Add timer provider

Signed-off-by: AKP <tom@tdpain.net>

cmd/bar/main.go

@@ -45,6 +45,7 @@ func run() error {
 
 	b.RegisterBlockGenerator(
 		providers.NewDateTime(),
+		providers.NewTimer(true),
 		providers.NewPulseaudioVolume(),
 		providers.NewMemory(7, 5),
 		providers.NewCPU(20, 50),

internal/providers/timer.go

@@ -0,0 +1,89 @@
+package providers
+
+import (
+	"fmt"
+	"time"
+
+	"github.com/codemicro/bar/internal/i3bar"
+)
+
+const (
+	timerSymbolPause = "⏸"
+	timerSymbolPlay  = "▶"
+	timerSymbolClock = "⏰"
+)
+
+type Timer struct {
+	UseShortLabel bool
+	
+	times []time.Time
+
+	name string
+}
+
+func NewTimer(useShortLabel bool) i3bar.BlockGenerator {
+	return &Timer{
+		UseShortLabel: useShortLabel,
+		name: "timer",
+	}
+}
+
+func (g *Timer) OnClick(event *i3bar.ClickEvent) bool {
+	resetButtonPressed := event.Button == 3
+
+	numStoredTimes := len(g.times)
+
+	if numStoredTimes == 0 {
+		// start
+		g.times = []time.Time{time.Now()}
+	} else if resetButtonPressed {
+		g.times = nil
+	} else {
+		// play/pause
+		g.times = append(g.times, time.Now())
+	}
+
+	return true
+}
+
+func (g *Timer) calculateDuration() time.Duration {
+	var sigma time.Duration
+	for i := 0; i < len(g.times); i += 2 {
+		next := time.Now()
+		if i+1 < len(g.times) {
+			next = g.times[i+1]
+		}
+		sigma += next.Sub(g.times[i])
+	}
+	return sigma.Round(time.Second)
+}
+
+func (g *Timer) Block(*i3bar.ColorSet) (*i3bar.Block, error) {
+	block := &i3bar.Block{
+		Name: g.name,
+	}
+
+	numStoredTimes := len(g.times)
+
+	if numStoredTimes == 0 {
+		if g.UseShortLabel {
+			block.FullText = timerSymbolClock
+			block.ShortText = timerSymbolClock
+		} else {
+			block.FullText = fmt.Sprintf("%s Click to start", timerSymbolClock)
+			block.ShortText = fmt.Sprintf("%s Click", timerSymbolClock)
+		}
+	} else {
+		symbol := timerSymbolPlay
+		if numStoredTimes%2 == 0 {
+			symbol = timerSymbolPause
+		}
+		block.FullText = fmt.Sprintf("%s %s %s", timerSymbolClock, symbol, g.calculateDuration())
+	}
+
+	return block, nil
+}
+
+func (g *Timer) GetNameAndInstance() (string, string) {
+	return g.name, ""
+}