Add emoji prefixes to Warning and Error output

README.md

@@ -404,8 +404,8 @@ Message classes:
 | Complete | `》` (green) | column 0 | An operation just finished (past-tense verb) |
 | Info | `》` (white) | column 0 | Neutral status update |
 | Notice | `》` (cyan) | column 0 | Important note that is not a warning |
-| Warning | `Warning:` (orange/yellow) | column 0 | Recoverable problem |
-| Error | `ERROR:` (red) | column 0 | Operation aborted |
+| Warning | `⚠️  Warning:` (orange/yellow) | column 0 | Recoverable problem |
+| Error | `❌ ERROR:` (red) | column 0 | Operation aborted |
 | Progress | `  》` (white) | column 2 | Heartbeat or per-item status during a long-running operation |
 
 Conventions:
@@ -446,7 +446,8 @@ ANSI escapes inline:
 
 When `NO_COLOR` is set or output is not a TTY, all helpers return plain
 text and the marker prefixes (`》`, `Warning:`, `ERROR:`) emit without
-ANSI escapes.
+ANSI escapes. The emoji prefixes on Warning and Error are always emitted
+regardless of color setting (emoji are not color).
 
 ## requirements
 

internal/ui/ui.go

@@ -113,17 +113,17 @@ func (w *Writer) Notice(format string, args ...any) {
 	w.emit(ansiCyan, Marker, "", format, args)
 }
 
-// Warning prints "Warning: " in orange/yellow followed by the message.
+// Warning prints "⚠️  Warning: " in orange/yellow followed by the message.
 func (w *Writer) Warning(format string, args ...any) {
-	prefix := w.paint(ansiYellow+ansiBold, "Warning: ")
+	prefix := "⚠️  " + w.paint(ansiYellow+ansiBold, "Warning: ")
 	_, _ = fmt.Fprintln(w.out, prefix+fmt.Sprintf(format, args...))
 }
 
-// Error prints "ERROR: " in red followed by the message. Goes to the same
-// writer as everything else; callers that want stderr should construct a
-// separate Writer for it.
+// Error prints "❌ ERROR: " in red followed by the message. Goes to the
+// same writer as everything else; callers that want stderr should
+// construct a separate Writer for it.
 func (w *Writer) Error(format string, args ...any) {
-	prefix := w.paint(ansiRed+ansiBold, "ERROR: ")
+	prefix := "❌ " + w.paint(ansiRed+ansiBold, "ERROR: ")
 	_, _ = fmt.Fprintln(w.out, prefix+fmt.Sprintf(format, args...))
 }
 

internal/ui/ui_test.go

@@ -22,8 +22,8 @@ func TestMessageMethodsPlain(t *testing.T) {
 		{"Complete", func(w *Writer) { w.Complete("done %s", "thing") }, "》 done thing\n"},
 		{"Info", func(w *Writer) { w.Info("status") }, "》 status\n"},
 		{"Notice", func(w *Writer) { w.Notice("note") }, "》 note\n"},
-		{"Warning", func(w *Writer) { w.Warning("oops") }, "Warning: oops\n"},
-		{"Error", func(w *Writer) { w.Error("boom") }, "ERROR: boom\n"},
+		{"Warning", func(w *Writer) { w.Warning("oops") }, "⚠️  Warning: oops\n"},
+		{"Error", func(w *Writer) { w.Error("boom") }, "❌ ERROR: boom\n"},
 		{"Progress", func(w *Writer) { w.Progress("p") }, "  》 p\n"},
 		{"Banner", func(w *Writer) { w.Banner("hello") }, "hello\n"},
 	}