feat: add file matcher

.eslintrc.js

@@ -66,6 +66,8 @@ module.exports = {
     '@typescript-eslint/no-useless-constructor': 'error',
     'no-empty-function': 'off',
     '@typescript-eslint/no-empty-function': 'error',
+    'no-shadow': 'off',
+    '@typescript-eslint/no-shadow': 'error',
   },
   overrides: [
     {

packages/game/src/condition/FileMatcher.ts

@@ -0,0 +1,15 @@
+import { FileInput, IFileExistenceChecker } from '../types'
+
+interface FileExistenceInput extends FileInput {
+  exists: boolean
+}
+
+export async function checkFiles(
+  checker: IFileExistenceChecker,
+  files: FileExistenceInput[]
+) {
+  const existences = await Promise.all(
+    files.map((file) => checker.exists(file))
+  )
+  return existences.every((exists, index) => exists === files[index].exists)
+}

packages/game/src/types.ts

@@ -13,3 +13,17 @@ export interface ICondition {
   or?: ICondition[]
   not?: ICondition
 }
+
+export enum FileType {
+  FILE = 'file',
+  FOLDER = 'folder',
+}
+
+export interface FileInput {
+  path: string
+  type: FileType
+}
+
+export interface IFileExistenceChecker {
+  exists(file: FileInput): Promise<boolean>
+}

packages/game/test/asyncCondition.test.ts

@@ -0,0 +1,92 @@
+import { test, expect } from '@jest/globals'
+import { IFileExistenceChecker, FileType, FileInput } from '../src/types.js'
+import { checkFiles } from '../src/condition/FileMatcher.js'
+
+class MockFileChecker implements IFileExistenceChecker {
+  private files: FileInput[] = [
+    {
+      path: '/home/user/hello.txt',
+      type: FileType.FILE,
+    },
+    {
+      path: '/home/user/world.txt',
+      type: FileType.FILE,
+    },
+    {
+      path: '/home/user/Downloads',
+      type: FileType.FOLDER,
+    },
+  ]
+
+  async exists(file: FileInput): Promise<boolean> {
+    return this.files.some((f) => f.path === file.path && f.type === file.type)
+  }
+}
+
+test('file matcher', async () => {
+  const checker = new MockFileChecker()
+  expect(
+    await checkFiles(checker, [
+      {
+        path: '/home/user/hello.txt',
+        type: FileType.FILE,
+        exists: true,
+      },
+    ])
+  ).toBe(true)
+  expect(
+    await checkFiles(checker, [
+      {
+        path: '/home/user/not-exists.txt',
+        type: FileType.FILE,
+        exists: true,
+      },
+    ])
+  ).toBe(false)
+  expect(
+    await checkFiles(checker, [
+      {
+        path: '/home/user/not-exists.txt',
+        type: FileType.FILE,
+        exists: false,
+      },
+    ])
+  ).toBe(true)
+  expect(
+    await checkFiles(checker, [
+      {
+        path: '/home/user/Downloads',
+        type: FileType.FOLDER,
+        exists: true,
+      },
+    ])
+  ).toBe(true)
+  expect(
+    await checkFiles(checker, [
+      {
+        path: '/home/user/hello.txt',
+        type: FileType.FILE,
+        exists: true,
+      },
+      {
+        path: '/home/user/Downloads',
+        type: FileType.FOLDER,
+        exists: true,
+      },
+    ])
+  ).toBe(true)
+  expect(
+    await checkFiles(checker, [
+      {
+        path: '/home/user/hello.txt',
+        type: FileType.FILE,
+        exists: true,
+      },
+      {
+        path: '/home/user/not-exist.txt',
+        type: FileType.FILE,
+        exists: true,
+      },
+    ])
+  ).toBe(false)
+})