[stdlib] Implement mkdir and rmdir

stdlib/src/os/__init__.mojo

@@ -15,5 +15,15 @@
 from .atomic import Atomic
 from .env import setenv, getenv
 from .fstat import lstat, stat, stat_result
-from .os import abort, listdir, remove, unlink, SEEK_SET, SEEK_CUR, SEEK_END
+from .os import (
+    abort,
+    listdir,
+    remove,
+    unlink,
+    SEEK_SET,
+    SEEK_CUR,
+    SEEK_END,
+    mkdir,
+    rmdir,
+)
 from .pathlike import PathLike

stdlib/src/os/os.mojo

@@ -277,7 +277,7 @@ fn remove(path: String) raises:
       path: The path to the file.
 
     """
-    var error = external_call["unlink", Int](path._as_ptr())
+    var error = external_call["unlink", Int32](path._as_ptr())
 
     if error != 0:
         # TODO get error message, the following code prints it
@@ -327,3 +327,60 @@ fn unlink[pathlike: os.PathLike](path: pathlike) raises:
 
     """
     remove(path.__fspath__())
+
+
+# ===----------------------------------------------------------------------=== #
+# mkdir/rmdir
+# ===----------------------------------------------------------------------=== #
+
+
+fn mkdir(path: String, mode: Int = 0o777) raises:
+    """Creates a directory at the specified path.
+    If the directory can not be created an error is raised.
+    Absolute and relative paths are allowed, relative paths are resolved from cwd.
+
+    Args:
+      path: The path to the directory.
+      mode: The mode to create the directory with.
+    """
+
+    var error = external_call["mkdir", Int32](path._as_ptr(), mode)
+    if error != 0:
+        raise Error("Can not create directory: " + path)
+
+
+fn mkdir[pathlike: os.PathLike](path: pathlike, mode: Int = 0o777) raises:
+    """Creates a directory at the specified path.
+    If the directory can not be created an error is raised.
+    Absolute and relative paths are allowed, relative paths are resolved from cwd.
+
+    Args:
+      path: The path to the directory.
+      mode: The mode to create the directory with.
+    """
+
+    mkdir(path.__fspath__(), mode)
+
+
+fn rmdir(path: String) raises:
+    """Removes the specified directory.
+    If the path is not a directory or it can not be deleted, an error is raised.
+    Absolute and relative paths are allowed, relative paths are resolved from cwd.
+
+    Args:
+      path: The path to the directory.
+    """
+    var error = external_call["rmdir", Int32](path._as_ptr())
+    if error != 0:
+        raise Error("Can not remove directory: " + path)
+
+
+fn rmdir[pathlike: os.PathLike](path: pathlike) raises:
+    """Removes the specified directory.
+    If the path is not a directory or it can not be deleted, an error is raised.
+    Absolute and relative paths are allowed, relative paths are resolved from cwd.
+
+    Args:
+      path: The path to the directory.
+    """
+    rmdir(path.__fspath__())

stdlib/test/os/test_mkdir_and_rmdir.mojo

@@ -0,0 +1,121 @@
+# ===----------------------------------------------------------------------=== #
+# Copyright (c) 2024, Modular Inc. All rights reserved.
+#
+# Licensed under the Apache License v2.0 with LLVM Exceptions:
+# https://llvm.org/LICENSE.txt
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# ===----------------------------------------------------------------------=== #
+# RUN: %mojo %s
+
+from os import mkdir, rmdir, remove
+from os.path import exists
+from pathlib import Path
+
+from testing import assert_true, assert_false, assert_raises
+
+
+fn create_dir_and_test_delete_string[
+    func_create: fn (String, Int) raises -> None,
+    func_delete: fn (String) raises -> None,
+](dir_name: String) raises:
+    # verify that the test dir does not exist before starting the test
+    assert_false(
+        exists(dir_name),
+        "Unexpected dir " + dir_name + " it should not exist",
+    )
+
+    func_create(dir_name, 0o777)
+    assert_true(exists(dir_name))
+
+    func_delete(dir_name)
+    # trying to delete non existing dir
+    with assert_raises(contains="Can not remove directory: "):
+        func_delete(dir_name)
+
+
+fn create_dir_and_test_delete_path[
+    func_create: fn[pathlike: PathLike] (pathlike, Int) raises -> None,
+    func_delete: fn[pathlike: PathLike] (pathlike) raises -> None,
+](dir_path: Path) raises:
+    # verify that the test dir does not exist before starting the test
+    assert_false(
+        exists(dir_path),
+        "Unexpected dir " + dir_path.__fspath__() + " it should not exist",
+    )
+
+    func_create(dir_path, 0o777)
+    assert_true(exists(dir_path))
+
+    func_delete(dir_path)
+    # trying to delete non existing dir
+    with assert_raises(contains="Can not remove directory: "):
+        func_delete(dir_path)
+
+
+fn test_mkdir_and_rmdir() raises:
+    var cwd_path = Path()
+    var my_dir_path = cwd_path / "my_dir"
+    var my_dir_name = str(my_dir_path)
+
+    create_dir_and_test_delete_path[mkdir, rmdir](my_dir_path)
+    create_dir_and_test_delete_string[mkdir, rmdir](my_dir_name)
+
+    # test relative path
+    create_dir_and_test_delete_string[mkdir, rmdir]("my_relative_dir")
+    create_dir_and_test_delete_path[mkdir, rmdir](Path("my_relative_dir"))
+
+
+fn test_mkdir_mode() raises:
+    var cwd_path = Path()
+    var my_dir_path = cwd_path / "my_dir"
+    var file_name = my_dir_path / "file.txt"
+
+    assert_false(
+        exists(my_dir_path),
+        "Unexpected dir " + my_dir_path.__fspath__() + " it should not exist",
+    )
+
+    # creating dir without writing permission
+    mkdir(my_dir_path, 0o111)
+
+    with assert_raises(contains="Permission denied"):
+        var file = open(file_name, "w")
+        file.close()
+        if exists(file_name):
+            remove(file_name)
+
+    if exists(my_dir_path):
+        rmdir(my_dir_path)
+
+
+fn test_rmdir_not_emty() raises:
+    var cwd_path = Path()
+    var my_dir_path = cwd_path / "my_dir"
+    var file_name = my_dir_path / "file.txt"
+
+    assert_false(
+        exists(my_dir_path),
+        "Unexpected dir " + my_dir_path.__fspath__() + " it should not exist",
+    )
+
+    mkdir(my_dir_path)
+    with open(file_name, "w"):
+        pass
+
+    with assert_raises(contains="Can not remove directory: "):
+        rmdir(my_dir_path)
+
+    remove(file_name)
+    rmdir(my_dir_path)
+    assert_false(exists(my_dir_path), "Failed to remove dir")
+
+
+fn main() raises:
+    test_mkdir_and_rmdir()
+    test_mkdir_mode()
+    test_rmdir_not_emty()