refs #2024 Add help command for cli interface

package.json

@@ -182,6 +182,7 @@
     "i18next": "^19.8.4",
     "lodash": "^4.17.20",
     "megalodon": "3.3.2",
+    "minimist": "^1.2.5",
     "moment": "^2.29.1",
     "mousetrap": "^1.6.5",
     "nedb": "^1.8.0",

src/main/index.ts

@@ -28,6 +28,7 @@ import openAboutWindow from 'about-window'
 import { Entity, detector } from 'megalodon'
 import sanitizeHtml from 'sanitize-html'
 import AutoLaunch from 'auto-launch'
+import minimist from 'minimist'
 
 import pkg from '~/package.json'
 import Authentication from './auth'
@@ -365,6 +366,21 @@ async function createWindow() {
   }
 }
 
+// Parse command line arguments and show help command.
+const args = minimist(process.argv.slice(process.env.NODE_ENV === 'development' ? 2 : 1))
+if (args.help) {
+  console.log(`
+Whalebird is Mastodon, Pleroma and Misskey client for desktop.
+
+Usage
+ $ whalebird
+
+Options
+ --help    show help
+`)
+  process.exit(0)
+}
+
 // Do not lower the rendering priority of Chromium when background
 app.commandLine.appendSwitch('disable-renderer-backgrounding')