NAME

Data::Object::Cli - Simple CLIs

ABSTRACT

Command-line Interface Abstraction for Perl 5

SYNOPSIS

package Command;

use parent 'Data::Object::Cli';

sub main {
  my ($self) = @_;

  return $self->help;
}

my $command = run Command;

DESCRIPTION

This package provides an abstract base class for defining command-line interface classes, which can be run as scripts or passed as objects in a more complex system.

LIBRARIES

This package uses type constraints from:

Data::Object::Types

ATTRIBUTES

This package has the following attributes:

args

args(ArgsObject)

This attribute is read-only, accepts (ArgsObject) values, and is optional.

data

data(DataObject)

This attribute is read-only, accepts (DataObject) values, and is optional.

opts

opts(OptsObject)

This attribute is read-only, accepts (OptsObject) values, and is optional.

vars

vars(VarsObject)

This attribute is read-only, accepts (VarsObject) values, and is optional.

METHODS

This package implements the following methods:

exit

exit(Int $code, Maybe[Str] $name, Any %args) : Any

The exit method exits the program using the exit code provided. The exit code defaults to 0. Optionally, you can call a handler before exiting by providing a method name with arguments. The handler will be called using the handle method so the arguments should be key/value pairs.

exit example #1

# given: synopsis

$command->exit(0);

# $command->exit($code, $method_name, %args);
# $command->exit($code, $method_name);
# $command->exit($code);

exit example #2

# given: synopsis

$command->exit(1);

# $command->exit($code, $method_name, %args);
# $command->exit($code, $method_name);
# $command->exit($code);

fail

fail(Maybe[Str] $name, Any %args) : Any

The fail method exits the program with a 1 exit code. Optionally, you can call a handler before exiting by providing a method name with arguments. The handler will be called using the handle method so the arguments should be key/value pairs.

fail example #1

# given: synopsis

$command->fail;

# $command->fail($method_name, %args);
# $command->fail($method_name);

handle

handle(Str $name, Any %args) : Any

The handle method dispatches to the method whose name is provided as the first argument. The forwarded method will receive arguments as key/value pairs. This method injects the args, data, vars, and opts attributes as arguments for convenience of use in the forwarded method. Any additional arguments should be passed as key/value pairs.

handle example #1

# given: synopsis

$command->handle('main');

# $command->handle($method_name, %args);
# $command->handle($method_name);

help

help() : Str

The help method returns the help text documented in POD if available.

help example #1

package Todolist;

use parent 'Data::Object::Cli';

my $todolist = run Todolist;

# $todolist->help

help example #2

package Todolist;

use parent 'Data::Object::Cli';

our $name = 'todolist';

my $todolist = run Todolist;

# $todolist->help

help example #3

package Todolist;

use parent 'Data::Object::Cli';

sub name {
  'todolist'
}

my $todolist = run Todolist;

# $todolist->help

help example #4

package Todolist;

use parent 'Data::Object::Cli';

our $name = 'todolist';
our $info = 'manage your todo list';

my $todolist = run Todolist;

# $todolist->help

help example #5

package Todolist;

use parent 'Data::Object::Cli';

sub name {
  'todolist'
}

sub info {
  'manage your todo list'
}

my $todolist = run Todolist;

# $todolist->help

help example #6

package Todolist::Command::Show;

use parent 'Data::Object::Cli';

sub name {
  'todolist show [<{priority}>]'
}

sub info {
  'show your todo list tasks by priority levels'
}

my $command = run Todolist::Command::Show;

# $command->help

main

main(Any %args) : Any

The main method is the "main method" and entrypoint into the program. It's called automatically by the run method if your package is configured as recommended. This method accepts arguments as key/value pairs, and if called by run will receive the args, data, opts, and vars objects.

main example #1

package Todolist;

use parent 'Data::Object::Cli';

sub main {
  my ($self, %args) = @_;

  return {%args} # no args
}

my $todolist = run Todolist;

$todolist->main;

main example #2

package Todolist;

use parent 'Data::Object::Cli';

sub main {
  my ($self, %args) = @_;

  # has $args{args}
  # has $args{data}
  # has $args{opts}
  # has $args{vars}

  return {%args}
}

# $args{args} = $self->args; # isa <Data::Object::Args>
# represents @ARGV

# $args{data} = $self->data; # isa <Data::Object::Data>
# represents __DATA__

# $args{opts} = $self->opts; # isa <Data::Object::Opts>
# represents Getopt::Long

# $args{vars} = $self->vars; # isa <Data::Object::Vars>
# represents %ENV

my $todolist = run Todolist;

$todolist->handle('main'); # called automatically by run

okay

okay(Maybe[Str] $name, Any %args) : Any

The okay method exits the program with a 0 exit code. Optionally, you can call a handler before exiting by providing a method name with arguments. The handler will be called using the handle method so the arguments should be key/value pairs.

okay example #1

# given: synopsis

$command->okay;

# $command->okay($method_name, %args);
# $command->okay($method_name);

run

run() : Object

The run method is designed to bootstrap the program. It detects whether the package is being invoked as a script or class and behaves accordingly. It will be called automatically when the package is looaded if your package is configured as recommended. This method will, if invoked as a script, call the main method passing the args, data, opts, and vars objects.

run example #1

package Todolist;

use parent 'Data::Object::Cli';

run Todolist;

spec

spec() : HashRef[HashRef]

The spec method returns a hashref of flag definitions used to configure Getopt::Long. These options are accessible as methods on the Data::Object::Opts object through the opts attribute. Each flag definition can optionally declare args, flag, and type values as follows. The args property denotes that multiple flags are permitted and its value can be any valid Getopt::Long repeat specifier. The type property denotes the type of data allowed and defaults to type string. Allowed values are string, number, or float. The flag property denotes the flag aliases and should be a pipe-delimited string, e.g. userid|id|u, if multiple aliases are used.

spec example #1

package Todolist::Task;

use parent 'Data::Object::Cli';

our $name = 'todotask {id}';

# id accessible as $self->args->id; alias of $ARGV[0]

sub spec {
  {
    #
    # represented in Getopt::Long as
    # title|t=s
    #
    # title is accessible as $self->opts->title
    #
    title => {
      type => 'string',
      flag => 't'
    },
    #
    # represented in Getopt::Long as
    # content=s
    #
    # content is accessible as $self->opts->content
    #
    content => {
      type => 'string',
    },
    #
    # represented in Getopt::Long as
    # attach|a=s@
    #
    # attach is accessible as $self->opts->attach
    #
    attach => {
      flag => 'a',
      args => '@' # allow multiple options
    }
  }
}

my $todotask = run Todolist::Task;

# $todotask->spec

AUTHOR

Al Newkirk, awncorp@cpan.org

LICENSE

This is free software; you can redistribute it and/or modify it under the terms of the The Apache License, Version 2.0, as elucidated in the "license file".

PROJECT

To install Data::Object::Cli, copy and paste the appropriate command in to your terminal.

cpanm

cpanm Data::Object::Cli

CPAN shell

perl -MCPAN -e shell
install Data::Object::Cli

For more information on module installation, please visit the detailed CPAN module installation guide.

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