Quickly scan for CLI flags and arguments. 

lukeed

	return Array.isArray(any) ? any : any == null ? [] : [any];

	return any == null || any === true ? '' : String(any);

	return any === 'false' ? false : Boolean(any);

	return (!isBool(any) && Number(any)) || any;

	return !isBool(any) && (x * 0 === 0) ? x : any;

	let k, i = 0, len = arr.length, vals = [];

function typecast(key, val, strings, booleans) {

	if (strings.indexOf(key) !== -1) return toString(val);

	if (booleans.indexOf(key) !== -1) return toBool(val);

			len = aliases[k].length; // save length

				x = aliases[k][i]; // alias's key name

				aliases[x] = [k]; // set initial array

			opts[type] = (opts[type] || []).concat(k);

	opts.string = getAlibi(aliases, opts.string);

	opts.boolean = getAlibi(aliases, opts.boolean);

			out._ = out._.concat(args.slice(idx + 1));

			const isGroup = segs[0].charCodeAt(1) !== 45; // '-'

			const flag = segs[0].substr(isGroup ? 1 : 2);

			const key = isGroup ? flag[len - 1] : flag;

			if (opts.unknown !== void 0 && aliases[key] === void 0) {

				FLAG.test(tmp) ? (tmp = true) : (incr = 2);

					out[k] = typecast(k, true, opts.string, opts.boolean);

			const value = typecast(key, tmp, opts.string, opts.boolean);

			out[key] = out[key] !== void 0 ? toArr(out[key]).concat(value) : value;

  "description": "Quickly scan for CLI flags and arguments",

    "precommit": "prettier --single-quote --use-tabs --print-width=100 --write '{lib,test}/*.js'",

# mri [![Build Status](https://travis-ci.org/lukeed/mri.svg?branch=master)](https://travis-ci.org/lukeed/mri)

> Quickly scan for CLI flags and arguments

This is a [fast](#benchmarks) and lightweight alternative to [`minimist`](https://github.com/substack/minimist) and [`yargs-parser`](https://github.com/yargs/yargs-parser).

It only exists because I find that I usually don't need most of what `minimist` and `yargs-parser` have to offer. However, `mri` is similar _enough_ that it might function as a "drop-in replacement" for you, too!

See [Comparisons](#comparisons) for more info.

$ demo-cli --foo --bar=baz -mtv -- hello world

//=> { _: ['hello', 'world'], foo:true, bar:'baz', m:true, t:true, v:true }

//=> { _: ['baz', 'hello', 'world'], foo:true, bar:true, m:true, t:true, v:true }

//=> { _: ['hello', 'world'], foo:true, f:true, fuz:true, b:'baz', bar:'baz', m:true, t:true, v:true }

An array of arguments to parse. For CLI usage, send `process.argv.slice(2)`. See [`process.argv`](https://nodejs.org/docs/latest/api/process.html#process_process_argv) for info.

An object of keys whose values are a `string` or `array` of aliases. These will be added to the parsed output with matching values.

A single key (or array of keys) that should be parsed as `Boolean`s.

An `key:value` object of defaults. If a default is provided for a key, its type (`typeof`) will be used to cast parsed arguments.

  default:{ foo:true, baz:'hello', bat:42 }

//=> { _:['bar'], foo:true, baz:'hello', bat:42 }

> **Note:** Because `--foo` has a default of `true`, its output is cast to a boolean. This means that `foo:true`, which makes `'bar'` an extra argument (`_` key).

A single key (or array of keys) that should be parsed as `String`s.

Callback that is run when a parsed flag has not been defined as a known key or alias. Its only parameter is the unknown flag itself; eg `--foobar` or `-f`.

Once an unknown flag is encountered, parsing will terminate, regardless of your return value.

> **Note:** `mri` _only_ checks for unknown flags if `options.unknown` **and** `options.alias` are populated. Otherwise, everything will be accepted.

- `mri` is 2.5x faster (see [benchmarks](#benchmarks))

- Numerical values are cast as `Number`s when possible

  - A key (and its aliases) will always honor `opts.boolean` or `opts.string`

- Short flag groups are treated as `Boolean`s by default:

    //=> { _:[], a:true, b:true, c:'hello' }

  --> 329,310 ops/sec ±0.27% (88 runs sampled)

  --> 16,100 ops/sec ±0.57% (91 runs sampled)

  --> 129,670 ops/sec ±0.72% (93 runs sampled)

		@@ -24,3 +24,4 @@ 'use strict';
		function toNum(any) {
		return (!isBool(any) && Number(any)) \|\| any;
		let x = Number(any);
		return !isBool(any) && (x * 0 === 0) ? x : any;
		}
		@@ -27,0 +28,0 @@

		{
		"name": "mri",
		"version": "1.1.0",
		"version": "1.1.1",
		"description": "Quickly scan for CLI flags and arguments",
		@@ -21,3 +21,2 @@ "license": "MIT",
		"bench": "node bench",
		"precommit": "prettier --single-quote --use-tabs --print-width=100 --write '{lib,test}/*.js'",
		"test": "tape test/*.js \| tap-spec"
		@@ -32,7 +31,6 @@ },
		"optimist",
		"parser"
		"parser",
		"args"
		],
		"devDependencies": {
		"husky": "^0.13.4",
		"prettier": "^1.1.0",
		"tap-spec": "^4.1.1",
		@@ -39,0 +37,0 @@ "tape": "^4.6.3"

		@@ -11,12 +11,12 @@ # mri [![Build Status](https://travis-ci.org/lukeed/mri.svg?branch=master)](https://travis-ci.org/lukeed/mri)

		## Usage

		## Install
		Firstly, install the package:

		```
		$ npm install --save mri
		npm install --save mri
		```

		Then start using it:

		## Usage

		```sh
		@@ -153,3 +153,2 @@ $ demo-cli --foo --bar=baz -mtv -- hello world


		## Benchmarks
		@@ -166,5 +165,4 @@


		## License

		MIT © [Luke Edwards](https://lukeed.com)

Improved metrics

Worsened metrics