Merge #7562

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 <[email protected]>
Co-authored-by: Yoshua Wuyts <[email protected]>

1 files changed, 27 insertions, 0 deletions

diff --git a/crates/assists/src/tests/generated.rs b/crates/assists/src/tests/generated.rs
index e84f208a3..960815bd9 100644
--- a/crates/assists/src/tests/generated.rs
+++ b/crates/assists/src/tests/generated.rs
@@ -460,6 +460,33 @@ struct Point {
 }
 
 #[test]
+fn doctest_generate_enum_match_method() {
+    check_doc_test(
+        "generate_enum_match_method",
+        r#####"
+enum Version {
+ Undefined,
+ Minor$0,
+ Major,
+}
+"#####,
+        r#####"
+enum Version {
+ Undefined,
+ Minor,
+ Major,
+}
+
+impl Version {
+    fn is_minor(&self) -> bool {
+        matches!(self, Self::Minor)
+    }
+}
+"#####,
+    )
+}
+
+#[test]
 fn doctest_generate_from_impl_for_enum() {
     check_doc_test(
         "generate_from_impl_for_enum",