Minimal library for command-line applications.
Project description
A4 – Minimal library for command-line applications.
The name comes from A4 paper. It provides absolutely minimal (but not lousy) support for command-line applications.
A4 is listed on PyPI.
Simple logging
a4.log
implements minimal logging with three major features which, in my
highly opinionated opinion, should be included in all logging libraries:
- Levels.
- Colors.
- Timestamps.
You may print all logs to stderr with a4.log.fork=True
(default False
).
Yet another command-line application decorator
a4.app
provides a decorator Runnable
to convert a class into a runnable
command-line application. All class methods NOT starting with understore
are recognized as sub-commands. This pattern offers more convenience over
single-function decorators when multiple commands require shared resources.
import a4
from a4.app import AppBase, Runnable
@Runnable
class MyApp(AppBase):
def __init__(self):
AppBase.__init__(self)
def gen_calendar(self, args):
"""<yyyy> mmdd-mmdd [mmdd-mmdd ...]
Generate trading calendar for one year.
-c <cal_id> calendar ID, default 86
"""
opts, args = a4.get_opts('c:', args)
if len(args) < 2:
self._die_usage()
cal_id = int(opts['c'] or '86')
self._log(f'calendar id = {cal_id}')
if __name__ == '__main__':
MyApp().run()
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