nixos-configs/packages/gastown/gastown-statusline-optimization.patch

diff --git a/internal/cmd/statusline.go b/internal/cmd/statusline.go
index 2edf1be8..00253eea 100644
--- a/internal/cmd/statusline.go
+++ b/internal/cmd/statusline.go
@@ -6,6 +6,7 @@ import (
 	"path/filepath"
 	"sort"
 	"strings"
+	"time"
 
 	"github.com/spf13/cobra"
 	"github.com/steveyegge/gastown/internal/beads"
@@ -14,6 +15,37 @@ import (
 	"github.com/steveyegge/gastown/internal/tmux"
 	"github.com/steveyegge/gastown/internal/workspace"
 )
+// statusLineCacheTTL is how long cached status output remains valid.
+const statusLineCacheTTL = 10 * time.Second
+
+// statusLineCachePath returns the cache file path for a session.
+func statusLineCachePath(session string) string {
+	return filepath.Join(os.TempDir(), fmt.Sprintf("gt-status-%s", session))
+}
+
+// getStatusLineCache returns cached status if fresh, empty string otherwise.
+func getStatusLineCache(session string) string {
+	path := statusLineCachePath(session)
+	info, err := os.Stat(path)
+	if err != nil {
+		return ""
+	}
+	if time.Since(info.ModTime()) > statusLineCacheTTL {
+		return ""
+	}
+	data, err := os.ReadFile(path)
+	if err != nil {
+		return ""
+	}
+	return string(data)
+}
+
+// setStatusLineCache writes status to cache file.
+func setStatusLineCache(session, status string) {
+	path := statusLineCachePath(session)
+	_ = os.WriteFile(path, []byte(status), 0644)
+}
+
 
 var (
 	statusLineSession string
@@ -34,6 +66,19 @@ func init() {
 func runStatusLine(cmd *cobra.Command, args []string) error {
 	t := tmux.NewTmux()
 
+	// Optimization: skip expensive beads queries for detached sessions
+	if statusLineSession != "" {
+		if !t.IsSessionAttached(statusLineSession) {
+			fmt.Print("○ |")
+			return nil
+		}
+		// Check cache for attached sessions too
+		if cached := getStatusLineCache(statusLineSession); cached != "" {
+			fmt.Print(cached)
+			return nil
+		}
+	}
+
 	// Get session environment
 	var rigName, polecat, crew, issue, role string
 
@@ -150,7 +195,11 @@ func runWorkerStatusLine(t *tmux.Tmux, session, rigName, polecat, crew, issue st
 
 	// Output
 	if len(parts) > 0 {
-		fmt.Print(strings.Join(parts, " | ") + " |")
+		output := strings.Join(parts, " | ") + " |"
+		if statusLineSession != "" {
+			setStatusLineCache(statusLineSession, output)
+		}
+		fmt.Print(output)
 	}
 
 	return nil
@@ -389,7 +438,11 @@ func runMayorStatusLine(t *tmux.Tmux) error {
 		}
 	}
 
-	fmt.Print(strings.Join(parts, " | ") + " |")
+	output := strings.Join(parts, " | ") + " |"
+	if statusLineSession != "" {
+		setStatusLineCache(statusLineSession, output)
+	}
+	fmt.Print(output)
 	return nil
 }
 
@@ -458,7 +511,11 @@ func runDeaconStatusLine(t *tmux.Tmux) error {
 		}
 	}
 
-	fmt.Print(strings.Join(parts, " | ") + " |")
+	output := strings.Join(parts, " | ") + " |"
+	if statusLineSession != "" {
+		setStatusLineCache(statusLineSession, output)
+	}
+	fmt.Print(output)
 	return nil
 }
 
@@ -526,7 +583,11 @@ func runWitnessStatusLine(t *tmux.Tmux, rigName string) error {
 		}
 	}
 
-	fmt.Print(strings.Join(parts, " | ") + " |")
+	output := strings.Join(parts, " | ") + " |"
+	if statusLineSession != "" {
+		setStatusLineCache(statusLineSession, output)
+	}
+	fmt.Print(output)
 	return nil
 }
 
@@ -617,7 +678,11 @@ func runRefineryStatusLine(t *tmux.Tmux, rigName string) error {
 		}
 	}
 
-	fmt.Print(strings.Join(parts, " | ") + " |")
+	output := strings.Join(parts, " | ") + " |"
+	if statusLineSession != "" {
+		setStatusLineCache(statusLineSession, output)
+	}
+	fmt.Print(output)
 	return nil
 }