Ensure vendor beside composer.json is used (#97)

Author: janedbal

src/ComposerJson.php

@@ -18,6 +18,7 @@
 use function json_decode;
 use function json_last_error;
 use function json_last_error_msg;
+use function preg_match;
 use function realpath;
 use function rtrim;
 use function strpos;
@@ -193,11 +194,21 @@ private function resolveComposerAutoloadPath(string $basePath, string $vendorDir
     {
         $vendorDir = rtrim($vendorDir, '/');
 
-        if (is_dir($vendorDir)) {
+        if ($this->isAbsolutePath($vendorDir)) {
             return $vendorDir . '/autoload.php';
         }
 
         return $basePath . '/' . $vendorDir . '/autoload.php';
     }
 
+    /**
+     * Based on Nette\Utils\FileSystem::isAbsolute
+     *
+     * @license https://github.com/nette/utils/blob/v4.0.4/license.md
+     */
+    private function isAbsolutePath(string $vendorDir): bool
+    {
+        return (bool) preg_match('#([a-z]:)?[/\\\\]|[a-z][a-z0-9+.-]*://#Ai', $vendorDir);
+    }
+
 }

tests/ComposerJsonTest.php

@@ -3,9 +3,11 @@
 namespace ShipMonk\ComposerDependencyAnalyser;
 
 use PHPUnit\Framework\TestCase;
+use function chdir;
 use function dirname;
 use function file_put_contents;
 use function json_encode;
+use function mkdir;
 use function realpath;
 use function sys_get_temp_dir;
 
@@ -60,4 +62,32 @@ public function testAbsoluteCustomVendorDir(): void
         );
     }
 
+    /**
+     * @runInSeparateProcess Do not spread chdir changes
+     */
+    public function testUseVendorBesideGivenComposerJsonNotCwdOne(): void
+    {
+        self::assertDirectoryExists(__DIR__ . '/data'); // precondition
+
+        chdir(__DIR__);
+
+        $generatedComposerJson = sys_get_temp_dir() . '/vendor-beside/composer.json';
+        mkdir(dirname($generatedComposerJson), 0777, true);
+        file_put_contents($generatedComposerJson, json_encode([
+            'require' => [
+                'nette/utils' => '^3.0',
+            ],
+            'config' => [
+                'vendor-dir' => 'data',
+            ],
+        ]));
+
+        $composerJson = new ComposerJson($generatedComposerJson);
+
+        self::assertSame(
+            sys_get_temp_dir() . '/vendor-beside/data/autoload.php',
+            $composerJson->composerAutoloadPath
+        );
+    }
+
 }