Make flame tab default and fix flame hotkey routing

1 files changed, 26 insertions, 0 deletions

diff --git a/internal/tui/flamegraph/renderer.go b/internal/tui/flamegraph/renderer.go
index ad74173..9f31023 100644
--- a/internal/tui/flamegraph/renderer.go
+++ b/internal/tui/flamegraph/renderer.go
@@ -102,6 +102,10 @@ func frameName(name string, depth int) string {
 }
 
 func terminalFrameColor(name string) color.Color {
+	if semantic, ok := semanticFrameColor(name); ok {
+		return semantic
+	}
+
 	hasher := fnv.New32a()
 	_, _ = hasher.Write([]byte(name))
 	h := hasher.Sum32()
@@ -113,6 +117,28 @@ func terminalFrameColor(name string) color.Color {
 	}
 }
 
+func semanticFrameColor(name string) (color.Color, bool) {
+	label := strings.ToLower(strings.TrimSpace(name))
+	switch {
+	case label == "":
+		return nil, false
+	case strings.Contains(label, "read"), strings.Contains(label, "pread"):
+		return color.RGBA{R: 78, G: 132, B: 201, A: 255}, true // read I/O: blue
+	case strings.Contains(label, "write"), strings.Contains(label, "pwrite"):
+		return color.RGBA{R: 222, G: 122, B: 58, A: 255}, true // write I/O: orange
+	case strings.Contains(label, "open"), strings.Contains(label, "close"), strings.Contains(label, "stat"), strings.Contains(label, "rename"), strings.Contains(label, "link"):
+		return color.RGBA{R: 196, G: 168, B: 72, A: 255}, true // metadata I/O: amber
+	case strings.HasPrefix(label, "/"), strings.Contains(label, "path:"), strings.Contains(label, "/"):
+		return color.RGBA{R: 88, G: 156, B: 84, A: 255}, true // file paths: green
+	case strings.Contains(label, "pid"), strings.Contains(label, "tid"):
+		return color.RGBA{R: 67, G: 151, B: 149, A: 255}, true // process/thread dimensions: teal
+	case strings.HasPrefix(label, "sys_"):
+		return color.RGBA{R: 191, G: 99, B: 74, A: 255}, true // other syscall buckets: rust
+	default:
+		return nil, false
+	}
+}
+
 // RenderTerminalView renders a terminal flamegraph viewport from laid out frames.
 func RenderTerminalView(frames []tuiFrame, width, height, selectedIdx int, subtreeSet, matchSet map[int]bool, isDark, searchActive bool, searchQuery string) string {
 	if width < minFlameWidth {