fix: don't include r# prefix in filesystem changes

crates/ide-db/src/rename.rs

@@ -190,6 +190,7 @@ fn rename_mod(
 
     let InFile { file_id, value: def_source } = module.definition_source(sema.db);
     if let ModuleSource::SourceFile(..) = def_source {
+        let new_name = new_name.trim_start_matches("r#");
         let anchor = file_id.original_file(sema.db);
 
         let is_mod_rs = module.is_mod_rs(sema.db);
@@ -207,9 +208,13 @@ fn rename_mod(
         //  - Module has submodules defined in separate files
         let dir_paths = match (is_mod_rs, has_detached_child, module.name(sema.db)) {
             // Go up one level since the anchor is inside the dir we're trying to rename
-            (true, _, Some(mod_name)) => Some((format!("../{mod_name}"), format!("../{new_name}"))),
+            (true, _, Some(mod_name)) => {
+                Some((format!("../{}", mod_name.unescaped()), format!("../{new_name}")))
+            }
             // The anchor is on the same level as target dir
-            (false, true, Some(mod_name)) => Some((mod_name.to_string(), new_name.to_string())),
+            (false, true, Some(mod_name)) => {
+                Some((mod_name.unescaped().to_string(), new_name.to_string()))
+            }
             _ => None,
         };
 

crates/ide/src/rename.rs

@@ -13,7 +13,7 @@
 };
 use itertools::Itertools;
 use stdx::{always, never};
-use syntax::{ast, AstNode, SyntaxNode, TextRange, TextSize};
+use syntax::{ast, utils::is_raw_identifier, AstNode, SmolStr, SyntaxNode, TextRange, TextSize};
 
 use text_edit::TextEdit;
 
@@ -122,7 +122,11 @@ pub(crate) fn will_rename_file(
     let sema = Semantics::new(db);
     let module = sema.to_module_def(file_id)?;
     let def = Definition::Module(module);
-    let mut change = def.rename(&sema, new_name_stem).ok()?;
+    let mut change = if is_raw_identifier(new_name_stem) {
+        def.rename(&sema, &SmolStr::from_iter(["r#", new_name_stem])).ok()?
+    } else {
+        def.rename(&sema, new_name_stem).ok()?
+    };
     change.file_system_edits.clear();
     Some(change)
 }
@@ -1286,6 +1290,143 @@ fn foo() {}
         )
     }
 
+    #[test]
+    fn test_rename_mod_to_raw_ident() {
+        check_expect(
+            "r#fn",
+            r#"
+//- /lib.rs
+mod foo$0;
+
+fn main() { foo::bar::baz(); }
+
+//- /foo.rs
+pub mod bar;
+
+//- /foo/bar.rs
+pub fn baz() {}
+"#,
+            expect![[r#"
+                SourceChange {
+                    source_file_edits: {
+                        FileId(
+                            0,
+                        ): TextEdit {
+                            indels: [
+                                Indel {
+                                    insert: "r#fn",
+                                    delete: 4..7,
+                                },
+                                Indel {
+                                    insert: "r#fn",
+                                    delete: 22..25,
+                                },
+                            ],
+                        },
+                    },
+                    file_system_edits: [
+                        MoveFile {
+                            src: FileId(
+                                1,
+                            ),
+                            dst: AnchoredPathBuf {
+                                anchor: FileId(
+                                    1,
+                                ),
+                                path: "fn.rs",
+                            },
+                        },
+                        MoveDir {
+                            src: AnchoredPathBuf {
+                                anchor: FileId(
+                                    1,
+                                ),
+                                path: "foo",
+                            },
+                            src_id: FileId(
+                                1,
+                            ),
+                            dst: AnchoredPathBuf {
+                                anchor: FileId(
+                                    1,
+                                ),
+                                path: "fn",
+                            },
+                        },
+                    ],
+                    is_snippet: false,
+                }
+            "#]],
+        );
+    }
+
+    #[test]
+    fn test_rename_mod_from_raw_ident() {
+        // FIXME: `r#fn` in path expression is not renamed.
+        check_expect(
+            "foo",
+            r#"
+//- /lib.rs
+mod r#fn$0;
+
+fn main() { r#fn::bar::baz(); }
+
+//- /fn.rs
+pub mod bar;
+
+//- /fn/bar.rs
+pub fn baz() {}
+"#,
+            expect![[r#"
+                SourceChange {
+                    source_file_edits: {
+                        FileId(
+                            0,
+                        ): TextEdit {
+                            indels: [
+                                Indel {
+                                    insert: "foo",
+                                    delete: 4..8,
+                                },
+                            ],
+                        },
+                    },
+                    file_system_edits: [
+                        MoveFile {
+                            src: FileId(
+                                1,
+                            ),
+                            dst: AnchoredPathBuf {
+                                anchor: FileId(
+                                    1,
+                                ),
+                                path: "foo.rs",
+                            },
+                        },
+                        MoveDir {
+                            src: AnchoredPathBuf {
+                                anchor: FileId(
+                                    1,
+                                ),
+                                path: "fn",
+                            },
+                            src_id: FileId(
+                                1,
+                            ),
+                            dst: AnchoredPathBuf {
+                                anchor: FileId(
+                                    1,
+                                ),
+                                path: "foo",
+                            },
+                        },
+                    ],
+                    is_snippet: false,
+                }
+            "#]],
+        );
+    }
+
     #[test]
     fn test_enum_variant_from_module_1() {
         cov_mark::check!(rename_non_local);