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package util
import "sync"
// EventType is the type for fzf events
type EventType int
// Events is a type that associates EventType to any data
type Events map[EventType]interface{}
// EventBox is used for coordinating events
type EventBox struct {
events Events
cond *sync.Cond
ignore map[EventType]bool
}
// NewEventBox returns a new EventBox
func NewEventBox() *EventBox {
return &EventBox{
events: make(Events),
cond: sync.NewCond(&sync.Mutex{}),
ignore: make(map[EventType]bool)}
}
// Wait blocks the goroutine until signaled
func (b *EventBox) Wait(callback func(*Events)) {
b.cond.L.Lock()
if len(b.events) == 0 {
b.cond.Wait()
}
callback(&b.events)
b.cond.L.Unlock()
}
// Set turns on the event type on the box
func (b *EventBox) Set(event EventType, value interface{}) {
b.cond.L.Lock()
b.events[event] = value
if _, found := b.ignore[event]; !found {
b.cond.Broadcast()
}
b.cond.L.Unlock()
}
// Clear clears the events
// Unsynchronized; should be called within Wait routine
func (events *Events) Clear() {
for event := range *events {
delete(*events, event)
}
}
// Peek peeks at the event box if the given event is set
func (b *EventBox) Peek(event EventType) bool {
b.cond.L.Lock()
_, ok := b.events[event]
b.cond.L.Unlock()
return ok
}
// Watch deletes the events from the ignore list
func (b *EventBox) Watch(events ...EventType) {
b.cond.L.Lock()
for _, event := range events {
delete(b.ignore, event)
}
b.cond.L.Unlock()
}
// Unwatch adds the events to the ignore list
func (b *EventBox) Unwatch(events ...EventType) {
b.cond.L.Lock()
for _, event := range events {
b.ignore[event] = true
}
b.cond.L.Unlock()
}
// WaitFor blocks the execution until the event is received
func (b *EventBox) WaitFor(event EventType) {
looping := true
for looping {
b.Wait(func(events *Events) {
for evt := range *events {
switch evt {
case event:
looping = false
return
}
}
})
}
}
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