add --fix support to `cargo-clippy`
Prior to this we had started work on integrating clippy as a subcommand directly into cargo in the form of `cargo clippy-preview` and `cargo fix --clippy`. In the course of that work it was decided that the best approach would be to strictly add the features clippy needed to cargo in order to insert `clippy-driver` only for workspace crates. This was accomplished by adding a `RUSTC_WORKSPACE_WRAPPER` env variable to cargo that will override the normal `RUSTC_WRAPPER` when both are present and the current crate is a workspace crate.
This change adds support to clippy to use this by setting the `RUSTC_WORKSPACE_WRAPPER` env variable instead `RUSTC_WRAPPER` and by detecting `--fix` as an arg and swapping out the `check` cargo command for `fix` when it is present.
WIP, here are the current issues that I still need to resolve
- [x] Detect if we're running on nightly rust
- [x] Set `RUSTC_WORKSPACE_WRAPPER` on nightly, and `RUSTC_WRAPPER` on stable
- [x] Error out on stable when `--fix` is specified, because stable currently hasn't landed the PR for `RUSTC_WORKSPACE_WRAPPER` so if we set this it just runs check and silently fails
- [ ] Update the help text
- [ ] The current plan is to shell out to `cargo check --help` and then postprocess the output to mention clippy instead of check where appropriate and to add the extra info about `--fix` and the `-- -A lint` options.
- [x] tests?
changelog: add `--fix` arg to `cargo-clippy`
large_enum_variant: Report sizes of variants
This reports the sizes of the largest and second-largest variants.
Closes#5459
changelog: `large_enum_variant`: Report the sizes of the largest and second-largest variants.
Disallow bit-shifting in integer_arithmetic
Make the `integer_arithmetic` lint detect all the operations that are defined as being capable of overflow in the [Rust Reference](https://doc.rust-lang.org/reference/expressions/operator-expr.html#overflow), by also linting for bit-shifting operations (`<<`, `>>`).
changelog: Disallow bit-shifting in `integer_arithmetic`
Add lint on large non scalar const
This PR adds the new lint `non_scalar_const` that aims to warn against `const` declaration of large arrays. For performance, because of inlining, large arrays should be preferably declared as `static`.
Note: i made this one to warn on all const arrays, whether they are in a body function or not. I don't know if this is really necessary, i could just reduce this lint to variables out of function scope.
Fixes: #400
changelog: add new lint for large non-scalar types declared as const
Add lint for explicit deref and deref_mut method calls
This PR adds the lint `explicit_deref_method` that suggests replacing `deref()` and `deref_mut()` with `&*a` and `&mut *a`.
It doesn't lint inside macros.
This PR is the continuation of #3258.
changelog: Add lint `explicit_deref_method`.
Fixes: #1566
Add lint for float in array comparison
Fixes#4277
changelog:
- Added new handler for expression of index kind (e.g. `arr[i]`). It returns a constant when both array and index are constant, or when the array is constant and all values are equal.
- Trigger float_cmp and float_cmp_const lint when comparing arrays. Allow for comparison when one of the arrays contains only zeros or infinities.
- Added appropriate tests for such cases.
Refactor: Use rustc's `match_def_path`
This replaces our match_def_path implementation with the rustc one.
Note that we can't just use it in all call sites because of the
`&[&str]` / `&[Symbol]` difference in Clippy/rustc.
changelog: none
This replaces our match_def_path implementation with the rustc one.
Note that we can't just use it in all call sites because of the
`&[&str]` / `&[Symbol]` difference in Clippy/rustc.
Make use of more diagnostic items
This makes use of some (not all) already existing diagnostic items. Specifically:
* 79982a2: `core::mem::uninitialized`, `core::mem::zeroed`, `alloc::sync::Arc`, `alloc::sync::Rc`
* 83874d0: `Option` and `Result`
cc #5393
changelog: none
Fixes#5405: redundant clone false positive with arrays
Check whether slice elements implement Copy before suggesting to drop
the clone method
changelog: add a check for slice indexing on redundant_clone lint
Update documentation for new_ret_no_self
changelog: Update documentation for lint new_ret_no_self to reflect that the return type must only contain `Self`, not be `Self`
The lint was changed to be more lenient than the documentation implies in PR #3338 (Related issue #3313)
