Using negative flag forms (e.g. no-header, no-annotate) in config has no effect

[AndydeCleyre]

When testing out the new config behavior, if I add entries to [tool.pip-tools] like

no-annotate = true

or

no-header = true

then there are two surprises:

• the option does not take effect; it must be given in the positive form (annotate = false and header = false)
• there is no warning or error about unknown options being given, making this problem easy to miss

Environment Versions

1. Linux
2. Python version: 3.10.6
3. pip version: 23.1.2
4. pip-tools version: 6.14.0

Steps to replicate

$ git clone https://github.com/jazzband/pip-tools
$ cd pip-tools
$ printf '%s\n' '[tool.pip-tools]' 'no-annotate = true' >>pyproject.toml
$ printf '%s\n' httpx >requirements.in
$ python -m venv .venv
$ . ./.venv/bin/activate
$ pip install -U pip pip-tools
$ pip-compile requirements.in

Expected result

Either

• there be no annotations in the output, since --no-annotate is a valid flag, and --no-annotate should also appear in the generated header, or
• a warning or error should be presented due to an unrecognized option being supplied

Actual result

WARNING: the legacy dependency resolver is deprecated and will be removed in future versions of pip-tools. The default resolver will be changed to 'backtracking' in pip-tools 7.0.0. Specify --resolver=backtracking to silence this warning.
#
# This file is autogenerated by pip-compile with Python 3.10
# by the following command:
#
#    pip-compile requirements.in
#
anyio==3.7.1
    # via httpcore
certifi==2023.5.7
    # via
    #   httpcore
    #   httpx
exceptiongroup==1.1.2
    # via anyio
h11==0.14.0
    # via httpcore
httpcore==0.17.3
    # via httpx
httpx==0.24.1
    # via -r requirements.in
idna==3.4
    # via
    #   anyio
    #   httpx
sniffio==1.3.0
    # via
    #   anyio
    #   httpcore
    #   httpx

[chrysle]

Can reproduce this. Working on a fix.

[chrysle]

• there be no annotations in the output, since --no-annotate is a valid flag, and --no-annotate should also appear in the generated header

I've tracked this down and it looks like click currently doesn't allow for setting default values for negating boolean flags. This means annotate = false is the equivalent for no_annotate = true.

I've tried implementing a feature switch, but that doesn't work either.

[atugushev]

@AndydeCleyre could you try this draft #1910?