fix(list): include errors in standard output

Author: imhoffd

src/android/list.ts

@@ -1,33 +1,36 @@
-import { serializeError } from '../errors';
+import { Exception } from '../errors';
 import { Targets, formatTargets } from '../utils/list';
 
 import { getDeviceTargets, getVirtualTargets } from './utils/list';
 import { getSDK } from './utils/sdk';
 
 export async function run(args: readonly string[]): Promise<void> {
-  process.stdout.write(`\n${formatTargets(args, await list(args))}\n`);
+  const targets = await list(args);
+  process.stdout.write(`\n${formatTargets(args, targets)}\n`);
 }
 
 export async function list(args: readonly string[]): Promise<Targets> {
   const sdk = await getSDK();
+
+  const errors: Exception<string>[] = [];
   const [ devices, virtualDevices ] = await Promise.all([
     (async () => {
       try {
         return await getDeviceTargets(sdk);
       } catch (e) {
-        process.stderr.write(`Error with Android device targets: ${serializeError(e)}`);
+        errors.push(e);
         return [];
       }
     })(),
     (async () => {
       try {
         return await getVirtualTargets(sdk);
       } catch (e) {
-        process.stderr.write(`Error with Android virtual targets: ${serializeError(e)}`);
+        errors.push(e);
         return [];
       }
     })(),
   ]);
 
-  return { devices, virtualDevices };
+  return { devices, virtualDevices, errors };
 }

src/errors.ts

@@ -1,7 +1,11 @@
 import { stringify } from './utils/json';
 
+export const enum ExitCode {
+  GENERAL = 1,
+}
+
 export class Exception<T extends string, D = object> extends Error implements NodeJS.ErrnoException {
-  constructor(readonly message: string, readonly code?: T, readonly exitCode = 1, readonly data?: D) {
+  constructor(readonly message: string, readonly code?: T, readonly exitCode = ExitCode.GENERAL, readonly data?: D) {
     super(message);
   }
 

src/index.ts

@@ -1,7 +1,7 @@
 import * as Debug from 'debug';
 import * as path from 'path';
 
-import { CLIException, ERR_BAD_INPUT, Exception, serializeError } from './errors';
+import { CLIException, ERR_BAD_INPUT, Exception, ExitCode, serializeError } from './errors';
 
 const debug = Debug('native-run');
 
@@ -41,7 +41,7 @@ export async function run(): Promise<void> {
     }
   } catch (e) {
     debug('Caught fatal error: %O', e);
-    process.exitCode = e instanceof Exception ? e.exitCode : 1;
+    process.exitCode = e instanceof Exception ? e.exitCode : ExitCode.GENERAL;
     process.stdout.write(serializeError(e));
   }
 }

src/ios/list.ts

@@ -1,23 +1,25 @@
 import { DeviceValues } from 'node-ioslib';
 
-import { serializeError } from '../errors';
+import { Exception } from '../errors';
 import { Target, Targets, formatTargets } from '../utils/list';
 
 import { getConnectedDevices } from './utils/device';
 import { Simulator, getSimulators } from './utils/simulator';
 
 export async function run(args: readonly string[]): Promise<void> {
-  process.stdout.write(`\n${formatTargets(args, await list(args))}\n`);
+  const targets = await list(args);
+  process.stdout.write(`\n${formatTargets(args, targets)}\n`);
 }
 
 export async function list(args: readonly string[]): Promise<Targets> {
+  const errors: Exception<string>[] = [];
   const [ devices, virtualDevices ] = await Promise.all([
     (async () => {
       try {
         const devices = await getConnectedDevices();
         return devices.map(deviceToTarget);
       } catch (e) {
-        process.stderr.write(`Error with iOS device targets: ${serializeError(e)}`);
+        errors.push(e);
         return [];
       }
     })(),
@@ -26,13 +28,13 @@ export async function list(args: readonly string[]): Promise<Targets> {
         const simulators = await getSimulators();
         return simulators.map(simulatorToTarget);
       } catch (e) {
-        process.stderr.write(`Error with iOS virtual targets: ${serializeError(e)}`);
+        errors.push(e);
         return [];
       }
     })(),
   ]);
 
-  return { devices, virtualDevices };
+  return { devices, virtualDevices, errors };
 }
 
 function deviceToTarget(device: DeviceValues): Target {

src/list.ts

@@ -1,49 +1,31 @@
-import { serializeError } from './errors';
 import { stringify } from './utils/json';
 import { Targets, formatTargets } from './utils/list';
 
 export async function run(args: readonly string[]): Promise<void> {
-  let iosError: Error | undefined;
-  let androidError: Error | undefined;
-
-  const [ios, android] = await Promise.all([
-    (async (): Promise<Targets | undefined> => {
+  const [ ios, android ] = await Promise.all([
+    (async (): Promise<Targets> => {
       const cmd = await import('./ios/list');
-
-      try {
-        return await cmd.list(args);
-      } catch (e) {
-        iosError = e;
-      }
+      return cmd.list(args);
     })(),
-    (async (): Promise<Targets | undefined> => {
+    (async (): Promise<Targets> => {
       const cmd = await import('./android/list');
-
-      try {
-        return await cmd.list(args);
-      } catch (e) {
-        androidError = e;
-      }
+      return cmd.list(args);
     })(),
   ]);
 
-  if (iosError || androidError) {
-    process.exitCode = 1;
-  }
-
   if (args.includes('--json')) {
-    process.stdout.write(stringify({ ios, iosError, android, androidError }));
+    process.stdout.write(stringify({ ios, android }));
   } else {
     process.stdout.write(`
-iOS ${iosError ? '(!)' : ''}
+iOS
 ---
 
-${ios ? formatTargets(args, ios) : serializeError(iosError)}
+${formatTargets(args, ios)}
 
-Android ${androidError ? '(!)' : ''}
+Android
 -------
 
-${android ? formatTargets(args, android) : serializeError(androidError)}
+${formatTargets(args, android)}
 
     `);
   }

src/utils/list.ts

@@ -1,10 +1,11 @@
-import { CLIException, ERR_BAD_INPUT } from '../errors';
+import { CLIException, ERR_BAD_INPUT, Exception, serializeError } from '../errors';
 
 import { stringify } from './json';
 
 export interface Targets {
   readonly devices: readonly Target[];
   readonly virtualDevices: readonly Target[];
+  readonly errors: readonly Exception<string>[];
 }
 
 export interface Target {
@@ -17,7 +18,7 @@ export interface Target {
 }
 
 export function formatTargets(args: readonly string[], targets: Targets): string {
-  const { devices, virtualDevices } = targets;
+  const { devices, virtualDevices, errors } = targets;
 
   const virtualOnly = args.includes('--virtual');
   const devicesOnly = args.includes('--device');
@@ -29,16 +30,21 @@ export function formatTargets(args: readonly string[], targets: Targets): string
   if (args.includes('--json')) {
     let result;
     if (virtualOnly) {
-      result = { virtualDevices };
+      result = { virtualDevices, errors };
     } else if (devicesOnly) {
-      result = { devices };
+      result = { devices, errors };
     } else {
-      result = { devices, virtualDevices };
+      result = { devices, virtualDevices, errors };
     }
     return stringify(result);
   }
 
   let output = '';
+
+  if (errors.length > 0) {
+    output += `Errors (!):\n\n${errors.map(e => `  ${serializeError(e)}`)}\n`;
+  }
+
   if (!virtualOnly) {
     output += printTargets('Connected Device', devices);
     if (devicesOnly) {