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.
## Summary
This PR adds comment handling for comments between the `=` and the
`value` for keywords, as in the following cases:
```python
func(
x # dangling
= # dangling
# dangling
1,
** # dangling
y
)
```
(Comments after the `**` were already handled in some cases, but I've
unified the handling with the `=` handling.)
Note that, previously, comments between the `**` and its value were
rendered as trailing comments on the value (so they'd appear after `y`).
This struck me as odd since it effectively re-ordered the comment with
respect to its closest AST node (the value). I've made them leading
comments, though I don't know that that's a significant improvement. I
could also imagine us leaving them where they are.
## Summary
Attempt at a small improvement to two `perflint` rules using the new
type inference capabilities to only flag `PERF401` and `PERF402` for
values we infer to be lists. This makes the rule more conservative, as
it only flags values that we _know_ to be lists, but it's overall a
desirable change, as it favors false negatives over false positives for
a "nice-to-have" rule.
Closes https://github.com/astral-sh/ruff/issues/6995.
## Test Plan
Add non-list value cases and make sure all old cases are still caught.
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## Summary
Rewriting the `if`-comparison to focus on the meaning of rule ` assert
S101`.
Fixes#6984
## Test Plan
<!-- How was it tested? -->
---------
Co-authored-by: Zanie Blue <contact@zanie.dev>
## Summary
Ensures that we use the same error types and messages. Also renames
those struct to `FormatCommand*` for consistency, and removes the
`FormatCommandResult::Skipped` variant in favor of skipping in the
iterator directly.
## Summary
Returns an exit code of 1 if any files would be reformatted:
```
ruff on charlie/format-check:main [$?⇡] is 📦 v0.0.286 via 🐍 v3.11.2 via 🦀 v1.72.0
❯ cargo run -p ruff_cli -- format foo.py --check
Compiling ruff_cli v0.0.286 (/Users/crmarsh/workspace/ruff/crates/ruff_cli)
Finished dev [unoptimized + debuginfo] target(s) in 1.69s
Running `target/debug/ruff format foo.py --check`
warning: `ruff format` is a work-in-progress, subject to change at any time, and intended only for experimentation.
1 file would be reformatted
ruff on charlie/format-check:main [$?⇡] is 📦 v0.0.286 via 🐍 v3.11.2 via 🦀 v1.72.0 took 2s
❯ echo $?
1
```
Closes#6966.
## Summary
This is similar to `commands::check` vs. `commands::check_stdin`, and
gets the logic out of the parent file (`lib.rs`). It also ensures that
we avoid formatting files that should be excluded when `--force-exclude`
is provided.
## Summary
This PR adds a new helper method on the `Cursor` called `eat_char2`
which is similar to `eat_char` but accepts 2 characters instead of 1. It'll
`bump` the cursor twice if both characters are found on lookahead.
## Test Plan
`cargo test`
- Use `Option` instead of `Result` everywhere.
- Use `field` instead of `property` (to match the nomenclature of
`NamedTuple` and `TypedDict`).
- Put the violation function at the top of the file, rather than the
bottom.
## Summary
The `typename` argument to `NamedTuple` and `TypedDict` is a required
positional argument. We assumed as much, but panicked if it was provided
as a keyword argument or otherwise omitted. This PR handles the case
gracefully.
Closes https://github.com/astral-sh/ruff/issues/6953.
## Summary
As a small quality-of-life improvement, the locator can now slice like
`locator.slice(stmt)` instead of requiring
`locator.slice(stmt.range())`.
## Test Plan
`cargo test`
## Summary
This PR adds a higher-level enum (`SourceType`) around `PySourceType` to
allow us to use the same detection path to handle TOML files. Right now,
we have ad hoc `is_pyproject_toml` checks littered around, and some
codepaths are omitting that logic altogether (like `add_noqa`). Instead,
we should always be required to check the source type and handle TOML
files as appropriate.
This PR will also help with our pre-commit capabilities. If we add
`toml` to pre-commit (to support `pyproject.toml`), pre-commit will
start to pass _other_ files to Ruff (along with `poetry.lock` and
`Pipfile` -- see
[identify](b59996304f/identify/extensions.py (L355))).
By detecting those files and handling those cases, we avoid attempting
to parse them as Python files, which would lead to pre-commit errors.
(We tried to add `toml` to pre-commit here
(https://github.com/astral-sh/ruff-pre-commit/pull/44), but had to
revert here (https://github.com/astral-sh/ruff-pre-commit/pull/45) as it
led to the pre-commit hook attempting to parse `poetry.lock` files as
Python files.)
## Summary
This PR fixes a bug which sends the lexer into infinite loop for an invalid input.
The code in question is `[1` where the nesting is never finished. This means
that the lexer will keep emitting the `Err` token forever.
## Test Plan
Add a test case which collects all the tokens from the lexer. This just
makes sure that it doesn't go into infinite loop.
Zanie
magic-akari
Micha Reiser
Charlie Marsh
Chris Pryer
Victor Hugo Gomes
qdegraaf
Anselm Hahn
Dhruv Manilawala
Valeriy Savchenko
Jelle van der Waa