support multiple instances with different layouts

if specified layout for nth instance is different than 1st, the player data is
    shared instead of the waybar output.

.drone.yml

@@ -14,7 +14,7 @@ steps:
         - ./goreleaser.sh --snapshot --skip-publish --rm-dist
         - wget https://builds.hrfee.pw/upload.py
         - pip3 install requests
-        - bash -c 'python3 upload.py https://builds2.hrfee.pw hrfee waybar-mpris ./dist/*.tar.gz'
+        - bash -c 'python3 upload.py https://builds2.hrfee.pw hrfee waybar-mpris --upload ./dist/*.tar.gz'
       environment:
           BUILDRONE_KEY:
               from_secret: BUILDRONE_KEY

.gitignore

@@ -1 +1,2 @@
 ./main
+waybar-mpris

README.md

@@ -3,6 +3,9 @@
     <img src="images/cropped.gif" style="width: 100%;" alt="bar gif"></img>
 </p>
 
+##### Downloads:
+##### [binary](https://builds2.hrfee.pw/view/hrfee/waybar-mpris) | [aur](https://aur.archlinux.org/packages/waybar-mpris-git/)
+
 a waybar component/utility for displaying and controlling MPRIS2 compliant media players individually, inspired by [waybar-media](https://github.com/yurihs/waybar-media). 
 
 MPRIS2 is widely supported, so this component should work with:
@@ -20,7 +23,7 @@ Available on the AUR as [waybar-mpris-git](https://aur.archlinux.org/packages/wa
 
 `go get git.hrfee.pw/hrfee/waybar-mpris` will compile from source and install.
 
-You can also download a precompiled binaries from [here](https://builds2.hrfee.pw/view/hrfee/waybar-mpris).
+You can also download a precompiled binary from [here](https://builds2.hrfee.pw/view/hrfee/waybar-mpris).
 
 ## Issues
 Stick them on [mpris2client](https://github.com/hrfee/mpris2client) or the [og](https://github.com/hrfee/waybar-mpris) repository (both on github) if you can't make an account here.

go.mod

@@ -3,12 +3,9 @@ module git.hrfee.pw/hrfee/waybar-mpris
 go 1.15
 
 require (
-	github.com/fsnotify/fsnotify v1.4.9 // indirect
+	github.com/fsnotify/fsnotify v1.4.9
 	github.com/godbus/dbus/v5 v5.0.3
-	github.com/hpcloud/tail v1.0.0
 	github.com/hrfee/mpris2client v0.0.5
 	github.com/spf13/pflag v1.0.5
 	golang.org/x/sys v0.0.0-20210113181707-4bcb84eeeb78 // indirect
-	gopkg.in/fsnotify.v1 v1.4.7 // indirect
-	gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 // indirect
 )

go.sum

@@ -2,28 +2,10 @@ github.com/fsnotify/fsnotify v1.4.9 h1:hsms1Qyu0jgnwNXIxa+/V/PDsU6CfLf6CNO8H7IWo
 github.com/fsnotify/fsnotify v1.4.9/go.mod h1:znqG4EE+3YCdAaPaxE2ZRY/06pZUdp0tY4IgpuI1SZQ=
 github.com/godbus/dbus/v5 v5.0.3 h1:ZqHaoEF7TBzh4jzPmqVhE/5A1z9of6orkAe5uHoAeME=
 github.com/godbus/dbus/v5 v5.0.3/go.mod h1:xhWf0FNVPg57R7Z0UbKHbJfkEywrmjJnf7w5xrFpKfA=
-github.com/hpcloud/tail v1.0.0 h1:nfCOvKYfkgYP8hkirhJocXT2+zOD8yUNjXaWfTlyFKI=
-github.com/hpcloud/tail v1.0.0/go.mod h1:ab1qPbhIpdTxEkNHXyeSf5vhxWSCs/tWer42PpOxQnU=
-github.com/hrfee/mpris2client v0.0.0-20210108004725-d2a36745cc4a h1:3H1awMdF3eJBCg0QPpDtNW+ujQPvUCuLsqlMRoODMA4=
-github.com/hrfee/mpris2client v0.0.0-20210108004725-d2a36745cc4a/go.mod h1:tVpzzAlsljmQevNA4mJwUy1onUUiaQcRAa4gdl37okY=
-github.com/hrfee/mpris2client v0.0.0-20210115213010-244c4cd6a569 h1:aCHzdXajnRUeaaW9FHzunrjGcRqmyFedwO0ODJRAdBk=
-github.com/hrfee/mpris2client v0.0.0-20210115213010-244c4cd6a569/go.mod h1:tVpzzAlsljmQevNA4mJwUy1onUUiaQcRAa4gdl37okY=
-github.com/hrfee/mpris2client v0.0.2 h1:AqsDoJCKyKjSGwVk3sJ5fjx+7M0tsSueZbVUIDxS1xI=
-github.com/hrfee/mpris2client v0.0.2/go.mod h1:tVpzzAlsljmQevNA4mJwUy1onUUiaQcRAa4gdl37okY=
-github.com/hrfee/mpris2client v0.0.4 h1:2WnCkTWGBr1eg3qHFjxDo7hIeCeQWh3jJ0hFJSts9Ks=
-github.com/hrfee/mpris2client v0.0.4/go.mod h1:tVpzzAlsljmQevNA4mJwUy1onUUiaQcRAa4gdl37okY=
 github.com/hrfee/mpris2client v0.0.5 h1:h3gcb8Q68i6SfcEgOxL9cXcGee9ekvxXltrUxGwRLDU=
 github.com/hrfee/mpris2client v0.0.5/go.mod h1:tVpzzAlsljmQevNA4mJwUy1onUUiaQcRAa4gdl37okY=
 github.com/spf13/pflag v1.0.5 h1:iy+VFUOCP1a+8yFto/drg2CJ5u0yRoB7fZw3DKv/JXA=
 github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
 golang.org/x/sys v0.0.0-20191005200804-aed5e4c7ecf9/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20200928205150-006507a75852 h1:sXxgOAXy8JwHhZnPuItAlUtwIlxrlEqi28mKhUR+zZY=
-golang.org/x/sys v0.0.0-20200928205150-006507a75852/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20201116194326-cc9327a14d48 h1:AYCWBZhgIw6XobZ5CibNJr0Rc4ZofGGKvWa1vcx2IGk=
-golang.org/x/sys v0.0.0-20201116194326-cc9327a14d48/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210113181707-4bcb84eeeb78 h1:nVuTkr9L6Bq62qpUqKo/RnZCFfzDBL0bYo6w9OJUqZY=
 golang.org/x/sys v0.0.0-20210113181707-4bcb84eeeb78/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-gopkg.in/fsnotify.v1 v1.4.7 h1:xOHLXZwVvI9hhs+cLKq5+I5onOuwQLhQwiu63xxlHs4=
-gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
-gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 h1:uRGJdciOHaEIrze2W8Q3AKkepLTh2hOroT7a+7czfdQ=
-gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=

main.go

@@ -1,18 +1,18 @@
 package main
 
 import (
-	"encoding/json"
 	"fmt"
 	"io"
 	"log"
 	"net"
 	"os"
 	"os/signal"
+	"strconv"
 	"strings"
 	"time"
 
+	"github.com/fsnotify/fsnotify"
 	"github.com/godbus/dbus/v5"
-	"github.com/hpcloud/tail"
 	mpris2 "github.com/hrfee/mpris2client"
 	flag "github.com/spf13/pflag"
 )
@@ -21,7 +21,8 @@ import (
 const (
 	SOCK     = "/tmp/waybar-mpris.sock"
 	LOGFILE  = "/tmp/waybar-mpris.log"
-	OUTFILE = "/tmp/waybar-mpris.out"
+	OUTFILE  = "/tmp/waybar-mpris.out"      // Used for sharing waybar output when args are the same.
+	DATAFILE = "/tmp/waybar-mpris.data.out" // Used for sharing "\n"-separated player data between instances when args are different.
 	POLL     = 1
 )
 
@@ -37,24 +38,137 @@ var (
 	SHOW_POS                          = false
 	INTERPOLATE                       = false
 	REPLACE                           = false
+	isSharing                         = false
+	isDataSharing                     = false
 	WRITER                  io.Writer = os.Stdout
+	SHAREWRITER, DATAWRITER io.Writer
 )
 
+const (
+	cPlayerNext     = "pn"
+	cPlayerPrev     = "pp"
+	cNext           = "mn"
+	cPrev           = "mp"
+	cToggle         = "mt"
+	cList           = "ls"
+	cShare          = "sh"
+	cPreShare       = "ps"
+	cDataShare      = "ds"
+	rSuccess        = "sc"
+	rInvalidCommand = "iv"
+	rFailed         = "fa"
+)
+
+func stringToCmd(str string) string {
+	switch str {
+	case "player-next":
+		return cPlayerNext
+	case "player-prev":
+		return cPlayerPrev
+	case "next":
+		return cNext
+	case "prev":
+		return cPrev
+	case "toggle":
+		return cToggle
+	case "list":
+		return cList
+	case "share":
+		return cShare
+	case "data-share":
+		return cDataShare
+	case "pre-share":
+		return cPreShare
+	}
+	return ""
+}
+
+// length-µS\nposition-µS\nplaying (0 or 1)\nartist\nalbum\ntitle\nplayer\n
+func fromData(p *player, cmd string) {
+	p.Duplicate = true
+	values := make([]string, 7)
+	prev := 0
+	current := 0
+	for i := range cmd {
+		if current == len(values) {
+			break
+		}
+		if cmd[i] == '\n' {
+			values[current] = cmd[prev:i]
+			prev = i + 1
+			current++
+		}
+	}
+	l, err := strconv.ParseInt(values[0], 10, 64)
+	if err != nil {
+		l = -1
+	}
+	p.Length = int(l) / 1000000
+	pos, err := strconv.ParseInt(values[1], 10, 64)
+	if err != nil {
+		pos = -1
+	}
+	p.Position = pos
+
+	if values[2] == "1" {
+		p.Playing = true
+	} else {
+		p.Playing = false
+	}
+	p.Artist = values[3]
+	p.Album = values[4]
+	p.Title = values[5]
+	p.Name = values[6]
+}
+
+func toData(p *player) (cmd string) {
+	cmd += strconv.FormatInt(int64(p.Length*1000000), 10) + "\n"
+	cmd += strconv.FormatInt(p.Position, 10) + "\n"
+	if p.Playing {
+		cmd += "1"
+	} else {
+		cmd += "0"
+	}
+	cmd += "\n"
+	cmd += p.Artist + "\n"
+	cmd += p.Album + "\n"
+	cmd += p.Title + "\n"
+	cmd += p.Name + "\n"
+	return
+}
+
+type player struct {
+	*mpris2.Player
+	Duplicate bool
+}
+
+func secondsToString(seconds int) string {
+	minutes := int(seconds / 60)
+	seconds -= int(minutes * 60)
+	return fmt.Sprintf("%02d:%02d", minutes, seconds)
+}
+
 // JSON returns json for waybar to consume.
-func playerJSON(p *mpris2.Player) string {
-	data := map[string]string{}
+func playerJSON(p *player) string {
 	symbol := PLAY
-	data["class"] = "paused"
+	out := "{\"class\": \""
 	if p.Playing {
 		symbol = PAUSE
-		data["class"] = "playing"
+		out += "playing"
+	} else {
+		out += "paused"
 	}
 	var pos string
 	if SHOW_POS {
+		if !p.Duplicate {
 			pos = p.StringPosition()
 			if pos != "" {
 				pos = "(" + pos + ")"
 			}
+		} else {
+			pos = "(" + secondsToString(int(p.Position/1000000)) + "/" + secondsToString(p.Length) + ")"
+
+		}
 	}
 	var items []string
 	order := strings.Split(ORDER, ":")
@@ -78,6 +192,10 @@ func playerJSON(p *mpris2.Player) string {
 			if pos != "" && SHOW_POS {
 				items = append(items, pos)
 			}
+		case "PLAYER":
+			if p.Name != "" {
+				items = append(items, p.Name)
+			}
 		}
 	}
 	if len(items) == 0 {
@@ -95,21 +213,22 @@ func playerJSON(p *mpris2.Player) string {
 		}
 		text += v + right
 	}
-
-	data["tooltip"] = fmt.Sprintf(
-		"%s\nby %s\n",
-		strings.ReplaceAll(p.Title, "&", "&"),
-		strings.ReplaceAll(p.Artist, "&", "&"))
+	out += "\",\"text\":\"" + text + "\","
+	out += "\"tooltip\":\"" + strings.ReplaceAll(p.Title, "&", "&") + "\\n"
+	if p.Artist != "" {
+		out += "by " + strings.ReplaceAll(p.Artist, "&", "&") + "\\n"
+	}
 	if p.Album != "" {
-		data["tooltip"] += "from " + strings.ReplaceAll(p.Album, "&", "&") + "\n"
+		out += "from " + strings.ReplaceAll(p.Album, "&", "&") + "\\n"
 	}
-	data["tooltip"] += "(" + p.Name + ")"
-	data["text"] = text
-	out, err := json.Marshal(data)
-	if err != nil {
-		return "{}"
-	}
-	return string(out)
+	out += "(" + p.Name + ")\"}"
+	return out
+	// return fmt.Sprintf("{\"class\":\"%s\",\"text\":\"%s\",\"tooltip\":\"%s\"}", data["class"], data["text"], data["tooltip"])
+	// out, err := json.Marshal(data)
+	// if err != nil {
+	// 	return "{}"
+	// }
+	// return string(out)
 }
 
 type players struct {
@@ -118,7 +237,7 @@ type players struct {
 
 func (pl *players) JSON() string {
 	if len(pl.mpris2.List) != 0 {
-		return playerJSON(pl.mpris2.List[pl.mpris2.Current])
+		return playerJSON(&player{pl.mpris2.List[pl.mpris2.Current], false})
 	}
 	return "{}"
 }
@@ -129,38 +248,18 @@ func (pl *players) Prev() { pl.mpris2.List[pl.mpris2.Current].Previous() }
 
 func (pl *players) Toggle() { pl.mpris2.List[pl.mpris2.Current].Toggle() }
 
-func main() {
-	logfile, err := os.OpenFile(LOGFILE, os.O_CREATE|os.O_APPEND|os.O_RDWR, 0666)
-	if err != nil {
-		log.Fatalf("Couldn't open %s for writing: %s", LOGFILE, err)
-	}
-	mw := io.MultiWriter(logfile, os.Stdout)
-	log.SetOutput(mw)
-	flag.StringVar(&PLAY, "play", PLAY, "Play symbol/text to use.")
-	flag.StringVar(&PAUSE, "pause", PAUSE, "Pause symbol/text to use.")
-	flag.StringVar(&SEP, "separator", SEP, "Separator string to use between artist, album, and title.")
-	flag.StringVar(&ORDER, "order", ORDER, "Element order.")
-	flag.BoolVar(&AUTOFOCUS, "autofocus", AUTOFOCUS, "Auto switch to currently playing music players.")
-	flag.BoolVar(&SHOW_POS, "position", SHOW_POS, "Show current position between brackets, e.g (04:50/05:00)")
-	flag.BoolVar(&INTERPOLATE, "interpolate", INTERPOLATE, "Interpolate track position (helpful for players that don't update regularly, e.g mpDris2)")
-	flag.BoolVar(&REPLACE, "replace", REPLACE, "replace existing waybar-mpris if found. When false, new instance will clone the original instances output.")
-	var command string
-	flag.StringVar(&command, "send", "", "send command to already runnning waybar-mpris instance. (options: "+strings.Join(COMMANDS, "/")+")")
-
-	flag.Parse()
-	os.Stderr = logfile
-
-	if command != "" {
+func execCommand(cmd string) {
 	conn, err := net.Dial("unix", SOCK)
 	if err != nil {
 		log.Fatalln("Couldn't dial:", err)
 	}
-		_, err = conn.Write([]byte(command))
+	shortCmd := stringToCmd(cmd)
+	_, err = conn.Write([]byte(shortCmd))
 	if err != nil {
 		log.Fatalln("Couldn't send command")
 	}
 	fmt.Println("Sent.")
-		if command == "list" {
+	if cmd == "list" {
 		buf := make([]byte, 512)
 		nr, err := conn.Read(buf)
 		if err != nil {
@@ -171,71 +270,150 @@ func main() {
 		fmt.Printf(response)
 	}
 	os.Exit(0)
-	}
-	// fmt.Println("New array", players)
-	// Start command listener
-	if _, err := os.Stat(SOCK); err == nil {
-		if REPLACE {
-			fmt.Printf("Socket %s already exists, this could mean waybar-mpris is already running.\nStarting this instance will overwrite the file, possibly stopping other instances from accepting commands.\n", SOCK)
-			var input string
-			ignoreChoice := false
-			fmt.Printf("Continue? [y/n]: ")
-			go func() {
-				fmt.Scanln(&input)
-				if strings.Contains(input, "y") && !ignoreChoice {
-					os.Remove(SOCK)
-				}
-			}()
-			time.Sleep(5 * time.Second)
-			if input == "" {
-				fmt.Printf("\nRemoving due to lack of input.\n")
-				ignoreChoice = true
-				// os.Remove(SOCK)
-			}
-		} else if conn, err := net.Dial("unix", SOCK); err == nil {
-			// When waybar-mpris is already running, we attach to its output instead of launching a whole new instance.
+}
+
+func duplicateOutput() error {
 	// Print to stderr to avoid errors from waybar
 	os.Stderr.WriteString("waybar-mpris is already running. This instance will clone its output.")
+
+	conn, err := net.Dial("unix", SOCK)
 	if err != nil {
-				log.Fatalln("Couldn't dial:", err)
+		return err
 	}
-			_, err = conn.Write([]byte("share"))
+	_, err = conn.Write([]byte(cPreShare))
 	if err != nil {
-				log.Fatalln("Couldn't send command")
+		log.Fatalf("Couldn't send command: %v", err)
+		return err
 	}
 	buf := make([]byte, 512)
 	nr, err := conn.Read(buf)
 	if err != nil {
-				log.Fatalln("Couldn't read response.")
+		log.Fatalf("Couldn't read response: %v", err)
+		return err
+	}
+	argString := ""
+	for _, arg := range os.Args {
+		argString += arg + "|"
+	}
+	conn.Close()
+	conn, err = net.Dial("unix", SOCK)
+	if err != nil {
+		return err
+	}
+	if string(buf[0:nr]) == argString {
+		// Tell other instance to share output in OUTFILE
+		_, err := conn.Write([]byte(cShare))
+		if err != nil {
+			log.Fatalf("Couldn't send command: %v", err)
+		}
+		buf = make([]byte, 2)
+		nr, err := conn.Read(buf)
+		if err != nil {
+			log.Fatalf("Couldn't read response: %v", err)
+		}
+		if resp := string(buf[0:nr]); resp == rSuccess {
+			// t, err := tail.TailFile(OUTFILE, tail.Config{
+			// 	Follow:    true,
+			// 	MustExist: true,
+			// 	Logger:    tail.DiscardingLogger,
+			// })
+			// if err == nil {
+			// 	for line := range t.Lines {
+			// 		fmt.Println(line.Text)
+			// 	}
+			// }
+			f, err := os.Open(OUTFILE)
+			if err != nil {
+				log.Fatalf("Failed to open \"%s\": %v", OUTFILE, err)
+			}
+			watcher, err := fsnotify.NewWatcher()
+			if err != nil {
+				log.Fatalf("Failed to start watcher: %v", err)
+			}
+			defer watcher.Close()
+			err = watcher.Add(OUTFILE)
+			if err != nil {
+				log.Fatalf("Failed to watch file: %v", err)
+			}
+			for {
+				select {
+				case event, ok := <-watcher.Events:
+					if !ok {
+						log.Printf("Watcher failed: %v", err)
+						return err
+					}
+					if event.Op&fsnotify.Write == fsnotify.Write {
+						l, err := io.ReadAll(f)
+						if err != nil {
+							log.Printf("Failed to read file: %v", err)
+							return err
+						}
+						str := string(l)
+						// Trim extra newline is necessary
+						if str[len(str)-2:] == "\n\n" {
+							fmt.Print(str[:len(str)-1])
+						} else {
+							fmt.Print(str)
+						}
+						f.Seek(0, 0)
 					}
-			if string(buf[0:nr]) == "success" {
-				t, err := tail.TailFile(OUTFILE, tail.Config{
-					Follow:    true,
-					MustExist: true,
-					Logger:    tail.DiscardingLogger,
-				})
-				if err == nil {
-					for line := range t.Lines {
-						fmt.Println(line.Text)
 				}
 			}
 		}
 	} else {
-			os.Remove(SOCK)
-			os.Remove(OUTFILE)
-		}
-	}
-	conn, err := dbus.SessionBus()
+		_, err := conn.Write([]byte(cDataShare))
 		if err != nil {
-		log.Fatalln("Error connecting to DBus:", err)
+			log.Fatalf("Couldn't send command: %v", err)
 		}
-	players := &players{
-		mpris2: mpris2.NewMpris2(conn, INTERPOLATE, POLL, AUTOFOCUS),
+		buf = make([]byte, 2)
+		nr, err := conn.Read(buf)
+		if err != nil {
+			log.Fatalf("Couldn't read response: %v", err)
 		}
-	players.mpris2.Reload()
-	players.mpris2.Sort()
-	lastLine := ""
-	go func() {
+		if resp := string(buf[0:nr]); resp == rSuccess {
+			f, err := os.Open(DATAFILE)
+			if err != nil {
+				log.Fatalf("Failed to open \"%s\": %v", DATAFILE, err)
+			}
+			watcher, err := fsnotify.NewWatcher()
+			if err != nil {
+				log.Fatalf("Failed to start watcher: %v", err)
+			}
+			defer watcher.Close()
+			err = watcher.Add(DATAFILE)
+			if err != nil {
+				log.Fatalf("Failed to watch file: %v", err)
+			}
+			p := &player{
+				&mpris2.Player{},
+				true,
+			}
+			for {
+				select {
+				case event, ok := <-watcher.Events:
+					if !ok {
+						log.Printf("Watcher failed: %v", err)
+						return err
+					}
+					if event.Op&fsnotify.Write == fsnotify.Write {
+						l, err := io.ReadAll(f)
+						if err != nil {
+							log.Printf("Failed to read file: %v", err)
+							return err
+						}
+						str := string(l)
+						fromData(p, str)
+						fmt.Fprintln(WRITER, playerJSON(p))
+						f.Seek(0, 0)
+					}
+				}
+			}
+		}
+	}
+	return nil
+}
+
+func listenForCommands(players *players) {
 	listener, err := net.Listen("unix", SOCK)
 	c := make(chan os.Signal, 1)
 	signal.Notify(c, os.Interrupt)
@@ -258,7 +436,7 @@ func main() {
 			log.Println("Couldn't accept:", err)
 			continue
 		}
-			buf := make([]byte, 512)
+		buf := make([]byte, 2)
 		nr, err := con.Read(buf)
 		if err != nil {
 			log.Println("Couldn't read:", err)
@@ -266,7 +444,7 @@ func main() {
 		}
 		command := string(buf[0:nr])
 		switch command {
-			case "player-next":
+		case cPlayerNext:
 			length := len(players.mpris2.List)
 			if length != 1 {
 				if players.mpris2.Current < uint(length-1) {
@@ -276,7 +454,7 @@ func main() {
 				}
 				players.mpris2.Refresh()
 			}
-			case "player-prev":
+		case cPlayerPrev:
 			length := len(players.mpris2.List)
 			if length != 1 {
 				if players.mpris2.Current != 0 {
@@ -286,26 +464,149 @@ func main() {
 				}
 				players.mpris2.Refresh()
 			}
-			case "next":
+		case cNext:
 			players.Next()
-			case "prev":
+		case cPrev:
 			players.Prev()
-			case "toggle":
+		case cToggle:
 			players.Toggle()
-			case "list":
+		case cList:
 			con.Write([]byte(players.mpris2.String()))
-			case "share":
-				out, err := os.Create(OUTFILE)
+		case cDataShare:
+			if !isDataSharing {
+				f, err := os.OpenFile(DATAFILE, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0666)
+				defer f.Close()
 				if err != nil {
-					con.Write([]byte(fmt.Sprintf("Failed: %s", err)))
+					fmt.Fprintf(con, "Failed: %v", err)
 				}
-				WRITER = io.MultiWriter(os.Stdout, out)
-				con.Write([]byte("success"))
+				DATAWRITER = dataWrite{
+					emptyEveryWrite{file: f},
+					players,
+				}
+				if isSharing {
+					WRITER = io.MultiWriter(SHAREWRITER, DATAWRITER, os.Stdout)
+				} else {
+					WRITER = io.MultiWriter(DATAWRITER, os.Stdout)
+				}
+				isDataSharing = true
+			}
+			fmt.Fprint(con, rSuccess)
+		case cShare:
+			if !isSharing {
+				f, err := os.OpenFile(OUTFILE, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0666)
+				defer f.Close()
+				if err != nil {
+					fmt.Fprintf(con, "Failed: %v", err)
+				}
+				SHAREWRITER = emptyEveryWrite{file: f}
+				if isDataSharing {
+					WRITER = io.MultiWriter(SHAREWRITER, DATAWRITER, os.Stdout)
+				} else {
+					WRITER = io.MultiWriter(SHAREWRITER, os.Stdout)
+				}
+				isSharing = true
+			}
+			fmt.Fprint(con, rSuccess)
+		/* Prior to sharing, the first instance sends its os.Args.
+		If the second instances args are different, the first sends the raw data (artist, album, etc.)
+		If they are the same, the first instance just sends its output and the second prints it. */
+		case cPreShare:
+			out := ""
+			for _, arg := range os.Args {
+				out += arg + "|"
+			}
+			con.Write([]byte(out))
 		default:
 			fmt.Println("Invalid command")
 		}
+		con.Close()
+	}
+}
+
+type dataWrite struct {
+	emptyEveryWrite
+	Players *players
+}
+
+func (w dataWrite) Write(p []byte) (n int, err error) {
+	line := toData(&player{w.Players.mpris2.List[w.Players.mpris2.Current], true})
+	return w.emptyEveryWrite.Write([]byte(line))
+}
+
+type emptyEveryWrite struct {
+	file *os.File
+}
+
+func (w emptyEveryWrite) Write(p []byte) (n int, err error) {
+	offset, err := w.file.Seek(0, 0)
+	if err != nil {
+		return 0, err
+	}
+	return w.file.WriteAt(p, offset)
+}
+
+func main() {
+	logfile, err := os.OpenFile(LOGFILE, os.O_CREATE|os.O_APPEND|os.O_RDWR, 0666)
+	if err != nil {
+		log.Fatalf("Couldn't open %s for writing: %s", LOGFILE, err)
+	}
+	mw := io.MultiWriter(logfile, os.Stdout)
+	log.SetOutput(mw)
+	flag.StringVar(&PLAY, "play", PLAY, "Play symbol/text to use.")
+	flag.StringVar(&PAUSE, "pause", PAUSE, "Pause symbol/text to use.")
+	flag.StringVar(&SEP, "separator", SEP, "Separator string to use between artist, album, and title.")
+	flag.StringVar(&ORDER, "order", ORDER, "Element order. An extra \"PLAYER\" element is also available.")
+	flag.BoolVar(&AUTOFOCUS, "autofocus", AUTOFOCUS, "Auto switch to currently playing music players.")
+	flag.BoolVar(&SHOW_POS, "position", SHOW_POS, "Show current position between brackets, e.g (04:50/05:00)")
+	flag.BoolVar(&INTERPOLATE, "interpolate", INTERPOLATE, "Interpolate track position (helpful for players that don't update regularly, e.g mpDris2)")
+	flag.BoolVar(&REPLACE, "replace", REPLACE, "replace existing waybar-mpris if found. When false, new instance will clone the original instances output.")
+	var command string
+	flag.StringVar(&command, "send", "", "send command to already runnning waybar-mpris instance. (options: "+strings.Join(COMMANDS, "/")+")")
+
+	flag.Parse()
+	os.Stderr = logfile
+
+	if command != "" {
+		execCommand(command)
+	}
+	// fmt.Println("New array", players)
+	// Start command listener
+	if _, err := os.Stat(SOCK); err == nil {
+		if REPLACE {
+			fmt.Printf("Socket %s already exists, this could mean waybar-mpris is already running.\nStarting this instance will overwrite the file, possibly stopping other instances from accepting commands.\n", SOCK)
+			var input string
+			ignoreChoice := false
+			fmt.Printf("Continue? [y/n]: ")
+			go func() {
+				fmt.Scanln(&input)
+				if strings.Contains(input, "y") && !ignoreChoice {
+					os.Remove(SOCK)
 				}
 			}()
+			time.Sleep(5 * time.Second)
+			if input == "" {
+				fmt.Printf("\nRemoving due to lack of input.\n")
+				ignoreChoice = true
+				// os.Remove(SOCK)
+			}
+			// When waybar-mpris is already running, we attach to its output instead of launching a whole new instance.
+		} else if err := duplicateOutput(); err != nil {
+			os.Stdout.WriteString("Couldn't dial socket, deleting instead: " + err.Error())
+			os.Remove(SOCK)
+			os.Remove(OUTFILE)
+		}
+	}
+	conn, err := dbus.SessionBus()
+	if err != nil {
+		log.Fatalln("Error connecting to DBus:", err)
+	}
+	players := &players{
+		mpris2: mpris2.NewMpris2(conn, INTERPOLATE, POLL, AUTOFOCUS),
+	}
+	players.mpris2.Reload()
+	players.mpris2.Sort()
+	lastLine := ""
+	go listenForCommands(players)
 	go players.mpris2.Listen()
 	if SHOW_POS {
 		go func() {