52 lines
1.1 KiB
Go
52 lines
1.1 KiB
Go
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package cli
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import (
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"fmt"
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"time"
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)
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// ShowWaitAnimation "draws" an animated ellipses to stdout until something is
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// received on the signal channel. An empty string sent to the channel to
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// noftify the caller that the animation has completed (carriage returned).
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func ShowWaitAnimation(signal chan any) {
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animationStep := 0
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for {
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select {
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case _ = <-signal:
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fmt.Print("\r")
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signal <- ""
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return
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default:
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modSix := animationStep % 6
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if modSix == 3 || modSix == 0 {
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fmt.Print("\r")
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}
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if modSix < 3 {
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fmt.Print(".")
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} else {
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fmt.Print(" ")
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}
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animationStep++
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time.Sleep(250 * time.Millisecond)
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}
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}
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}
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// HandledDelayedResponse writes a waiting animation (abusing \r) and the
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// content received on the response channel to stdout. Blocks until the channel
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// is closed.
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func HandleDelayedResponse(response chan string) {
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waitSignal := make(chan any)
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go ShowWaitAnimation(waitSignal)
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firstChunk := true
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for chunk := range response {
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if firstChunk {
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waitSignal <- ""
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<-waitSignal
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firstChunk = false
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}
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fmt.Print(chunk)
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}
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}
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