cfgtools - Configuration file fun

Functions for working with configuration file selection and reading.

The which() convenience function returns the first file that should be used as configuration file from a list.

torxtools.cfgtools.candidates(cfgname: str = None) → List[str]

Convenience function to return list of candidates paths for a configuration file.

Parameters:

cfgfile (str, None) – a single path. If not None, then it will be returned without calling the verify function.

Returns:

list of paths that are candidates

Return type:

list[str]

torxtools.cfgtools.which(cfgfile: str = None, candidates: ~typing.List[str] = None, default: str = '/dev/null', verify: ~typing.Callable = <function exists>) → str | None

Convenience function to return the configuration file to read.

Parameters:

• cfgfile (str, None) – a single path. If not None, then it will be returned without calling the verify function.

• candidates (t.List[str], None) –

  a list of paths. If cfgfile is None, then the verify function will be called for each of these paths and the first one for which verify returns True will be returned.

  If no file is matched, then /dev/null will be returned.

• verify (t.Callable) – callable that will be called for every file in candidate. Defaults to os.path.exists.

• default (str, None) – value to be returned if cfgfile is None and no match from candidates was found

Returns:

cfgfile, a value from candidates, or default

Return type:

str

Example

import argparse, sys
from torxtools import cfgtools, pathtools

defaults = pathtools.expandpath(["~/.my-cfgfile"], ["/etc/cfgfile"])

parser = argparse.ArgumentParser()
parser.add_argument("--cfgfile")
args = parser.parse_args(sys.argv[:1])

print(cfgtools.which(args.cfgfile, defaults))