Open OAuth login URLs during setup

src/model/commands.ts

@@ -3,6 +3,7 @@ import { writeFileSync } from "node:fs";
 
 import { readJson } from "../pi/settings.js";
 import { promptChoice, promptText } from "../setup/prompts.js";
+import { openUrl } from "../system/open-url.js";
 import { printInfo, printSection, printSuccess, printWarning } from "../ui/terminal.js";
 import {
 	buildModelStatusSnapshotFromRecords,
@@ -126,7 +127,13 @@ export async function loginModelProvider(authPath: string, providerId?: string,
 	await authStorage.login(provider.id, {
 		onAuth: (info: { url: string; instructions?: string }) => {
 			printSection(`Login: ${provider.name ?? provider.id}`);
-			printInfo(`Open this URL: ${info.url}`);
+			const opened = openUrl(info.url);
+			if (opened) {
+				printInfo("Opened the login URL in your browser.");
+			} else {
+				printWarning("Couldn't open your browser automatically.");
+			}
+			printInfo(`Auth URL: ${info.url}`);
 			if (info.instructions) {
 				printInfo(info.instructions);
 			}

src/system/open-url.ts

@@ -0,0 +1,51 @@
+import { spawn } from "node:child_process";
+
+import { resolveExecutable } from "./executables.js";
+
+type ResolveExecutableFn = (name: string, fallbackPaths?: string[]) => string | undefined;
+
+type OpenUrlCommand = {
+	command: string;
+	args: string[];
+};
+
+export function getOpenUrlCommand(
+	url: string,
+	platform = process.platform,
+	resolveCommand: ResolveExecutableFn = resolveExecutable,
+): OpenUrlCommand | undefined {
+	if (platform === "win32") {
+		return {
+			command: "cmd",
+			args: ["/c", "start", "", url],
+		};
+	}
+
+	if (platform === "darwin") {
+		const command = resolveCommand("open");
+		return command ? { command, args: [url] } : undefined;
+	}
+
+	const command = resolveCommand("xdg-open");
+	return command ? { command, args: [url] } : undefined;
+}
+
+export function openUrl(url: string): boolean {
+	const command = getOpenUrlCommand(url);
+	if (!command) {
+		return false;
+	}
+
+	try {
+		const child = spawn(command.command, command.args, {
+			detached: true,
+			stdio: "ignore",
+			windowsHide: true,
+		});
+		child.on("error", () => {});
+		child.unref();
+		return true;
+	} catch {
+		return false;
+	}
+}