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package main
import (
"fmt"
"net"
"syscall"
"strings"
"strconv"
"os"
"os/exec"
"io/ioutil"
"time"
"github.com/BurntSushi/toml"
)
type Config struct {
Sections []string
Delay int
Separator string
IP IPConfig
Mounts MountConfig
Music MusicConfig
Clock ClockConfig
}
type IPConfig struct {
Label string
Interfaces []string
IPv4Only bool `toml:"ipv4only"`
}
type MountConfig struct {
Label string
MountPoints []string `toml:"mountpoints"`
}
type MusicConfig struct {
LabelPlaying string `toml:"labelplaying"`
LabelPaused string `toml:"labelpaused"`
LabelStopped string `toml:"labelstopped"`
}
type ClockConfig struct {
Label string
Format string
}
func diskSizes(mounts []string) string {
var b strings.Builder
var statfs syscall.Statfs_t
const div = float64(1024 * 1024 * 1024)
const unit = "G"
sep := ""
for _, mount := range mounts {
b.WriteString(sep)
err := syscall.Statfs(mount, &statfs)
if err != nil {
panic(err)
}
availBytes := float64(statfs.Bavail * uint64(statfs.Bsize))
avail := strconv.FormatFloat(availBytes / div, 'f', 2, 64)
b.WriteString(fmt.Sprintf("%v : %v %v", mount, avail, unit))
sep = " "
}
return b.String()
}
func ips(interfaces []string, IPv4Only bool) string {
var b strings.Builder
sep := ""
for _, interfaceName := range interfaces {
b.WriteString(sep)
b.WriteString(interfaceName)
b.WriteString(": ")
if len(interfaces) > 1 {
b.WriteString(" [")
}
b.WriteString(ip(interfaceName, IPv4Only))
if len(interfaces) > 1 {
b.WriteString(" ]")
}
sep = " "
}
return b.String()
}
func ip(interfaceName string, IPv4Only bool) string {
var b strings.Builder
sep := ""
in, err := net.InterfaceByName(interfaceName)
if err != nil {
panic(err)
}
addrs, err := in.Addrs()
if err != nil {
panic(err)
}
for _, addr := range addrs {
var ip net.IP
switch v := addr.(type) {
case *net.IPAddr:
ip = v.IP
case *net.IPNet:
ip = v.IP
default:
}
if IPv4Only {
if ip.To4() != nil {
b.WriteString(sep)
b.WriteString(ip.String())
sep = " "
}
} else {
b.WriteString(sep)
b.WriteString(ip.String())
sep = " "
}
}
return b.String()
}
func clock(format string) string {
t := time.Now()
return t.Format(format)
}
func nowPlayingMPD() string {
cmd := exec.Command("mpc", "current")
out, err := cmd.Output()
if err != nil {
panic(err)
}
sOut := string(out)
sOut = strings.ReplaceAll(sOut, "\n", "")
return sOut
}
// Returns 0 if playing, 1 if paused and 2 if stopped
func statusMPD() int {
cmd := exec.Command("mpc", "status")
out, err := cmd.Output()
if err != nil {
return -1
}
sOut := string(out)
if strings.Contains(sOut, "playing") {
return 0
} else if strings.Contains(sOut, "paused") {
return 1
} else {
return 2
}
}
func buildClock(config Config) string {
var b strings.Builder
b.WriteString(config.Clock.Label)
b.WriteString(clock(config.Clock.Format))
return b.String()
}
func buildIP(config Config) string {
var b strings.Builder
b.WriteString(config.IP.Label)
b.WriteString("[ ")
b.WriteString(ips(config.IP.Interfaces, config.IP.IPv4Only))
b.WriteString(" ]")
return b.String()
}
func buildMounts(config Config) string {
var b strings.Builder
b.WriteString(config.Mounts.Label)
b.WriteString("[ ")
b.WriteString(diskSizes(config.Mounts.MountPoints))
b.WriteString(" ]")
return b.String()
}
func buildMusic(config Config) string {
var b strings.Builder
isMPD := true
switch statusMPD() {
case 0:
b.WriteString(config.Music.LabelPlaying)
case 1:
b.WriteString(config.Music.LabelPaused)
case 2:
b.WriteString(config.Music.LabelStopped)
default:
isMPD = false
}
if isMPD {
b.WriteString(nowPlayingMPD())
b.WriteString(config.Separator)
}
return b.String()
}
func main() {
var configPath = "/etc/statusbar.conf"
var content []byte
var err error
if _, err := os.Stat(configPath); err != nil {
content, err = ioutil.ReadAll(os.Stdin)
} else {
content, err = ioutil.ReadFile(configPath)
}
if err != nil {
panic(err)
}
var config Config
_, err = toml.Decode(string(content), &config)
if err != nil {
panic(err)
}
for true {
var b strings.Builder
for i, section := range config.Sections {
switch section {
case "clock":
b.WriteString(buildClock(config))
case "ip":
b.WriteString(buildIP(config))
case "mounts":
b.WriteString(buildMounts(config))
case "music":
b.WriteString(buildMusic(config))
default:
}
if i < len(config.Sections) - 1 {
b.WriteString(config.Separator)
}
}
fmt.Println(b.String())
time.Sleep(time.Duration(config.Delay) * time.Second)
}
}
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