#!/usr/bin/perl

# ***** BEGIN LICENSE BLOCK *****
# Version: MPL 1.1/GPL 2.0/LGPL 2.1
#
# The contents of this file are subject to the Mozilla Public License Version
# 1.1 (the "License"); you may not use this file except in compliance with
# the License. You may obtain a copy of the License at
# http://www.mozilla.org/MPL/
#
# Software distributed under the License is distributed on an "AS IS" basis,
# WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
# for the specific language governing rights and limitations under the
# License.
#
# The Original Code is Yerna Lindale.
#
# The Initial Developer of the Original Code is
# the Software Engineering Lab, INTEC, University Ghent.
# Portions created by the Initial Developer are Copyright (C) 2004
# the Initial Developer. All Rights Reserved.
#
# Contributor(s):
#   Kris De Schutter <kris.deschutter@ugent.be>
#
# Alternatively, the contents of this file may be used under the terms of
# either the GNU General Public License Version 2 or later (the "GPL"), or
# the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
# in which case the provisions of the GPL or the LGPL are applicable instead
# of those above. If you wish to allow use of your version of this file only
# under the terms of either the GPL or the LGPL, and not to allow others to
# use your version of this file under the terms of the MPL, indicate your
# decision by deleting the provisions above and replace them with the notice
# and other provisions required by the GPL or the LGPL. If you do not delete
# the provisions above, a recipient may use your version of this file under
# the terms of any one of the MPL, the GPL or the LGPL.
#
# ***** END LICENSE BLOCK *****

# This script guesses what format a Cobol source program is in.
#
# Return value is 1 for ANSI, 2 for TERMINAL.
#
# This tool is part of "Yerna Lindale" (old music).
#
# @author Kris De Schutter <kris.deschutter@ugent.be>
# @date Fri. March 12, 2004

use Getopt::Long;

# Options...
$help = 0;
$version = 0;
$quiet = 0;
$file_in = '';

# Process command line options...
GetOptions (
  'help|?' => \$help,
  'version' => \$version,
  'quiet' => \$quiet,
  'in:s' => \$file_in
) or usage ();

# Show help if requested...
if ($help) { usage (); }

# Show version info if requested...
if ($version) { version (); }

# Prepare input stream...
$fh_in = 'STDIN';
if ($file_in) {
  open (HANDLE_IN, $file_in) or file_not_found ($file_in);
  $fh_in = 'HANDLE_IN';
}

# "Normally, the compiler determines the source format automatically
# by examining the first character of the first non-blank line. If
# this character is blank or a digit, the file is assumed to be an
# ANSI file; otherwise it is assumed to be in terminal format. 

# Let's do some real work...
$line = "";
while (($line = <$fh_in>) =~ /^\s*$/) {}
close ($fh_in);

if ($line =~ /\@yl:format/) {
  # NORMALIZED.
  if (!$quiet) {
    print STDOUT ("$file_in is NORMALIZED formatted\n");
  }
  exit (0);

} elsif ($line =~ /^(\s|[0-9])/) {
  # Assume ANSI.
  if (!$quiet) {
    print STDOUT ("$file_in is ANSI formatted\n");
  }
  exit (1);

} else {
  # Assume TERMINAL.
  if (!$quiet) {
    print STDOUT ("$file_in is TERMINAL formatted\n");
  }
  exit (2);
}

# ===================================================================

sub usage {
  print STDERR ("Usage: guess_cobol_format [OPTIONS]...\n");
  print STDERR ("Where OPTIONS is one of:\n");
  print STDERR ("  -in FILE      read from FILE rather than STDIN\n");
  print STDERR ("  -quiet        don't print result on terminal\n");
  print STDERR ("  -version      show version information\n");
  print STDERR ("  -help         print this message\n");
  print STDERR ("\n");
  exit (0);
}

# ===================================================================

sub version {
  print STDERR ("This is \"guess_cobol_format\", version 0.0.1\n");
  print STDERR ("Part of Yerna Lindale (old music).\n");
  exit (0);
}

# ===================================================================

sub file_not_found {
  print STDERR ("File not found: $_[0]\n");
  exit (-101);
}
