49 lines
913 B
Go
49 lines
913 B
Go
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package main
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import (
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"fmt"
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"os"
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"time"
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"sync"
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)
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const filename string = "countdown.txt"
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var until time.Time = time.Now().Add(time.Minute)
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func main() {
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d, err := time.ParseDuration("1s")
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if err != nil {
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fmt.Println(err)
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os.Exit(1)
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}
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fmt.Printf("until: %s\n", until)
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wg := sync.WaitGroup{}
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wg.Add(1)
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ticker := time.NewTicker(d)
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go func(c <-chan time.Time) {
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fmt.Println("XX")
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_ = <-c
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count := time.Until(until)
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for ; count >= 0; count = time.Until(until) {
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_ = <-c
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str := fmt.Sprintf("%02.0f:%02.0f:%02.0f\n", count.Hours(), count.Minutes(), count.Seconds())
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err = os.WriteFile(filename, []byte(str), 0777)
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if err != nil {
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fmt.Println("unable to write file: %v\n", err)
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}
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}
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wg.Done()
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}(ticker.C)
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wg.Wait()
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err = os.WriteFile(filename, []byte("00:00:00"), 0777)
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if err != nil {
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fmt.Println("unable to write file: %v\n", err)
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}
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fmt.Println("\nDONE")
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}
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