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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,156 @@ | ||
| package prompt | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "io" | ||
| "os" | ||
| "time" | ||
| ) | ||
|
|
||
| type ProgressBar struct { | ||
| w io.Writer | ||
| description string | ||
| cur uint64 | ||
| max uint64 | ||
| barSegments int | ||
| tickInterval time.Duration | ||
| close chan struct{} | ||
| update chan struct{} | ||
| running chan struct{} | ||
| additionalInfo []func() string | ||
| } | ||
|
|
||
| type ProgressOption func(*ProgressBar) | ||
|
|
||
| func ProgressOptionDescription(description string) ProgressOption { | ||
| return func(bar *ProgressBar) { | ||
| bar.description = description | ||
| } | ||
| } | ||
|
|
||
| func ProgressOptionBarSegments(segments int) ProgressOption { | ||
| return func(bar *ProgressBar) { | ||
| bar.barSegments = segments | ||
| } | ||
| } | ||
|
|
||
| func ProgressOptionTickInterval(interval time.Duration) ProgressOption { | ||
| return func(bar *ProgressBar) { | ||
| bar.tickInterval = interval | ||
| } | ||
| } | ||
|
|
||
| func ProgressOptionAppendAdditionalInfo(f func() string) ProgressOption { | ||
| return func(bar *ProgressBar) { | ||
| bar.additionalInfo = append(bar.additionalInfo, f) | ||
| } | ||
| } | ||
|
|
||
| func NewProgressBar(opts ...ProgressOption) *ProgressBar { | ||
| bar := &ProgressBar{ | ||
| max: 100, | ||
| barSegments: 30, | ||
| close: make(chan struct{}), | ||
| update: make(chan struct{}), | ||
| running: make(chan struct{}), | ||
| } | ||
|
|
||
| for _, o := range opts { | ||
| o(bar) | ||
| } | ||
|
|
||
| return bar | ||
| } | ||
|
|
||
| func (p *ProgressBar) percentage() float64 { | ||
| if p.max == 0 { | ||
| return 0 | ||
| } | ||
|
|
||
| return float64(p.cur) / float64(p.max) | ||
| } | ||
|
|
||
| func (p *ProgressBar) bar() string { | ||
| segments := int(float64(p.barSegments) * p.percentage()) | ||
|
|
||
| if p.percentage() > 0 && segments == 0 { | ||
| segments = 1 | ||
| } | ||
|
|
||
| bar := make([]byte, p.barSegments+2) | ||
| bar[0] = '[' | ||
| bar[p.barSegments+1] = ']' | ||
| b := bar[1 : len(bar)-1] | ||
| for i := range b { | ||
| switch { | ||
| case i == segments-1: | ||
| b[i] = '>' | ||
| case i < segments: | ||
| b[i] = '=' | ||
| default: | ||
| b[i] = ' ' | ||
| } | ||
| } | ||
|
|
||
| return string(bar) | ||
| } | ||
|
|
||
| func (ProgressBar) clearLine() { | ||
| fmt.Fprint(os.Stderr, "\r") | ||
| } | ||
|
|
||
| func (p *ProgressBar) print() { | ||
| d := p.description | ||
| if len(d) > 0 { | ||
| d = " " + d | ||
| } | ||
| fmt.Fprintf(os.Stderr, "%s %.1f %% %s", d, p.percentage()*100, p.bar()) | ||
| for _, f := range p.additionalInfo { | ||
| fmt.Fprintf(os.Stderr, " %s", f()) | ||
| } | ||
| } | ||
|
|
||
| func (p *ProgressBar) run() { | ||
| defer close(p.running) | ||
| for { | ||
| p.clearLine() | ||
| p.print() | ||
| var tick <-chan time.Time | ||
| if p.tickInterval > 0 { | ||
| tick = time.After(p.tickInterval) | ||
| } | ||
| select { | ||
| case <-p.close: | ||
| return | ||
| case <-tick: | ||
| case <-p.update: | ||
| } | ||
| } | ||
| } | ||
|
|
||
| func (p *ProgressBar) Update(cur uint64) { | ||
| p.Set(cur, p.max) | ||
| } | ||
|
|
||
| func (p *ProgressBar) Set(cur, max uint64) { | ||
| p.cur, p.max = cur, max | ||
| select { | ||
| case p.update <- struct{}{}: | ||
| default: | ||
| } | ||
| } | ||
|
|
||
| func (p *ProgressBar) Finish() { | ||
| p.Set(p.max, p.max) | ||
| p.Stop() | ||
| <-p.running | ||
| fmt.Fprintln(os.Stderr) | ||
| } | ||
|
|
||
| func (p *ProgressBar) Start() { | ||
| go p.run() | ||
| } | ||
|
|
||
| func (p *ProgressBar) Stop() { | ||
| close(p.close) | ||
| } |
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