Add AudioPlayer provider

Signed-off-by: AKP <tom@tdpain.net>

cmd/bar/main.go

@@ -51,6 +51,7 @@ func run() error {
 	}
 
 	blocks := []i3bar.BlockGenerator{
+		providers.NewAudioPlayer(32),
 		providers.NewIPAddress("wlp0s20f3"),
 		providers.NewWiFi("wlp0s20f3", 75),
 		providers.NewBattery("BAT0", 80, 30, 20),

internal/providers/audioPlayer.go

@@ -0,0 +1,104 @@
+package providers
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/codemicro/bar/internal/i3bar"
+)
+
+const (
+	musicNoteString     = "♪"
+	playerctlExecutable = "playerctl"
+
+	playerStatusStopped = "Stopped"
+	playerStatusPlaying = "Playing"
+	playerStatusPaused  = "Paused"
+	playerStatusUnknown = "Unknown"
+)
+
+type AudioPlayer struct {
+	ShowTextOnPause bool
+	MaxLabelLen     int
+}
+
+func NewAudioPlayer(maxLabelLength int) *AudioPlayer {
+	return &AudioPlayer{
+		MaxLabelLen: maxLabelLength,
+	}
+}
+
+type playingAudioInfo struct {
+	Track  string
+	Artist string
+	Album  string
+	Status string
+}
+
+func (g *AudioPlayer) getInfo() (*playingAudioInfo, error) {
+	rawMetadataOutput, err := runCommand(playerctlExecutable, "metadata")
+	if err != nil {
+		return nil, err
+	}
+
+	info := new(playingAudioInfo)
+
+	lines := strings.Split(string(rawMetadataOutput), "\n")
+	for _, line := range lines {
+		splitLine := strings.Fields(line)
+
+		if len(splitLine) < 3 {
+			continue
+		}
+
+		var (
+			// application = splitLine[0]
+			fieldName = splitLine[1]
+			data      = strings.Join(splitLine[2:], " ")
+		)
+
+		switch strings.ToLower(fieldName) {
+		case "xesam:artist":
+			info.Artist = data
+		case "xesam:title":
+			info.Track = data
+		case "xesam:album":
+			info.Album = data
+		}
+	}
+
+	rawStatusOutput, err := runCommand(playerctlExecutable, "status")
+	if err != nil {
+		return nil, err
+	}
+
+	if x := string(rawStatusOutput); !(x == playerStatusStopped || x == playerStatusPlaying || x == playerStatusPaused) {
+		info.Status = playerStatusUnknown
+	} else {
+		info.Status = x
+	}
+
+	return info, nil
+}
+
+func (g *AudioPlayer) Block(colors *i3bar.ColorSet) (*i3bar.Block, error) {
+	info, err := g.getInfo()
+	if err != nil {
+		return nil, err
+	}
+
+	b := new(i3bar.Block)
+	b.Name = "audioPlayer"
+
+	b.FullText = musicNoteString
+
+	if info.Status == playerStatusPlaying || (info.Status == playerStatusPaused && g.ShowTextOnPause) {
+		x := fmt.Sprintf("%s - %s", info.Track, info.Artist)
+		if len(x) > g.MaxLabelLen {
+			x = x[:g.MaxLabelLen] + "..."
+		}
+		b.FullText += " " + x
+	}
+
+	return b, nil
+}

internal/providers/providers.go

@@ -1,6 +1,7 @@
 package providers
 
 import (
+	"bytes"
 	"fmt"
 	"os/exec"
 	"strings"
@@ -12,5 +13,5 @@ func runCommand(program string, args ...string) ([]byte, error) {
 	if err != nil {
 		err = fmt.Errorf(`failed to execute "%v" (%+v)`, strings.Join(append([]string{program}, args...), " "), err)
 	}
-	return out, err
+	return bytes.TrimSpace(out), err
 }