From 19f476b932f0d2defd1baee36081198d800fc953 Mon Sep 17 00:00:00 2001
From: Apologieze <47333595+Apologieze@users.noreply.github.com>
Date: Mon, 17 Mar 2025 19:49:39 -0400
Subject: [PATCH] Added single instance

---
 go.mod                |  1 +
 go.sum                |  2 ++
 src/main.go           | 17 ++++++++++---
 src/singleInstance.go | 58 +++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 74 insertions(+), 4 deletions(-)
 create mode 100644 src/singleInstance.go

diff --git a/go.mod b/go.mod
index c85ccb4..a09c872 100644
--- a/go.mod
+++ b/go.mod
@@ -13,6 +13,7 @@ require (
 	github.com/dweymouth/fyne-tooltip v0.2.1
 	github.com/gen2brain/beeep v0.0.0-20240516210008-9c006672e7f4
 	github.com/hugolgst/rich-go v0.0.0-20240715122152-74618cc1ace2
+	github.com/nightlyone/lockfile v1.0.0
 )
 
 require (
diff --git a/go.sum b/go.sum
index f2be666..ae9d6e0 100644
--- a/go.sum
+++ b/go.sum
@@ -275,6 +275,8 @@ github.com/nicksnyder/go-i18n/v2 v2.4.0 h1:3IcvPOAvnCKwNm0TB0dLDTuawWEj+ax/RERNC
 github.com/nicksnyder/go-i18n/v2 v2.4.0/go.mod h1:nxYSZE9M0bf3Y70gPQjN9ha7XNHX7gMc814+6wVyEI4=
 github.com/niemeyer/pretty v0.0.0-20200227124842-a10e7caefd8e h1:fD57ERR4JtEqsWbfPhv4DMiApHyliiK5xCTNVSPiaAs=
 github.com/niemeyer/pretty v0.0.0-20200227124842-a10e7caefd8e/go.mod h1:zD1mROLANZcx1PVRCS0qkT7pwLkGfwJo4zjcN/Tysno=
+github.com/nightlyone/lockfile v1.0.0 h1:RHep2cFKK4PonZJDdEl4GmkabuhbsRMgk/k3uAmxBiA=
+github.com/nightlyone/lockfile v1.0.0/go.mod h1:rywoIealpdNse2r832aiD9jRk8ErCatROs6LzC841CI=
 github.com/nu7hatch/gouuid v0.0.0-20131221200532-179d4d0c4d8d h1:VhgPp6v9qf9Agr/56bj7Y/xa04UccTW04VP0Qed4vnQ=
 github.com/nu7hatch/gouuid v0.0.0-20131221200532-179d4d0c4d8d/go.mod h1:YUTz3bUH2ZwIWBy3CJBeOBEugqcmXREj14T+iG/4k4U=
 github.com/pascaldekloe/goe v0.0.0-20180627143212-57f6aae5913c/go.mod h1:lzWF7FIEvWOWxwDKqyGYQf6ZUaNfKdP144TG7ZOy1lc=
diff --git a/src/main.go b/src/main.go
index 70a7841..33454d2 100644
--- a/src/main.go
+++ b/src/main.go
@@ -29,7 +29,7 @@ import (
 
 const (
 	AppID   = "fr.apologize.benri"
-	AppName = "AnimeGUI"
+	AppName = "Benri"
 )
 
 var (
@@ -48,11 +48,19 @@ var (
 )
 
 func main() {
+	appW = app.NewWithID(AppID)
+
+	config.CreateConfig(appW.Preferences())
+	if config.Setting.TrayIcon {
+		// Initialize lockfile
+		lock := initLock()
+		defer lock.Unlock()
+	}
+
+	go pollingNewAppDetection()
 
 	go dowloadMPV()
 
-	appW = app.NewWithID(AppID)
-
 	window = appW.NewWindow(AppName)
 	window.Resize(fyne.NewSize(1000, 700))
 	window.CenterOnScreen()
@@ -69,8 +77,10 @@ func main() {
 	if !changedToken {
 		fmt.Println(window.Title(), AppName)
 		initMainApp()
+
 		appW.Run()
 	}
+
 }
 
 func updateAnimeNames(data *binding.ExternalStringList) (first bool) {
@@ -336,7 +346,6 @@ func initMainApp() {
 		imageContainer.Refresh()
 	}
 
-	config.CreateConfig(appW.Preferences())
 	initSettingDialog()
 	initPlayMorePopUp()
 
diff --git a/src/singleInstance.go b/src/singleInstance.go
new file mode 100644
index 0000000..ef28273
--- /dev/null
+++ b/src/singleInstance.go
@@ -0,0 +1,58 @@
+package main
+
+import (
+	"fmt"
+	"github.com/charmbracelet/log"
+	"github.com/nightlyone/lockfile"
+	"os"
+	"time"
+)
+
+var (
+	lockPath   = os.TempDir() + "/" + AppName + ".lock"
+	notifyPath = os.TempDir() + "/" + AppName + ".notify"
+)
+
+func initLock() lockfile.Lockfile {
+	lock, err := lockfile.New(lockPath)
+	if err != nil {
+		fmt.Printf("Cannot init lockfile: %v\n", err)
+		os.Exit(1)
+	}
+
+	// Try to acquire the lock
+	err = lock.TryLock()
+	if err != nil {
+		fmt.Println("Application is already running")
+
+		// Touch the notification file to signal the first instance
+		currentTime := []byte(fmt.Sprintf("%d", time.Now().UnixNano()))
+		_ = os.WriteFile(notifyPath, currentTime, 0644)
+
+		os.Exit(0)
+	}
+	return lock
+}
+
+func pollingNewAppDetection() {
+	var lastModTime time.Time
+
+	info, err := os.Stat(notifyPath)
+	if err == nil {
+		lastModTime = info.ModTime()
+	}
+
+	for {
+		// Check if notification file exists
+		info, err := os.Stat(notifyPath)
+
+		if err == nil && info.ModTime().After(lastModTime) {
+			log.Info("New instance detected, bringing to front")
+			window.Show()
+			window.RequestFocus()
+			lastModTime = info.ModTime()
+		}
+
+		time.Sleep(500 * time.Millisecond)
+	}
+}