utils.py

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import contextlib
import os
import shutil
import sys
import tempfile
from typing import Iterator, Optional
 
 
@contextlib.contextmanager
def temporary_directory():
    # type: () -> Iterator[str]
    if sys.version_info >= (3, 2):
        with tempfile.TemporaryDirectory() as td:
            yield td
    else:
        td = tempfile.mkdtemp()
        try:
            yield td
        finally:
            try:
                shutil.rmtree(td)
            except Exception:
                pass
 
 
def message_path(path, message_name=None):
    # type: (str, Optional[str]) -> str
    ret = os.path.join(path, "msg")
    if message_name is None:
        return ret
 
    return os.path.join(ret, "{}.msg".format(message_name))
 
 
def service_path(path, service_name=None):
    # type: (str, Optional[str]) -> str
    ret = os.path.join(path, "srv")
    if service_name is None:
        return ret
 
    return os.path.join(ret, "{}.srv".format(service_name))
 
 
def assert_output_equals(expeced_dir, actual_dir, filename):
    # type: (str, str, str) -> None
    expected_path = os.path.join(expeced_dir, filename)
    actual_path = os.path.join(actual_dir, filename)
 
    assert os.path.exists(expected_path), "Expected file not found"
    assert os.path.exists(actual_path), "File is not generated with the expected name"
 
    with open(expected_path) as f:
        expected = f.read()
 
    with open(actual_path) as f:
        actual = f.read()
 
    assert expected == actual