7572: Add `find_or_create_impl_block` to assist utils r=matklad a=yoshuawuyts
This is another continuation of https://github.com/rust-analyzer/rust-analyzer/pull/7562, introducing a small util to either find an `impl` block, or create a new one if none exists. I copied this code from the `generate_new` assist into https://github.com/rust-analyzer/rust-analyzer/pull/7562, and this unifies both into a helper.
It doesn't feel super polished in its current state, but my hope is that this is enough of a starting point that it can be expanded on later. For example something that would be useful would be a flag which either returns the index of the start of the block, or the end of the block.
Anyway, I hope this is useful. Thanks!
Co-authored-by: Yoshua Wuyts <yoshuawuyts@gmail.com>
7574: Remove various redundant clones r=kjeremy a=yoshuawuyts
I noticed when running clippy through RA that there are a few instances where `clone` is called where it's not actually needed. I figured a small patch to remove these might be welcome here.
Thanks!
Co-authored-by: Yoshua Wuyts <yoshuawuyts@gmail.com>
7505: Widen Highlights root range to covering element r=Veykril a=Veykril
There have been a few issues about/containing spurious syntax highlighting panics, which all seem to come from the `rust_analyzer::handlers::handle_semantic_tokens_range` request, which I believe this to be the cause of as the text range we want to highlight here is currently potentially smaller than that of the covering element, so we might highlight something that is inside the covering element, but outside of the text range we wish to highlight causing the assert to fail.
Unfortunately this isn't really easy to test since I have yet to find a reproducible cause(#7504 doesn't work for me cause I can't seem to checkout the given commit).
See #7504, #7298, #7299 and #7416, all of those contain an assertion failure in syntax highlighting, but only in the range request.
Co-authored-by: Lukas Wirth <lukastw97@gmail.com>
7570: Add doc gen to the `generate_enum_match_method` assist r=yoshuawuyts a=yoshuawuyts
Implements a small extension to https://github.com/rust-analyzer/rust-analyzer/pull/7562, generating default comments. I wasn't sure if this would fit the goals of Rust-Analyzer, so I chose to split it into a separate PR. This is especially useful when writing code in a codebase which uses `#![warn(missing_docs)]` lint, as many production-grade libraries do.
The comments we're generating here are similar to the ones found on [`Option::is_some`](https://doc.rust-lang.org/std/option/enum.Option.html#method.is_some) and [`Result::is_err`](https://doc.rust-lang.org/std/result/enum.Result.html#method.is_err). I briefly considered only generating these for `pub` types, but they seem small and unobtrusive enough that they're probably useful in the general case. Thanks!
## Example
__input__
```rust
pub(crate) enum Variant {
Undefined,
Minor, // cursor here
Major,
}
```
__output__
```rust
pub(crate) enum Variant {
Undefined,
Minor,
Major,
}
impl Variant {
/// Returns `true` if the variant is [`Minor`].
pub(crate) fn is_minor(&self) -> bool {
matches!(self, Self::Minor)
}
}
```
## Future Directions
This opens up the path to adding an assist for generating these comments on existing `is_` methods. This would make it both easy to document new code, and update existing code with documentation.
7571: Cleanup decl_check r=Veykril a=Veykril
bors r+
Co-authored-by: Yoshua Wuyts <yoshuawuyts@gmail.com>
Co-authored-by: Lukas Wirth <lukastw97@gmail.com>
7562: add `generate_enum_match` assist r=matklad a=yoshuawuyts
This adds a `generate_enum_match` assist, which generates `is_` variants for enums (e.g. `Option::{is_none,is_some}` in std). This is my first attempt at contributing to Rust-Analyzer, so I'm not sure if I've gotten everything right. Thanks!
## Example
**Input**
```rust
pub(crate) enum Variant {
Undefined,
Minor, // cursor here
Major,
}
```
**Output**
```rust
pub(crate) enum Variant {
Undefined,
Minor,
Major,
}
impl Variant {
pub(crate) fn is_minor(&self) -> bool {
matches!(self, Self::Minor)
}
}
```
## Future Directions
I made this as a stepping stone for some of the more involved refactors (e.g. #5944). I'm not sure yet how to create, use, and test `window.showQuickPick`-based asssists in RA. But once that's possible, it'd probably be nice to be able to generate match methods in bulk through the quickpick UI rather than one-by-one:
```
[x] Select enum members to generate methods for. (3 selected) [ OK ]
---------------------------------------------------------------------------
[x] Undefined
[x] Minor
[x] Major
```
Co-authored-by: Yoshua Wuyts <yoshuawuyts+github@gmail.com>
Co-authored-by: Yoshua Wuyts <yoshuawuyts@gmail.com>
7568: Fix merging of `segment_index` in path resolution r=jonas-schievink a=jonas-schievink
This caused associated item lookup to fail when modifying `resolver.rs` to handle block expressions with inner items.
bors r+
Co-authored-by: Jonas Schievink <jonasschievink@gmail.com>
7535: Extract function assist r=cpud36 a=cpud36
This PR adds `extract function/method` assist. closes#5409.
# Supported features
Assist should support extracting from expressions(`1`, `2 + 2`, `loop { }`) and from a series of statements, e.g.:
```rust
foo();
$0bar();
baz();$0
quix();
```
Assist also supports extracting parameters, like:
```rust
fn foo() -> i32 {
let n = 1;
$0n + 1$0
}
// -
fn foo() -> i32 {
let n = 1;
fun_name(n)
}
fn fun_name(n: i32) -> i32 {
n + 1
}
```
Extracting methods also generally works.
Assist allows referencing outer variables, both mutably and immutably, and handles handles access to variables local to extracted function:
```rust
fn foo() {
let mut n = 1;
let mut m = 2;
let mut moved_v = Vec::new();
let mut ref_mut_v = Vec::new();
$0
n += 1;
let k = 1;
moved_v.push(n);
let r = &mut m;
ref_mut_v.push(*r);
let h = 3;
$0
n = ref_mut_v.len() + k;
n -= h + m;
}
// -
fn foo() {
let mut n = 1;
let mut m = 2;
let mut moved_v = Vec::new();
let mut ref_mut_v = Vec::new();
let (k, h) = fun_name(&mut n, moved_v, &mut m, &mut ref_mut_v);
n = ref_mut_v.len() + k;
n -= h + m;
}
fn fun_name(n: &mut i32, mut moved_v: Vec<i32>, m: &mut i32, ref_mut_v: &mut Vec<i32>) -> (i32, i32) {
*n += 1;
let k = 1;
moved_v.push(*n);
let r = m;
ref_mut_v.push(*r);
let h = 3;
(k, h)
}
```
So we handle both input and output paramters
# Showcase
# Working with non-`Copy` types
Consider the following example:
```rust
fn foo() {
let v = Vec::new();
$0
let n = v.len();
$0
let is_empty = v.is_empty();
}
```
`v` must be a parameter to extracted function.
The question is, what type should it have.
It could be `v: Vec<i32>`, or `v: &Vec<i32>`.
The former is incorrect for `Vec<i32>`, but the later is silly for `i32`.
To resolve this we need to know if the type implements `Copy` trait.
I didn't find any api available from assists to query this.
`hir_ty::method_resolution::implements` seems relevant, but is isn't publicly re-exported from `hir`.
# Star(`*`) token and pointer dereference
If I understand correctly, in order to create expression like `*p`, one should use `ast::make::expr_prefix(T![*], ...)`, which
in turn calls `token(T![*])`.
`token` does not have star in `tokens::SOURCE_FILE`, so this panics.
I had to add `*` to `SOURCE_FILE` to make it work.
Correct me if this is not intended way to do this.
# Lowering access `value -> mut ref -> shared ref`
Consider the following example:
```rust
fn foo() {
let v = Vec::new();
$0 let n = v.len(); $0
}
```
`v` is not used after extracted function body, so both `v: &Vec<i32>` and `v: Vec<i32>` would work.
Currently the later would be chosen.
We can however check the body of extracted function and conclude that `v: &Vec<i32>` is sufficient.
Using `v: &Vec<i32>`(that is a minimal required access level) might be a better default.
I am unsure.
# Cleanup
The assist seems to be reasonably handling most of common cases.
If there are no concerns with code it produces(i.e. with test cases), I will start cleaning up
[edit]
added showcase
Co-authored-by: Vladyslav Katasonov <cpud47@gmail.com>
