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package mpb
import (
"io"
"strings"
"github.com/mattn/go-runewidth"
"github.com/vbauerster/mpb/v6/decor"
"github.com/vbauerster/mpb/v6/internal"
)
// SpinnerAlignment enum.
type SpinnerAlignment int
// SpinnerAlignment kinds.
const (
SpinnerOnLeft SpinnerAlignment = iota
SpinnerOnMiddle
SpinnerOnRight
)
// SpinnerDefaultStyle is a style for rendering a spinner.
var SpinnerDefaultStyle = []string{"⠋", "⠙", "⠹", "⠸", "⠼", "⠴", "⠦", "⠧", "⠇", "⠏"}
type spinnerFiller struct {
frames []string
count uint
alignment SpinnerAlignment
}
// NewSpinnerFiller returns a BarFiller implementation which renders
// a spinner. If style is nil or zero length, SpinnerDefaultStyle is
// applied. To be used with `*Progress.Add(...) *Bar` method.
func NewSpinnerFiller(style []string, alignment SpinnerAlignment) BarFiller {
if len(style) == 0 {
style = SpinnerDefaultStyle
}
filler := &spinnerFiller{
frames: style,
alignment: alignment,
}
return filler
}
func (s *spinnerFiller) Fill(w io.Writer, reqWidth int, stat decor.Statistics) {
width := internal.CheckRequestedWidth(reqWidth, stat.AvailableWidth)
frame := s.frames[s.count%uint(len(s.frames))]
frameWidth := runewidth.StringWidth(frame)
if width < frameWidth {
return
}
switch rest := width - frameWidth; s.alignment {
case SpinnerOnLeft:
io.WriteString(w, frame+strings.Repeat(" ", rest))
case SpinnerOnMiddle:
str := strings.Repeat(" ", rest/2) + frame + strings.Repeat(" ", rest/2+rest%2)
io.WriteString(w, str)
case SpinnerOnRight:
io.WriteString(w, strings.Repeat(" ", rest)+frame)
}
s.count++
}
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