#!/usr/local/bin/perl
#
# bibl-grep -- parse a HTML form request and return a smaller bib file
# Copyright (C) 1994 Bryan O'Sullivan
#
# Author: Andrew Condon <afcondon@dsg.cs.tcd.ie>
# Modified-By: Bryan O'Sullivan <bos@serpentine.com>
# $Revision: 1.2 $
# $Date: 1995/05/23 22:19:16 $
# $Source: /u/other/ugrad/bosullvn/lib/elisp/bibl-mode/RCS/bibl-grep,v $
#
# 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, 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.
#
# COMMENTARY:
#
# This Common Gateway Interface script parses a HTTP POST request, as
# sent by the likes of Mosaic.  Requests come in the form of single
# key words, and these are used to create a smaller bib file on the
# fly.  This smaller file contains only entries with the given key
# words, which is sent back to the requesting party as the result of
# the POST.
#
# This script has been tested under both NCSA and CERN httpds.  Since
# the current crop of httpds are pretty lame about providing useful
# information in the event of a problem, this sort of code is hard to
# debug.  Ugh.
#
# Install this script wherever you are supposed to put CGI programs on
# your system.
#
# NOTE: under the CERN and NCSA http daemons, this script is run with
# a minimal clue as to What's Going On.  Make sure all filenames in
# here are absolute, or this script will keel over!

$home = "/u/other/ugrad/bosullvn";

# This must point to wherever you have the slim-bibl-file program
# installed.

$biblgrep="$home/lib/elisp/bibl-mode/slim-bibl-file";

# This must point to wherever you have the bibl2html program
# installed.

$bibl2html="$home/bin/bibl2html";

# This must point to your bibliography file.

$bib = "$home/etc/bibliography";


# You shouldn't have to change anything below this point.


$length = $ENV{"CONTENT_LENGTH"} ||
    die "No content length given!";

read(STDIN, $query, $length) ||
    die "No data given!";

&url_decode($query);

foreach (split(/\\0/,$Decoded{'keywords'})){
    tr/A-Z/a-z/;
    $args .= " \"$_\" ";
}

$hgrep = `$biblgrep $args < $bib | $bibl2html`;
$length = (length $hgrep);

print<<EOF;
Content-Type: text/html
Content-Length: $length

$hgrep
EOF

# Url_decode splits up and de-munges a URL-encoded string.  Puts the
# resulting (key, value) pairs in the %Decoded associative array.

sub url_decode {
    local ($orig) = @_;
    local (@spl, @urls);
    local ($out, $val);

    @urls = split(/\&/, $orig);

    foreach $thing (@urls) {
	@spl = split(/=/, $thing);
	($val, $out) = @spl;
	$out =~ s/\+/ /g;
	$out =~ s/%(..)/pack("H2",$1)/ge;
	$Decoded{$val} = $out;
    }
}