hrfee/waybar-mpris
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overwrite previous content when sharing output

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this way /tmp/waybar-mpris.out won't get filled up.
This commit is contained in:
Harvey Tindall 2021-04-24 16:02:39 +01:00
parent 16465c44a2
commit c235dd60dd
Signed by: hrfee
GPG Key ID: BBC65952848FB1A2
4 changed files with 185 additions and 140 deletions
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5
go.mod
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@ -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
)

18
go.sum
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@ -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=

302
main.go
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@ -11,8 +11,8 @@ import (
"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"
)
@ -37,6 +37,7 @@ var (
SHOW_POS = false
INTERPOLATE = false
REPLACE = false
isSharing = false
WRITER io.Writer = os.Stdout
)
@ -129,6 +130,182 @@ func (pl *players) Prev() { pl.mpris2.List[pl.mpris2.Current].Previous() }
func (pl *players) Toggle() { pl.mpris2.List[pl.mpris2.Current].Toggle() }
func execCommand(cmd string) {
conn, err := net.Dial("unix", SOCK)
if err != nil {
log.Fatalln("Couldn't dial:", err)
}
_, err = conn.Write([]byte(cmd))
if err != nil {
log.Fatalln("Couldn't send command")
}
fmt.Println("Sent.")
if cmd == "list" {
buf := make([]byte, 512)
nr, err := conn.Read(buf)
if err != nil {
log.Fatalln("Couldn't read response.")
}
response := string(buf[0:nr])
fmt.Println("Response:")
fmt.Printf(response)
}
os.Exit(0)
}
func duplicateOutput(conn net.Conn) {
// Print to stderr to avoid errors from waybar
os.Stderr.WriteString("waybar-mpris is already running. This instance will clone its output.")
// Tell other instance to share output in OUTFILE
_, err := conn.Write([]byte("share"))
if err != nil {
log.Fatalf("Couldn't send command: %v", err)
}
buf := make([]byte, 512)
nr, err := conn.Read(buf)
if err != nil {
log.Fatalf("Couldn't read response: %v", err)
}
if resp := string(buf[0:nr]); resp == "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)
// }
// }
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
}
if event.Op&fsnotify.Write == fsnotify.Write {
l, err := io.ReadAll(f)
if err != nil {
log.Printf("Failed to read file: %v", err)
return
}
str := string(l)
if str[len(str)-2:] == "\n\n" {
fmt.Print(str[:len(str)-1])
} else {
fmt.Print(string(l))
}
f.Seek(0, 0)
}
}
}
}
}
func listenForCommands(players *players) {
listener, err := net.Listen("unix", SOCK)
c := make(chan os.Signal, 1)
signal.Notify(c, os.Interrupt)
go func() {
<-c
os.Remove(OUTFILE)
os.Remove(SOCK)
os.Exit(1)
}()
if err != nil {
log.Fatalf("Couldn't establish socket connection at %s (error %s)\n", SOCK, err)
}
defer func() {
listener.Close()
os.Remove(SOCK)
}()
for {
con, err := listener.Accept()
if err != nil {
log.Println("Couldn't accept:", err)
continue
}
buf := make([]byte, 512)
nr, err := con.Read(buf)
if err != nil {
log.Println("Couldn't read:", err)
continue
}
command := string(buf[0:nr])
switch command {
case "player-next":
length := len(players.mpris2.List)
if length != 1 {
if players.mpris2.Current < uint(length-1) {
players.mpris2.Current++
} else {
players.mpris2.Current = 0
}
players.mpris2.Refresh()
}
case "player-prev":
length := len(players.mpris2.List)
if length != 1 {
if players.mpris2.Current != 0 {
players.mpris2.Current--
} else {
players.mpris2.Current = uint(length - 1)
}
players.mpris2.Refresh()
}
case "next":
players.Next()
case "prev":
players.Prev()
case "toggle":
players.Toggle()
case "list":
con.Write([]byte(players.mpris2.String()))
case "share":
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)
}
var out io.Writer = emptyEveryWrite{file: f}
WRITER = io.MultiWriter(os.Stdout, out)
isSharing = true
}
fmt.Fprint(con, "success")
default:
fmt.Println("Invalid command")
}
}
}
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 {
@ -151,26 +328,7 @@ func main() {
os.Stderr = logfile
if command != "" {
conn, err := net.Dial("unix", SOCK)
if err != nil {
log.Fatalln("Couldn't dial:", err)
}
_, err = conn.Write([]byte(command))
if err != nil {
log.Fatalln("Couldn't send command")
}
fmt.Println("Sent.")
if command == "list" {
buf := make([]byte, 512)
nr, err := conn.Read(buf)
if err != nil {
log.Fatalln("Couldn't read response.")
}
response := string(buf[0:nr])
fmt.Println("Response:")
fmt.Printf(response)
}
os.Exit(0)
execCommand(command)
}
// fmt.Println("New array", players)
// Start command listener
@ -194,33 +352,11 @@ func main() {
}
} 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.
// Print to stderr to avoid errors from waybar
os.Stderr.WriteString("waybar-mpris is already running. This instance will clone its output.")
if err != nil {
log.Fatalln("Couldn't dial:", err)
}
_, err = conn.Write([]byte("share"))
if err != nil {
log.Fatalln("Couldn't send command")
}
buf := make([]byte, 512)
nr, err := conn.Read(buf)
if err != nil {
log.Fatalln("Couldn't read response.")
}
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)
}
}
}
duplicateOutput(conn)
} else {
if err != nil {
os.Stdout.WriteString("Couldn't dial socket, deleting instead: " + err.Error())
}
os.Remove(SOCK)
os.Remove(OUTFILE)
}
@ -235,77 +371,7 @@ func main() {
players.mpris2.Reload()
players.mpris2.Sort()
lastLine := ""
go func() {
listener, err := net.Listen("unix", SOCK)
c := make(chan os.Signal, 1)
signal.Notify(c, os.Interrupt)
go func() {
<-c
os.Remove(OUTFILE)
os.Remove(SOCK)
os.Exit(1)
}()
if err != nil {
log.Fatalf("Couldn't establish socket connection at %s (error %s)\n", SOCK, err)
}
defer func() {
listener.Close()
os.Remove(SOCK)
}()
for {
con, err := listener.Accept()
if err != nil {
log.Println("Couldn't accept:", err)
continue
}
buf := make([]byte, 512)
nr, err := con.Read(buf)
if err != nil {
log.Println("Couldn't read:", err)
continue
}
command := string(buf[0:nr])
switch command {
case "player-next":
length := len(players.mpris2.List)
if length != 1 {
if players.mpris2.Current < uint(length-1) {
players.mpris2.Current++
} else {
players.mpris2.Current = 0
}
players.mpris2.Refresh()
}
case "player-prev":
length := len(players.mpris2.List)
if length != 1 {
if players.mpris2.Current != 0 {
players.mpris2.Current--
} else {
players.mpris2.Current = uint(length - 1)
}
players.mpris2.Refresh()
}
case "next":
players.Next()
case "prev":
players.Prev()
case "toggle":
players.Toggle()
case "list":
con.Write([]byte(players.mpris2.String()))
case "share":
out, err := os.Create(OUTFILE)
if err != nil {
con.Write([]byte(fmt.Sprintf("Failed: %s", err)))
}
WRITER = io.MultiWriter(os.Stdout, out)
con.Write([]byte("success"))
default:
fmt.Println("Invalid command")
}
}
}()
go listenForCommands(players)
go players.mpris2.Listen()
if SHOW_POS {
go func() {

BIN
waybar-mpris
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