Skip unknown options while parsing env vars

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
35/100
Issue type
Feature
Clarity
Mostly clear
Activity status
Stale
Tech stack
cpp
Domain
cli

Research direction

Start by tracing parse_environment() and the subsequent store() call to see where prefixed variables become program options and where unknown_option is raised. The work is done when unrecognized prefixed environment variables are ignored while recognized options continue to be stored, with coverage added for both cases.

Written by the indexing model from the issue text.

Description

When using parse_environment() It will be convenient to skip environment variables not recognized as program options that still have the specified prefix.

At the moment all the environment variables that start with the specified prefix are collected and a subsequent call to store() will raise a unknown_option exception

Dominant language
C++
Stars
136
Forks
117
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