code

.gitignore

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+node_modules/
+package-lock.json
+.idea
+
+lib/
+test/

.npmignore

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+*
+!lib/*

package.json

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+{
+  "name": "clitastic",
+  "version": "0.0.1",
+  "description": "Interactive CLI utility",
+  "main": "./lib/index.js",
+  "types": "./lib/index.d.ts",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/CupCakeArmy/clitastic"
+  },
+  "scripts": {
+    "build": "tsc",
+    "dev": "tsnd --respawn --no-notify test/main.ts",
+    "prepublishOnly": "rm -rf ./lib && npm run build"
+  },
+  "keywords": [
+    "cli",
+    "interface",
+    "interactive"
+  ],
+  "author": "Niccolo Borgioli",
+  "license": "MIT",
+  "devDependencies": {
+    "@types/node": "^12",
+    "ts-node-dev": "^1.0.0-pre",
+    "typescript": "^3.5"
+  },
+  "dependencies": {
+    "colors": "^1.3.3"
+  }
+}

src/index.ts

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+import 'colors'
+import readline from 'readline'
+import Timeout = NodeJS.Timeout
+
+export const sleep = (time: number) => new Promise(resolve => setTimeout(resolve, time * 1000))
+
+type CLIWriterStream = NodeJS.ReadWriteStream
+
+
+export class Writer {
+	private rl: readline.Interface
+	private readonly output: CLIWriterStream
+	private readonly input: CLIWriterStream
+	private lines: number = 1
+
+	constructor(initial?: string, output: CLIWriterStream = process.stdout, input: CLIWriterStream = process.stdin) {
+		this.output = output
+		this.input = input
+		this.rl = this.create()
+
+		if (initial)
+			this.update(initial)
+	}
+
+	replaceAll(data?: string): this {
+		readline.moveCursor(this.output, 0, -(this.lines -1 ))
+		readline.cursorTo(this.output, 0)
+		readline.clearScreenDown(this.output)
+		this.update(data)
+		return this
+	}
+
+	replaceLn(data?: string): this {
+		readline.clearLine(this.output, 0)
+		readline.cursorTo(this.output, 0)
+		this.lines--
+		this.update(data)
+		return this
+	}
+
+	append(data?: string): this {
+		this.update(data)
+		return this
+	}
+
+	appendLn(data?: string): this {
+		this.append('\n' + (data || ''))
+		return this
+	}
+
+	done(data?: string) {
+		if (data)
+			this.replaceLn(data)
+		this.append('\n')
+		this.rl.close()
+		// console.log('lines', this.lines)
+	}
+
+	private create() {
+		return readline.createInterface({
+			input: this.input,
+			output: this.output,
+		})
+	}
+
+	private update(data?: string) {
+		if (!data) return
+		this.lines += data.split(/\r\n|\r|\n/).length - 1
+		this.rl.write(data)
+	}
+}
+
+
+export class Spinner {
+	private readonly chars: string[]
+	private readonly speed: number
+	private readonly writer: Writer
+	private readonly timeout: Timeout
+	private counter: number = 0
+
+	constructor(chars: string | string[] = '◝◞◟◜', speed: number = 100) {
+		this.chars = Array.isArray(chars) ? chars : chars.split('')
+		this.speed = speed
+		this.writer = new Writer(this.getNextChar())
+		this.timeout = setInterval(() => {
+			this.update()
+		}, speed)
+	}
+
+	done() {
+		this.writer.done()
+		clearInterval(this.timeout)
+	}
+
+	private getNextChar(): string {
+		const c = this.chars[this.counter]
+		this.counter = (this.counter + 1) % this.chars.length
+		return c
+	}
+
+	private update() {
+		this.writer.replaceLn(this.getNextChar())
+	}
+}
+
+
+export class List {
+	static readonly DefaultIcon: string = '○'
+	private readonly writer: Writer
+	private icon: string | string[]
+	private items: any[]
+
+	constructor(items: any[], icon: string | string[] = List.DefaultIcon) {
+		this.writer = new Writer()
+		this.items = items
+		this.icon = icon
+
+		this.render()
+	}
+
+	update(items: any[], icon: string | string[] = List.DefaultIcon): this {
+		this.items = items
+		this.icon = icon
+		this.render()
+		return this
+	}
+
+	done() {
+		this.writer.done()
+	}
+
+	private render() {
+		this.writer.replaceAll()
+		let first = true
+		for (let i = 0; i < this.items.length; ++i) {
+			const text = `${Array.isArray(this.icon) ? this.icon[i] : this.icon} ${String(this.items[i])}`
+			if (first) {
+				this.writer.append(text)
+				first = false
+			} else
+				this.writer.appendLn(text)
+		}
+		// this.writer.appendLn()
+	}
+}

tsconfig.json

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+{
+  "compilerOptions": {
+    "target": "esnext",
+    "module": "commonjs",
+    "declaration": true,
+    "outDir": "./lib",
+    "removeComments": true,
+    "strict": true,
+    "noImplicitAny": true,
+    "strictNullChecks": true,
+    "strictFunctionTypes": true,
+    "strictBindCallApply": true,
+    "strictPropertyInitialization": true,
+    "noImplicitThis": true,
+    "alwaysStrict": true,
+    "noImplicitReturns": true,
+    "noFallthroughCasesInSwitch": true,
+    "esModuleInterop": true
+  },
+  "include": [
+    "src/**/*"
+  ],
+  "exclude": [
+    "test"
+  ]
+}