feat: implement enhanced Linux hotkey handling and add command copying functionality

linux_press_daemon.go

@@ -13,9 +13,21 @@ import (
 const linuxPressAddr = "127.0.0.1:9876"
 
 var (
-	linuxPressMu        sync.Mutex
-	linuxPressTimer     *time.Timer
-	linuxPressRecording bool
+	linuxPressMu            sync.Mutex
+	linuxPressReleaseTimer  *time.Timer
+	linuxPressDetectTimer   *time.Timer
+	linuxPressRecording     bool
+	linuxPressHoldMode      bool
+	linuxPressDetectingHold bool
+)
+
+const (
+	// GNOME custom shortcuts commonly auto-repeat while the key is held.
+	// If we see a second ping quickly, treat the shortcut as push-to-talk.
+	linuxPressHoldDetectWindow = 1200 * time.Millisecond
+
+	// Once hold mode is confirmed, lack of fresh pings means the key was released.
+	linuxPressReleaseGrace = 450 * time.Millisecond
 )
 
 func init() {
@@ -58,22 +70,36 @@ func (a *App) startLinuxPressDaemon() {
 
 		if !linuxPressRecording {
 			linuxPressRecording = true
+			linuxPressHoldMode = false
+			linuxPressDetectingHold = true
 			go a.StartRecording()
-		}
 
-		if linuxPressTimer != nil {
-			linuxPressTimer.Stop()
-		}
-
-		linuxPressTimer = time.AfterFunc(300*time.Millisecond, func() {
-			linuxPressMu.Lock()
-			defer linuxPressMu.Unlock()
-			if linuxPressRecording {
-				linuxPressRecording = false
-				go a.StopRecording()
+			if linuxPressDetectTimer != nil {
+				linuxPressDetectTimer.Stop()
 			}
-		})
+			linuxPressDetectTimer = time.AfterFunc(linuxPressHoldDetectWindow, func() {
+				linuxPressMu.Lock()
+				defer linuxPressMu.Unlock()
+				linuxPressDetectingHold = false
+			})
 
+			w.WriteHeader(http.StatusNoContent)
+			return
+		}
+
+		if linuxPressDetectingHold || linuxPressHoldMode {
+			linuxPressHoldMode = true
+			linuxPressDetectingHold = false
+			if linuxPressDetectTimer != nil {
+				linuxPressDetectTimer.Stop()
+				linuxPressDetectTimer = nil
+			}
+			resetLinuxPressReleaseTimer(a)
+			w.WriteHeader(http.StatusNoContent)
+			return
+		}
+
+		stopLinuxPressRecording(a)
 		w.WriteHeader(http.StatusNoContent)
 	})
 
@@ -81,3 +107,34 @@ func (a *App) startLinuxPressDaemon() {
 		_ = http.ListenAndServe(linuxPressAddr, mux)
 	}()
 }
+
+func resetLinuxPressReleaseTimer(a *App) {
+	if linuxPressReleaseTimer != nil {
+		linuxPressReleaseTimer.Stop()
+	}
+
+	linuxPressReleaseTimer = time.AfterFunc(linuxPressReleaseGrace, func() {
+		linuxPressMu.Lock()
+		defer linuxPressMu.Unlock()
+		if linuxPressRecording && linuxPressHoldMode {
+			stopLinuxPressRecording(a)
+		}
+	})
+}
+
+func stopLinuxPressRecording(a *App) {
+	if linuxPressReleaseTimer != nil {
+		linuxPressReleaseTimer.Stop()
+		linuxPressReleaseTimer = nil
+	}
+	if linuxPressDetectTimer != nil {
+		linuxPressDetectTimer.Stop()
+		linuxPressDetectTimer = nil
+	}
+	if linuxPressRecording {
+		linuxPressRecording = false
+		linuxPressHoldMode = false
+		linuxPressDetectingHold = false
+		go a.StopRecording()
+	}
+}