Tools: Added build tools detection script (#2661)

* finished writing first script version

* added preinstall script

* removed white space and platform if statements

* remove error log

* removed install function

* corrected commands

* changed ls to list

build_tools_check.js

@@ -0,0 +1,27 @@
+const util = require('util');
+const exec = util.promisify(require('child_process').exec);
+
+const verifyBuildToolInstallation = async (tool, checkCommand, installCommand) => {
+	try {
+		const { stdout } = await exec(checkCommand);
+		console.log(`${tool} is Installed: ${stdout}`);
+	} catch (error) {
+		console.warn(`WARNING: This development tool is not installed: "${tool}". Please install it using your package manager. For example: ${installCommand}`);
+	}
+};
+
+switch (process.platform) {
+case 'win32':
+	verifyBuildToolInstallation('Windows Build Tools', 'npm list -g windows-build-tools', 'npm install --global windows-build-tools');
+	break;
+case 'darwin':
+	verifyBuildToolInstallation('CocoaPods', 'pod --version', 'sudo gem install cocoapods');
+	verifyBuildToolInstallation('rsync', 'rsync --version', 'sudo port install rsync');
+	break;
+case 'linux':
+	verifyBuildToolInstallation('rsync', 'rsync --version', 'sudo apt-get install rsync');
+	break;
+default:
+	console.log('WARNING: Please ensure that you read the documentation to know the necessary build tools that must be installed in your system to successfullly build this project');
+}
+

package.json

@@ -3,6 +3,7 @@
   "version": "1.0.0",
   "description": "Joplin root package for linting",
   "scripts": {
+    "preinstall": "node build_tools_check.js",
     "linter": "./node_modules/.bin/eslint --fix --ext .js --ext .jsx --ext .ts --ext .tsx",
     "linter-ci": "./node_modules/.bin/eslint --ext .js --ext .jsx --ext .ts --ext .tsx",
     "watch": "gulp watch",