gia-cli/lib/create/index.js

Guardian US Interactive CLI tool

/*global require, module, console, process */

var chalk = require( 'chalk' );
var path = require( 'path' );
var semver = require( 'semver' );
var sander = require( 'sander' );
var Promise = sander.Promise;
var prompt = require( 'prompt' );
var getPath = require( './getPath' );
var copyDir = require( './copyDir' );
var checkVersion = require( '../utils/checkVersion' );

var cwd = process.cwd();
var templates = path.join( __dirname, '../../templates' );

module.exports = function ( options ) {
	var name, dest;

	if ( options.help ) {
		options.args.unshift( 'create' );
		require( './help' )( options );
		return;
	}

	var name = path.basename( cwd ).replace( /^[\d\-]+/, '' );

	checkVersion( options.flags.force ).then( function () {
		ensureEmptyDir( cwd )
			.then( function () {
				// copy project template, processing files as necessary
				return stamp( options.flags.template || options.args[0], name, cwd );
			})
			.then( function () {
				console.log( '\n...and we\'re done. Run ' + chalk.cyan( 'npm i' ) + ' to install dependencies, and ' + chalk.cyan( 'npm start' ) + ' to serve and preview your project' );
			})
			.catch( function ( err ) {
				console.log( '\nOh noes! Something went wrong' );
				console.error( err );
			});
	}).catch( function ( err ) {
		console.error( err.message );
		process.exit( 1 );
	});
};

function ensureEmptyDir ( dir ) {
	return sander.readdir( dir ).then( function ( files ) {
		if ( files.length ) {
			console.log( '\nTarget folder is not empty! To create a project in a new folder, use ' + chalk.cyan( 'gia create folder-name' ) + ', otherwise type the word ' + chalk.cyan( 'nuke' ) + ' to continue (or hit Enter to abort).' );

			return new Promise( function ( fulfil, reject ) {
				prompt.start();

				prompt.get([ 'confirmation' ], function ( err, result ) {
					if ( !result || result.confirmation !== 'nuke' ) {
						console.log( 'Aborting...' );
						process.exit();
					}

					console.log( 'Deleting contents of %s...', dir );
					Promise.all(
						files.map( function ( file ) {
							return sander.rimraf( dir, file );
						})
					).then( fulfil, reject );
				});
			});
		}
	}, function () {
		// directory doesn't exist, we just need to add this function
		// so that the error doesn't propagate
	});
}

function stamp ( template, name, dest ) {
	var root, variables, varPattern = /__(.+?)__/g, varReplacer, processor;

	template = template || 'default';
	root = path.join( templates, template, 'root' );

	var rename = {};
	try {
		rename = require( path.join( templates, template, 'rename.json' ) );
	} catch ( err ) {
		// noop
	}

	var renamer = getRenamer( rename );

	console.log( 'Copying %s template to %s...', template, dest );

	variables = {
		NAME: name,
		PATH: getPath( name ),
		PORT: getPort( name )
	};

	varReplacer = function ( match, $1 ) {
		return variables[ $1 ] || match;
	};

	processor = function ( content ) {
		return content.replace( varPattern, varReplacer );
	};

	return copyDir( root, dest, processor, renamer );
}

function getRenamer ( rename ) {
	return function ( file ) {
		var basename = path.basename( file );
		return path.join( path.dirname( file ), rename[ basename ] || basename );
	}
}

function getPort ( name ) {
	var port = 4567, i;

	i = name.length;
	while ( i-- ) {
		port += name.charCodeAt( i );
	}

	return port;
}