mirror of https://github.com/Llewellynvdm/fzf.git
81 lines
1.7 KiB
Go
81 lines
1.7 KiB
Go
package util
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import "sync"
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// EventType is the type for fzf events
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type EventType int
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// Events is a type that associates EventType to any data
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type Events map[EventType]interface{}
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// EventBox is used for coordinating events
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type EventBox struct {
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events Events
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cond *sync.Cond
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ignore map[EventType]bool
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}
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// NewEventBox returns a new EventBox
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func NewEventBox() *EventBox {
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return &EventBox{
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events: make(Events),
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cond: sync.NewCond(&sync.Mutex{}),
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ignore: make(map[EventType]bool)}
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}
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// Wait blocks the goroutine until signaled
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func (b *EventBox) Wait(callback func(*Events)) {
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b.cond.L.Lock()
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defer b.cond.L.Unlock()
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if len(b.events) == 0 {
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b.cond.Wait()
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}
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callback(&b.events)
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}
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// Set turns on the event type on the box
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func (b *EventBox) Set(event EventType, value interface{}) {
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b.cond.L.Lock()
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defer b.cond.L.Unlock()
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b.events[event] = value
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if _, found := b.ignore[event]; !found {
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b.cond.Broadcast()
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}
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}
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// Clear clears the events
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// Unsynchronized; should be called within Wait routine
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func (events *Events) Clear() {
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for event := range *events {
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delete(*events, event)
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}
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}
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// Peak peaks at the event box if the given event is set
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func (b *EventBox) Peak(event EventType) bool {
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b.cond.L.Lock()
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defer b.cond.L.Unlock()
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_, ok := b.events[event]
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return ok
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}
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// Watch deletes the events from the ignore list
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func (b *EventBox) Watch(events ...EventType) {
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b.cond.L.Lock()
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defer b.cond.L.Unlock()
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for _, event := range events {
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delete(b.ignore, event)
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}
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}
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// Unwatch adds the events to the ignore list
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func (b *EventBox) Unwatch(events ...EventType) {
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b.cond.L.Lock()
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defer b.cond.L.Unlock()
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for _, event := range events {
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b.ignore[event] = true
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}
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}
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