internal: refactor incorrect case diagnostics

crates/hir/src/diagnostics.rs

@@ -34,6 +34,7 @@ macro_rules! diagnostics {
 diagnostics![
     BreakOutsideOfLoop,
     InactiveCode,
+    IncorrectCase,
     MacroError,
     MismatchedArgCount,
     MissingFields,
@@ -195,31 +196,3 @@ impl Diagnostic for InternalBailedOut {
 }
 
 pub use hir_ty::diagnostics::IncorrectCase;
-
-impl Diagnostic for IncorrectCase {
-    fn code(&self) -> DiagnosticCode {
-        DiagnosticCode("incorrect-ident-case")
-    }
-
-    fn message(&self) -> String {
-        format!(
-            "{} `{}` should have {} name, e.g. `{}`",
-            self.ident_type,
-            self.ident_text,
-            self.expected_case.to_string(),
-            self.suggested_text
-        )
-    }
-
-    fn display_source(&self) -> InFile<SyntaxNodePtr> {
-        InFile::new(self.file, self.ident.clone().into())
-    }
-
-    fn as_any(&self) -> &(dyn Any + Send + 'static) {
-        self
-    }
-
-    fn is_experimental(&self) -> bool {
-        true
-    }
-}

crates/hir/src/lib.rs

@@ -86,8 +86,8 @@ use crate::{
 pub use crate::{
     attrs::{HasAttrs, Namespace},
     diagnostics::{
-        AnyDiagnostic, BreakOutsideOfLoop, InactiveCode, InternalBailedOut, MacroError,
-        MismatchedArgCount, MissingFields, MissingMatchArms, MissingOkOrSomeInTailExpr,
+        AnyDiagnostic, BreakOutsideOfLoop, InactiveCode, IncorrectCase, InternalBailedOut,
+        MacroError, MismatchedArgCount, MissingFields, MissingMatchArms, MissingOkOrSomeInTailExpr,
         MissingUnsafe, NoSuchField, RemoveThisSemicolon, ReplaceFilterMapNextWithFindMap,
         UnimplementedBuiltinMacro, UnresolvedExternCrate, UnresolvedImport, UnresolvedMacroCall,
         UnresolvedModule, UnresolvedProcMacro,
@@ -340,7 +340,7 @@ impl ModuleDef {
         }
     }
 
-    pub fn diagnostics(self, db: &dyn HirDatabase, sink: &mut DiagnosticSink) {
+    pub fn diagnostics(self, db: &dyn HirDatabase) -> Vec<AnyDiagnostic> {
         let id = match self {
             ModuleDef::Adt(it) => match it {
                 Adt::Struct(it) => it.id.into(),
@@ -353,17 +353,19 @@ impl ModuleDef {
             ModuleDef::Module(it) => it.id.into(),
             ModuleDef::Const(it) => it.id.into(),
             ModuleDef::Static(it) => it.id.into(),
-            _ => return,
+            _ => return Vec::new(),
         };
 
         let module = match self.module(db) {
             Some(it) => it,
-            None => return,
+            None => return Vec::new(),
         };
 
+        let mut acc = Vec::new();
         for diag in hir_ty::diagnostics::validate_module_item(db, module.id.krate(), id) {
-            sink.push(diag)
+            acc.push(diag.into())
         }
+        acc
     }
 }
 
@@ -624,7 +626,7 @@ impl Module {
                         acc.extend(m.diagnostics(db, sink, internal_diagnostics))
                     }
                 }
-                _ => decl.diagnostics(db, sink),
+                _ => acc.extend(decl.diagnostics(db)),
             }
         }
 
@@ -1234,7 +1236,7 @@ impl Function {
         }
 
         for diag in hir_ty::diagnostics::validate_module_item(db, krate, self.id.into()) {
-            sink.push(diag)
+            acc.push(diag.into())
         }
         acc
     }

crates/hir_ty/src/diagnostics.rs

@@ -84,9 +84,6 @@ impl fmt::Display for IdentType {
     }
 }
 
-// Diagnostic: incorrect-ident-case
-//
-// This diagnostic is triggered if an item name doesn't follow https://doc.rust-lang.org/1.0.0/style/style/naming/README.html[Rust naming convention].
 #[derive(Debug)]
 pub struct IncorrectCase {
     pub file: HirFileId,

crates/ide/src/diagnostics.rs

@@ -6,6 +6,7 @@
 
 mod break_outside_of_loop;
 mod inactive_code;
+mod incorrect_case;
 mod macro_error;
 mod mismatched_arg_count;
 mod missing_fields;
@@ -135,7 +136,6 @@ pub struct DiagnosticsConfig {
 struct DiagnosticsContext<'a> {
     config: &'a DiagnosticsConfig,
     sema: Semantics<'a, RootDatabase>,
-    #[allow(unused)]
     resolve: &'a AssistResolveStrategy,
 }
 
@@ -165,9 +165,6 @@ pub(crate) fn diagnostics(
     }
     let res = RefCell::new(res);
     let sink_builder = DiagnosticSinkBuilder::new()
-        .on::<hir::diagnostics::IncorrectCase, _>(|d| {
-            res.borrow_mut().push(warning_with_fix(d, &sema, resolve));
-        })
         .on::<UnlinkedFile, _>(|d| {
             // Limit diagnostic to the first few characters in the file. This matches how VS Code
             // renders it with the full span, but on other editors, and is less invasive.
@@ -216,6 +213,7 @@ pub(crate) fn diagnostics(
         #[rustfmt::skip]
         let d = match diag {
             AnyDiagnostic::BreakOutsideOfLoop(d) => break_outside_of_loop::break_outside_of_loop(&ctx, &d),
+            AnyDiagnostic::IncorrectCase(d) => incorrect_case::incorrect_case(&ctx, &d),
             AnyDiagnostic::MacroError(d) => macro_error::macro_error(&ctx, &d),
             AnyDiagnostic::MismatchedArgCount(d) => mismatched_arg_count::mismatched_arg_count(&ctx, &d),
             AnyDiagnostic::MissingFields(d) => missing_fields::missing_fields(&ctx, &d),
@@ -250,16 +248,6 @@ pub(crate) fn diagnostics(
     res
 }
 
-fn warning_with_fix<D: DiagnosticWithFixes>(
-    d: &D,
-    sema: &Semantics<RootDatabase>,
-    resolve: &AssistResolveStrategy,
-) -> Diagnostic {
-    Diagnostic::hint(sema.diagnostics_display_range(d.display_source()).range, d.message())
-        .with_fixes(d.fixes(sema, resolve))
-        .with_code(Some(d.code()))
-}
-
 fn check_unnecessary_braces_in_use_statement(
     acc: &mut Vec<Diagnostic>,
     file_id: FileId,

crates/ide/src/diagnostics/fixes.rs

@@ -1,6 +1,5 @@
 //! Provides a way to attach fixes to the diagnostics.
 //! The same module also has all curret custom fixes for the diagnostics implemented.
-mod change_case;
 
 use hir::{diagnostics::Diagnostic, Semantics};
 use ide_assists::AssistResolveStrategy;

crates/ide/src/diagnostics/incorrect_case.rs

@@ -1,35 +1,46 @@
-use hir::{db::AstDatabase, diagnostics::IncorrectCase, InFile, Semantics};
-use ide_assists::{Assist, AssistResolveStrategy};
-use ide_db::{base_db::FilePosition, RootDatabase};
+use hir::{db::AstDatabase, InFile};
+use ide_assists::Assist;
+use ide_db::base_db::FilePosition;
 use syntax::AstNode;
 
 use crate::{
-    diagnostics::{unresolved_fix, DiagnosticWithFixes},
+    diagnostics::{unresolved_fix, Diagnostic, DiagnosticsContext},
     references::rename::rename_with_semantics,
+    Severity,
 };
 
-impl DiagnosticWithFixes for IncorrectCase {
-    fn fixes(
-        &self,
-        sema: &Semantics<RootDatabase>,
-        resolve: &AssistResolveStrategy,
-    ) -> Option<Vec<Assist>> {
-        let root = sema.db.parse_or_expand(self.file)?;
-        let name_node = self.ident.to_node(&root);
+// Diagnostic: incorrect-ident-case
+//
+// This diagnostic is triggered if an item name doesn't follow https://doc.rust-lang.org/1.0.0/style/style/naming/README.html[Rust naming convention].
+pub(super) fn incorrect_case(ctx: &DiagnosticsContext<'_>, d: &hir::IncorrectCase) -> Diagnostic {
+    Diagnostic::new(
+        "incorrect-ident-case",
+        format!(
+            "{} `{}` should have {} name, e.g. `{}`",
+            d.ident_type, d.ident_text, d.expected_case, d.suggested_text
+        ),
+        ctx.sema.diagnostics_display_range(InFile::new(d.file, d.ident.clone().into())).range,
+    )
+    .severity(Severity::WeakWarning)
+    .with_fixes(fixes(ctx, d))
+}
 
-        let name_node = InFile::new(self.file, name_node.syntax());
-        let frange = name_node.original_file_range(sema.db);
-        let file_position = FilePosition { file_id: frange.file_id, offset: frange.range.start() };
+fn fixes(ctx: &DiagnosticsContext<'_>, d: &hir::IncorrectCase) -> Option<Vec<Assist>> {
+    let root = ctx.sema.db.parse_or_expand(d.file)?;
+    let name_node = d.ident.to_node(&root);
 
-        let label = format!("Rename to {}", self.suggested_text);
-        let mut res = unresolved_fix("change_case", &label, frange.range);
-        if resolve.should_resolve(&res.id) {
-            let source_change = rename_with_semantics(sema, file_position, &self.suggested_text);
-            res.source_change = Some(source_change.ok().unwrap_or_default());
-        }
+    let name_node = InFile::new(d.file, name_node.syntax());
+    let frange = name_node.original_file_range(ctx.sema.db);
+    let file_position = FilePosition { file_id: frange.file_id, offset: frange.range.start() };
 
-        Some(vec![res])
+    let label = format!("Rename to {}", d.suggested_text);
+    let mut res = unresolved_fix("change_case", &label, frange.range);
+    if ctx.resolve.should_resolve(&res.id) {
+        let source_change = rename_with_semantics(&ctx.sema, file_position, &d.suggested_text);
+        res.source_change = Some(source_change.ok().unwrap_or_default());
     }
+
+    Some(vec![res])
 }
 
 #[cfg(test)]