mirror of
https://github.com/kubernetes-sigs/kind.git
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120 lines
2.4 KiB
Go
120 lines
2.4 KiB
Go
/*
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Copyright 2018 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package cli
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import (
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"fmt"
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"io"
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"sync"
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"time"
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)
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// custom CLI loading spinner for kind
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var spinnerFrames = []string{
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"⠈⠁",
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"⠈⠑",
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"⠈⠱",
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"⠈⡱",
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"⢀⡱",
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"⢄⡱",
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"⢄⡱",
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"⢆⡱",
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"⢎⡱",
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"⢎⡰",
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"⢎⡠",
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"⢎⡀",
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"⢎⠁",
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"⠎⠁",
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"⠊⠁",
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}
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// Spinner is a simple and efficient CLI loading spinner used by kind
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// It is simplistic and assumes that the line length will not change.
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type Spinner struct {
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stop chan struct{}
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ticker *time.Ticker
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writer io.Writer
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mu *sync.Mutex
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// protected by mu
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prefix string
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suffix string
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}
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// spinner implements writer
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var _ io.Writer = &Spinner{}
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// NewSpinner initializes and returns a new Spinner that will write to w
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func NewSpinner(w io.Writer) *Spinner {
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return &Spinner{
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stop: make(chan struct{}, 1),
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ticker: time.NewTicker(time.Millisecond * 100),
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mu: &sync.Mutex{},
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writer: w,
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}
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}
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// SetPrefix sets the prefix to print before the spinner
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func (s *Spinner) SetPrefix(prefix string) {
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s.mu.Lock()
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s.prefix = prefix
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s.mu.Unlock()
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}
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// SetSuffix sets the suffix to print after the spinner
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func (s *Spinner) SetSuffix(suffix string) {
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s.mu.Lock()
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s.suffix = suffix
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s.mu.Unlock()
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}
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// Start starts the spinner running
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func (s *Spinner) Start() {
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go func() {
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for {
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for _, frame := range spinnerFrames {
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select {
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case <-s.stop:
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return
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case <-s.ticker.C:
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func() {
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s.mu.Lock()
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defer s.mu.Unlock()
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fmt.Fprintf(s.writer, "\r%s%s%s", s.prefix, frame, s.suffix)
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}()
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}
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}
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}
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}()
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}
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// Stop signals the spinner to stop
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func (s *Spinner) Stop() {
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s.stop <- struct{}{}
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}
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// Write implements io.Writer, interrupting the spinner and writing to
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// the inner writer
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func (s *Spinner) Write(p []byte) (n int, err error) {
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s.Stop()
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if _, err := s.writer.Write([]byte("\r")); err != nil {
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return 0, err
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}
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n, err = s.writer.Write(p)
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s.Start()
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return n, err
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}
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