Open auth URL automatically in browser on login (#256)

* Open auth URL automatically in browser on login

* Pin older version of open for CJS support

* Vendor openUrl

* Remove open dep

* Wrap in try/catch

* Promisify

src/openUrl.ts

@@ -0,0 +1,41 @@
+import { spawn } from "child_process";
+
+function getCommandForPlatform(): string {
+  switch (process.platform) {
+    case "darwin":
+      return "open";
+    case "win32":
+      return "explorer.exe";
+    case "linux":
+      return "xdg-open";
+    default:
+      return "open";
+  }
+}
+
+export async function openUrl(url: string): Promise<void> {
+  return new Promise((resolve, reject) => {
+    const command = getCommandForPlatform();
+    const child = spawn(command, [url]);
+    let errorText = "";
+
+    child.stderr.setEncoding("utf8");
+
+    child.stderr.on("data", function (data) {
+      errorText += data;
+    });
+
+    child.stderr.on("end", function () {
+      if (errorText.length > 0) {
+        const error = new Error(errorText);
+        reject(error);
+      } else {
+        resolve();
+      }
+    });
+
+    child.on("error", (error) => {
+      reject(error);
+    });
+  });
+}

src/subcommands/login.ts

@@ -3,6 +3,7 @@ import chalk from "chalk";
 import { boolean, command, flag, option, optional, string } from "cmd-ts";
 import { createClient, createClientArgs } from "../createClient.js";
 import { createLogger, logLevelArgs } from "../logLevel.js";
+import { openUrl } from "../openUrl.js";
 
 export const login = command({
   name: "login",
@@ -69,9 +70,20 @@ export const login = command({
     }
     let askedToAuthenticate = false;
     await client.repository.ensureAuthenticated({
-      onAuthenticationUrl: url => {
+      onAuthenticationUrl: async url => {
         askedToAuthenticate = true;
+
+        try {
+          await openUrl(url);
+          logger.infoText`
+            Opening browser for authentication...
+            If a browser window does not open automatically, visit the following URL directly:
+          `
+          ;
+        } catch {
           logger.info("Please visit the following URL to authenticate:");
+        }
+
         logger.info();
         logger.info(chalk.greenBright(`    ${url}`));
         logger.info();