env vars not loaded when a "nargs=REMAINDER" argument is used

[ndamclean]

Example Script (tmp.py)

import configargparse


parser = configargparse.ArgumentParser()
parser.add_argument('--rawr', required=True, env_var='RAWR')
parser.add_argument(
    '--leftovers',
    default=[],
    nargs=configargparse.REMAINDER,
)

args = parser.parse_args()
print(args)

run tmp.py using bash shell

command

RAWR=rawr python tmp.py --leftovers x

output

usage: tmp.py [-h] --rawr RAWR [--leftovers ...]
tmp.py: error: the following arguments are required: --rawr

command

RAWR=rawr python tmp.py

output

Namespace(leftovers=[], rawr='rawr')

System Info

• python 3.6.7
• ConfigArgParse 0.14.0

[ndamclean]

The problem is caused by this line, which appends the env var arg values to the list of CLI args, causing them to be consumed by the nargs=REMAINDER argument.

https://github.com/bw2/ConfigArgParse/blob/8bbc7de67f884184068d62af7f78e723d01c0081/configargparse.py#L448

A simple solution would be to change this to:

args = env_var_args + args 

However, I'm not clear if this would affect other parts of the code.