feat!: make Path::dirname() null if no parent dir

README.md

@@ -86,15 +86,15 @@ $node->path()->toString(); // string - the full path
 $node->path()->name(); // string - filename with extension
 $node->path()->basename(); // string - filename without extension
 $node->path()->extension(); // string|null - file extension
-$node->path()->dirname(); // string - the parent directory
+$node->path()->dirname(); // string|null - the parent directory (or null if there is none)
 
 $node->dsn(); // Zenstruck\Filesystem\Node\Dsn
 $node->dsn()->toString(); // string - <filesystem-name>://<full-path>
 (string) $node->dsn(); // same as above
 $node->dsn()->path(); // Zenstruck\Filesystem\Node\Path
 $node->dsn()->filesystem(); // string - name of the filesystem this node belongs to
 
-$node->directory(); // Zenstruck\Filesystem\Node\Directory|null - parent directory object
+$node->directory(); // Zenstruck\Filesystem\Node\Directory|null - parent directory object (or null if there is none)
 
 $node->visibility(); // string - ie "public" or "private"
 $node->lastModified(); // \DateTimeImmutable (in currently configured timezone)

src/Filesystem/Node/FlysystemNode.php

@@ -51,7 +51,7 @@ public function directory(): ?Directory
     {
         $dirname = $this->path()->dirname();
 
-        return '.' === $dirname ? null : new FlysystemDirectory($dirname, $this->operator);
+        return null === $dirname ? null : new FlysystemDirectory($dirname, $this->operator);
     }
 
     public function lastModified(): \DateTimeImmutable

src/Filesystem/Node/Path.php

@@ -62,9 +62,15 @@ public function basename(): string
         return $this->nameParts()[0];
     }
 
-    public function dirname(): string
+    public function dirname(): ?string
     {
-        return \dirname($this->value);
+        if (!$this->value) {
+            return null;
+        }
+
+        $dirname = \dirname($this->value);
+
+        return '.' === $dirname ? '' : $dirname;
     }
 
     /**

tests/Filesystem/Node/DirectoryTests.php

@@ -39,7 +39,8 @@ public function metadata(): void
 
         $dir = $this->createDirectory(fixture('sub1'), 'foo');
 
-        $this->assertNull($dir->directory());
+        $this->assertSame('', $dir->directory()->path()->toString());
+        $this->assertNull($dir->directory()->directory());
     }
 
     /**

tests/Filesystem/Node/PathTest.php

@@ -31,4 +31,22 @@ public function can_handle_multi_part_extensions(): void
         $this->assertSame('bar', $path->basename());
         $this->assertSame('foo', $path->dirname());
     }
+
+    /**
+     * @test
+     * @dataProvider dirnameProvider
+     */
+    public function dirname(string $path, ?string $expected): void
+    {
+        $this->assertSame($expected, (new Path($path))->dirname());
+    }
+
+    public static function dirnameProvider(): iterable
+    {
+        yield 'empty' => ['', null];
+        yield 'one level' => ['foo', ''];
+        yield 'one level trailing slash' => ['foo/', ''];
+        yield 'two levels' => ['foo/bar', 'foo'];
+        yield 'two levels trailing slash' => ['foo/bar/', 'foo'];
+    }
 }

tests/FilesystemTest.php

@@ -263,6 +263,18 @@ public function can_chmod(): void
         $this->assertSame('private', $fs->file('some/file.txt')->visibility());
     }
 
+    /**
+     * @test
+     */
+    public function root_parent_dir(): void
+    {
+        $fs = $this->createFilesystem();
+
+        $fs->write('foo/bar.txt', 'content');
+
+        $this->assertNull($fs->directory()->directory());
+    }
+
     /**
      * @test
      * @dataProvider writeValueProvider