mirror of
https://github.com/edgelesssys/constellation.git
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abe40de3e5
* first version of spinner - implemented class with basic method - covered with dummy test - integrated with init command * Style and license remarks * fixed review remarks * fixed typo + integration of spinner with terminate command * integration of spinner with create command
74 lines
1.3 KiB
Go
74 lines
1.3 KiB
Go
/*
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Copyright (c) Edgeless Systems GmbH
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SPDX-License-Identifier: AGPL-3.0-only
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*/
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package cmd
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import (
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"fmt"
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"sync"
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"sync/atomic"
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"time"
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"github.com/spf13/cobra"
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)
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var (
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spinnerStates = []string{"⣾", "⣽", "⣻", "⢿", "⡿", "⣟", "⣯", "⣷"}
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dotsStates = []string{".", "..", "..."}
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)
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type spinner struct {
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out *cobra.Command
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text string
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showDots bool
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delay time.Duration
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wg *sync.WaitGroup
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stop int32
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}
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func newSpinner(c *cobra.Command, text string, showDots bool) *spinner {
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return &spinner{
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out: c,
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text: text,
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showDots: showDots,
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wg: &sync.WaitGroup{},
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delay: 100 * time.Millisecond,
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stop: 0,
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}
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}
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func (s *spinner) Start() {
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s.wg.Add(1)
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go func() {
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defer s.wg.Done()
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for i := 0; ; i = (i + 1) % len(spinnerStates) {
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if atomic.LoadInt32(&s.stop) != 0 {
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break
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}
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dotsState := ""
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if s.showDots {
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dotsState = dotsStates[i%len(dotsStates)]
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}
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state := fmt.Sprintf("\r%s %s%s", spinnerStates[i], s.text, dotsState)
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s.out.Print(state)
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time.Sleep(s.delay)
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}
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dotsState := ""
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if s.showDots {
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dotsState = dotsStates[len(dotsStates)-1]
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}
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finalState := fmt.Sprintf("\r%s%s ", s.text, dotsState)
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s.out.Println(finalState)
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}()
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}
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func (s *spinner) Stop() {
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atomic.StoreInt32(&s.stop, 1)
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s.wg.Wait()
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}
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