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sklt.go
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// SKLT is a swaybar status program that outputs current keyboard layout and time.
// Sway has per-device layouts. This program outputs only the last layout that changed.
// When a new device is connected, its initial layout is shown.
// For command line reference, run:
// sklt -h
package main
import (
"bufio"
"bytes"
"encoding/json"
"errors"
"fmt"
"io"
"net"
"os"
"path/filepath"
"strings"
"time"
)
var progName = "sklt"
func usage(e bool) {
var w io.Writer
if e {
w = os.Stderr
} else {
w = os.Stdout
}
fmt.Fprintln(w, "usage:", progName, "[-h] [-t interval] [-f format] [-x translation]")
fmt.Fprintln(w, "\t-h - print this message and exit")
fmt.Fprintln(w, "\t-t interval - time update interval; valid values are (case-insensitive):")
fmt.Fprintln(w, "\t\ts or second")
fmt.Fprintln(w, "\t\tm or minute (default)")
fmt.Fprintln(w, "\t\th or hour")
fmt.Fprintln(w, "\t\td or day (maximum is 1 hour, but \"day\" selects date-only format)")
fmt.Fprintln(w, "\t-f format - time format as understood by Go time package")
fmt.Fprintln(w, "\t\tthat is, how the time \"Mon Jan 2 15:04:05 -0700 MST 2006\" should be formatted")
fmt.Fprintln(w, "\t\tsee https://golang.org/pkg/time/#Time.Format")
fmt.Fprintln(w, "\t\texample: \"2006-01-02 15:04\" (year-month-day hour:minute)")
fmt.Fprintln(w, "\t-x translation - file name of layout name translation table")
fmt.Fprintln(w, "\t\tthe option can be specified multiple times, all files are read")
fmt.Fprintln(w, "\t\teach line in the file must have 2 layout names separated with tab character:")
fmt.Fprintln(w, "\t\t1. original layout name")
fmt.Fprintln(w, "\t\t2. displayed (translated) name")
if e {
os.Exit(1)
}
}
// Keyboards are organized in a doubly linked list in the order of recent layout changes.
type kbdDev struct{ layout, prevDev, nextDev string }
// Monitors Sway keyboard layouts.
type monitor struct {
s net.Conn // Sway IPC socket
ch chan string // layout change notifications
kbds map[string]kbdDev // indexed by device identifiers
trans map[string]string
lastKbd, prevLayout string
}
var tab = []byte{'\t'}
func (self *monitor) loadTranslations(fn string) error {
f, err := os.Open(fn)
if err != nil {
return err
}
defer func() {
if f != nil {
f.Close()
}
}()
s := bufio.NewScanner(f)
var ln int
for s.Scan() {
ln++
l1 := s.Bytes()
l2 := bytes.Split(l1, tab)
switch len(l2) {
case 0:
continue
case 1:
l2 = append(l2, nil)
fallthrough
case 2:
n := string(bytes.TrimSpace(l2[0]))
t := string(bytes.TrimSpace(l2[1]))
if len(n) == 0 {
if len(t) == 0 {
continue
}
break
}
if self.trans == nil {
self.trans = make(map[string]string)
}
if p := self.trans[n]; len(p) > 0 {
if len(t) > 0 && p != t {
fmt.Fprintf(os.Stderr, "duplicate translation for %q: %q and %q\n", n, p, t)
}
continue
}
self.trans[n] = t
continue
}
fmt.Fprintf(os.Stderr, "invalid translation entry in %s line %d: %s\n", fn, ln, l1)
}
err = s.Err()
if err != nil {
return err
}
err = f.Close()
f = nil
return err
}
// Delete a keyboard from the list.
func (self *monitor) del(id string) {
if len(id) == 0 {
return
}
if self.kbds == nil {
return
}
l1 := self.kbds[id]
delete(self.kbds, id)
if len(l1.prevDev) > 0 {
l2 := self.kbds[l1.prevDev]
l2.nextDev = l1.nextDev
self.kbds[l1.prevDev] = l2
}
if len(l1.nextDev) > 0 {
l2 := self.kbds[l1.nextDev]
l2.prevDev = l1.prevDev
self.kbds[l1.nextDev] = l2
}
if self.lastKbd == id {
self.lastKbd = l1.prevDev
}
}
// Set keyboard's layout in the list. If the layout has changed or the identifier is new, put the keyboard at the end of the list.
func (self *monitor) set(id, l string) {
l = strings.TrimSpace(l)
if len(l) == 0 {
self.del(id)
return
}
if self.kbds == nil {
self.kbds = make(map[string]kbdDev)
}
l1 := self.kbds[id]
if l1.layout == l {
return
}
l1.layout = l
if self.lastKbd != id {
if len(l1.prevDev) > 0 {
l2 := self.kbds[l1.prevDev]
l2.nextDev = l1.nextDev
self.kbds[l1.prevDev] = l2
}
if len(l1.nextDev) > 0 {
l2 := self.kbds[l1.nextDev]
l2.prevDev = l1.prevDev
self.kbds[l1.nextDev] = l2
}
l1.prevDev = self.lastKbd
l1.nextDev = ""
self.lastKbd = id
}
self.kbds[id] = l1
}
func (self *monitor) processMsg(t MessageType, payload io.Reader) error {
switch t {
case SUBSCRIBE:
var p struct {
Success bool `json:"success"`
}
err := json.NewDecoder(payload).Decode(&p)
if err != nil {
return err
}
if !p.Success {
return errors.New("failed to subscribe to Sway events")
}
err = WriteEmptyMessage(self.s, GET_INPUTS)
if err != nil {
return err
}
case GET_INPUTS:
var p []InputDevice
err := json.NewDecoder(payload).Decode(&p)
if err != nil {
return err
}
for _, i := range p {
self.set(i.Identifier, i.XkbActiveLayoutName)
}
case InputEvent:
var p InputEventPayload
err := json.NewDecoder(payload).Decode(&p)
if err != nil {
return err
}
switch p.Change {
case "removed":
self.del(p.Input.Identifier)
default:
self.set(p.Input.Identifier, p.Input.XkbActiveLayoutName)
}
}
return nil
}
func (self *monitor) watchLayouts() {
err := WriteJSONMessage(self.s, SUBSCRIBE, []string{"input"})
if err != nil {
fmt.Fprintln(os.Stderr, "failed to send Sway message:", err)
os.Exit(1)
}
for {
err = ReadMessage(self.s, self.processMsg)
if err != nil {
fmt.Fprintln(os.Stderr, "Sway IPC failure:", err)
os.Exit(1)
}
nl := self.kbds[self.lastKbd].layout
if t, ok := self.trans[nl]; ok {
nl = t
}
if self.prevLayout == nl {
continue
}
self.prevLayout = nl
self.ch <- nl
}
}
func timer(interval time.Duration, ch chan<- time.Time) {
for {
t := time.Now()
ch <- t
dt := t.Truncate(interval).Add(interval).Sub(t)
if dt > 0 {
time.Sleep(dt)
}
}
}
func getArg(i *int) string {
if *i > len(os.Args)-2 {
fmt.Fprintln(os.Stderr, "missing value for the parameter", os.Args[*i])
usage(true)
}
*i++
return os.Args[*i]
}
func main() {
if len(os.Args) > 0 {
_, p := filepath.Split(os.Args[0])
if len(p) > 0 {
progName = p
}
}
interval := time.Minute
m := monitor{ch: make(chan string)}
var format string
var err error
for i := 1; i < len(os.Args); i++ {
switch os.Args[i] {
case "-h", "--help":
usage(false)
return
case "-t":
ti := getArg(&i)
switch strings.ToLower(ti) {
case "s", "second":
interval = time.Second
case "m", "minute":
interval = time.Minute
case "h", "hour":
interval = time.Hour
case "d", "day":
interval = 24 * time.Hour
default:
fmt.Fprintln(os.Stderr, "invalid interval:", ti)
usage(true)
}
case "-f":
format = getArg(&i)
case "-x":
err = m.loadTranslations(getArg(&i))
if err != nil {
fmt.Fprintln(os.Stderr, "failed to load translations:", err)
os.Exit(1)
}
default:
fmt.Fprintln(os.Stderr, "unknown parameter:", os.Args[i])
usage(true)
}
}
if len(format) == 0 {
switch interval {
case time.Second:
format = "2006-01-02 15:04:05"
case time.Minute:
format = "2006-01-02 15:04"
case time.Hour:
format = "2006-01-02 15h"
case 24 * time.Hour:
format = "2006-01-02"
}
}
if interval > time.Hour {
interval = time.Hour
}
m.s, err = Connect("")
if err != nil && err != ErrNoIPC {
fmt.Fprintln(os.Stderr, "failed to connect to Sway:", err)
os.Exit(1)
}
if m.s != nil {
go m.watchLayouts()
format = " " + format
}
format += "\n"
tch := make(chan time.Time, 1)
go timer(interval, tch)
var t time.Time
var layout, prevStatus string
for {
select {
case layout = <-m.ch:
t = time.Now()
case t = <-tch:
}
status := layout + t.Format(format)
if status != prevStatus {
n, err := io.WriteString(os.Stdout, status)
if err == nil && n < len(status) {
err = io.ErrShortWrite
}
if err != nil {
fmt.Fprintln(os.Stderr, "failed to output status line:", err)
os.Exit(1)
}
prevStatus = status
}
}
}