Initial Commit

pkg/player/pactl.go

@@ -0,0 +1,16 @@
+package player
+
+import (
+	"fmt"
+	"os/exec"
+)
+
+// VolUp uses pactl to increase the volume of the default sink
+func VolUp(percent uint) error {
+	return exec.Command("pactl", "set-sink-volume", "@DEFAULT_SINK@", fmt.Sprintf("+%d%%", percent)).Run()
+}
+
+// VolDown uses pactl to decrease the volume of the default sink
+func VolDown(percent uint) error {
+	return exec.Command("pactl", "set-sink-volume", "@DEFAULT_SINK@", fmt.Sprintf("-%d%%", percent)).Run()
+}

pkg/player/playerctl.go

@@ -0,0 +1,91 @@
+package player
+
+import (
+	"bufio"
+	"io"
+	"os/exec"
+	"strings"
+)
+
+// Play uses playerctl to play media
+func Play() error {
+	return exec.Command("playerctl", "play").Run()
+}
+
+// Pause uses playerctl to pause media
+func Pause() error {
+	return exec.Command("playerctl", "pause").Run()
+}
+
+// Next uses playerctl to skip to next media
+func Next() error {
+	return exec.Command("playerctl", "next").Run()
+}
+
+// Prev uses playerctl to skip to previous media
+func Prev() error {
+	return exec.Command("playerctl", "previous").Run()
+}
+
+// Metadata uses playerctl to detect music metadata changes
+func Metadata(key string, onChange func(string)) error {
+	// Execute playerctl command with key and follow flag
+	cmd := exec.Command("playerctl", "metadata", key, "-F")
+	// Get stdout pipe
+	stdout, err := cmd.StdoutPipe()
+	if err != nil {
+		return err
+	}
+	go func() {
+		for {
+			// Read line from command stdout
+			line, _, err := bufio.NewReader(stdout).ReadLine()
+			if err == io.EOF {
+				continue
+			}
+			// Convert line to string
+			data := string(line)
+			// If key unknown, return suitable default
+			if data == "No player could handle this command" || data == "" {
+				data = "Unknown " + strings.Title(key)
+			}
+			// Run the onChange callback
+			onChange(data)
+		}
+	}()
+	// Start command asynchronously
+	err = cmd.Start()
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func Status(onChange func(bool)) error {
+	// Execute playerctl status with follow flag
+	cmd := exec.Command("playerctl", "status", "-F")
+	// Get stdout pipe
+	stdout, err := cmd.StdoutPipe()
+	if err != nil {
+		return err
+	}
+	go func() {
+		for {
+			// Read line from command stdout
+			line, _, err := bufio.NewReader(stdout).ReadLine()
+			if err == io.EOF {
+				continue
+			}
+			// Convert line to string
+			data := string(line)
+			// Run the onChange callback
+			onChange(data == "Playing")
+		}
+	}()
+	// Start command asynchronously
+	err = cmd.Start()
+	if err != nil {
+		return err
+	}
+	return nil
+}