forked from antonmedv/countdown
/
main.go
143 lines (118 loc) · 2.07 KB
/
main.go
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package main
import (
"fmt"
"os"
"time"
"github.com/nsf/termbox-go"
)
const (
usage = `usage:
countdown 25s [message]
countdown 1m50s [message]
countdown 2h45m50s [message]
`
tick = time.Second
)
var (
timer *time.Timer
ticker *time.Ticker
queues chan termbox.Event
startDone bool
startX, startY int
)
func draw(d time.Duration) {
w, h := termbox.Size()
clear()
str := format(d)
text := toText(str)
if !startDone {
startDone = true
startX, startY = w/2-text.width()/2, h/2-text.height()/2
}
x, y := startX, startY
for _, s := range text {
echo(s, x, y)
x += s.width()
}
flush()
}
func format(d time.Duration) string {
d = d.Round(time.Second)
h := d / time.Hour
d -= h * time.Hour
m := d / time.Minute
d -= m * time.Minute
s := d / time.Second
if h < 1 {
return fmt.Sprintf("%02d:%02d", m, s)
}
return fmt.Sprintf("%02d:%02d:%02d", h, m, s)
}
func start(d time.Duration) {
timer = time.NewTimer(d)
ticker = time.NewTicker(tick)
}
func stop() {
timer.Stop()
ticker.Stop()
}
func countdown(left time.Duration) {
var exitCode int
start(left)
loop:
for {
select {
case ev := <-queues:
if ev.Type == termbox.EventKey && (ev.Key == termbox.KeyEsc || ev.Key == termbox.KeyCtrlC) {
exitCode = 1
break loop
}
if ev.Ch == 'p' || ev.Ch == 'P' {
stop()
}
if ev.Ch == 'c' || ev.Ch == 'C' {
start(left)
}
case <-ticker.C:
left -= tick
draw(left)
case <-timer.C:
break loop
}
}
termbox.Close()
if exitCode != 0 {
os.Exit(exitCode)
}
}
func main() {
checkTerminalNotifier()
argc := len(os.Args)
if argc < 2 || argc > 3 {
stderr(usage)
os.Exit(2)
}
var msg string
if argc == 3 {
msg = os.Args[2]
}
defer notice(msg)
duration, err := time.ParseDuration(os.Args[1])
if err != nil {
stderr("error: invalid duration: %v\n", os.Args[1])
os.Exit(2)
}
left := duration
err = termbox.Init()
if err != nil {
panic(err)
}
queues = make(chan termbox.Event)
go func() {
for {
queues <- termbox.PollEvent()
}
}()
draw(left)
countdown(left)
}