[code] split helpers into separate files

src/rsyncCli.js

@@ -0,0 +1,42 @@
+const { sync: commandExists } = require('command-exists');
+const { get: nodeCmd } = require('node-cmd');
+
+const validateRsync = (callback = () => {}) => {
+  const rsyncCli = commandExists.sync('rsync');
+
+  if (!rsyncCli) {
+    nodeCmd(
+      'sudo apt-get --no-install-recommends install rsync',
+      (err, data, stderr) => {
+        if (err) {
+          console.log('⚠️ [CLI] Rsync installation failed ', err.message);
+          process.abort();
+        } else {
+          console.log('✅ [CLI] Rsync installed. \n', data, stderr);
+          callback();
+        }
+      }
+    );
+  } else {
+    callback();
+  }
+};
+
+const validateInputs = (inputs) => {
+  const validInputs = inputs.filter((input) => {
+    if (!input) {
+      console.error(`⚠️ ${input} is mandatory`);
+    }
+
+    return input;
+  });
+
+  if (validInputs.length !== inputs.length) {
+    process.abort();
+  }
+};
+
+module.exports = {
+  validateRsync,
+  validateInputs
+}