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# LSP Extensions
This document describes LSP extensions used by rust-analyzer.
It's a best effort document, when in doubt, consult the source (and send a PR with clarification ;-) ).
We aim to upstream all non Rust-specific extensions to the protocol, but this is not a top priority.
All capabilities are enabled via `experimental` field of `ClientCapabilities`.
## `SnippetTextEdit`
**Client Capability:** `{ "snippetTextEdit": boolean }`
If this capability is set, `WorkspaceEdit`s returned from `codeAction` requests might contain `SnippetTextEdit`s instead of usual `TextEdit`s:
```typescript
interface SnippetTextEdit extends TextEdit {
insertTextFormat?: InsertTextFormat;
}
```
```typescript
export interface TextDocumentEdit {
textDocument: VersionedTextDocumentIdentifier;
edits: (TextEdit | SnippetTextEdit)[];
}
```
When applying such code action, the editor should insert snippet, with tab stops and placeholder.
At the moment, rust-analyzer guarantees that only a single edit will have `InsertTextFormat.Snippet`.
### Example
"Add `derive`" code action transforms `struct S;` into `#[derive($0)] struct S;`
### Unresolved Questions
* Where exactly are `SnippetTextEdit`s allowed (only in code actions at the moment)?
* Can snippets span multiple files (so far, no)?
## `joinLines`
**Server Capability:** `{ "joinLines": boolean }`
This request is send from client to server to handle "Join Lines" editor action.
**Method:** `experimental/JoinLines`
**Request:**
```typescript
interface JoinLinesParams {
textDocument: TextDocumentIdentifier,
/// Currently active selections/cursor offsets.
/// This is an array to support multiple cursors.
ranges: Range[],
}
```
**Response:**
```typescript
TextEdit[]
```
### Example
```rust
fn main() {
/*cursor here*/let x = {
92
};
}
```
`experimental/joinLines` yields (curly braces are automagiacally removed)
```rust
fn main() {
let x = 92;
}
```
### Unresolved Question
* What is the position of the cursor after `joinLines`?
Currently this is left to editor's discretion, but it might be useful to specify on the server via snippets.
However, it then becomes unclear how it works with multi cursor.
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