feat: add screen refresh rate display in status view

cmd/status/metrics.go

@@ -37,11 +37,12 @@ type MetricsSnapshot struct {
 }
 
 type HardwareInfo struct {
-	Model     string // MacBook Pro 14-inch, 2021
-	CPUModel  string // Apple M1 Pro / Intel Core i7
-	TotalRAM  string // 16GB
-	DiskSize  string // 512GB
-	OSVersion string // macOS Sonoma 14.5
+	Model       string // MacBook Pro 14-inch, 2021
+	CPUModel    string // Apple M1 Pro / Intel Core i7
+	TotalRAM    string // 16GB
+	DiskSize    string // 512GB
+	OSVersion   string // macOS Sonoma 14.5
+	RefreshRate string // 120Hz / 60Hz
 }
 
 type DiskIOStatus struct {

cmd/status/metrics_hardware.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"context"
+	"fmt"
 	"runtime"
 	"strings"
 	"time"
@@ -10,11 +11,12 @@ import (
 func collectHardware(totalRAM uint64, disks []DiskStatus) HardwareInfo {
 	if runtime.GOOS != "darwin" {
 		return HardwareInfo{
-			Model:     "Unknown",
-			CPUModel:  runtime.GOARCH,
-			TotalRAM:  humanBytes(totalRAM),
-			DiskSize:  "Unknown",
-			OSVersion: runtime.GOOS,
+			Model:       "Unknown",
+			CPUModel:    runtime.GOARCH,
+			TotalRAM:    humanBytes(totalRAM),
+			DiskSize:    "Unknown",
+			OSVersion:   runtime.GOOS,
+			RefreshRate: "",
 		}
 	}
 
@@ -22,7 +24,7 @@ func collectHardware(totalRAM uint64, disks []DiskStatus) HardwareInfo {
 	ctx, cancel := context.WithTimeout(context.Background(), 3*time.Second)
 	defer cancel()
 
-	var model, cpuModel, osVersion string
+	var model, cpuModel, osVersion, refreshRate string
 
 	out, err := runCmd(ctx, "system_profiler", "SPHardwareDataType")
 	if err == nil {
@@ -58,16 +60,79 @@ func collectHardware(totalRAM uint64, disks []DiskStatus) HardwareInfo {
 		osVersion = "macOS " + strings.TrimSpace(out2)
 	}
 
+	// Get refresh rate from display info (use mini detail to keep it fast).
+	ctx3, cancel3 := context.WithTimeout(context.Background(), 2*time.Second)
+	defer cancel3()
+	out3, err := runCmd(ctx3, "system_profiler", "-detailLevel", "mini", "SPDisplaysDataType")
+	if err == nil {
+		refreshRate = parseRefreshRate(out3)
+	}
+
 	diskSize := "Unknown"
 	if len(disks) > 0 {
 		diskSize = humanBytes(disks[0].Total)
 	}
 
 	return HardwareInfo{
-		Model:     model,
-		CPUModel:  cpuModel,
-		TotalRAM:  humanBytes(totalRAM),
-		DiskSize:  diskSize,
-		OSVersion: osVersion,
+		Model:       model,
+		CPUModel:    cpuModel,
+		TotalRAM:    humanBytes(totalRAM),
+		DiskSize:    diskSize,
+		OSVersion:   osVersion,
+		RefreshRate: refreshRate,
 	}
 }
+
+// parseRefreshRate extracts the highest refresh rate from system_profiler display output.
+func parseRefreshRate(output string) string {
+	lines := strings.Split(output, "\n")
+	maxHz := 0
+
+	for _, line := range lines {
+		lower := strings.ToLower(line)
+		// Look for patterns like "@ 60Hz", "@ 60.00Hz", or "Refresh Rate: 120 Hz".
+		if strings.Contains(lower, "hz") {
+			fields := strings.Fields(lower)
+			for i, field := range fields {
+				if field == "hz" && i > 0 {
+					if hz := parseInt(fields[i-1]); hz > maxHz && hz < 500 {
+						maxHz = hz
+					}
+					continue
+				}
+				if strings.HasSuffix(field, "hz") {
+					numStr := strings.TrimSuffix(field, "hz")
+					if numStr == "" && i > 0 {
+						numStr = fields[i-1]
+					}
+					if hz := parseInt(numStr); hz > maxHz && hz < 500 {
+						maxHz = hz
+					}
+				}
+			}
+		}
+	}
+
+	if maxHz > 0 {
+		return fmt.Sprintf("%dHz", maxHz)
+	}
+	return ""
+}
+
+// parseInt safely parses an integer from a string.
+func parseInt(s string) int {
+	// Trim away non-numeric padding, keep digits and '.' for decimals.
+	cleaned := strings.TrimSpace(s)
+	cleaned = strings.TrimLeftFunc(cleaned, func(r rune) bool {
+		return (r < '0' || r > '9') && r != '.'
+	})
+	cleaned = strings.TrimRightFunc(cleaned, func(r rune) bool {
+		return (r < '0' || r > '9') && r != '.'
+	})
+	if cleaned == "" {
+		return 0
+	}
+	var num int
+	fmt.Sscanf(cleaned, "%d", &num)
+	return num
+}

cmd/status/view.go

@@ -125,6 +125,9 @@ func renderHeader(m MetricsSnapshot, errMsg string, animFrame int, termWidth int
 	if len(specs) > 0 {
 		infoParts = append(infoParts, strings.Join(specs, "/"))
 	}
+	if m.Hardware.RefreshRate != "" {
+		infoParts = append(infoParts, m.Hardware.RefreshRate)
+	}
 	if m.Hardware.OSVersion != "" {
 		infoParts = append(infoParts, m.Hardware.OSVersion)
 	}