Version v1.2.7 as of 2024-10-02 see Changelog
small toolset to properly exit a cli application:
- print the traceback information (can be set with commandline option)
- get a proper exit code from the Exception
- flush the streams, to make sure output is written in proper order
- demo how to integrate into Your cli module (see usage)
automated tests, Github Actions, Documentation, Badges, etc. are managed with PizzaCutter (cookiecutter on steroids)
Python version required: 3.8.0 or newer
tested on recent linux with python 3.8, 3.9, 3.10, 3.11, 3.12, pypy-3.9, pypy-3.10, graalpy-24.1 - architectures: amd64
100% code coverage, flake8 style checking ,mypy static type checking ,tested under Linux, macOS, Windows, automatic daily builds and monitoring
- Try it Online
- Usage
- Usage from Commandline
- Installation and Upgrade
- Requirements
- Acknowledgements
- Contribute
- Report Issues
- Pull Request
- Code of Conduct
- License
- Changelog
You might try it right away in Jupyter Notebook by using the "launch binder" badge, or click here
- example for the main_cli
# STDLIB
import platform
import signal
import sys
from typing import Any
from typing import Callable
from typing import Optional
from typing import Union
from types import FrameType
# EXT
import click
# CONSTANTS
CLICK_CONTEXT_SETTINGS = dict(help_option_names=["-h", "--help"])
try:
from . import __init__conf__
from . import cli_exit_tools
except (ImportError, ModuleNotFoundError): # pragma: no cover
# imports for doctest
import __init__conf__ # type: ignore # pragma: no cover
import cli_exit_tools # type: ignore # pragma: no cover
is_platform_windows = platform.system().lower() == "windows"
is_platform_linux = platform.system().lower() == "linux"
is_platform_darwin = platform.system().lower() == "darwin"
is_platform_posix = not is_platform_windows
class SigIntError(Exception):
"""wird bei Signal SigInt ausgelöst"""
pass
class SigTermError(Exception):
"""wird bei Signal SigTerm ausgelöst"""
pass
if is_platform_windows:
"""import win32 api on windows systems"""
try:
import win32api # type: ignore # noqa
except ModuleNotFoundError: # for install_python_libs_python3.py - at that time pywin32 (win32api) might not be installed
pass
def _set_signal_handlers() -> None:
"""
setzt die signal handler so, das entsprechende Exceptions geraised werden.
Dies dient dazu ein sauberes Handling für Cleanup in den Applikationen
zu gewährleisten
"""
# sigterm handler setzen
if is_platform_linux:
signal.signal(signal.SIGTERM, _sigterm_handler)
elif is_platform_windows:
try:
win32api.SetConsoleCtrlHandler(_sigterm_handler, True)
except NameError: # for install_python_libs_python3.py - at that time pywin32 (win32api) might not be installed
pass
# sigint handler setzen
signal.signal(signal.SIGINT, _sigint_handler)
def _sigint_handler(_signo: int, _stack_frame: Optional[FrameType]) -> None:
raise SigIntError
def _sigterm_handler(_signo: int, _stack_frame: Optional[FrameType]) -> None:
raise SigTermError
def info() -> None:
"""
>>> info()
Info for ...
"""
__init__conf__.print_info()
@click.group(help=__init__conf__.title, context_settings=CLICK_CONTEXT_SETTINGS) # type: ignore
@click.version_option(
version=__init__conf__.version, prog_name=__init__conf__.shell_command, message=f"{__init__conf__.shell_command} version {__init__conf__.version}"
)
@click.option("--traceback/--no-traceback", is_flag=True, type=bool, default=None, help="return traceback information on cli")
def cli_main(traceback: Optional[bool] = None) -> None:
if traceback is not None:
cli_exit_tools.config.traceback = traceback
@cli_main.command("info", context_settings=CLICK_CONTEXT_SETTINGS) # type: ignore
def cli_info() -> None:
"""get program information"""
info()
# entry point if main
if __name__ == "__main__":
try:
_set_signal_handlers()
cli_main() # type: ignore
except Exception as exc:
cli_exit_tools.print_exception_message()
sys.exit(cli_exit_tools.get_system_exit_code(exc))
finally:
cli_exit_tools.flush_streams()- get the system exit code
def get_system_exit_code(exc: BaseException) -> int:
"""
Return the exit code for linux or Windows os, based on the exception.
If, on windows, the winerror code is passed with the Exception, we return that winerror code.
Parameter
---------
exc
the exception to analyze
Result
------
exit_code
as integer
Examples
--------
>>> try:
... raise RuntimeError()
... except RuntimeError as my_exc:
... assert get_system_exit_code(my_exc) == 1
... setattr(my_exc, 'winerror', 42)
... assert get_system_exit_code(my_exc) == 42
... setattr(my_exc, 'winerror', None)
... assert get_system_exit_code(my_exc) == 1
>>> try:
... exit(99)
... except SystemExit as my_exc:
... assert get_system_exit_code(my_exc) == 99
"""- print the exception message
def print_exception_message(trace_back: bool = config.traceback, length_limit: int = 500, stream: Optional[TextIO] = None) -> None:
"""
Prints the Exception Message to stderr. If trace_back is True, it also prints the traceback information.
If the exception has stdout, stderr attributes (like subprocess.CalledProcessError), those will also be printed.
Parameters
----------
trace_back : bool, optional
Whether to print traceback information. Default is False.
length_limit : int, optional
Maximum length of the exception message to be printed. Default is 500.
stream : Optional[TextIO], optional
The stream to print to. Default is sys.stderr.
Examples
--------
>>> # test with exc_info = None
>>> print_exception_message()
>>> # test with exc_info
>>> try:
... raise FileNotFoundError('unknown_command_test1')
... except Exception: # noqa
... print_exception_message(True, length_limit=15, stream=sys.stdout)
... print_exception_message(False, stream=sys.stdout)
... print_exception_message(True, stream=sys.stdout)
Traceback Info...
>>> # test with subprocess to get stdout, stderr
>>> import subprocess
>>> try:
... discard=subprocess.run('unknown_command_test2', shell=True, check=True)
... except subprocess.CalledProcessError:
... print_exception_message(False, stream=sys.stdout)
... print_exception_message(True, stream=sys.stdout)
... print_exception_message(True, stream=sys.stdout)
CalledProcessError...
"""- flush the streams
def flush_streams() -> None:
"""
flush the streams - make sure the output is written early,
otherwise the output might be printed even after another CLI
command is launched
Examples
--------
>>> flush_streams()
"""Usage: cli_exit_tools [OPTIONS] COMMAND [ARGS]... functions to exit an cli application properly Options: --version Show the version and exit. --traceback / --no-traceback return traceback information on cli -h, --help Show this message and exit. Commands: info get program information
- Before You start, its highly recommended to update pip:
python -m pip --upgrade pip
- to install the latest release from PyPi via pip (recommended):
python -m pip install --upgrade cli_exit_tools
- to install the latest release from PyPi via pip, including test dependencies:
python -m pip install --upgrade cli_exit_tools[test]
- to install the latest version from github via pip:
python -m pip install --upgrade git+https://github.com/bitranox/cli_exit_tools.git
- include it into Your requirements.txt:
# Insert following line in Your requirements.txt: # for the latest Release on pypi: cli_exit_tools # for the latest development version : cli_exit_tools @ git+https://github.com/bitranox/cli_exit_tools.git # to install and upgrade all modules mentioned in requirements.txt: python -m pip install --upgrade -r /<path>/requirements.txt
- to install the latest development version, including test dependencies from source code:
# cd ~ $ git clone https://github.com/bitranox/cli_exit_tools.git $ cd cli_exit_tools python -m pip install -e .[test]
- via makefile: makefiles are a very convenient way to install. Here we can do much more, like installing virtual environments, clean caches and so on.
# from Your shell's homedirectory:
$ git clone https://github.com/bitranox/cli_exit_tools.git
$ cd cli_exit_tools
# to run the tests:
$ make test
# to install the package
$ make install
# to clean the package
$ make clean
# uninstall the package
$ make uninstallfollowing modules will be automatically installed :
## Project Requirements
click
lib_detect_testenv- special thanks to "uncle bob" Robert C. Martin, especially for his books on "clean code" and "clean architecture"
I would love for you to fork and send me pull request for this project. - please Contribute
This software is licensed under the MIT license
---
- new MAJOR version for incompatible API changes,
- new MINOR version for added functionality in a backwards compatible manner
- new PATCH version for backwards compatible bug fixes
- 2024-10-02:
- setup-python@v5
- sigterm_handler for CLI
- graalpy 24.1 tests
- CODECOV_TOKEN
- refractor
- 2023-07-14:
- add codeql badge
- move 3rd_party_stubs outside the src directory
- add pypy 3.10 tests
- add python 3.12-dev tests
- 2023-07-13:
- require minimum python 3.8
- remove python 3.7 tests
- 2023-07-12:
- introduce PEP517 packaging standard
- introduce pyproject.toml build-system
- remove mypy.ini
- remove pytest.ini
- remove setup.cfg
- remove setup.py
- remove .bettercodehub.yml
- remove .travis.yml
- update black config
- clean ./tests/test_cli.py
2022-06-02: update to github actions checkout@v3 and setup-python@v3
2022-06-01: update github actions test matrix
2022-03-29: remedy mypy Untyped decorator makes function "cli_info" untyped
2022-03-25: fix github actions windows test
- 2021-11-22: Patch Release
- fix minor readme.rst bugs
- remove second github action yml
- fix "setup.py test"
- 2021-11-21: Minor Release
- implement github actions
- implement system.exit()
- 2020-10-09: service release
- update travis build matrix for linux 3.9-dev
- update travis build matrix (paths) for windows 3.9 / 3.10
- 2020-08-08: service release
- fix documentation
- fix travis
- deprecate pycodestyle
- implement flake8
2020-08-07: fix wheels
2020-07-31: fix wheels
2020-07-31: initial release