refactor of the module

Author: wswebcreation

.gitignore

@@ -1,3 +1,4 @@
 node_modules/
 *.log
 .idea/
+build/

README.md

@@ -16,19 +16,3 @@ Advice is to install is globally with `npm install -g start-android-emulator`.
 
 ## Usage
 After installing it globally it can be used with the following command `start-android-emulator`.
-
-## FAQ
-### No emulators are found
-If no emulators are found open Android Studio and add one. See Google how to do this
-
-### I'm getting an error that my `ANDROID_HOME` has not been set correct
-When trying to start my emulator I get this log
-
-```bash
-===========================================================
-  /Users/wswebcreation/Library/Android/sdk/tools/emulator
-  does not exist. Did you set your 'ANDROID_HOME' correct?
-===========================================================
-```
-
-Just check the `ANDROID_HOME` variable and check if it has been set to the correct folder where the emulators would be found.

babel.config.js

@@ -0,0 +1,9 @@
+module.exports = {
+    presets: [
+        [ '@babel/preset-env', {
+            targets: {
+                node: 8
+            }
+        } ]
+    ],
+};

bin/start-android-emulator.js

@@ -10,7 +10,6 @@ const parentPath = resolve(cwd, '..');
 const dir = __dirname;
 const folder = cwd.replace(parentPath, '').substring(1);
 
-const isProjectVersion = folder === nodeModuleName;
 let isLocalVersion = false;
 
 let printCyan, printMagenta, printGreen;

index.js

@@ -0,0 +1,127 @@
+import { spawnSync, execFileSync } from 'child_process';
+import { existsSync } from 'fs';
+import { cyan, red } from 'chalk';
+import { prompt } from 'inquirer';
+
+const MESSAGE_TYPES = {
+	ERROR: 'error',
+	NOTIFY: 'notify',
+};
+
+(async () => {
+	const emulators = getEmulators();
+	const questions = [
+		{
+			type: 'list',
+			name: 'emulator',
+			message: 'Which emulator do you want to start?',
+			choices: emulators,
+		},
+		{
+			type: 'list',
+			name: 'wipeData',
+			message: 'Do you want to wipe data (delete all user data and copy data from the initial data file)?',
+			choices: [ 'No', 'Yes' ],
+		},
+	];
+
+	logMessage(
+		MESSAGE_TYPES.NOTIFY,
+		'Android Emulator CLI Helper',
+	)
+
+	if (emulators.length > 0) {
+		const answers = await prompt(questions);
+		startEmulator(answers);
+	} else {
+		logMessage(
+			MESSAGE_TYPES.ERROR,
+			'NO ANDROID EMULATORS SPECIFIED',
+		);
+	}
+})();
+
+/**
+ * Start the emulator based on all the answers
+ *
+ * @param answers {object} All the answers
+ * @param answers.emulator {string} The emulator name
+ * @param answers.wipeData {string} If the emulator needs to be cleaned yes or no
+ */
+function startEmulator(answers) {
+	try {
+		// Start logging that we start
+		logMessage(
+			MESSAGE_TYPES.NOTIFY,
+			`${ answers.emulator } is being started. You can close the device with 'X'-button on the toolbar of the device.`,
+		);
+
+		// Start the emulator
+		const runOnEmulator = spawnSync(
+			'emulator',
+			[
+				'-avd',
+				answers.emulator,
+				answers.wipeData === 'Yes' ? '-wipe-data' : '-no-snapshot',
+			],
+		);
+		console.log(runOnEmulator.stdout.toString());
+
+		// Check if there is an error and throw it
+		const stderr = runOnEmulator.stderr.toString();
+		if (stderr) {
+			new Error(stderr);
+		}
+		process.exit(0);
+	} catch (e) {
+		let errorMessage;
+
+		if (e.message.includes('Cannot read property \'toString\' of null')) {
+			errorMessage = 'It looks like the `emulator` has not been set correct in your environment variables. ' +
+				'Please check this article on how to fix it.' +
+				'\n\n  https://bit.ly/2XD94gV';
+		} else if (!existsSync(process.env.ANDROID_HOME)) {
+			errorMessage = 'The environment variable `ANDROID_HOME` is not found. Did you set your `ANDROID_HOME` correct?'
+		} else {
+			errorMessage = `The error\n\n${ e }\n\n  occurred and the emulator couldn't be started.   !Check Google what the problem could be!`;
+		}
+
+		// Now log the error message
+		logMessage(
+			MESSAGE_TYPES.ERROR,
+			errorMessage,
+		);
+	}
+}
+
+/**
+ * GEt all the emulators that are installed
+ *
+ * @return {string[]}
+ */
+function getEmulators() {
+	return execFileSync(
+		'emulator',
+		[ '-list-avds' ],
+		{ encoding: 'utf8' },
+	)
+		.replace(/\n$/, '')
+		.split('\n');
+}
+
+/**
+ * Print the error message
+ *
+ * @param {string} type
+ * @param {string} message
+ */
+function logMessage(type, message) {
+	const messageType = type === MESSAGE_TYPES.NOTIFY ? cyan : red;
+	console.log(messageType(`
+============================================================================================================================================
+  
+  ${ message }
+  
+============================================================================================================================================
+`));
+}