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This documents is an index of features that rust-analyzer language server provides.
### Go to symbol in workspace <kbd>ctrl+t</kbd>
It mostly works on top of the built-in LSP functionality, however `#` and `*`
symbols can be used to narrow down the search. Specifically,
- `#Foo` searches for `Foo` type in the current workspace
- `#foo#` searches for `foo` function in the current workspace
- `#Foo*` searches for `Foo` type among dependencies, excluding `stdlib`
- `#foo#*` searches for `foo` function among dependencies.
That is, `#` switches from "types" to all symbols, `*` switches from the current
workspace to dependencies.
### Commands <kbd>ctrl+shift+p</kbd>
#### Show Rust Syntax Tree
Shows the parse tree of the current file. It exists mostly for debugging
rust-analyzer itself.
#### Extend Selection
Extends the current selection to the encompassing syntactic construct
(expression, statement, item, module, etc). It works with multiple cursors. Do
bind this command to a key, its super-useful! Expected to be upstreamed to LSP soonish:
https://github.com/Microsoft/language-server-protocol/issues/613
#### Matching Brace
If the cursor is on any brace (`<>(){}[]`) which is a part of a brace-pair,
moves cursor to the matching brace. It uses the actual parser to determine
braces, so it won't confuse generics with comparisons.
#### Parent Module
Navigates to the parent module of the current module.
#### Join Lines
Join selected lines into one, smartly fixing up whitespace and trailing commas.
#### Run
Shows popup suggesting to run a test/benchmark/binary **at the current cursor
location**. Super useful for repeatedly running just a single test. Do bind this
to a shortcut!
### On Typing Assists
Some features trigger on typing certain characters:
- typing `let =` tries to smartly add `;` if `=` is followed by an existing expression.
- Enter inside comments automatically inserts `///`
- typing `.` in a chain method call auto-indents
### Code Actions (Assists)
These are triggered in a particular context via light bulb. We use custom code on
the VS Code side to be able to position cursor.
- Flip `,`
```rust
// before:
fn foo(x: usize,<|> dim: (usize, usize))
// after:
fn foo(dim: (usize, usize), x: usize)
```
- Add `#[derive]`
```rust
// before:
struct Foo {
<|>x: i32
}
// after:
#[derive(<|>)]
struct Foo {
x: i32
}
```
- Add `impl`
```rust
// before:
struct Foo<'a, T: Debug> {
<|>t: T
}
// after:
struct Foo<'a, T: Debug> {
t: T
}
impl<'a, T: Debug> Foo<'a, T> {
<|>
}
```
- Change visibility
```rust
// before:
fn<|> foo() {}
// after
pub(crate) fn foo() {}
```
- Introduce variable:
```rust
// before:
fn foo() {
foo(<|>1 + 1<|>);
}
// after:
fn foo() {
let var_name = 1 + 1;
foo(var_name);
}
```
- Replace if-let with match:
```rust
// before:
impl VariantData {
pub fn is_struct(&self) -> bool {
if <|>let VariantData::Struct(..) = *self {
true
} else {
false
}
}
}
// after:
impl VariantData {
pub fn is_struct(&self) -> bool {
<|>match *self {
VariantData::Struct(..) => true,
_ => false,
}
}
}
```
- Split import
```rust
// before:
use algo:<|>:visitor::{Visitor, visit};
//after:
use algo::{<|>visitor::{Visitor, visit}};
```
|
