Mark RUF005 as fixable

README.md

@@ -1422,7 +1422,7 @@ For more, see [flake8-self](https://pypi.org/project/flake8-self/) on PyPI.
 | RUF002 | ambiguous-unicode-character-docstring | Docstring contains ambiguous unicode character '{confusable}' (did you mean '{representant}'?) | 🛠 |
 | RUF003 | ambiguous-unicode-character-comment | Comment contains ambiguous unicode character '{confusable}' (did you mean '{representant}'?) | 🛠 |
 | RUF004 | keyword-argument-before-star-argument | Keyword argument `{name}` must come after starred arguments |  |
-| RUF005 | unpack-instead-of-concatenating-to-collection-literal | Consider `{expr}` instead of concatenation |  |
+| RUF005 | unpack-instead-of-concatenating-to-collection-literal | Consider `{expr}` instead of concatenation | 🛠 |
 | RUF100 | unused-noqa | Unused blanket `noqa` directive | 🛠 |
 
 <!-- End auto-generated sections. -->

crates/ruff/src/rules/ruff/rules/unpack_instead_of_concatenating_to_collection_literal.rs

@@ -6,19 +6,36 @@ use crate::ast::types::Range;
 use crate::checkers::ast::Checker;
 use crate::fix::Fix;
 use crate::registry::Diagnostic;
-use crate::violation::Violation;
+use crate::violation::{Availability, Violation};
+use crate::AutofixKind;
 
 define_violation!(
     pub struct UnpackInsteadOfConcatenatingToCollectionLiteral {
         pub expr: String,
+        pub fixable: bool,
     }
 );
 impl Violation for UnpackInsteadOfConcatenatingToCollectionLiteral {
+    const AUTOFIX: Option<AutofixKind> = Some(AutofixKind::new(Availability::Sometimes));
+
     #[derive_message_formats]
     fn message(&self) -> String {
-        let UnpackInsteadOfConcatenatingToCollectionLiteral { expr } = self;
+        let UnpackInsteadOfConcatenatingToCollectionLiteral { expr, .. } = self;
         format!("Consider `{expr}` instead of concatenation")
     }
+
+    fn autofix_title_formatter(&self) -> Option<fn(&Self) -> String> {
+        let UnpackInsteadOfConcatenatingToCollectionLiteral { fixable, .. } = self;
+        if *fixable {
+            Some(
+                |UnpackInsteadOfConcatenatingToCollectionLiteral { expr, .. }| {
+                    format!("Replace with `{expr}`")
+                },
+            )
+        } else {
+            None
+        }
+    }
 }
 
 fn make_splat_elts(
@@ -86,24 +103,24 @@ pub fn unpack_instead_of_concatenating_to_collection_literal(checker: &mut Check
         }),
     };
 
-    let mut new_expr_string = unparse_expr(&new_expr, checker.stylist);
-
-    new_expr_string = match kind {
+    let contents = match kind {
         // Wrap the new expression in parentheses if it was a tuple
-        Kind::Tuple => format!("({new_expr_string})"),
-        Kind::List => new_expr_string,
+        Kind::Tuple => format!("({})", unparse_expr(&new_expr, checker.stylist)),
+        Kind::List => unparse_expr(&new_expr, checker.stylist),
     };
+    let fixable = !has_comments(expr, checker.locator);
 
     let mut diagnostic = Diagnostic::new(
         UnpackInsteadOfConcatenatingToCollectionLiteral {
-            expr: new_expr_string.clone(),
+            expr: contents.clone(),
+            fixable,
         },
         Range::from_located(expr),
     );
     if checker.patch(diagnostic.kind.rule()) {
-        if !has_comments(expr, checker.locator) {
+        if fixable {
             diagnostic.amend(Fix::replacement(
-                new_expr_string,
+                contents,
                 expr.location,
                 expr.end_location.unwrap(),
             ));

crates/ruff/src/rules/ruff/snapshots/ruff__rules__ruff__tests__RUF005_RUF005.py.snap

@@ -1,10 +1,11 @@
 ---
-source: src/rules/ruff/mod.rs
+source: crates/ruff/src/rules/ruff/mod.rs
 expression: diagnostics
 ---
 - kind:
     UnpackInsteadOfConcatenatingToCollectionLiteral:
       expr: "[1, 2, 3, *foo]"
+      fixable: true
   location:
     row: 10
     column: 6
@@ -24,6 +25,7 @@ expression: diagnostics
 - kind:
     UnpackInsteadOfConcatenatingToCollectionLiteral:
       expr: "(7, 8, 9, *zoob)"
+      fixable: true
   location:
     row: 12
     column: 7
@@ -43,6 +45,7 @@ expression: diagnostics
 - kind:
     UnpackInsteadOfConcatenatingToCollectionLiteral:
       expr: "(*quux, 10, 11, 12)"
+      fixable: true
   location:
     row: 13
     column: 7
@@ -62,6 +65,7 @@ expression: diagnostics
 - kind:
     UnpackInsteadOfConcatenatingToCollectionLiteral:
       expr: "[*spom, 13, 14, 15]"
+      fixable: true
   location:
     row: 15
     column: 7
@@ -81,6 +85,7 @@ expression: diagnostics
 - kind:
     UnpackInsteadOfConcatenatingToCollectionLiteral:
       expr: "(\"we all say\", *yay())"
+      fixable: true
   location:
     row: 16
     column: 12
@@ -100,6 +105,7 @@ expression: diagnostics
 - kind:
     UnpackInsteadOfConcatenatingToCollectionLiteral:
       expr: "(\"we all think\", *Fun().yay())"
+      fixable: true
   location:
     row: 17
     column: 13
@@ -119,6 +125,7 @@ expression: diagnostics
 - kind:
     UnpackInsteadOfConcatenatingToCollectionLiteral:
       expr: "(\"we all feel\", *Fun.words)"
+      fixable: true
   location:
     row: 18
     column: 15
@@ -138,6 +145,7 @@ expression: diagnostics
 - kind:
     UnpackInsteadOfConcatenatingToCollectionLiteral:
       expr: "[\"a\", \"b\", \"c\", *eggs]"
+      fixable: true
   location:
     row: 20
     column: 8
@@ -157,6 +165,7 @@ expression: diagnostics
 - kind:
     UnpackInsteadOfConcatenatingToCollectionLiteral:
       expr: "(\"yes\", \"no\", \"pants\", *zoob)"
+      fixable: true
   location:
     row: 20
     column: 38
@@ -176,6 +185,7 @@ expression: diagnostics
 - kind:
     UnpackInsteadOfConcatenatingToCollectionLiteral:
       expr: "(*zoob,)"
+      fixable: true
   location:
     row: 22
     column: 6
@@ -195,6 +205,7 @@ expression: diagnostics
 - kind:
     UnpackInsteadOfConcatenatingToCollectionLiteral:
       expr: "[*first, 4, 5, 6]"
+      fixable: false
   location:
     row: 32
     column: 9
@@ -206,6 +217,7 @@ expression: diagnostics
 - kind:
     UnpackInsteadOfConcatenatingToCollectionLiteral:
       expr: "[*foo]"
+      fixable: true
   location:
     row: 41
     column: 0
@@ -225,6 +237,7 @@ expression: diagnostics
 - kind:
     UnpackInsteadOfConcatenatingToCollectionLiteral:
       expr: "[*foo]"
+      fixable: true
   location:
     row: 44
     column: 0