#!/usr/local/bin/perl -w anew

use warnings;
use strict;

use Getopt::Std;
$Getopt::Std::STANDARD_HELP_VERSION = 1;

use Pod::Usage;

# ======================================================== SETUP

my $VERSION = v2.0.0;

my %options;
getopts('h', \%options);
HELP_MESSAGE() if $options{'h'};

my $filename_chosen = $ARGV[0];
die "No target filename chosen.  Try anew --help\n"
    unless $filename_chosen;

my %templates = (
    'pm'  => 'anew-mod.pm',
    'pmo' => 'anew-obj.pm',
    'pmf' => 'anewfunc.pm',
    'pl'  => 'anewmain.pl',
    'c'   => 'template.c',
    'ly'  => 'template.ly',
    'htm' => 'template.htm',
    'tex' => 'template.tex'
);

# ========================================================= MAIN

my ($extension_type) = (
    $filename_chosen =~ m/\.([^\.]*)$/
);

my $extension;
if ($extension_type) {
    die "Invalid extension.  Try anew --help\n"
        unless $templates{$extension_type};
    ($extension) = (
        $templates{$extension_type} =~ m/\.([^\.]*)$/
    );
} else {
    $extension = '';
    $extension_type = 'pl';
}

my $inputfile = $templates{$extension_type};
$filename_chosen =~ s/\.([^\.]*)$//;
my $outputfile = $filename_chosen;
$outputfile = "$outputfile.$extension" if $extension;

print "Creating $outputfile from $inputfile . . . .\n";

die "** ERROR ** File exists ** This program never overwrites.\n"
    if (-f $outputfile);

$inputfile = "/home/mccosar/share/anew/$inputfile";

open MODEL, "< $inputfile"
    or die "Couldn't open $inputfile : $!";
my @model = <MODEL>;
close MODEL;

open TARGET, "> $outputfile"
    or die "Can't open $outputfile : $!";
foreach (@model) {
    s/FILENAME/$outputfile/;
    print TARGET $_;
}
close TARGET;

print "File created.  Changing permissions . . . .\n";
my $perm = '600';
$perm = '700' if ($extension_type eq 'pl');
print `chmod -v $perm $outputfile`
    or die "Oops -- unable to chmod $perm $outputfile: $!";

print "Done.\n";

# ========================================================= SUBS

sub HELP_MESSAGE {
	pod2usage ( {
		-exit_status	=> 0,
		-verbose_level 	=> 1
	} );
}

sub VERSION_MESSAGE {
	return 1 if (lc $ARGV[0] eq "--help");
	print "This program is $0, ";
	printf "version %vd\n", $VERSION;
	printf "(Using Perl v%vd)\n", $^V;
	exit 0;
}

__END__

=head1 NAME

~/bin/anew

=head1 SYNOPSIS

    anew (filename.ext)

Creates a new file from an appropriate template, based on ext:

    .pl or none  :  executable perl file
    .pm          :  perl module
    .pmf         :  perl module (.pm), functional
    .pmo         :  perl module (.pm), objective
    .c           :  c source code
    .ly          :  GNU Lilypond leadsheet
    .htm         :  Elementary html document
    .tex         :  Basic .tex document

With no extension specified, anew assumes you want an executable
perl file.

=head1 OPTIONS

=over 4

=item -h, --help

Prints synopsis and options, then exits.

=item --version

Prints version information and exits.

=back

=head1 AUTHOR

Bruce H. McCosar.

=head1 COPYRIGHT

Copyright 2004 by Bruce H. McCosar.  All Rights Reserved.

This program is free software.  You may copy or distribute it
under the same terms as Perl itself.