Refactor loop code into its own package

tools/tui/loop/timers.go

@@ -0,0 +1,44 @@
+// License: GPLv3 Copyright: 2022, Kovid Goyal, <kovid at kovidgoyal.net>
+
+package loop
+
+import (
+	"sort"
+	"time"
+)
+
+func (self *Loop) dispatch_timers(now time.Time) error {
+	updated := false
+	remove := make(map[IdType]bool, 0)
+	for _, t := range self.timers {
+		if now.After(t.deadline) {
+			err := t.callback(t.id)
+			if err != nil {
+				return err
+			}
+			if t.repeats {
+				t.update_deadline(now)
+				updated = true
+			} else {
+				remove[t.id] = true
+			}
+		}
+	}
+	if len(remove) > 0 {
+		timers := make([]*timer, len(self.timers)-len(remove))
+		for _, t := range self.timers {
+			if !remove[t.id] {
+				timers = append(timers, t)
+			}
+		}
+		self.timers = timers
+	}
+	if updated {
+		self.sort_timers()
+	}
+	return nil
+}
+
+func (self *Loop) sort_timers() {
+	sort.SliceStable(self.timers, func(a, b int) bool { return self.timers[a].deadline.Before(self.timers[b].deadline) })
+}