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package mpb
import (
"io"
"unicode/utf8"
"github.com/vbauerster/mpb/v5/decor"
"github.com/vbauerster/mpb/v5/internal"
)
const (
rLeft = iota
rFill
rTip
rEmpty
rRight
rRevTip
rRefill
)
// DefaultBarStyle is a string containing 7 runes.
// Each rune is a building block of a progress bar.
//
// '1st rune' stands for left boundary rune
//
// '2nd rune' stands for fill rune
//
// '3rd rune' stands for tip rune
//
// '4th rune' stands for empty rune
//
// '5th rune' stands for right boundary rune
//
// '6th rune' stands for reverse tip rune
//
// '7th rune' stands for refill rune
//
const DefaultBarStyle string = "[=>-]<+"
type barFiller struct {
format [][]byte
tip []byte
refill int64
reverse bool
flush func(w io.Writer, bb [][]byte)
}
// NewBarFiller constucts mpb.BarFiller, to be used with *Progress.Add(...) *Bar method.
func NewBarFiller(style string, reverse bool) BarFiller {
if style == "" {
style = DefaultBarStyle
}
bf := &barFiller{
format: make([][]byte, utf8.RuneCountInString(style)),
reverse: reverse,
}
bf.SetStyle(style)
return bf
}
func (s *barFiller) SetStyle(style string) {
if !utf8.ValidString(style) {
return
}
src := make([][]byte, 0, utf8.RuneCountInString(style))
for _, r := range style {
src = append(src, []byte(string(r)))
}
copy(s.format, src)
s.SetReverse(s.reverse)
}
func (s *barFiller) SetReverse(reverse bool) {
if reverse {
s.tip = s.format[rRevTip]
s.flush = reverseFlush
} else {
s.tip = s.format[rTip]
s.flush = regularFlush
}
s.reverse = reverse
}
func (s *barFiller) SetRefill(amount int64) {
s.refill = amount
}
func (s *barFiller) Fill(w io.Writer, width int, stat *decor.Statistics) {
// don't count rLeft and rRight as progress
width -= 2
if width < 2 {
return
}
w.Write(s.format[rLeft])
defer w.Write(s.format[rRight])
bb := make([][]byte, width)
cwidth := int(internal.PercentageRound(stat.Total, stat.Current, width))
for i := 0; i < cwidth; i++ {
bb[i] = s.format[rFill]
}
if s.refill > 0 {
var rwidth int
if s.refill > stat.Current {
rwidth = cwidth
} else {
rwidth = int(internal.PercentageRound(stat.Total, int64(s.refill), width))
}
for i := 0; i < rwidth; i++ {
bb[i] = s.format[rRefill]
}
}
if cwidth > 0 && cwidth < width {
bb[cwidth-1] = s.tip
}
for i := cwidth; i < width; i++ {
bb[i] = s.format[rEmpty]
}
s.flush(w, bb)
}
func regularFlush(w io.Writer, bb [][]byte) {
for i := 0; i < len(bb); i++ {
w.Write(bb[i])
}
}
func reverseFlush(w io.Writer, bb [][]byte) {
for i := len(bb) - 1; i >= 0; i-- {
w.Write(bb[i])
}
}
|
