92 lines
1.4 KiB
Go
92 lines
1.4 KiB
Go
/*
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©AngelaMos | 2026
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spinner.go
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Goroutine-backed terminal spinner with graceful stop
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Renders a braille-frame animation while scanners run. Hides the
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cursor on start, clears the line on stop, and uses a WaitGroup to
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block until the background goroutine exits cleanly.
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*/
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package ui
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import (
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"fmt"
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"strings"
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"sync"
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"time"
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)
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var frames = []string{
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"⠋", "⠙", "⠹", "⠸", "⠼", "⠴", "⠦", "⠧", "⠇", "⠏",
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}
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type Spinner struct {
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msg string
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done chan struct{}
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wg sync.WaitGroup
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mu sync.Mutex
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active bool
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}
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func NewSpinner(msg string) *Spinner {
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return &Spinner{msg: msg}
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}
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func (s *Spinner) Start() {
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s.mu.Lock()
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if s.active {
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s.mu.Unlock()
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return
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}
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s.active = true
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s.done = make(chan struct{})
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s.wg.Add(1)
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s.mu.Unlock()
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go s.run()
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}
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func (s *Spinner) Stop() {
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s.mu.Lock()
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if !s.active {
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s.mu.Unlock()
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return
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}
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s.active = false
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close(s.done)
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s.mu.Unlock()
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s.wg.Wait()
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}
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func (s *Spinner) run() {
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defer s.wg.Done()
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fmt.Print("\033[?25l")
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ticker := time.NewTicker(80 * time.Millisecond)
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defer ticker.Stop()
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idx := 0
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for {
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select {
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case <-s.done:
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clearLine()
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fmt.Print("\033[?25h")
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return
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case <-ticker.C:
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frame := frames[idx%len(frames)]
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fmt.Printf(
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"\r %s %s",
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CyanBold(frame),
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Magenta(s.msg),
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)
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idx++
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}
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}
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}
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func clearLine() {
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fmt.Print("\r" + strings.Repeat(" ", 80) + "\r")
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}
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