Add friendlier app CLI

app/src/main.ts

@@ -1,18 +1,53 @@
 "use strict";
 
+import meta from "../package.json";
+
+import dedent from "dedent";
 import minimist from "minimist";
 
+import * as daemon from "./daemon";
+
 
 const argv = minimist(process.argv.slice(2), {
-    boolean: [ "daemon" ]
+    boolean: [ "daemon", "help", "version" ]
+  , string: [ "port" ]
+  , alias: {
+        d: "daemon"
+      , h: "help"
+      , v: "version"
+      , p: "port"
+    }
   , default: {
         daemon: false
+      , port: "9556"
     }
 });
 
 
-if (argv.daemon) {
-    import("./daemon");
+if (argv.version) {
+    console.log(meta.__applicationVersion);
+} else if (argv.help) {
+    console.log(dedent`
+        Usage: ${meta.__applicationExecutableName} [options]
+
+        Options:
+          -h, --help       Print usage info
+          -v, --version    Print version info
+          -d, --daemon     Launch in daemon mode. This starts a WebSocket server that
+                           the extension can be configured to connect to under bridge
+                           options.
+          -p, --port       Set port number for WebSocket server. This must match the
+                           port set in the extension options.
+
+    `);
+} else if (argv.daemon) {
+    const port = parseInt(argv.port);
+    if (!port || port < 1025 || port > 65535) {
+        console.error("Invalid port specified!");
+        process.exit(1);
+    }
+
+    daemon.init(port);
 } else {
     import("./bridge");
 }