Check all executable extensions on windows

packages/@ionic/utils-subprocess/package.json

@@ -40,6 +40,7 @@
     "@ionic/utils-fs": "1.2.0",
     "@ionic/utils-process": "0.1.0",
     "@ionic/utils-stream": "0.0.1",
+    "@ionic/utils-terminal": "0.0.1",
     "cross-spawn": "^6.0.5",
     "debug": "^4.0.0",
     "tslib": "^1.9.0"

packages/@ionic/utils-subprocess/src/__tests__/index.ts

@@ -72,8 +72,6 @@ describe('@ionic/utils-subprocess', () => {
     const mock_os = { homedir: () => '/home/me' };
     jest.mock('cross-spawn', () => mockCrossSpawn);
     jest.mock('os', () => mock_os);
-    const mock_path_posix = path.posix;
-    jest.mock('path', () => mock_path_posix);
     const { Subprocess, SubprocessError } = require('../');
 
     beforeEach(() => {
@@ -116,9 +114,9 @@ describe('@ionic/utils-subprocess', () => {
     });
 
     it('should alter PATH with tildes if provided', async () => {
-      const PATH = '/path/to/bin:~/bin';
+      const PATH = ['/path/to/bin', '~/bin'].join(path.delimiter);
       const cmd = new Subprocess('cmd', [], { env: { PATH } });
-      expect(cmd.options.env.PATH).toEqual('/path/to/bin:/home/me/bin');
+      expect(cmd.options.env.PATH).toEqual(['/path/to/bin', '/home/me/bin'].join(path.delimiter));
     });
 
     it('should bashify command and args', async () => {
@@ -402,4 +400,47 @@ describe('@ionic/utils-subprocess', () => {
 
   });
 
+  describe('which/findExecutables', () => {
+    describe('windows', () => {
+      const originalPATHEXT = process.env.PATHEXT;
+      const mockBinDir1 = 'C:\\path\\to\\nodejs';
+      const mockBinDir2 = 'C:\\other\\path\\to\\nodejs';
+      const mockBinPath1 = path.win32.join(mockBinDir1, 'node.exe');
+      const mockBinPath2 = path.win32.join(mockBinDir2, 'node.cmd');
+      const mockPATH = `C:\\my\\home\\dir;C:\\some\\other\\dir;${mockBinDir1};${mockBinDir2}`;
+
+      process.env.PATHEXT = '.COM;.EXE;.BAT;.CMD';
+
+      afterAll(() => {
+        process.env.PATHEXT = originalPATHEXT;
+      });
+
+      jest.resetModules();
+      jest.mock('path', () => path.win32);
+      jest.mock('@ionic/utils-terminal', () => ({ TERMINAL_INFO: { windows: true } }));
+      jest.doMock('@ionic/utils-fs', () => ({
+        isExecutableFile: async (filePath: string) => filePath === mockBinPath1 || filePath === mockBinPath2
+      }));
+
+      const { which, findExecutables } = require('../');
+
+      it('should find the first executable in PATH', async () => {
+        const result = await which('node', { PATH: mockPATH });
+        expect(result).toEqual(mockBinPath1);
+      });
+
+      it('should not append an extension if already provided', async () => {
+        const result = await which('node.cmd', { PATH: mockPATH });
+        expect(result).toEqual(mockBinPath2);
+      });
+
+      it('should find all executables in PATH', async () => {
+        const result = await findExecutables('node', { PATH: mockPATH });
+        expect(result.length).toEqual(2);
+        expect(result[0]).toEqual(mockBinPath1);
+        expect(result[1]).toEqual(mockBinPath2);
+      });
+    });
+  });
+
 });

packages/@ionic/utils-subprocess/src/index.ts

@@ -1,7 +1,8 @@
-import { filter, reduce } from '@ionic/utils-array';
+import { concurrentFilter, map } from '@ionic/utils-array';
 import { isExecutableFile } from '@ionic/utils-fs';
 import { createProcessEnv, getPathParts } from '@ionic/utils-process';
 import { WritableStreamBuffer } from '@ionic/utils-stream';
+import { TERMINAL_INFO } from '@ionic/utils-terminal';
 import { ChildProcess, ForkOptions, SpawnOptions, fork as _fork } from 'child_process';
 import * as crossSpawn from 'cross-spawn';
 import * as os from 'os';
@@ -254,44 +255,32 @@ export function fork(modulePath: string, args: readonly string[] = [], options:
 
 export interface WhichOptions {
   PATH?: string;
+  PATHEXT?: string;
 }
 
+const DEFAULT_PATHEXT = TERMINAL_INFO.windows ? '.COM;.EXE;.BAT;.CMD' : undefined;
+
 /**
  * Find the first instance of a program in PATH.
  *
  * If `program` contains a path separator, this function will merely return it.
  *
  * @param program A command name, such as `ionic`
  */
-export async function which(program: string, { PATH = process.env.PATH || '' }: WhichOptions = {}): Promise<string> {
+export async function which(program: string, { PATH = process.env.PATH, PATHEXT = process.env.PATHEXT || DEFAULT_PATHEXT }: WhichOptions = {}): Promise<string> {
   if (program.includes(pathlib.sep)) {
     return program;
   }
 
-  const pathParts = getPathParts(PATH);
-
-  const value = await reduce<string, string | null>(pathParts, async (acc, v) => {
-    // acc is no longer null, so we found the first match already
-    if (acc) {
-      return acc;
-    }
-
-    const p = pathlib.join(v, program);
-
-    if (await isExecutableFile(p)) {
-      return p;
-    }
+  const results = await _findExecutables(program, { PATH });
 
-    return null; // tslint:disable-line:no-null-keyword
-  }, null); // tslint:disable-line:no-null-keyword
-
-  if (!value) {
+  if (!results.length) {
     const err: NodeJS.ErrnoException = new Error(`${program} cannot be found within PATH`);
     err.code = 'ENOENT';
     throw err;
   }
 
-  return value;
+  return results[0];
 }
 
 /**
@@ -302,10 +291,28 @@ export async function which(program: string, { PATH = process.env.PATH || '' }:
  *
  * @param program A command name, such as `ionic`
  */
-export async function findExecutables(program: string, { PATH = process.env.PATH || '' }: WhichOptions = {}): Promise<string[]> {
+export async function findExecutables(program: string, { PATH = process.env.PATH, PATHEXT = process.env.PATHEXT || DEFAULT_PATHEXT }: WhichOptions = {}): Promise<string[]> {
   if (program.includes(pathlib.sep)) {
     return [program];
   }
 
-  return filter(getPathParts(PATH).map(p => pathlib.join(p, program)), async p => isExecutableFile(p));
+  return _findExecutables(program, { PATH });
+}
+
+async function _findExecutables(program: string, { PATH = process.env.PATH, PATHEXT = process.env.PATHEXT || DEFAULT_PATHEXT }: WhichOptions = {}): Promise<string[]> {
+  const pathParts = getPathParts(PATH);
+  let programNames: string[];
+
+  // if windows, cycle through all possible executable extensions
+  // ex: node.exe, npm.cmd, etc.
+  if (TERMINAL_INFO.windows) {
+    const exts = getPathParts(PATHEXT).map(ext => ext.toLowerCase());
+    // don't append extensions if one has already been provided
+    programNames = exts.includes(pathlib.extname(program).toLowerCase()) ? [program] : exts.map(ext => program + ext);
+  } else {
+    programNames = [program];
+  }
+
+  return ([] as string[]).concat(...await map(programNames, async (programName): Promise<string[]> =>
+    concurrentFilter(pathParts.map(p => pathlib.join(p, programName)), async p => isExecutableFile(p))));
 }