Map our diagnostics to rustc and clippy's ones

crates/hir-ty/src/diagnostics.rs

@@ -5,7 +5,7 @@ mod unsafe_check;
 mod decl_check;
 
 pub use crate::diagnostics::{
-    decl_check::{incorrect_case, IncorrectCase},
+    decl_check::{incorrect_case, CaseType, IncorrectCase},
     expr::{
         record_literal_missing_fields, record_pattern_missing_fields, BodyValidationDiagnostic,
     },

crates/hir-ty/src/diagnostics/decl_check.rs

@@ -57,11 +57,11 @@ pub fn incorrect_case(
 
 #[derive(Debug)]
 pub enum CaseType {
-    // `some_var`
+    /// `some_var`
     LowerSnakeCase,
-    // `SOME_CONST`
+    /// `SOME_CONST`
     UpperSnakeCase,
-    // `SomeStruct`
+    /// `SomeStruct`
     UpperCamelCase,
 }
 

crates/hir/src/diagnostics.rs

@@ -3,7 +3,7 @@
 //!
 //! This probably isn't the best way to do this -- ideally, diagnostics should
 //! be expressed in terms of hir types themselves.
-pub use hir_ty::diagnostics::{IncoherentImpl, IncorrectCase};
+pub use hir_ty::diagnostics::{CaseType, IncoherentImpl, IncorrectCase};
 
 use base_db::CrateId;
 use cfg::{CfgExpr, CfgOptions};

crates/hir/src/lib.rs

@@ -89,11 +89,11 @@ use crate::db::{DefDatabase, HirDatabase};
 pub use crate::{
     attrs::{HasAttrs, Namespace},
     diagnostics::{
-        AnyDiagnostic, BreakOutsideOfLoop, ExpectedFunction, InactiveCode, IncoherentImpl,
-        IncorrectCase, InvalidDeriveTarget, MacroDefError, MacroError, MacroExpansionParseError,
-        MalformedDerive, MismatchedArgCount, MissingFields, MissingMatchArms, MissingUnsafe,
-        MovedOutOfRef, NeedMut, NoSuchField, PrivateAssocItem, PrivateField,
-        ReplaceFilterMapNextWithFindMap, TypeMismatch, TypedHole, UndeclaredLabel,
+        AnyDiagnostic, BreakOutsideOfLoop, CaseType, ExpectedFunction, InactiveCode,
+        IncoherentImpl, IncorrectCase, InvalidDeriveTarget, MacroDefError, MacroError,
+        MacroExpansionParseError, MalformedDerive, MismatchedArgCount, MissingFields,
+        MissingMatchArms, MissingUnsafe, MovedOutOfRef, NeedMut, NoSuchField, PrivateAssocItem,
+        PrivateField, ReplaceFilterMapNextWithFindMap, TypeMismatch, TypedHole, UndeclaredLabel,
         UnimplementedBuiltinMacro, UnreachableLabel, UnresolvedExternCrate, UnresolvedField,
         UnresolvedImport, UnresolvedMacroCall, UnresolvedMethodCall, UnresolvedModule,
         UnresolvedProcMacro, UnusedMut,

crates/ide-diagnostics/Cargo.toml

@@ -16,6 +16,7 @@ cov-mark = "2.0.0-pre.1"
 either = "1.7.0"
 itertools = "0.10.5"
 serde_json = "1.0.86"
+once_cell = "1.17.0"
 
 # local deps
 profile.workspace = true

crates/ide-diagnostics/src/handlers/break_outside_of_loop.rs

@@ -1,4 +1,4 @@
-use crate::{Diagnostic, DiagnosticsContext};
+use crate::{Diagnostic, DiagnosticCode, DiagnosticsContext};
 
 // Diagnostic: break-outside-of-loop
 //
@@ -13,10 +13,11 @@ pub(crate) fn break_outside_of_loop(
         let construct = if d.is_break { "break" } else { "continue" };
         format!("{construct} outside of loop")
     };
-    Diagnostic::new(
-        "break-outside-of-loop",
+    Diagnostic::new_with_syntax_node_ptr(
+        ctx,
+        DiagnosticCode::RustcHardError("E0268"),
         message,
-        ctx.sema.diagnostics_display_range(d.expr.clone().map(|it| it.into())).range,
+        d.expr.clone().map(|it| it.into()),
     )
 }
 

crates/ide-diagnostics/src/handlers/expected_function.rs

@@ -1,6 +1,6 @@
 use hir::HirDisplay;
 
-use crate::{Diagnostic, DiagnosticsContext};
+use crate::{Diagnostic, DiagnosticCode, DiagnosticsContext};
 
 // Diagnostic: expected-function
 //
@@ -9,10 +9,11 @@ pub(crate) fn expected_function(
     ctx: &DiagnosticsContext<'_>,
     d: &hir::ExpectedFunction,
 ) -> Diagnostic {
-    Diagnostic::new(
-        "expected-function",
+    Diagnostic::new_with_syntax_node_ptr(
+        ctx,
+        DiagnosticCode::RustcHardError("E0618"),
         format!("expected function, found {}", d.found.display(ctx.sema.db)),
-        ctx.sema.diagnostics_display_range(d.call.clone().map(|it| it.into())).range,
+        d.call.clone().map(|it| it.into()),
     )
     .experimental()
 }

crates/ide-diagnostics/src/handlers/field_shorthand.rs

@@ -5,7 +5,7 @@ use ide_db::{base_db::FileId, source_change::SourceChange};
 use syntax::{ast, match_ast, AstNode, SyntaxNode};
 use text_edit::TextEdit;
 
-use crate::{fix, Diagnostic, Severity};
+use crate::{fix, Diagnostic, DiagnosticCode};
 
 pub(crate) fn field_shorthand(acc: &mut Vec<Diagnostic>, file_id: FileId, node: &SyntaxNode) {
     match_ast! {
@@ -46,14 +46,17 @@ fn check_expr_field_shorthand(
 
         let field_range = record_field.syntax().text_range();
         acc.push(
-            Diagnostic::new("use-field-shorthand", "Shorthand struct initialization", field_range)
-                .severity(Severity::WeakWarning)
-                .with_fixes(Some(vec![fix(
-                    "use_expr_field_shorthand",
-                    "Use struct shorthand initialization",
-                    SourceChange::from_text_edit(file_id, edit),
-                    field_range,
-                )])),
+            Diagnostic::new(
+                DiagnosticCode::Clippy("redundant_field_names"),
+                "Shorthand struct initialization",
+                field_range,
+            )
+            .with_fixes(Some(vec![fix(
+                "use_expr_field_shorthand",
+                "Use struct shorthand initialization",
+                SourceChange::from_text_edit(file_id, edit),
+                field_range,
+            )])),
         );
     }
 }
@@ -87,14 +90,17 @@ fn check_pat_field_shorthand(
 
         let field_range = record_pat_field.syntax().text_range();
         acc.push(
-            Diagnostic::new("use-field-shorthand", "Shorthand struct pattern", field_range)
-                .severity(Severity::WeakWarning)
-                .with_fixes(Some(vec![fix(
-                    "use_pat_field_shorthand",
-                    "Use struct field shorthand",
-                    SourceChange::from_text_edit(file_id, edit),
-                    field_range,
-                )])),
+            Diagnostic::new(
+                DiagnosticCode::Clippy("redundant_field_names"),
+                "Shorthand struct pattern",
+                field_range,
+            )
+            .with_fixes(Some(vec![fix(
+                "use_pat_field_shorthand",
+                "Use struct field shorthand",
+                SourceChange::from_text_edit(file_id, edit),
+                field_range,
+            )])),
         );
     }
 }

crates/ide-diagnostics/src/handlers/inactive_code.rs

@@ -1,7 +1,7 @@
 use cfg::DnfExpr;
 use stdx::format_to;
 
-use crate::{Diagnostic, DiagnosticsContext, Severity};
+use crate::{Diagnostic, DiagnosticCode, DiagnosticsContext, Severity};
 
 // Diagnostic: inactive-code
 //
@@ -27,13 +27,12 @@ pub(crate) fn inactive_code(
             format_to!(message, ": {}", inactive);
         }
     }
-
+    // FIXME: This shouldn't be a diagnostic
     let res = Diagnostic::new(
-        "inactive-code",
+        DiagnosticCode::Ra("inactive-code", Severity::WeakWarning),
         message,
         ctx.sema.diagnostics_display_range(d.node.clone()).range,
     )
-    .severity(Severity::WeakWarning)
     .with_unused(true);
     Some(res)
 }

crates/ide-diagnostics/src/handlers/incoherent_impl.rs

@@ -1,17 +1,17 @@
 use hir::InFile;
 
-use crate::{Diagnostic, DiagnosticsContext, Severity};
+use crate::{Diagnostic, DiagnosticCode, DiagnosticsContext};
 
 // Diagnostic: incoherent-impl
 //
 // This diagnostic is triggered if the targe type of an impl is from a foreign crate.
 pub(crate) fn incoherent_impl(ctx: &DiagnosticsContext<'_>, d: &hir::IncoherentImpl) -> Diagnostic {
-    Diagnostic::new(
-        "incoherent-impl",
+    Diagnostic::new_with_syntax_node_ptr(
+        ctx,
+        DiagnosticCode::RustcHardError("E0210"),
         format!("cannot define inherent `impl` for foreign type"),
-        ctx.sema.diagnostics_display_range(InFile::new(d.file_id, d.impl_.clone().into())).range,
+        InFile::new(d.file_id, d.impl_.clone().into()),
     )
-    .severity(Severity::Error)
 }
 
 #[cfg(test)]