Refactor messageHandler and catch unknown commands

app-cli/captainduckduck.js

@@ -1,5 +1,6 @@
 #!/usr/bin/env node
 
+const { printErrorAndExit } = require("./utils/messageHandler")
 const packagejson = require("./package.json")
 const updateNotifier = require("update-notifier")
 const program = require("commander")
@@ -48,4 +49,13 @@ program
     list()
   })
 
+// Error on unknown commands
+program.on("command:*", () => {
+  const wrongCommands = program.args.join(" ")
+
+  printErrorAndExit(
+    `\nInvalid command: ${wrongCommands}\nSee --help for a list of available commands.\n`
+  )
+})
+
 program.parse(process.argv)

app-cli/utils/errorHandler.js

@@ -1,9 +0,0 @@
-const chalk = require("chalk")
-
-function printErrorAndExit(error) {
-  console.log(`${chalk.bold.red(error)}\n\n`)
-
-  process.exit(0)
-}
-
-module.exports = printErrorAndExit

app-cli/utils/messageHandler.js

@@ -0,0 +1,26 @@
+const chalk = require("chalk")
+
+function printMessage(message) {
+  console.log(message)
+}
+
+function printGreenMessage(message) {
+  console.log(`${chalk.green(message)}`)
+}
+
+function printError(error) {
+  console.log(`${chalk.bold.red(error)}`)
+}
+
+function printErrorAndExit(error) {
+  console.log(`${printError(error)}`)
+
+  process.exit(0)
+}
+
+module.exports = {
+  printMessage,
+  printErrorAndExit,
+  printError,
+  printGreenMessage
+}