Get licenses from package.json

gistfile1.js

/*
 * Note: The code in this gist is in no way meant to be pretty, please do not judge my coding abilities
 * based on it
 */

var package = require( './package.json' ),
	_ = require( 'underscore' ),
	q = require( 'q' ),
	exec = require( 'child_process' ).exec;

var license_text = {
	'MIT': '[MIT License](http://opensource.org/licenses/MIT)',
	'Apache 2.0': '[Apache License](https://www.apache.org/licenses/LICENSE-2.0)',
	'Apache-2.0': '[Apache License](https://www.apache.org/licenses/LICENSE-2.0)',
	'BSD': '[BSD](http://en.wikipedia.org/wiki/BSD_licenses)'
}

var runCommand = function( command ) {
	return q
		.Promise( function( resolve, reject ) {
			exec( command, function( error, stdout, stderr ) {
				resolve( stdout );
			} );
		} );
};

q
	.async( function *() {
		var list = yield runCommand( 'npm ls' )
		var lines = list.split( '\n' );
		var licenses = _
			.chain( lines )
			.map( ( line ) => {
				return ( line.match( /^.{4}([\w-]+)/g ) );
			} )
			.filter( ( match ) => {
				return match !== null;
			} )
			.map( ( match ) => match[ 0 ] )
			.filter( ( line ) => line.charAt( 0 ) === '├' )
			.map( ( line ) => line.substring( 4 ) )
			.map( ( name ) => [ name, require( './node_modules/' + name + '/package.json' ) ] )
			.map( ( dep_package_array ) => {
				var dep_package = dep_package_array[ 1 ];
				var license;
				if( dep_package.hasOwnProperty( 'license' ) ){
					license = dep_package.license;
				}

				if( dep_package.hasOwnProperty( 'licenses' ) ) {
					license = dep_package.licenses;
				}

				dep_package_array.push( license );
				return dep_package_array;
			} )
			.filter( ( arr ) => arr[ 2 ] !== null && arr[ 2 ] !== undefined )
			.map( ( arr ) => {
				while( arr[ 2 ] instanceof Array ) {
					arr[ 2 ] = arr[ 2 ][ 0 ];
				}
				return arr;
			} )
			.map( ( arr ) => {
				if( arr[ 2 ].hasOwnProperty( 'type' ) ) {
					arr[ 2 ] = arr[ 2 ].type;
				}
				return arr;
			} )
			.map( ( arr ) => {
				if( license_text.hasOwnProperty( arr[ 2 ] ) ) {
					arr[ 2 ] = license_text[ arr[ 2 ] ];
				}
				return arr;
			} )
			.map( ( arr ) => {
				var author;
				if( arr[ 1 ].hasOwnProperty( 'author' ) ) {
					author = ( arr[ 1 ].author );
				}

				if( arr[ 1 ].hasOwnProperty( 'authors' ) ) {
					author = ( arr[ 1 ].authors );
				}

				arr.push( author );
				return arr;
			} )
			.map( ( arr ) => {
				if( arr[ 3 ] instanceof Object ) {
					arr[ 3 ] = _.map( arr[ 3 ], ( val ) => val ).join( ' ' );
				}
				return arr;
			} )
			.map( ( arr ) => {
				return '### [' + arr[ 1 ].name + '](' + arr[ 1 ].homepage + ')\n' +
					   arr[ 1 ].description + '\n' +
					   '\n' +
					   '>' + arr[ 2 ];
			} )
			.value();

		console.log( licenses.join( '\n\n' ) );
	} )()
		.then( process.exit )
		.catch( ( error ) => {
			console.error( error );
			console.error( error.stack );
		} );