Add Linux press-trigger daemon hotkey flow

linux_press_daemon.go

@@ -0,0 +1,83 @@
+//go:build linux
+
+package main
+
+import (
+	"net/http"
+	"os"
+	"os/exec"
+	"sync"
+	"time"
+)
+
+const linuxPressAddr = "127.0.0.1:9876"
+
+var (
+	linuxPressMu        sync.Mutex
+	linuxPressTimer     *time.Timer
+	linuxPressRecording bool
+)
+
+func init() {
+	if hasPressFlag(os.Args[1:]) {
+		if err := sendLinuxPressPing(); err != nil {
+			_ = exec.Command("notify-send", "Voice App", "Please open the main application first").Run()
+			os.Exit(1)
+		}
+		os.Exit(0)
+	}
+}
+
+func hasPressFlag(args []string) bool {
+	for _, arg := range args {
+		if arg == "--press" {
+			return true
+		}
+	}
+	return false
+}
+
+func sendLinuxPressPing() error {
+	client := &http.Client{Timeout: 300 * time.Millisecond}
+	resp, err := client.Get("http://" + linuxPressAddr + "/press")
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+	if resp.StatusCode < 200 || resp.StatusCode >= 300 {
+		return os.ErrNotExist
+	}
+	return nil
+}
+
+func (a *App) startLinuxPressDaemon() {
+	mux := http.NewServeMux()
+	mux.HandleFunc("/press", func(w http.ResponseWriter, r *http.Request) {
+		linuxPressMu.Lock()
+		defer linuxPressMu.Unlock()
+
+		if !linuxPressRecording {
+			linuxPressRecording = 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()
+			}
+		})
+
+		w.WriteHeader(http.StatusNoContent)
+	})
+
+	go func() {
+		_ = http.ListenAndServe(linuxPressAddr, mux)
+	}()
+}