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#!/usr/bin/env yaegi
package main
import (
"encoding/json"
"log"
"os"
"os/exec"
"os/signal"
"runtime"
"strings"
. "syscall"
)
func main() {
runtime.GOMAXPROCS(1)
var (
update = make(chan os.Signal, 1)
cancel = make(chan os.Signal, 1)
)
signal.Notify(update, SIGUSR1, SIGUSR2, SIGHUP)
signal.Notify(cancel, SIGTERM, SIGINT)
// could use golang.org/x/sys/unix.Prctl here
// but I want to avoid the dependency
if _, _, e := Syscall6(uintptr(SYS_PRCTL),
uintptr(PR_SET_PDEATHSIG),
uintptr(SIGTERM),
0, 0, 0, 0); e != 0 {
log.Fatalf("error: %v", e)
}
lookup()
for {
select {
case sig := <-update:
switch sig {
case SIGUSR1:
printJson("day")
// TODO(robert): toggle wlsunset off?
case SIGUSR2:
printJson("night")
// TODO(robert): toggle wlsunset on?
case SIGHUP:
lookup()
}
case <-cancel:
log.Printf("%v exiting\n", os.Args[0])
os.Exit(0)
}
}
}
func printJson(phase string) {
_ = json.NewEncoder(os.Stdout).Encode(map[string]interface{}{
"class": phase,
"alt": phase,
"tooltip": "gamma: " + phase,
"text": phase,
})
}
func lookup() {
cmdEnv, ok := os.LookupEnv("GAMMA_COMMAND")
if !ok {
printJson("unknown")
return
}
b, err := exec.Command("bash", "-c", cmdEnv).Output()
if err != nil {
log.Fatalf("error: %v", err)
return
}
phase := strings.TrimSpace(string(b))
printJson(phase)
}
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