMPSE>) {
	    $numlines++;
	    push(@glimpselines,$_);
	    if ($numlines > $maxhits) {
		last;
	    }
	}

	close(GLIMPSE);

	$retval = $? >> 8;

	# The manpage for glimpse says that it returns 2 on syntax errors or
	# inaccessible files. It seems this is not the case. 
	# We will have to work around it for the time being.
    
	if ($retval == 0) {
	    if (@glimpselines == 0) {
		print("No matching files<br>\n");
	    } else {
		if ($numlines > $maxhits) {
		    print("<b> Too many hits, displaying first $maxhits</b><br>\n");
		}
		print("<h1>$searchtext</h1>\n");
		$sourceroot = $Conf->sourceroot;
		foreach $glimpseline (@glimpselines) {
		    
		    $glimpseline =~ s/$sourceroot//;
		    ($file, $line, $text) = 
			$glimpseline =~ /(.*?):\s*(\d+)\s*:(.*)/;
		    $text =~ s/&/&amp;/g;
		    $text =~ s/</&lt;/g;
		    $text =~ s/>/&gt;/g;

		    print(&fileref("$file, line $line", "/$file", $line),
			  " -- $text<br>\n");
		}
	    }
	} elsif ($retval == 1) {
	    $glimpsebin = $Conf->glimpsebin;
	    $glimpseresponse = join("<br>",@glimpselines);
	    $glimpseresponse =~ s/$glimpsebin/Reason/;
	    $glimpseresponse =~ s/glimpse: error in searching index//;
	    print("<b>Search failed</b><br>\n$glimpseresponse");
	} else {
	    print("Unexpected returnvalue $retval from Glimpse\n");
	}
    }
}

($Conf, $HTTP, $Path) = &init;
$searchtext = $HTTP->{'param'}->{'string'};

&makeheader('search');
&search;
&makefooter('search');