feat(#111): parse args & print version

src/app.ts

@@ -41,23 +41,39 @@ export const { clientsAt, messageClientsAt } = setupSockets(
 
 const address = `http://localhost:${config.port}`;
 const handleArgs = async () => {
-    await Promise.all(
-        process.argv.slice(2).map(async (path) => {
-            if (path.startsWith('-')) return;
-            if (!existsSync(path)) {
-                console.log(`File not found: ${path}`);
-                return;
+    try {
+        const args = process.argv.slice(2);
+        const options = args.filter((arg) => arg.startsWith('-'));
+        for (const option of options) {
+            switch (option) {
+                case '-v':
+                case '--version':
+                    console.log(`vivify-server ${process.env.VERSION ?? 'dev'}`);
+                    break;
+                default:
+                    console.log(`unknown option "${option}"`);
             }
-            const target = preferredPath(presolve(path));
-            const url = `${address}${pathToURL(target)}`;
-            await open(url);
-        }),
-    );
-    if (process.env['NODE_ENV'] !== 'development') {
-        // - viv executable waits for this string and then stops printing
-        //   vivify-server's output and terminates
-        // - the string itself is not shown to the user
-        console.log('STARTUP COMPLETE');
+        }
+
+        const paths = args.filter((arg) => !arg.startsWith('-'));
+        await Promise.all(
+            paths.map(async (path) => {
+                if (!existsSync(path)) {
+                    console.log(`File not found: ${path}`);
+                    return;
+                }
+                const target = preferredPath(presolve(path));
+                const url = `${address}${pathToURL(target)}`;
+                await open(url);
+            }),
+        );
+    } finally {
+        if (process.env['NODE_ENV'] !== 'development') {
+            // - viv executable waits for this string and then stops printing
+            //   vivify-server's output and terminates
+            // - the string itself is not shown to the user
+            console.log('STARTUP COMPLETE');
+        }
     }
 };