NAME

Venus::Cli - Cli Class

ABSTRACT

Cli Class for Perl 5

SYNOPSIS

package main;

use Venus::Cli;

my $cli = Venus::Cli->new(['--help']);

$cli->set('opt', 'help', {
  help => 'Show help information',
});

# $cli->opt('help');

# [1]

# $cli->data;

# {help => 1}

DESCRIPTION

This package provides a superclass and methods for creating simple yet robust command-line interfaces.

ATTRIBUTES

This package has the following attributes:

data

data(ArrayRef $data) (ArrayRef)

The data attribute holds an arrayref of command-line arguments and defaults to @ARGV.

Since 2.55

data example 1

# given: synopsis

package main;

my $data = $cli->data([]);

# []

INHERITS

This package inherits behaviors from:

Venus::Kind::Utility

INTEGRATES

This package integrates behaviors from:

Venus::Role::Stashable

METHODS

This package provides the following methods:

arg

arg(Str $name) (Any)

The arg method returns the value passed to the CLI that corresponds to the registered argument using the name provided.

Since 2.55

arg example 1

package main;

use Venus::Cli;

my $cli = Venus::Cli->new(['example', '--help']);

my $name = $cli->arg('name');

# undef

arg example 2

package main;

use Venus::Cli;

my $cli = Venus::Cli->new(['example', '--help']);

$cli->set('arg', 'name', {
  range => '0',
});

my $name = $cli->arg('name');

# ["example"]

arg example 3

package main;

use Venus::Cli;

my $cli = Venus::Cli->new(['example', '--help']);

$cli->set('arg', 'name', {
  range => '0',
});

my ($name) = $cli->arg('name');

# "example"

arg example 4

package main;

use Venus::Cli;

my $cli = Venus::Cli->new(['--help']);

$cli->set('arg', 'name', {
  prompt => 'Enter a name',
  range => '0',
});

my ($name) = $cli->arg('name');

# prompts for name, e.g.

# > name: Enter a name
# > example

# "example"

arg example 5

package main;

use Venus::Cli;

my $cli = Venus::Cli->new(['--help']);

$cli->set('arg', 'name', {
  default => 'example',
  range => '0',
});

my ($name) = $cli->arg('name');

# "example"

arg example 6

package main;

use Venus::Cli;

my $cli = Venus::Cli->new(['example', '--help']);

$cli->set('arg', 'name', {
  type => 'string',
  range => '0',
});

my ($name) = $cli->arg('name');

# "example"

arg example 7

package main;

use Venus::Cli;

my $cli = Venus::Cli->new(['--help']);

$cli->set('arg', 'name', {
  type => 'string',
  range => '0',
});

my ($name) = $cli->arg('name');

# Exception! (isa Venus::Cli::Error) (see error_on_arg_validation)

# Invalid argument: name: received (undef), expected (string)

cmd

cmd(Str $name) (Any)

The cmd method returns truthy or falsy if the value passed to the CLI that corresponds to the argument registered and associated with the registered command using the name provided.

Since 2.55

cmd example 1

package main;

use Venus::Cli;

my $cli = Venus::Cli->new(['example', 'execute']);

my $name = $cli->cmd('name');

# undef

cmd example 2

package main;

use Venus::Cli;

my $cli = Venus::Cli->new(['example', 'execute']);

$cli->set('arg', 'action', {
  range => '1',
});

$cli->set('cmd', 'execute', {
  arg => 'action',
});

my $is_execute = $cli->cmd('execute');

# 1

cmd example 3

package main;

use Venus::Cli;

my $cli = Venus::Cli->new(['example', 'execute']);

$cli->set('arg', 'action', {
  range => '1',
});

$cli->set('cmd', 'execute', {
  arg => 'action',
});

my ($is_execute) = $cli->cmd('execute');

# 1

cmd example 4

package main;

use Venus::Cli;

my $cli = Venus::Cli->new(['example']);

$cli->set('arg', 'action', {
  prompt => 'Enter the desired action',
  range => '1',
});

$cli->set('cmd', 'execute', {
  arg => 'action',
});

my ($is_execute) = $cli->cmd('execute');

# prompts for action, e.g.

# > name: Enter the desired action
# > execute

# 1

cmd example 5

package main;

use Venus::Cli;

my $cli = Venus::Cli->new(['example']);

$cli->set('arg', 'action', {
  default => 'execute',
  range => '1',
});

$cli->set('cmd', 'execute', {
  arg => 'action',
});

my ($is_execute) = $cli->cmd('execute');

# 1

cmd example 6

package main;

use Venus::Cli;

my $cli = Venus::Cli->new(['example', 'execute']);

$cli->set('arg', 'action', {
  type => 'string',
  range => '1',
});

$cli->set('cmd', 'execute', {
  arg => 'action',
});

my ($is_execute) = $cli->cmd('execute');

# 1

cmd example 7

package main;

use Venus::Cli;

my $cli = Venus::Cli->new(['example']);

$cli->set('arg', 'action', {
  type => 'string',
  range => '1',
});

$cli->set('cmd', 'execute', {
  arg => 'action',
});

my ($is_execute) = $cli->cmd('execute');

# 0

exit

exit(Int $code, Str|CodeRef $code, Any @args) (Any)

The exit method exits the program using the exit code provided. The exit code defaults to 0. Optionally, you can dispatch before exiting by providing a method name or coderef, and arguments.

Since 2.55

exit example 1

# given: synopsis

package main;

my $exit = $cli->exit;

# ()

exit example 2

# given: synopsis

package main;

my $exit = $cli->exit(0);

# ()

exit example 3

# given: synopsis

package main;

my $exit = $cli->exit(1);

# ()

exit example 4

# given: synopsis

package main;

my $exit = $cli->exit(1, 'stash', 'executed', 1);

# ()

fail

fail(Str|CodeRef $code, Any @args) (Any)

The fail method exits the program with the exit code 1. Optionally, you can dispatch before exiting by providing a method name or coderef, and arguments.

Since 2.55

fail example 1

# given: synopsis

package main;

my $fail = $cli->fail;

# ()

fail example 2

# given: synopsis

package main;

my $fail = $cli->fail('stash', 'executed', 1);

# ()

get

get(Str $type, Str $name) (Any)

The get method returns arg, opt, cmd, or str configuration values from the configuration database.

Since 2.55

get example 1

package main;

use Venus::Cli;

my $cli = Venus::Cli->new;

my $get = $cli->get;

# undef

get example 2

package main;

use Venus::Cli;

my $cli = Venus::Cli->new;

my $get = $cli->get('opt', 'help');

# undef

get example 3

package main;

use Venus::Cli;

my $cli = Venus::Cli->new;

$cli->set('opt', 'help', {
  alias => 'h',
});

my $get = $cli->get('opt', 'help');

# {name => 'help', alias => 'h'}

get example 4

package main;

use Venus::Cli;

my $cli = Venus::Cli->new;

$cli->set('opt', 'help', {
  alias => 'h',
});

my $get = $cli->get('opt');

# {help => {name => 'help', alias => 'h'}}

help

help() (Str)

The help method returns a string representing "usage" information based on the configuration of the CLI.

Since 2.55

help example 1

package main;

use Venus::Cli;

my $cli = Venus::Cli->new;

my $help = $cli->help;

# "Usage: application"

help example 2

package main;

use Venus::Cli;

my $cli = Venus::Cli->new;

$cli->set('str', 'name', 'program');

my $help = $cli->help;

# "Usage: program"

help example 3

package main;

use Venus::Cli;

my $cli = Venus::Cli->new;

$cli->set('str', 'name', 'program');

$cli->set('arg', 'command', {
  help => 'Command to execute',
});

my $help = $cli->help;

# "Usage: program [<argument>]
#
# Arguments:
#
#   command
#     Command to execute
#     (optional)"

help example 4

package main;

use Venus::Cli;

my $cli = Venus::Cli->new;

$cli->set('str', 'name', 'program');

$cli->set('arg', 'command', {
  help => 'Command to execute',
  required => 1
});

my $help = $cli->help;

# "Usage: program <argument>
#
# Arguments:
#
#   command
#     Command to execute
#     (required)"

help example 5

package main;

use Venus::Cli;

my $cli = Venus::Cli->new;

$cli->set('str', 'name', 'program');

$cli->set('arg', 'command', {
  help => 'Command to execute',
  type => 'string',
  required => 1,
});

my $help = $cli->help;

# "Usage: program <argument>
#
# Arguments:
#
#   command
#     Command to execute
#     (required)
#     (string)"

help example 6

package main;

use Venus::Cli;

my $cli = Venus::Cli->new;

$cli->set('str', 'name', 'program');

$cli->set('arg', 'command', {
  help => 'Command to execute',
  required => 1,
});

$cli->set('cmd', 'create', {
  help => 'Create new resource',
  arg => 'command',
});

my $help = $cli->help;

# "Usage: program <argument>
#
# Arguments:
#
#   command
#     Command to execute
#     (required)
#
# Commands:
#
#   create
#     Create new resource
#     (ccommand)"

help example 7

package main;

use Venus::Cli;

my $cli = Venus::Cli->new;

$cli->set('str', 'name', 'program');

$cli->set('arg', 'command', {
  help => 'Command to execute',
  required => 1,
});

$cli->set('opt', 'help', {
  help => 'Show help information',
  alias => ['?', 'h'],
});

$cli->set('cmd', 'create', {
  help => 'Create new resource',
  arg => 'command',
});

my $help = $cli->help;

# "Usage: program <argument> [<option>]
#
# Arguments:
#
#   command
#     Command to execute
#     (required)
#
# Options:
#
#   -?, -h, --help
#     Show help information
#     (optional)
#
# Commands:
#
#   create
#     Create new resource
#     (command)"

help example 8

package main;

use Venus::Cli;

my $cli = Venus::Cli->new;

$cli->set('str', 'name', 'program');

$cli->set('arg', 'files', {
  help => 'File paths',
  required => 1,
  range => '0:',
});

$cli->set('opt', 'verbose', {
  help => 'Show details during processing',
  alias => ['v'],
});

my $help = $cli->help;

# "Usage: program <argument>, ... [<option>]
#
# Arguments:
#
#   files, ...
#     File paths
#     (required)
#
# Options:
#
#   -v, --verbose
#     Show details during processing
#     (optional)"

okay

okay(Str|CodeRef $code, Any @args) (Any)

The okay method exits the program with the exit code 0. Optionally, you can dispatch before exiting by providing a method name or coderef, and arguments.

Since 2.55

okay example 1

# given: synopsis

package main;

my $okay = $cli->okay;

# ()

okay example 2

# given: synopsis

package main;

my $okay = $cli->okay('stash', 'executed', 1);

# ()

opt

opt(Str $name) (Any)

The opt method returns the value passed to the CLI that corresponds to the registered option using the name provided.

Since 2.55

opt example 1

package main;

use Venus::Cli;

my $cli = Venus::Cli->new(['example', '--help']);

my $name = $cli->opt('help');

# undef

opt example 2

package main;

use Venus::Cli;

my $cli = Venus::Cli->new(['example', '--help']);

$cli->set('opt', 'help', {});

my $name = $cli->opt('help');

# [1]

opt example 3

package main;

use Venus::Cli;

my $cli = Venus::Cli->new(['example', '--help']);

$cli->set('opt', 'help', {});

my ($name) = $cli->opt('help');

# 1

opt example 4

package main;

use Venus::Cli;

my $cli = Venus::Cli->new([]);

$cli->set('opt', 'name', {
  prompt => 'Enter a name',
  type => 'string',
  multi => 0,
});

my ($name) = $cli->opt('name');

# prompts for name, e.g.

# > name: Enter a name
# > example

# "example"

opt example 5

package main;

use Venus::Cli;

my $cli = Venus::Cli->new(['--name', 'example']);

$cli->set('opt', 'name', {
  prompt => 'Enter a name',
  type => 'string',
  multi => 0,
});

my ($name) = $cli->opt('name');

# Does not prompt

# "example"

opt example 6

package main;

use Venus::Cli;

my $cli = Venus::Cli->new(['example', '--name', 'example', '--name', 'example']);

$cli->set('opt', 'name', {
  type => 'string',
  multi => 1,
});

my (@name) = $cli->opt('name');

# ("example", "example")

opt example 7

package main;

use Venus::Cli;

my $cli = Venus::Cli->new(['example', '--name', 'example']);

$cli->set('opt', 'name', {
  type => 'number',
  multi => 1,
});

my ($name) = $cli->opt('name');

# Exception! (isa Venus::Cli::Error) (see error_on_opt_validation)

# Invalid option: name: received (undef), expected (number)

parsed

parsed() (HashRef)

The parsed method returns the values provided to the CLI for all registered arguments and options as a hashref.

Since 2.55

parsed example 1

package main;

use Venus::Cli;

my $cli = Venus::Cli->new(['example', '--help']);

$cli->set('arg', 'name', {
  range => '0',
});

$cli->set('opt', 'help', {
  alias => 'h',
});

my $parsed = $cli->parsed;

# {name => "example", help => 1}

parser

parser() (Opts)

The parser method returns a Venus::Opts object using the "spec" returned based on the CLI configuration.

Since 2.55

parser example 1

package main;

use Venus::Cli;

my $cli = Venus::Cli->new;

$cli->set('opt', 'help', {
  help => 'Show help information',
  alias => 'h',
});

my $parser = $cli->parser;

# bless({...}, 'Venus::Opts')

set

set(Str $type, Str $name, Str|HashRef $data) (Any)

The set method stores configuration values for arg, opt, cmd, or str data in the configuration database, and returns the invocant.

The following are configurable arg properties:

The default property specifies the "default" value to be used if none is provided.
The help property specifies the help text to output in usage instructions.
The label property specifies the label text to output in usage instructions.
The name property specifies the name of the argument.
The prompt property specifies the text to be used in a prompt for input if no value is provided.
The range property specifies the zero-indexed position where the CLI arguments can be found, using range notation.
The required property specifies whether the argument is required and throws an exception is missing when fetched.
The type property specifies the data type of the argument. Valid types are number parsed as a Getopt::Long integer, string parsed as a Getopt::Long string, float parsed as a Getopt::Long float, boolean parsed as a Getopt::Long flag, or yesno parsed as a Getopt::Long string. Otherwise, the type will default to boolean.

The following are configurable cmd properties:

The arg property specifies the CLI argument where the command can be found.
The help property specifies the help text to output in usage instructions.
The label property specifies the label text to output in usage instructions.
The name property specifies the name of the command.

The following are configurable opt properties:

The alias property specifies the alternate identifiers that can be provided.
The default property specifies the "default" value to be used if none is provided.
The help property specifies the help text to output in usage instructions.
The label property specifies the label text to output in usage instructions.
The multi property denotes whether the CLI will accept multiple occurrences of the option.
The name property specifies the name of the option.
The prompt property specifies the text to be used in a prompt for input if no value is provided.
The required property specifies whether the option is required and throws an exception is missing when fetched.
The type property specifies the data type of the option. Valid types are number parsed as a Getopt::Long integer, string parsed as a Getopt::Long string, float parsed as a Getopt::Long float, boolean parsed as a Getopt::Long flag, or yesno parsed as a Getopt::Long string. Otherwise, the type will default to boolean.

Since 2.55

set example 1

package main;

use Venus::Cli;

my $cli = Venus::Cli->new;

my $set = $cli->set;

# undef

set example 2

package main;

use Venus::Cli;

my $cli = Venus::Cli->new;

my $set = $cli->set('opt', 'help');

# bless({...}, 'Venus::Cli')

set example 3

package main;

use Venus::Cli;

my $cli = Venus::Cli->new;

my $set = $cli->set('opt', 'help', {
  alias => 'h',
});

# bless({...}, 'Venus::Cli')

set example 4

package main;

use Venus::Cli;

my $cli = Venus::Cli->new;

my $set = $cli->set('opt', 'help', {
  alias => ['?', 'h'],
});

# bless({...}, 'Venus::Cli')

str

str(Str $name) (Any)

The str method gets or sets configuration strings used in CLI help text based on the arguments provided. The "help" method uses "name", "description", "header", and "footer" strings.

Since 2.55

str example 1

package main;

use Venus::Cli;

my $cli = Venus::Cli->new;

$cli->set('str', 'name', 'program');

my $str = $cli->str('name');

# "program"

ERRORS

This package may raise the following errors:

error: error_on_arg_validation

This package may raise an error_on_arg_validation exception.

example 1

# given: synopsis;

my @args = ("...", "example", "string");

my $error = $cli->throw('error_on_arg_validation', @args)->catch('error');

# my $name = $error->name;

# "on_arg_validation"

# my $message = $error->message;

# "Invalid argument: example: ..."

# my $name = $error->stash('name');

# "example"

# my $type = $error->stash('type');

# "string"

error: error_on_opt_validation

This package may raise an error_on_opt_validation exception.

example 1

# given: synopsis;

my @args = ("...", "example", "string");

my $error = $cli->throw('error_on_opt_validation', @args)->catch('error');

# my $name = $error->name;

# "on_opt_validation"

# my $message = $error->message;

# "Invalid option: example: ..."

# my $name = $error->stash('name');

# "example"

# my $type = $error->stash('type');

# "string"

AUTHORS

Awncorp, awncorp@cpan.org

LICENSE

This program is free software, you can redistribute it and/or modify it under the terms of the Apache license version 2.0.

To install Venus, copy and paste the appropriate command in to your terminal.

cpanm

cpanm Venus

CPAN shell

perl -MCPAN -e shell
install Venus

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

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NAME

ABSTRACT

SYNOPSIS

DESCRIPTION

ATTRIBUTES

data

INHERITS

INTEGRATES

METHODS

arg

cmd

exit

fail

get

help

okay

opt

parsed

parser

set

str

ERRORS

AUTHORS

LICENSE

Module Install Instructions