Drop-in substitute for argparse that reads config files
Project description
configparse
Summary
configparse is a drop-in-place replacement for python's argparse
module
which reads configuration files in addition to command line arguments.
Features
If the configuration directory exists, all of files in <config_directory>/<prog>/
are read.
All files matching ~/.<prog>*
are read.
Files are treated according to their extension: config.json
will be parsed as JSON,
myconf.yml
will be parsed as YAML.
If a file does not have an extension, it will be parsed according to the default file format. This is preset to JSON, but can be changed by applications.
Configuration Directory
On Windows, the configuration directory looked up in %AppData%
.
On any other OS, it is looked up from $XDG_CONFIG_HOME
.
If the variable is not present (on any OS), files are read from ~/.config
.
Supported Formats
The following file formats are currently supported:
- JSON (.json)
- YAML (.yml)
- INI (.ini)
- TOML (.toml)
Feel free to submit a pull request adding more formats. See CONTRIBUTING.md for an overview, if you already have a parser it should be very simple.
Using configparse
As a library
If you are an application developer who wants to use the library,
there is one entry point: the ConfigParser
class,
which is also aliased to Parser
for convenience.
You can treat a ConfigParser
instance exactly as you would an ArgumentParser
instance (as long as you pass prog
to the constructor).
Note that this means that parse_args
will parse sys.argv
in addition to parsing configuration files. If you don't want this behavior,
pass an empty list to parse_args
like this: args = parser.parse_args([])
.
If you want to change the default file format (e.g. for files named ~/.myprog
without an extension), use parser.set_default_ext(ext)
, where 'ext' is the
file extension for your format.
Differences from argparse
The only API differences are as follows:
- the name of the parser is
ConfigParser
, notArgumentParser
- the
prog
keyword is required for initializingConfigParser
(so that it knows where to look for configuration files)
That's it. Everything else is done automatically.
Example
from configparse import Parser
parser = Parser(prog='myprogram')
parser.add_argument('--short', '-s', help='use short format')
args = parser.parse_args()
As an end user
You can put a configuration file in any of the following locations:
~/.config/<prog>/
~/.<prog>*
See Features
for a full overview.
Example
Assume that the program basic
takes the arguments '--short' and '--long'.
$ cat ~/.config/basic/config.yml
short: true
$ basic
You chose the 'short' option.
$ rm ~/.config/basic/config.yml
$ echo 'long: true' > ~/.basic.yml
$ basic
You chose the 'long' option.
Limitations
- Only long options will be applied. If a short option is present in a config file,
it will be treated as if it were a long option, i.e. not looked up.
For example, assuming some backend returns the dictionary
{'s': 'some value'}
:
from configparse import Parser
p = Parser(prog='myprog')
p.add_argument('-s', '--short')
args = p.parse_args()
assert args.short is None
assert args.s == 'some value'
Project details
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