Auto merge of rust-lang#13365 - feniljain:master, r=Veykril

feat: add multiple getters mode in `generate_getter`

This commit adds two modes to generate_getter action.
First, the plain old working on single fields.
Second, working on a selected range of fields.

Should partially solve rust-lang#13246
If this gets approved will create a separate PR for setters version of the same

### Points to help in review:

- `generate_getter_from_record_info` contains code which is mostly taken from assist before refactor
- Same goes for `parse_record_fields`
- There are changes in other assists, as one of the methods in utils named `find_struct_impl` is changed, before it used to accept a single `fn_name`, now it takes a list of function names to check against. All old impls are updated to create a small list to pass their single element.

### Assumptions:

- If any of the fields have an implementation, the action will quit.

Author: bors

crates/ide-assists/src/handlers/generate_delegate_methods.rs

@@ -51,14 +51,14 @@ pub(crate) fn generate_delegate_methods(acc: &mut Assists, ctx: &AssistContext<'
         Some(field) => {
             let field_name = field.name()?;
             let field_ty = field.ty()?;
-            (format!("{field_name}"), field_ty, field.syntax().text_range())
+            (field_name.to_string(), field_ty, field.syntax().text_range())
         }
         None => {
             let field = ctx.find_node_at_offset::<ast::TupleField>()?;
             let field_list = ctx.find_node_at_offset::<ast::TupleFieldList>()?;
             let field_list_index = field_list.fields().position(|it| it == field)?;
             let field_ty = field.ty()?;
-            (format!("{field_list_index}"), field_ty, field.syntax().text_range())
+            (field_list_index.to_string(), field_ty, field.syntax().text_range())
         }
     };
 
@@ -77,13 +77,11 @@ pub(crate) fn generate_delegate_methods(acc: &mut Assists, ctx: &AssistContext<'
     for method in methods {
         let adt = ast::Adt::Struct(strukt.clone());
         let name = method.name(ctx.db()).to_string();
-        let impl_def = find_struct_impl(ctx, &adt, &name).flatten();
-        let method_name = method.name(ctx.db());
-
+        let impl_def = find_struct_impl(ctx, &adt, &[name]).flatten();
         acc.add_group(
             &GroupLabel("Generate delegate methods…".to_owned()),
             AssistId("generate_delegate_methods", AssistKind::Generate),
-            format!("Generate delegate for `{field_name}.{method_name}()`"),
+            format!("Generate delegate for `{}.{}()`", field_name, method.name(ctx.db())),
             target,
             |builder| {
                 // Create the function
@@ -158,7 +156,7 @@ pub(crate) fn generate_delegate_methods(acc: &mut Assists, ctx: &AssistContext<'
                             }
                             None => {
                                 let offset = strukt.syntax().text_range().end();
-                                let snippet = format!("\n\n{impl_def}");
+                                let snippet = format!("\n\n{}", impl_def.syntax());
                                 builder.insert(offset, snippet);
                             }
                         }

crates/ide-assists/src/handlers/generate_enum_is_method.rs

@@ -52,7 +52,7 @@ pub(crate) fn generate_enum_is_method(acc: &mut Assists, ctx: &AssistContext<'_>
     let fn_name = format!("is_{}", &to_lower_snake_case(&variant_name.text()));
 
     // Return early if we've found an existing new fn
-    let impl_def = find_struct_impl(ctx, &parent_enum, &fn_name)?;
+    let impl_def = find_struct_impl(ctx, &parent_enum, &[fn_name.clone()])?;
 
     let target = variant.syntax().text_range();
     acc.add_group(

crates/ide-assists/src/handlers/generate_enum_projection_method.rs

@@ -147,7 +147,7 @@ fn generate_enum_projection_method(
     let fn_name = format!("{}_{}", fn_name_prefix, &to_lower_snake_case(&variant_name.text()));
 
     // Return early if we've found an existing new fn
-    let impl_def = find_struct_impl(ctx, &parent_enum, &fn_name)?;
+    let impl_def = find_struct_impl(ctx, &parent_enum, &[fn_name.clone()])?;
 
     let target = variant.syntax().text_range();
     acc.add_group(

crates/ide-assists/src/handlers/generate_function.rs

@@ -198,7 +198,7 @@ fn get_adt_source(
     let file = ctx.sema.parse(range.file_id);
     let adt_source =
         ctx.sema.find_node_at_offset_with_macros(file.syntax(), range.range.start())?;
-    find_struct_impl(ctx, &adt_source, fn_name).map(|impl_| (impl_, range.file_id))
+    find_struct_impl(ctx, &adt_source, &[fn_name.to_string()]).map(|impl_| (impl_, range.file_id))
 }
 
 struct FunctionTemplate {