App::Easer - Simplify writing (hierarchical) CLI applications


This document describes App::Easer version 2.006.

Build Status Perl Version Current CPAN version Kwalitee CPAN Testers CPAN Testers Matrix


   #!/usr/bin/env perl
   use v5.24;
   use experimental 'signatures';
   use App::Easer V2 => 'run';
   my $app = {
      aliases     => ['foo'],
      help        => 'this is the main app',
      description => 'Yes, this really is the main app',
      options     => [
            name        => 'foo',
            help        => 'option foo!',
            getopt      => 'foo|f=s',
            environment => 'FOO',
            default     => 'bar',
      execute => sub ($instance) {
         my $foo = $instance->config('foo');
         say "Hello, $foo!";
         return 0;
      default_child => '-self',    # run execute by default
      children => [
            aliases => ['bar'],
            help => 'this is a sub-command',
            description => 'Yes, this is a sub-command',
            execute => sub { 'Peace!' },
   exit run($app, $0, @ARGV);


NOTE: this software should be considered "late alpha" maturity. I'm mostly happy with the interface, but there are still a few things that might get changed. Anyway, if you find a release of App::Easer to work fine for you, it's fair to assume that you will not need to get a newer one later.

App::Easer provides the scaffolding for implementing hierarchical command-line applications in a very fast way.

Development today happens only in App::Easer::V2. The legacy interface is still available in App::Easer::V1, which is also the default but has its own documentation.


Minimum perl version 5.24.

Report bugs through GitHub (patches welcome) at


Flavio Poletti <>


Copyright 2021, 2022 by Flavio Poletti <>

Licensed 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

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.