87 lines
1.5 KiB
Go
87 lines
1.5 KiB
Go
package main
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import (
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"flag"
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"fmt"
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"os"
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"os/signal"
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"syscall"
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"time"
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"github.com/mattn/go-isatty"
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)
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var (
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Version = "0.0.0"
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Build = "alpha"
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local string
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flagTick string
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flagVer bool
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)
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func main() {
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flag.StringVar(&local, "local", fmt.Sprint(time.Local), "set local manually")
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flag.StringVar(&flagTick, "tick", "1s", "ticking interval")
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flag.BoolVar(&flagVer, "v", false, "show version")
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flag.Usage = func() {
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fmt.Fprintf(os.Stderr, "Usage: kclock [options]\n")
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flag.PrintDefaults()
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}
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flag.Parse()
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if flagVer {
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fmt.Printf("%v - %v\n", Version, Build)
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return
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}
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l, err := time.LoadLocation(local)
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if err != nil {
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panic(err)
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}
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time.Local = l
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watch()
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}
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func watch() {
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interval, err := time.ParseDuration(flagTick)
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if err != nil {
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panic(err)
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}
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color := isatty.IsTerminal(os.Stdout.Fd())
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if !color {
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color = isatty.IsCygwinTerminal(os.Stdout.Fd())
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}
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quit := make(chan os.Signal, 1)
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signal.Notify(quit, os.Interrupt, syscall.SIGINT, syscall.SIGTERM)
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start := time.Now()
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<-time.After(time.Until(time.Now().Truncate(time.Second).Add(time.Second)))
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tick := time.Tick(interval)
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if color {
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fmt.Printf("\n")
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}
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for {
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if color {
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fmt.Printf("\r\033[1A\033[0K\033[32m%v\033[0m\n", time.Now().Truncate(time.Second))
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} else {
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fmt.Printf("%v\n", time.Now().Truncate(time.Second))
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}
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select {
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case <-tick:
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case <-quit:
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if color {
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fmt.Printf("\r\033[0Ktime elapsed: \033[34m%v\033[0m\n", time.Since(start))
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} else {
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fmt.Printf("time elapsed: %v\n", time.Since(start))
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}
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return
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}
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}
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}
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