--until option

main.go

@@ -5,6 +5,8 @@ import (
 	"flag"
 	"fmt"
 	"local/logger"
+	"strconv"
+	"strings"
 	"time"
 
 	"github.com/eiannone/keyboard"
@@ -24,6 +26,7 @@ func main() {
 	var repeat bool
 	var invert bool
 	var eta bool
+	var until string
 
 	flag.BoolVar(&repeat, "repeat", true, "Whether to repeat the timer on complete")
 	flag.BoolVar(&invert, "stopwatch", false, "Use as a stopwatch")
@@ -32,8 +35,27 @@ func main() {
 	flag.StringVar(&alertMessage, "msg", "Timer up", "Message to display on timer expiration")
 	flag.StringVar(&interval, "interval", "500ms", "Interval duration")
 	flag.BoolVar(&eta, "eta", false, "Whether to display the ending time")
+	flag.StringVar(&until, "until", "", "Overload to make a non-repeating timer until given time as 23:59")
 	flag.Parse()
 
+	if until != "" {
+		repeat = false
+		offset = "0m"
+		now := time.Now()
+		targetHourStr := strings.Split(until, ":")[0]
+		targetMinStr := strings.Split(until, ":")[1]
+		hour, err := strconv.Atoi(targetHourStr)
+		if err != nil {
+			panic(err)
+		}
+		min, err := strconv.Atoi(targetMinStr)
+		if err != nil {
+			panic(err)
+		}
+		thenTime := time.Date(now.Year(), now.Month(), now.Day(), hour, min, 0, 0, now.Location())
+		duration = thenTime.Sub(now).String()
+	}
+
 	tickerInterval, err := time.ParseDuration(interval)
 	if err != nil {
 		panic(err)