feat(cli): show warning when ImageOptim.app is not installed

src/constants.ts

@@ -28,6 +28,12 @@ export const PNGQUANT_SPEED = '1';
 export const PNGQUANT_BIN_PATH = '/Applications/ImageAlpha.app/Contents/MacOS/pngquant';
 export const IMAGEOPTIM_BIN_PATH = '/Applications/ImageOptim.app/Contents/MacOS/ImageOptim';
 
+export const HOMEPAGE_URL = 'https://github.com/JamieMason/ImageOptim-CLI';
+export const ASSISTIVE_DEVICES_URL = `${HOMEPAGE_URL}/#jpegmini-and-support-for-assistive-devices`;
+export const IMAGEALPHA_URL = 'https://pngmini.com/';
+export const IMAGEOPTIM_URL = 'https://imageoptim.com/mac';
+export const JPEG_MINI_URL = 'https://itunes.apple.com/us/app/jpegmini/id498944723';
+
 export const IMAGEALPHA: IApp = {
   bundleId: 'net.pornel.ImageAlpha',
   name: 'ImageAlpha',

src/run-imagealpha.ts

@@ -1,14 +1,18 @@
+import { pathExists } from 'fs-extra';
 import { AppRunner, IOptions } from '.';
-import { IMAGEALPHA } from './constants';
+import { IMAGEALPHA, IMAGEALPHA_URL, PNGQUANT_BIN_PATH } from './constants';
 import { isSupported } from './is-supported';
-import { info, verbose } from './log';
+import { info, verbose, warning } from './log';
 import { pngquant } from './pngquant';
 
 export const runImageAlpha: AppRunner = async (options: IOptions) => {
   info(`Running ${IMAGEALPHA.name}...`);
   const pngFilePaths = options.files.supported
     .map((file) => file.tmp)
     .filter(isSupported(IMAGEALPHA.supports));
+  if (!(await pathExists(PNGQUANT_BIN_PATH))) {
+    return warning(`ImageAlpha.app is not installed (${IMAGEALPHA_URL})`);
+  }
   await pngquant(pngFilePaths, options);
   verbose(`${IMAGEALPHA.name} has finished`);
 };

src/run-imageoptim.ts

@@ -1,10 +1,14 @@
 import { stdout } from 'execa';
+import { pathExists } from 'fs-extra';
 import { AppRunner } from '.';
-import { IMAGEOPTIM, IMAGEOPTIM_BIN_PATH } from './constants';
-import { info, verbose } from './log';
+import { IMAGEOPTIM, IMAGEOPTIM_BIN_PATH, IMAGEOPTIM_URL } from './constants';
+import { info, verbose, warning } from './log';
 
 export const runImageOptim: AppRunner = async (options) => {
   info(`Running ${IMAGEOPTIM.name}...`);
+  if (!(await pathExists(IMAGEOPTIM_BIN_PATH))) {
+    return warning(`ImageOptim.app is not installed (${IMAGEOPTIM_URL})`);
+  }
   await stdout(IMAGEOPTIM_BIN_PATH, [options.tmpDir]);
   verbose(`${IMAGEOPTIM.name} has finished`);
 };

src/run-jpegmini.ts

@@ -5,13 +5,10 @@ import {
   runJpegMini as startJpegMini,
   supportsAssistiveDevices
 } from './applescript';
+import { ASSISTIVE_DEVICES_URL, HOMEPAGE_URL, JPEG_MINI_URL } from './constants';
 import { info, verbose, warning } from './log';
 
 export const runJpegMini: AppRunner = async (options) => {
-  const homepageUrl = 'https://github.com/JamieMason/ImageOptim-CLI';
-  const jpegMiniUrl = 'https://itunes.apple.com/us/app/jpegmini/id498944723';
-  const assistiveDevicesUrl = `${homepageUrl}/#jpegmini-and-support-for-assistive-devices`;
-
   verbose('Locating JPEGmini installation');
   const jpegMini = getJpegMini();
 
@@ -21,11 +18,11 @@ export const runJpegMini: AppRunner = async (options) => {
   const [app, canAutomate] = await Promise.all([jpegMini, assistiveDeviceSupport]);
 
   if (!app) {
-    return warning(`JPEGmini is not installed (${jpegMiniUrl})`);
+    return warning(`JPEGmini is not installed (${JPEG_MINI_URL})`);
   }
 
   if (!canAutomate) {
-    return warning(`Support for assistive devices needed, see ${assistiveDevicesUrl}`);
+    return warning(`Support for assistive devices needed, see ${ASSISTIVE_DEVICES_URL}`);
   }
 
   info(`Running ${app.name}...`);