[Feature Request] User provided Help exit code

[vipcxj]

There is a project argonaut I'm working on; this tool is used to simplify defining command-line arguments in the shell, similar to what cobra does in Go. Here is an example to help illustrate the issue.

This is a script the user wrote: cool.sh

#!/bin/bash
set -e
EVAL_CONTENT=`argonaut bind \
  --flag=flag1 \
  --flag-flag1-default=hello \\
  --flag-flag1-choices=hello,world \
  --flag=flags2 \
  --flag-flags2-multi=true \
  --flag-flags2-choices=one,two,three
  -- "$0" "$@"
`
eval "$EVAL_CONTENT"

Then run

./cool.sh --flags2 one --flags2 three

EVAL_CONTENT will be assigned

FLAG1='hello'
FLAG2='one,three'

So after executing eval, the user can directly use these two environment variables in their own scripts.
If you enter the wrong parameters, for example

./cool.sh --flags2 one --flags2 four

will output

Error: value four for flag flags2 is not in allowed choices [one two three]
Usage:
  cool.sh [flags]

Flags:
--flag1 string          (default "hello")
      --flags2 stringArray
  -h, --help                 help for cool.sh

So far, everything has worked perfectly, until I executed

./cool.sh --help

It's a complete disaster. Because EVAL_CONTENT will become the help message, and eval will obviously throw an error. The workaround I can think of right now is

1. Redirect the help message output to stderr
2. Return a nonzero exit code

As for redirecting the help output, I've already found the API, but when dealing with the latter I discovered that cobra doesn't support customizing the help's return value, because help never reaches the Run method and is handled by cobra beforehand, even if I define the help flag myself. I even think this is a bug: if the user defines help themselves, it indicates they want to handle help requests themselves, not have the framework do it.