Initial commit

"Works", but needs LOTS of polish.  And some over engineering.

.gitignore

@@ -0,0 +1 @@
+countdown.txt

main.go

@@ -0,0 +1,48 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"time"
+	"sync"
+)
+
+const filename string = "countdown.txt"
+var until time.Time = time.Now().Add(time.Minute)
+
+func main() {
+	d, err := time.ParseDuration("1s")
+	if err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+	}
+
+	fmt.Printf("until: %s\n", until)
+
+	wg := sync.WaitGroup{}
+	wg.Add(1)
+	ticker := time.NewTicker(d)
+	go func(c <-chan time.Time) {
+		fmt.Println("XX")
+		_ = <-c
+		count := time.Until(until)
+		for ; count >= 0; count = time.Until(until) {
+			_ = <-c
+			str := fmt.Sprintf("%02.0f:%02.0f:%02.0f\n", count.Hours(), count.Minutes(), count.Seconds())
+			err = os.WriteFile(filename, []byte(str), 0777)
+			if err != nil {
+				fmt.Println("unable to write file: %v\n", err)
+			}
+		}
+		wg.Done()
+	}(ticker.C)
+
+	wg.Wait()
+
+	err = os.WriteFile(filename, []byte("00:00:00"), 0777)
+	if err != nil {
+		fmt.Println("unable to write file: %v\n", err)
+	}
+
+	fmt.Println("\nDONE")
+}