happy me

.gitignore

@@ -0,0 +1 @@
+*.swp

main.go

@@ -0,0 +1,126 @@
+// Package main has a comment
+package main
+
+import (
+	"flag"
+	"fmt"
+	"time"
+
+	"github.com/eiannone/keyboard"
+)
+
+func main() {
+	var duration string
+	var offset string
+	var interval string
+	var repeat bool
+	var invert bool
+
+	flag.BoolVar(&repeat, "repeat", true, "Whether to repeat the timer on complete")
+	flag.BoolVar(&invert, "stopwatch", false, "Use as a stopwatch")
+	flag.StringVar(&duration, "duration", "30m", "How long the timer should be")
+	flag.StringVar(&offset, "offset", "0m", "How much time the initial time should skip")
+	flag.StringVar(&interval, "interval", "500ms", "Interval duration")
+	flag.Parse()
+
+	tickerInterval, err := time.ParseDuration(interval)
+	if err != nil {
+		panic(err)
+	}
+
+	monitor := time.NewTicker(tickerInterval)
+	defer monitor.Stop()
+	base, err := time.ParseDuration(duration)
+	if err != nil {
+		panic(err)
+	}
+	var cur time.Duration
+	if invert {
+		cur = time.Duration(0)
+	} else {
+		cur = base
+	}
+	skip, err := time.ParseDuration(offset)
+	if err != nil {
+		panic(err)
+	}
+	if invert {
+		cur += skip
+	} else {
+		cur -= skip
+	}
+
+	stop := make(chan bool)
+	pause := make(chan bool)
+	confirm := make(chan bool)
+	paused := false
+	delim := ':'
+
+	fmt.Println("Quit with 'q', Pause with 'p'")
+
+	go func() {
+		last := time.Now()
+		printTime(cur, base, &delim, invert)
+		for {
+			select {
+			case <-monitor.C:
+				if invert {
+					cur += time.Now().Sub(last)
+				} else {
+					cur -= time.Now().Sub(last)
+				}
+			case state := <-pause:
+				if !state {
+					monitor = time.NewTicker(tickerInterval)
+				} else {
+					monitor.Stop()
+				}
+			case <-stop:
+				fmt.Println("")
+				confirm <- true
+				return
+			}
+			last = time.Now()
+			printTime(cur, base, &delim, invert)
+		}
+	}()
+
+	if err := keyboard.Open(); err != nil {
+		panic(err)
+	}
+	defer keyboard.Close()
+	for {
+		b, _, err := keyboard.GetKey()
+		if err != nil {
+			panic(err)
+		}
+		switch b {
+		case 'q':
+			stop <- true
+			<-confirm
+			return
+		case 'p':
+			paused = !paused
+			pause <- paused
+		}
+	}
+}
+
+func printTime(remains time.Duration, target time.Duration, delim *rune, reverse bool) {
+	sec := remains.Seconds()
+	hrs := int(sec / 60.0)
+	seconds := int(sec) % 60
+	if *delim == ':' {
+		*delim = ' '
+	} else {
+		*delim = ':'
+	}
+	if reverse {
+		remains := target - remains
+		rHrs := int(remains.Seconds() / 60.0)
+		rSec := int(remains.Seconds()) % 60
+		fmt.Printf("\rAt: %d%c%02d\tRemaining: %d%c%02d", hrs, byte(*delim), seconds, rHrs, byte(*delim), rSec)
+	} else {
+		fmt.Printf("\rRemaining: %d%c%02d", hrs, byte(*delim), seconds)
+	}
+}