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Command-Line Applications Made Simple

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README.mkdn

NAME

Command::Do - Command-Line Applications Made Simple

VERSION

version 0.120011

SYNOPSIS

A simple script with option and argument parsing.

use Command::Do;

# default command (execute runs on-load)
execute command sub {
    my ($self, $opts, $args) = @_;
    printf "You sunk my %s\n", $opts->{vessel} || 'Battleship';
};

# example usage
$ ./yourcmd

A simple script with option/argument parsing and input validation.

use Command::Do -less;

field vessel => {
    required => 1,
    filters  => ['trim','strip','titlecase'],
    default  => 'Battleship'
};

# default command (execute runs on-load)
execute command sub {
    my ($self, $opts, $args) = @_;
    printf "You sunk my %s\n", $self->vessel;
};

# example usage
$ ./yourcmd --vessel Yacht

A simple script with option/argument parsing, input validation, and sub-commands.

use Command::Do -less;

field vessel => {
    required => 1,
    filters  => ['trim','strip','titlecase'],
    default  => 'Battleship'
};

command move => sub {
    my ($self, $opts, $args) = @_;
    printf "Relocating your %s\n", $self->vessel;
};

command engage => sub {
    my ($self, $opts, $args) = @_;
    printf "Your %s has engaged enemy aircrafts\n", $self->vessel;
};

# default command (execute runs on-load)
execute command sub {
    my ($self, $opts, $args) = @_;
    printf "You sunk my %s\n", $self->vessel;
};

# example usage
$ ./yourcmd engage
$ ./yourcmd move --vessel 'Cruise Ship'
$ ./yourcmd --vessel=Battleship

A simple script with option/argument parsing, validation, sub-commands and documentation. Let your documentation determine which options and arguments your program expects.

package YourCmd;

use Command::Do -less;

field name => {
    required  => 1,
    filters   => ['trim', 'strip', 'titlecase'],
    min_alpha => 4,
};

field x => {
    filters => ['trim', 'strip', 'numeric'],
    default => 0
};

field y => {
    filters => ['trim', 'strip', 'numeric'],
    default => 0
};

command new => sub {
    my ($self, $opts, $args) = @_;
    $self->validate('name')
        or $self->render_errors;

    # create new ship
};

command evade => sub {
    my ($self, $opts, $args) = @_;
    $self->validate('name', 'y', 'x')
        or $self->render_errors;

    # move ship to different coordinates
    # e.g. using $opts->{speed} which defaults to 10
};

command submerge => sub {
    my ($self, $opts, $args) = @_;
    $self->validate('name', 'x', 'y')
        or $self->render_errors;

    # cause ship to be under water
};

# roll your own output rendering
sub render_errors {
    my ($self) = @_;
    print STDERR $self->errors_to_string, "\n";
    exit(1);
}

1;

# The DATA section will be render to STDOUT automatically unless the default
# command or a sub-command matched the execution

__DATA__

Battleship Script.

Usage:
    yourcmd new <name>
    yourcmd evade <name> <x> <y> [--speed=<kn>]
    yourcmd submerge <name> <x> <y>

Options:
    --speed=<kn>  Speed in knots [default: 10].

As depicted, you can opt in or out of most all features. Please see Validation::Class for more information on creating field definitions for validation, and see Docopt for more information on the usage-text format and parser specification.

DESCRIPTION

Command::Do is a simple toolkit for building simple or sophisticated command-line applications with ease. It includes very little magic, executes quickly, and is useful when creating, validating, executing, and organizing command-line applications and actions. Command::Do inherits most of its functionality from Validation::Class which allows you to focus on describing your command-line arguments and how they should be validated. Command::Do also uses Docopt and Smart::Options for parsing additional command-line options and arguments. Command::Do is very unassuming as thus flexible. It does not impose a particular application configuration and its dependencies are trivial and easily fat-packed. Command::Do simply provides you with the tools to create simple or sophisticated command-line interfaces, all wrapped-up in a nice DSL.

The name Command::Do is meant to convey the idea, command-and-do, i.e., write a command and do something! Leave the parsing, routing, validating, exception handling and execution to the framework. Command::Do inherits the following methods from Validation::Class, (command, execute, usages, build, directive, document, field, filter, message, method, mixin, profile and prototype) and implements the following new ones.

METHODS

command

The command function/method is used to register a coderef by name which may be automatically invoked by the execute method if it's name matches the first argument to the execute method. The command method can be passed a coderef, or a name and coderef. The coderef, when executed will be passed an instance of the current class, a hashref of command-line options, and an arrayref of extra command-line arguments. If passed a coderef without an associated name, that routine will be registered as the default routine to be executed by default if/when no other named routines match.

# sub-command to be execute when <name> matches the first argument
command name => sub {
    my ($self, $options, $arguments) = @_;
    ...
};

# default command to be execute unless a sub-command matches the request
# the default command is passed an additional argument, the usages-text
# which can be print to the console
command name => sub {
    my ($self, $options, $arguments, $usages_text) = @_;
    ...
};

execute

The execute function/method is used to process the command-line request by parsing the options and arguments and finding a matching pattern, action and/or routine and executing it. The execute method can take a list of arguments but defaults to using @ARGV. This method can also be used as a function to initiate the parsing and execution process from within a script.

# instantiate and execute from anywhere, using execute as a function
# will cause the code to execute whenever/wherever loaded
my $self = YourCmd->new;
$self->execute;

usages

The usages function/method is used to register the Docopt compatible command-line interface specification. This specification will be parsed for instructions, e.g. default-values, constraints, execution patterns, options and more.

usages q{
yourcmd. does stuff.

Usage:
    run         causes the console to run
    jump        causes the console to jump
    play        causes the console to play

Options:
    -h --hours  [default: 8]
};

If the usages text is not registered using this function, Command::Do will examine the DATA section for instructions.

__DATA__
yourcmd. does stuff.

Usage:
    run         causes the console to run
    jump        causes the console to jump
    play        causes the console to play

Options:
    -h --hours  [default: 8]

AUTHOR

Al Newkirk anewkirk@ana.io

COPYRIGHT AND LICENSE

This software is copyright (c) 2013 by Al Newkirk.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.

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