#!/usr/bin/env perl -w
# *************************************************************
#  
#  Licensed to the Apache Software Foundation (ASF) under one
#  or more contributor license agreements.  See the NOTICE file
#  distributed with this work for additional information
#  regarding copyright ownership.  The ASF licenses this file
#  to you under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
#  
#  Unless required by applicable law or agreed to in writing,
#  software distributed under the License is distributed on an
#  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
#  KIND, either express or implied.  See the License for the
#  specific language governing permissions and limitations
#  under the License.
#  
# *************************************************************
#
# langwrap - language wrapper for building resources
#
# $Id$

use Getopt::Std;

###### globals ######

$is_debug = 0;
$nfield   = 0;
@LoL 	  = ();
@command  = ();

###### main ######

# Version
$idStr = ' $Revision: 1.2 $ ';
$idStr =~ /Revision:\s+(\S+)\s+\$/
    ? ($langwrapRev = $1) : ($langwrapRev = "-");

print "langwrap -- Version: $langwrapRev\n";

# Options
&check_options();

# parse command file
&parse_commandfile($opt_c);

# create list with command lines
&create_commands();

# finally execute commands
foreach $cmd (@command) {
    if ($is_debug) {
	print $cmd . "\n";
    } else {
	system($cmd);
	$res = $? >> 8;
	if ($res) {
	    print "langwrap: command execution failed with exitcode $res.\n";
	    exit($res);
	}
    }
}

exit(0);
 
###### routines ######

### parse_commandfile()
sub parse_commandfile {
    my($file) = shift;
    my(@field);
    
    open(COMMAND, "<$file") or die "can´t open $file";

    while (<COMMAND>) {
	$line = $_;
	chomp($line);
	if ( ($line =~ //) || ($line =~ /^\r/) || ($line =~ /^#/) ) {
	    next;
	}
						   
	@field = split " ", $line;
	push @LoL, [@field];
	if (!$nfield) {
	    $nfield = $#field + 1;
	} else {
	    if ( $nfield != ($#field + 1) ) {
		print "langwrap: error in <cmdfile>: every row must ";
		print "have the same # of columns.\n";
		exit(3);
	    }
	}
    }
    
    close(COMMAND);
}

### create_command()
sub create_commands() {
    my($cmd, $cmdline, $arg_string, $ntempl);

    $cmd = shift @ARGV;
    $arg_string = join(" ", @ARGV);
    # just count the number of templates
    $ntempl = ($arg_string =~ s/@\d+@/$&/eg);
    if ( $ntempl >= $nfield ) {
	print "lnagwrap: # of templates > # of fields in <cmdfile>.\n";
	exit(4);
    }

    # create command lines
    for $i (0..$#LoL) {
	$cmdline = $arg_string;
	$cmdline =~ s/@(\d+)@/$LoL[$i][$1]/eg;
	push @command, $cmd . " " . $cmdline;
    }
}
    
### check_options()
sub check_options {

    if ( !getopts('c:') ) {
	&usage();
    }

    if ( !$opt_c ) {
	&usage();
    }

    if ( ! -r $opt_c ) {
	print "langwrap: $opt_c is not a readable file.\n";
	exit(2);
    }

    if ( $#ARGV < 1 ) {
	print "langwrap: empty <template_string>.\n";
	&usage();
    }
}

### usage()
sub usage {
    print "Usage: langwrap -c cmdfile tool <template_string>\n";
    print "<template_string> is of form: ...\@1\@ .... \@2\@...\n";
    print "with \@<n>\@ template #n\n";
    exit(1);
}