#!/usr/bin/env perl

use 5.01;
use strict;
use warnings;
use version; our $VERSION = qv( '0.6' );

use English qw( -no_match_vars );

my $message_file = $ARGV[ 0 ]; my $change_file = 'Changes';

if (-f $change_file) {
   open my $in, '<', $message_file
      or die "Path ${message_file} cannot open: ${OS_ERROR}";

   my $message; { local $RS = undef; $message = <$in> }; close $in;

   if (length $message < 3) {
      open $in, '<', $change_file
         or die "File ${change_file} cannot open: ${OS_ERROR}";

      my $changes; { local $RS = undef; $changes = <$in> }; close $in;
      my ($entry) = $changes =~ m{ [\n][\n] (.*?) [\n][\n] }msx;

      $message = (map    { s{ \A [ \t]+ [\-] \s* }{}mx; $_ }
                  grep   { m{ \A [ \t]             }mx     }
                  split    m{    [\n]              }mx,
                            ($entry || ' - Updated'))[ 0 ];
   }

   $message = substr $message, 0, 53;

   open my $out, '>', $message_file
      or die "Path ${message_file} cannot open: ${OS_ERROR}";
   print {$out} $message; close $out;
}

exit 0;