#!/bin/sh
# $Id: config2man,v 1.3 2005/03/05 00:37:39 dasenbro Exp $
#
# Copyright (c) 2001 Carnegie Mellon University.  All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer. 
#
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in
#    the documentation and/or other materials provided with the
#    distribution.
#
# 3. The name "Carnegie Mellon University" must not be used to
#    endorse or promote products derived from this software without
#    prior written permission. For permission or any other legal
#    details, please contact  
#      Office of Technology Transfer
#      Carnegie Mellon University
#      5000 Forbes Avenue
#      Pittsburgh, PA  15213-3890
#      (412) 268-4387, fax: (412) 268-7395
#      tech-transfer@andrew.cmu.edu
#
# 4. Redistributions of any form whatsoever must retain the following
#    acknowledgment:
#    "This product includes software developed by Computing Services
#     at Carnegie Mellon University (http://www.cmu.edu/computing/)."
#
# CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
# THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
# AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
# FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
# AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
# OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
#
exec perl -x -S $0 ${1+"$@"} # -*-perl-*-
#!perl -w

if ($] !~ /^5\..*/) {
  # uh-oh. this isn't perl 5.
  foreach (split(/:/, $ENV{PATH})) { # try to find "perl5".
    exec("$_/perl5", "-x", "-S", $0, @ARGV) if (-x "$_/perl5");
  }
  # we failed. bail.
  die "Your perl is too old; I need perl 5.\n";
}

# load the real script. this is isolated in an 'eval' so perl4 won't
# choke on the perl5-isms.
eval join("\n", <DATA>);
if ($@) { die "$@"; }

__END__
require 5;

use strict;

sub print_values {
    my @values = eval $_[0];
    my $v;
    my $sep = " ";

    print "\nAllowed values:";
    foreach $v (@values) {
	print "$sep\\fI$v\\fR";
	$sep = ", ";
    }
    print "\n";
}

my $mode = 0;
my $save = "";
my $enums = "";

my $blank = "";
my $version = "\$Revision: 1.3 $blank";
$version =~ s/.Revision: (.*) /$1/;
print ".\\\" -*- nroff -*-\n";
print ".\\\" auto-generated by config2man $version\n";

while (<>) {
    if ($mode == 0) {
	# look for { option, default, type [enums] }; don't output until we
	# hit a comment
	if (m|{\s*\"(.*?)\"\s*,\s*\"?(.*?)\"?\s*,\s*(.*?)\s*(\(.*\))?\s*}|) {
	    my $opt = $1;
	    my $def = $2 eq "NULL" ? "<none>" : $2;
	    if ($def eq "") { $def = "<empty string>" }
	    $save = ".IP \"\\fB$1:\\fR $def\" 5\n";
	    $enums = $4;
	}

	# look for single-line comment
	elsif (m|/\*\s*(.*)\s*\*/|) {
	    print $save; $save = "";
	    print "$1\n";
	    if ($enums) { print_values($enums); }
	}

	# look for /* to shift into passthrough mode; print current
	# cached option header if any
	elsif (m|/\*\s*(.*)|) {
	    print $save; $save = "";
	    print $1;
	    print "\n"; # add LF so lines don't run together
	    $mode = 1;
	}
	else {
	    chomp;
	    #print "ignoring '$_'\n";
	}
    } elsif ($mode == 1) {
	# passthru; look for */ to end
	if (m|\s*(.*)\*/|) {
	    print $1;
	    print "\n";
	    if ($enums) { print_values($enums); }
	    $mode = 0; # back to search mode
	} elsif (m|\s*(.*)\s*|) {
	    print "$1\n";
	}
    }
}
