initial commit

node_modules/concat/index.ts

@@ -0,0 +1,58 @@
+import {readFile, readdir, writeFile, statSync} from 'fs'
+import {resolve, join} from 'path'
+
+const log = (err: Error) => console.log(err);
+
+const isFile = (f: string) => statSync(f).isFile();
+
+const write = (fName: string, str: string) => new Promise((res, rej) => {
+  writeFile(resolve(fName), str, (err: Error) => {
+    if (err) return rej(err)
+    
+    return res(str)
+  })
+});
+
+const readFolder = (folder: string) => new Promise((res, rej) => {
+  readdir(resolve(folder), (err, files) => {
+    if (err) rej(err)
+    
+		const fileList = files.map(f => join(folder, f));
+    res(fileList.filter(isFile));
+  })
+});
+
+
+const read = (fName: string) => new Promise((res, rej) => {
+  readFile(resolve(fName), (err, str) => {
+    if (err) rej(err)
+    
+    res(str)
+  })
+});
+
+const concat = (files: string[]) => new Promise((res, rej) => {
+	return Promise.all(files.map(read))
+		.then(src => res(src.join('\n')))
+		.catch(rej);
+});
+
+export = (folder: string[] | string, outFile?: string) => new Promise((res, rej) => {
+	let concatenated;
+
+	if(typeof folder === 'string') { 
+		concatenated = readFolder(folder)
+			.then(concat);
+	} else {
+		concatenated = concat(folder);
+	}
+
+	if (outFile) {
+		concatenated.then((out: string) => write(outFile, out)
+			.then(res)
+			.catch(rej)
+		).catch(rej);
+	} else {
+		concatenated.then(res).catch(rej);
+	}
+});