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node-cmdln
is a node.js helper lib for creating CLI tools with subcommands
(think git
, svn
, zfs
, brew
, etc.). It is a sister of my earlier
Python lib for this.
Follow @trentmick for updates to node-cmdln.
You define a subclass of Cmdln
and subcommands as do_NAME
methods.
Minimally you could have a "conan.js" as follows:
#!/usr/bin/env node
var util = require('util');
var Cmdln = require('cmdln').Cmdln;
function Conan() {
Cmdln.call(this, {
name: 'conan',
desc: 'What is best in life?'
});
}
util.inherits(Conan, Cmdln);
Conan.prototype.do_crush = function do_crush(subcmd, opts, args, callback) {
console.log('Yargh!');
callback();
};
Conan.prototype.do_crush.help = 'Crush your enemies.';
// mainline
var cli = new Conan();
cli.main(process.argv, function (err) {
if (err) {
console.error('conan: error: %s', err);
process.exit(1);
}
process.exit(0);
});
With this, you get the following behaviour:
$ node conan.js
What is best in life?
Usage:
conan [OPTIONS] COMMAND [ARGS...]
conan help COMMAND
Options:
-h, --help Show this help message and exit.
Commands:
help (?) Help on a specific sub-command.
crush Crush your enemies.
$ node conan.js help crush
Crush your enemies.
$ node conan.js crush
Yargh!
See "examples/conan.js" for a larger example, including option processing
and help templating. node example/conan.js ...
to try it out.
Option processing (using dashdash)
is integrated. do_crush
above could be replaced with:
Conan.prototype.do_crush = function (subcmd, opts, args, callback) {
console.log('Yargh!');
callback();
};
Conan.prototype.do_crush = function (subcmd, opts, args, callback) {
if (opts.help) {
this.do_help('help', {}, [subcmd], callback);
return;
}
if (!args.length) {
console.log('No enemies? Yarg!');
} else {
args.forEach(function (enemy) {
console.log('Smite %s with a %s!', enemy, opts.weapon);
});
}
callback();
};
Conan.prototype.do_crush.options = [
{
names: ['help', 'h'],
type: 'bool',
help: 'Show this help.'
},
{
names: ['weapon', 'w'],
helpArg: 'WEAPON',
type: 'string',
default: 'sword',
help: 'Weapon with which to smite.'
}
];
Conan.prototype.do_crush.help = (
'Crush your enemies.\n'
+ '\n'
+ 'Usage:\n'
+ ' conan crush [OPTIONS] [ENEMIES...]\n'
+ '\n'
+ '{{options}}'
);
Then we get this behaviour:
$ node conan.js crush Bob
Smite Bob with a sword!
$ node conan.js crush Bob Linda --weapon mattock
Smite Bob with a mattock!
Smite Linda with a mattock!
$ node conan.js crush -h
Crush your enemies.
Usage:
conan crush [OPTIONS] [ENEMIES...]
Options:
-h, --help Show this help.
-w WEAPON, --weapon=WEAPON Weapon with which to smite.
MIT. See LICENSE.txt
1.0.1
do_help
on itself.FAQs
helper lib for creating CLI tools with subcommands; think `git`, `svn`, `zfs`
The npm package cmdln receives a total of 1,158 weekly downloads. As such, cmdln popularity was classified as popular.
We found that cmdln demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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