Moves the new rule from nursery to preview for the upcoming release.
Adds new test coverage for selection of a single preview rule and fixes
a bug where preview rules were incorrectly selectable with exact codes.
## Summary
<!-- What's the purpose of the change? What does it do, and why? -->
Extends work in #7046 (some relevant discussion there)
Changes:
- All nursery rules are now referred to as preview rules
- Documentation for the nursery is updated to describe preview
- Adds a "PREVIEW" selector for preview rules
- This is primarily to allow `--preview --ignore PREVIEW --extend-select
FOO001,BAR200`
- Using `--preview` enables preview rules that match selectors
Notable decisions:
- Preview rules are not selectable by their rule code without enabling
preview
- Retains the "NURSERY" selector for backwards compatibility
- Nursery rules are selectable by their rule code for backwards
compatiblity
Additional work:
- Selection of preview rules without the "--preview" flag should display
a warning
- Use of deprecated nursery selection behavior should display a warning
- Nursery selection should be removed after some time
## Test Plan
<!-- How was it tested? -->
Manual confirmation (i.e. we don't have an preview rules yet just
nursery rules so I added a preview rule for manual testing)
New unit tests
---------
Co-authored-by: Charlie Marsh <charlie.r.marsh@gmail.com>
## Summary
Add a configuration option to extend the list of names that can be
accessed without triggering SLF001.
Fixes issue #7018
## Test Plan
Manually tested by creating a python file (`test.py`):
```python
def foo(obj):
obj._meta
```
and a `ruff.toml` file:
```toml
select = ["SLF"]
[flake8-self]
extend-ignore-names = ["_meta"]
```
Then running `cargo run -p ruff_cli -- check test.py --no-cache` (once
with the `extend-ignore-names` line comment out) to see if the
configuration option works.
---------
Co-authored-by: Charlie Marsh <charlie.r.marsh@gmail.com>
Per discussion at https://github.com/astral-sh/ruff/discussions/6998
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## Summary
<!-- What's the purpose of the change? What does it do, and why? -->
Adds a `--preview` and `--no-preview` option to the CLI for `ruff check`
and corresponding settings. The CLI options are hidden for now.
Available in the settings as `preview = true` or `preview = false`.
Does not include environment variable configuration, although we may add
it in the future.
## Test Plan
<!-- How was it tested? -->
`cargo build`
Future work will build on this setting, such as toggling the mode during
a test.
