#!/bin/sh
#
# Copyright (c) 1994-2008 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 legal
#    details, please contact
#      Carnegie Mellon University
#      Center for Technology Transfer and Enterprise Creation
#      4615 Forbes Avenue
#      Suite 302
#      Pittsburgh, PA  15213
#      (412) 268-7393, fax: (412) 268-7395
#      innovation@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 $opt;

my $blank = "";
my $version = "\$Revision: 1.6 $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*}|) {
            $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); }
            $opt = undef;
        }

        # look for /* to shift into passthrough mode; print current
        # cached option header if any
        elsif (m|/\*\s*(.*)|) {
            print $save; $save = "";
            if (defined $opt) { print ".RS 5\n"; }
            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
            if (defined $opt) { print ".RE\n"; }
            $opt = undef;
        } elsif (m|\s*(.*)\s*|) {
            print "$1\n";
        }
    }
}
