Split into category packages; module github.com/ZacharyZhang-NY/MujicaUI

datetime/relative_time.go

@@ -0,0 +1,77 @@
+package datetime
+
+import (
+	"fmt"
+	"time"
+
+	"github.com/egoist/mygo/ui"
+
+	"github.com/ZacharyZhang-NY/MujicaUI/core"
+)
+
+// RelativeTimeOptions configure a RelativeTime.
+type RelativeTimeOptions struct {
+	// Location is the tooltip's zone; required.
+	Location *time.Location
+	// Now fixes the clock and stops updates.
+	Now    time.Time
+	Hour12 bool
+}
+
+// RelativeTime shows t as "3 minutes ago", refreshing while shown.
+func RelativeTime(c *ui.Context, t time.Time, opts RelativeTimeOptions) *ui.Element {
+	loc := eventLocation("RelativeTime", opts.Location)
+	now := opts.Now
+	if now.IsZero() {
+		now = c.Now()
+		c.After(relativeTimeNext(now.Sub(t)))
+	}
+	text := RelativeTimeText(c, now.Sub(t))
+	w := t.In(loc)
+	exact := core.DateOf(w).String() + " " + timeText(c, TimeOfDay{w.Hour(), w.Minute(), 0}, timeConfig{hour12: opts.Hour12}) + " " + w.Format("MST")
+	return ui.Text(c, text).Label(text + ", " + exact).Tooltip(exact).FontFeatures("tnum")
+}
+
+// RelativeTimeText words d ago (positive) or ahead (negative).
+func RelativeTimeText(c *ui.Context, d time.Duration) string {
+	past := d >= 0
+	if !past {
+		d = -d
+	}
+	var key string
+	var n int
+	switch {
+	case d < 45*time.Second:
+		return core.Msg(c, "relative_time.now")
+	case d < 45*time.Minute:
+		key, n = "minutes", max(1, int(d/time.Minute))
+	case d < 22*time.Hour:
+		key, n = "hours", max(1, int(d/time.Hour))
+	case d < 26*24*time.Hour:
+		key, n = "days", max(1, int(d/(24*time.Hour)))
+	case d < 320*24*time.Hour:
+		key, n = "months", max(1, int(d/(30*24*time.Hour)))
+	default:
+		key, n = "years", max(1, int(d/(365*24*time.Hour)))
+	}
+	unit := core.CalendarCount(c, "relative_time."+key, n)
+	if past {
+		return fmt.Sprintf(core.Msg(c, "relative_time.ago"), unit)
+	}
+	return fmt.Sprintf(core.Msg(c, "relative_time.in"), unit)
+}
+
+// relativeTimeNext is how long until the wording may change.
+func relativeTimeNext(d time.Duration) time.Duration {
+	if d < 0 {
+		d = -d
+	}
+	step := time.Hour
+	switch {
+	case d < 2*time.Minute:
+		step = time.Second
+	case d < 2*time.Hour:
+		step = time.Minute
+	}
+	return step - d%step
+}