#!/usr/local/bin/perl
#
# bibl2html -- convert a bibliography file to HTML
# Copyright (C) 1994 Bryan O'Sullivan
#
# Author: Bryan O'Sullivan <bos@serpentine.com>
# Keywords: bibliographies, databases, World Wide Web
# $Revision: 1.3 $
# $Date: 1995/05/23 22:12:47 $
# $Source: /u/other/ugrad/bosullvn/lib/elisp/bibl-mode/RCS/bibl2html,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 script converts a bibl-mode file into a HTML file with
# hyperlinks.  Probably not very useful to anyone, but it beats
# doing real work ;-)
#
# You should edit the header and footer text portions of this file
# before running it yourself, and then run as follows:
#	bibl2html [bibliography-file] [html-file]
# Defaults are to read from stdin and write to stdout.
#
# If you are including inline HTML, be sure to escape the angle
# brackets you use with backslashes.

require 5.000;

# Set this to wherever your bibl-grep program lives.  But note that
# the form this string takes must be a URL!

$biblgrep = "http://www.maths.tcd.ie/cgi-bin/bibl-grep";

# The only bits you should need to tweak below this are

# Open the source and target files.

$bibl = $#ARGV >= 0 ? $ARGV[0] : "-";
$html = $#ARGV >= 1 ? $ARGV[1] : "-";

open(BIBL, "<$bibl")
    or die "$bibl: $!";

open(HTML, ">$html")
    or die "$html: $!";
     

# Skip past the bib file header.

while (<BIBL> ne "\f\n") {
    # do nothing
}

$l = "&lt;";
$g = "&gt;";
$date = `date`;

loop: while ($line = <BIBL>) {
    # Blank lines are record separators.
    
    if ($line eq "\n" && $in_record) {
	$html_Output .= "</DL>\n<HR>\n\n";
	$in_record = $location = 0;	# reset flags
	next loop;
    }
    
    # We don't want to print the dates of record modifications.
    
    if ($line =~ /^(Record|Updated):/) {
	next loop;
    }

    # Change angle brackets to their HTML equivalents.
    
    $line =~ s/</$l/g unless ($line =~ /\\(\\\\)*</);
    $line =~ s/>/$g/g unless ($line =~ /\\(\\\\)*>/);
    $line =~ s/\\(.)/$1/g;

    $in_record = 1;			# we are inside a record

    # Special case headers.  A record name gets a level-2 HTML header.
    
    if ($line =~ /^Name:\s(.*)$/) {
	$name = $1;
	$idx_name = $name;
	$idx_name =~ s/^(The|A|An)[\s]+(.*)/\u\2, \l\1/i;
	$link = $idx_name;
	$link =~ s/[-\s_,.:]+/-/g;
	$link =~ tr/A-Z/a-z/;
	
	$html_Output .= sprintf("<H2> <A NAME=\"%s\">%s</A> </H2>\n<P>\n<DL>\n",
			 $link, $name);
	$name_index[++$#name_index] = "<A HREF=\"#$link\">$idx_name</A><BR>\n";
	next loop;
    }

    # We only output the `Location' header once per record.  Make
    # entries under such headers be hyperlinks.
	
    if ($line =~ /^Location:\s(.*)$/) {
	if (!$location) {
	    $html_Output .= "<DT>\n<B> Location </B>\n<DD>\n<A HREF=\"$1\">$1</A>\n";
	    $location = 1;
	} else {
	    $html_Output .= "<DD>\n<A HREF=\"$1\">$1</A>\n";
	}
	next loop;
    }

    if ($line =~ /^Keywords:\s(.*)$/) {
	$keywords .= "$1, ";
	$html_Output .= "<DT>\n<B> Key words </B>\n<DD>\n$1\n";
	next loop;
    }
    
    # Other headers.
    
    if ($line =~ /^([a-zA-Z]+):\s(.*)$/) {
	$html_Output .= "<DT>\n<B> $1 </B>\n<DD>\n$2\n";
	next loop;
    }

    $html_Output .= $line;
}

# End of file.

if ($in_record) {
    $html_Output .= "</DL>\n";
}

# Mess with our indices.

@name_index = sort {$a cmp $b;} @name_index;

@keywords = split(/,\s/, $keywords);
@keywords = sort no_case @keywords;

# Keep unique key words.

for ($i = 1; $i < $#keywords; $i++) {
    if ((uc $keywords[$i]) ne (uc $keywords[$i-1])) {
	$keys[++$#keys] = $keywords[$i];
    }
}

$keywords = '<OPTION> ' . join('<OPTION> ', @keys);
$nkeys = $#keys + 1;

$nnames = $#name_index + 1;

# More header text.  Edit to suit.

$box_height = 10;

# You may wish to tweak the text below to follow your wishes.

print HTML <<END_OF_HEADER;
<HEAD>
<TITLE>Bryan's Pointers Phile</TITLE>
</HEAD>

<!-- Change this to your own email address. -->

<LINK rel=MADE HREF="mailto:bos\@serpentine.com">

<BODY>

<!-- Munge the next two paragraphs to suit yourself.  You don't *have*
     to credit me, but it would be nice if you did. -->

<H1>
Bryan's Pointers Phile
</H1>

<P>
This document is an automatically-translated HTML version of my
bibliography file, in which I keep track of all kinds of information,
both on the Internet and elsewhere.  It can be vaguely useful and
interesting to browse through.  The contents consist of a <I>lot</I>
of programming-related material, but there is a variety of other
stuff in there too.

<P>
There are currently $nnames records, and $nkeys keywords.
<BR>
Last updated: $date.
<P>    
<CENTER>

<!-- Change this address to suit yourself too. -->

<ADDRESS>
<A HREF="http://www.maths.tcd.ie/~bosullvn"><IMG
SRC="http://www.maths.tcd.ie/~bosullvn/icons/me.gif" ALIGN=MIDDLE BORDER=0 WIDTH=76 HEIGHT=121>
Bryan O'Sullivan</A>
</ADDRESS>
</CENTER>

<HR>

<H1> <A NAME="Sorted-Key-Word-Index">Sorted key word index</A> </H1>

<P>

<FORM METHOD="POST" ACTION="$biblgrep">
  <SELECT NAME="keywords" MULTIPLE SIZE=$box_height ALIGN=MIDDLE>
  $keywords
  </SELECT>
  <P>
  To narrow down the number of records being displayed, choose a keyword
  from the list above, 
  and press the <INPUT TYPE="submit" VALUE="submit"> button.
  To reset the form, press the <INPUT TYPE="reset" VALUE="reset"> button.
</FORM>

<HR>

<H1> <A HNAME="Sorted-Name-Index">Sorted record name index</A> </H1>

<P>
@name_index
<P>

<HR>

END_OF_HEADER

# No more user-serviceable parts beyond this point.

print HTML $html_Output;

print HTML <<END_OF_FOOTER;
</BODY>
END_OF_FOOTER
sub no_case {
    local ($x) = $a;
    local ($y) = $b;

    $x =~ tr/A-Z/a-z/;
    $y =~ tr/A-Z/a-z/;

    return $x cmp $y;
}