mirror of https://github.com/Llewellynvdm/fzf.git
97 lines
1.9 KiB
Go
97 lines
1.9 KiB
Go
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
|
|
}
|
|
}
|
|
})
|
|
}
|
|
}
|