dencli/bin/example.rb

#!/usr/bin/env ruby

require 'pathname'
$:.unshift Pathname.new(__FILE__).dirname.dirname.join('lib').to_s
require 'dencli'

cli = DenCli.new :example, "This is an example for generate a DenCli-API"
cli.cmd( :args, "Expects and prints given arguments",
	&lambda {|a, b, c:, d:, e:, f:, g:|
		p a: a, b: b, c: c, d: d, e: e
	}).
	opt( :c, '-c=ForC', "Option c").
	opt( :d, '-dForD', "Option d", default: "something").
	opt( :e, '-e', "Toggle e", default: false).
	opt( :f, '--[no-]f', "Toggle f", default: false).
	opt( :g, '--long-option=sth', "Long option, no short option", default: "nothing").
	opt( :h, '-hsth', "No long option, only short option", default: "nothing")

cli.cmd( :example, "I have an example command") { STDERR.puts "This is an example" }
cli.cmd( :help, "An example for help", aliases: [nil, '-h', '--help'], &lambda {|*commands, full:|
	if full
		cli.help_full *commands, output: STDERR
	else
		cli.help *commands, output: STDERR
	end
}).
	opt( :full, '-f', '--[no-]full', "Print all commands and sub-commands.", default: false)

cli.sub( :more, "Sub-Commands are also possible with a new cli") do |sub|
	sub.cmd( :help, "", aliases: [nil, '-h', '--help']) {|*args| STDERR.puts sub.help(*args) }
	sub.cmd( :help, "") {|*args| STDERR.puts cli.help( 'more', *args) }
	sub.cmd( :example, "Here is an example, too") { STDERR.puts "This is an other example" }
	sub.cmd( :foo, "BAR") { STDERR.puts "FOO bar"}

	sub.cmd( :args, "Expects and prints given arguments", &lambda {|a, b=1, c:, d: 5, e:|
			p a: a, b: b, c: c, d: d, e: e
		}).
		opt( :c, '-c=ForC', "Option c").
		opt( :d, '-d=ForD', "Option d (implicit default)").
		opt( :e, '-e', "Toggle e")

	sub.sub( :deeper, "You want to have Sub-Sub-Commands?") do |sub2|
		sub2.cmd( :help, "", aliases: [nil, '-h', '--help'], &lambda {|*commands| sub2.help( *commands, output: STDERR) })
		sub2.cmd( :last, "The last example", &lambda { STDERR.puts "The last example" })

		sub2.sub( :'sub-commands', "Endless Sub-Sub- ...") do |sub3|
			sub3.cmd( :help, "") {|*args| STDERR.puts sub3.help( sub3, *args) }
			sub3.cmd( :hehe, "The real last example", min: 2) { STDERR.puts "Trust me!" }
		end
	end
end

begin
	cli.call *ARGV
rescue DenCli::UsageError
	STDERR.puts $!
	exit 1
end