feat: introduce cli update command (#25)

Author: patrickmichalina

README.md

@@ -41,6 +41,12 @@ fng help
 
 ### Updating Fusing Angular CLI
 
+```bash
+fng update
+```
+
+or
+
 ```bash
 npm i -g fusing-angular-cli@latest
 ```

src/commands/index.ts

@@ -3,6 +3,7 @@ import './build'
 import './serve'
 import './favicon'
 import './config'
+import './update'
 import { argv } from 'yargs'
 
 argv

src/commands/update.ts

@@ -0,0 +1,23 @@
+import { command } from 'yargs'
+import { logInfo, logError } from '../utilities/log'
+import { load, commands } from 'npm'
+
+command(
+  'update',
+  'update the CLI to the latest version',
+  args => {
+    return args
+  },
+  args => {
+    update()
+  }
+)
+
+function update() {
+  logInfo('Updating the CLI')
+  load({ global: true }, () => {
+    commands.install(['fusing-angular-cli@latest'], err => {
+      err && logError(err)
+    })
+  })
+}