[Diagnostics formatter] Consistently apply diagnostic kinds

Sources/SwiftDiagnostics/DiagnosticsFormatter.swift

@@ -327,20 +327,20 @@ public struct DiagnosticsFormatter {
   /// Annotates the given ``DiagnosticMessage`` with an appropriate ANSI color code (if the value of the `colorize`
   /// property is `true`) and returns the result as a printable string.
   private func colorizeIfRequested(_ message: DiagnosticMessage) -> String {
-    guard colorize else {
-      return message.message
-    }
-
     switch message.severity {
     case .error:
       let annotation = ANSIAnnotation(color: .red, trait: .bold)
-      return annotation.applied(to: "error: \(message.message)")
+      return colorizeIfRequested("error: \(message.message)", annotation: annotation)
+
     case .warning:
       let color = ANSIAnnotation(color: .yellow)
-      let prefix = color.withTrait(.bold).applied(to: "warning: ")
-      return prefix + color.applied(to: message.message)
+      let prefix = colorizeIfRequested("warning: ", annotation: color.withTrait(.bold))
+
+      return prefix + colorizeIfRequested(message.message, annotation: color);
     case .note:
-      return message.message
+      let color = ANSIAnnotation(color: .default, trait: .bold)
+      let prefix = colorizeIfRequested("note: ", annotation: color)
+      return prefix + message.message
     }
   }
 

Tests/SwiftDiagnosticsTest/DiagnosticsFormatterTests.swift

@@ -30,7 +30,7 @@ final class DiagnosticsFormatterTests: XCTestCase {
       """
     let expectedOutput = """
       1 │ var foo = bar +
-        ∣                ╰─ expected expression after operator
+        ∣                ╰─ error: expected expression after operator
 
       """
     AssertStringsEqualWithDiff(annotate(source: source), expectedOutput)
@@ -42,9 +42,9 @@ final class DiagnosticsFormatterTests: XCTestCase {
       """
     let expectedOutput = """
       1 │ foo.[].[].[]
-        ∣     │  │  ╰─ expected name in member access
-        ∣     │  ╰─ expected name in member access
-        ∣     ╰─ expected name in member access
+        ∣     │  │  ╰─ error: expected name in member access
+        ∣     │  ╰─ error: expected name in member access
+        ∣     ╰─ error: expected name in member access
 
       """
     AssertStringsEqualWithDiff(annotate(source: source), expectedOutput)
@@ -68,14 +68,14 @@ final class DiagnosticsFormatterTests: XCTestCase {
        2 │ i = 2
        3 │ i = foo(
        4 │ i = 4
-         ∣      ╰─ expected ')' to end function call
+         ∣      ╰─ error: expected ')' to end function call
        5 │ i = 5
        6 │ i = 6
          ┆
        9 │ i = 9
       10 │ i = 10
       11 │ i = bar(
-         ∣         ╰─ expected value and ')' to end function call
+         ∣         ╰─ error: expected value and ')' to end function call
 
       """
     AssertStringsEqualWithDiff(annotate(source: source), expectedOutput)
@@ -86,8 +86,8 @@ final class DiagnosticsFormatterTests: XCTestCase {
 
     let expectedOutput = """
       1 │ t as (..)
-        ∣       ├─ expected type in tuple type
-        ∣       ╰─ unexpected code '..' in tuple type
+        ∣       ├─ error: expected type in tuple type
+        ∣       ╰─ error: unexpected code '..' in tuple type
 
       """
 

Tests/SwiftDiagnosticsTest/GroupDiagnosticsFormatterTests.swift

@@ -114,17 +114,17 @@ final class GroupedDiagnosticsFormatterTests: XCTestCase {
       === main.swift ===
       1 │ let pi = 3.14159
       2 │ #myAssert(pi == 3)
-        ∣ ╰─ in expansion of macro 'myAssert' here
+        ∣ ╰─ note: in expansion of macro 'myAssert' here
         ╭─── #myAssert ───────────────────────────────────────────────────────
         │1 │ let __a = pi
         │2 │ let __b = 3
         │3 │ if !(__a == __b) {
-        │  ∣          ╰─ no matching operator '==' for types 'Double' and 'Int'
+        │  ∣          ╰─ error: no matching operator '==' for types 'Double' and 'Int'
         │4 │   fatalError("assertion failed: pi != 3")
         │5 │ }
         ╰─────────────────────────────────────────────────────────────────────
       3 │ print("hello"
-        ∣              ╰─ expected ')' to end function call
+        ∣              ╰─ error: expected ')' to end function call
 
       """
     )
@@ -183,21 +183,21 @@ final class GroupedDiagnosticsFormatterTests: XCTestCase {
       === main.swift ===
       1 │ let pi = 3.14159
       2 │ #myAssert(pi == 3)
-        ∣ ╰─ in expansion of macro 'myAssert' here
+        ∣ ╰─ note: in expansion of macro 'myAssert' here
         ╭─── #myAssert ───────────────────────────────────────────────────────
         │1 │ let __a = pi
         │2 │ let __b = 3
         │3 │ if #invertedEqualityCheck(__a, __b) {
-        │  ∣    ╰─ in expansion of macro 'invertedEqualityCheck' here
+        │  ∣    ╰─ note: in expansion of macro 'invertedEqualityCheck' here
         │  ╭─── #invertedEqualityCheck ───────────────────────────────────────
         │  │1 │ !(__a == __b)
-        │  │  ∣       ╰─ no matching operator '==' for types 'Double' and 'Int'
+        │  │  ∣       ╰─ error: no matching operator '==' for types 'Double' and 'Int'
         │  ╰──────────────────────────────────────────────────────────────────
         │4 │   fatalError("assertion failed: pi != 3")
         │5 │ }
         ╰─────────────────────────────────────────────────────────────────────
       3 │ print("hello"
-        ∣              ╰─ expected ')' to end function call
+        ∣              ╰─ error: expected ')' to end function call
 
       """
     )

Tests/SwiftSyntaxBuilderTest/StringInterpolationTests.swift

@@ -418,7 +418,7 @@ final class StringInterpolationTests: XCTestCase {
         """
 
         1 │ /*comment*/ invalid /*comm*/
-          ∣             ╰─ unexpected trivia 'invalid'
+          ∣             ╰─ error: unexpected trivia 'invalid'
 
         """
       )
@@ -435,8 +435,8 @@ final class StringInterpolationTests: XCTestCase {
         """
 
         1 │ return 1
-          ∣ │       ╰─ expected declaration
-          ∣ ╰─ unexpected code 'return 1' before declaration
+          ∣ │       ╰─ error: expected declaration
+          ∣ ╰─ error: unexpected code 'return 1' before declaration
 
         """
       )
@@ -453,8 +453,8 @@ final class StringInterpolationTests: XCTestCase {
         """
 
         1 │ struct Foo {}
-          ∣ │            ╰─ expected statement
-          ∣ ╰─ unexpected code 'struct Foo {}' before statement
+          ∣ │            ╰─ error: expected statement
+          ∣ ╰─ error: unexpected code 'struct Foo {}' before statement
 
         """
       )