[util] Added requireDeep

src/util/requireDeep.js

@@ -0,0 +1,62 @@
+const fs = require(`fs`).promises;
+const {
+	map,
+	pipe,
+	filter,
+	flatten,
+	wrapWith,
+	promiseAll,
+	containsPath,
+} = require('../util');
+
+// const { warn } = console;
+
+// const validate = config => {
+// 	if(!config) throw new Error(`Create a config file to proceed.`);
+// 	if(!config.testData) throw new Error(`"testData" property not found in config.js`);
+// 	if(!config.plans) throw new Error(`"planDir" property not found in config.js`);
+// 	if(!config.pattern) warn(`> "pattern" property not found in config.js.`
+// 		+ ` All json files in the target directory will be loaded.`);
+// };
+
+const isFileOrDir = path => fs.stat(path)
+.then(stat =>
+	stat.isDirectory()
+		? ({ path, type: `dir` })
+		: ({ path, type: `file` })
+);
+
+const _matchOnePattern = (pattern, path) => {
+	const tests = Array.isArray(pattern) ? pattern : [pattern];
+	return tests.some(test => new RegExp(test).test(path));
+};
+
+const _getEachFile = ({ path, exclude, pattern }) => item =>
+	isFileOrDir(path + `/` + item)
+	.then(y => {
+		if(exclude && containsPath(exclude, y.path))
+			return [];
+		/* eslint-disable-next-line */
+		return y.type === `dir`
+			? requireDeep({ plans: y.path, exclude, pattern })
+			: _matchOnePattern(pattern || '.json', y.path)
+			// Wrapping in object to prevent accidental flattening
+				? wrapWith(`module`)(require(y.path))
+				: [];
+	});
+
+const requireDeep = ({ plans: path, exclude, pattern = '.json' }) =>
+	isFileOrDir(path)
+	.then(o => (o.type === `dir`)
+		? pipe(
+			fs.readdir,
+			map(_getEachFile({ path, exclude, pattern })),
+			promiseAll,
+			flatten,
+			filter(Boolean), // Filter out undefined values
+			map(y => y.module || y), // Unwrap objects from their wrappers
+		)(o.path)
+		: Promise.reject(`${path} is not a directory`)
+	);
+
+module.exports = requireDeep;