alecthomas/kong

Xor is ignored with positional arguments

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#255 opened on Dec 22, 2021

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enhancementhelp wanted

Description

I would like to do something like:

run --defaults

or:

run foo bar

but prevent:

run --defaults foo bar

It seems xor for positional arguments (flag with arg:"") does not do anything: there is no error if both are provided.

Contributor guide

Tech stack
go
Domain
cli
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
Go programmingKong library basics
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
65
Research direction
Investigate the `xor` handling in the Kong library, specifically for positional arguments defined with `arg:''`. Look at the validation logic in the `parser.go` or similar files where constraints are checked. Review existing tests for xor behavior to understand the expected error handling. Check comments in the issue for any proposed solutions or pointers from maintainers.