allow to run generators using relative paths. (#507)

src/environment-full.ts

@@ -1,5 +1,5 @@
 import { createHash } from 'node:crypto';
-import { join } from 'node:path';
+import { join, resolve } from 'node:path';
 import type { BaseGeneratorConstructor, InputOutputAdapter } from '@yeoman/types';
 import { type YeomanNamespace, requireNamespace, toNamespace } from '@yeoman/namespace';
 import { flyImport } from 'fly-import';
@@ -343,11 +343,15 @@ class FullEnvironment extends EnvironmentBase {
     args = Array.isArray(args) ? args : splitArgsFromString(args as unknown as string);
     options = { ...options };
 
-    const name = args.shift();
+    let name = args.shift();
     if (!name) {
       throw new Error('Must provide at least one argument, the generator namespace to invoke.');
     }
 
+    if (name.startsWith('.')) {
+      name = resolve(name);
+    }
+
     this.loadEnvironmentOptions(options);
 
     if (this.experimental && !this.getGeneratorMeta(name)) {

test/environment.js

@@ -2,6 +2,7 @@
 import events from 'node:events';
 import fs from 'node:fs';
 import path, { dirname, join } from 'node:path';
+import process from 'node:process';
 import util from 'node:util';
 import { fileURLToPath } from 'node:url';
 import { createRequire } from 'node:module';
@@ -381,6 +382,20 @@ for (const generatorVersion of allVersions) {
         });
       });
 
+      describe('using relative paths', () => {
+        let oldCwd;
+        before(() => {
+          oldCwd = process.cwd();
+          process.chdir(dirname(fileURLToPath(import.meta.url)));
+        });
+        after(() => {
+          process.chdir(oldCwd);
+        });
+        it('runs a generator', async function () {
+          return this.env.run(['./fixtures/generator-esm/generators/app/index.js']);
+        });
+      });
+
       it('runs a registered writing generator with bail option', async function () {
         if (isLegacyVersion(generatorVersion)) {
           this.skip();