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|
package mpb
import (
"bytes"
"io"
"unicode/utf8"
"github.com/mattn/go-runewidth"
"github.com/vbauerster/mpb/v5/decor"
"github.com/vbauerster/mpb/v5/internal"
)
const (
rLeft = iota
rFill
rTip
rSpace
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 space 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
rwidth []int
tip []byte
refill int64
reverse bool
flush func(io.Writer, *space, [][]byte)
}
type space struct {
space []byte
rwidth int
count int
}
// NewBarFiller constucts mpb.BarFiller, to be used with *Progress.Add(...) *Bar method.
func NewBarFiller(style string, reverse bool) BarFiller {
bf := &barFiller{
format: make([][]byte, len(DefaultBarStyle)),
rwidth: make([]int, len(DefaultBarStyle)),
reverse: reverse,
}
bf.SetStyle(style)
return bf
}
func (s *barFiller) SetStyle(style string) {
if !utf8.ValidString(style) {
panic("invalid bar style")
}
if style == "" {
style = DefaultBarStyle
}
src := make([][]byte, utf8.RuneCountInString(style))
i := 0
for _, r := range style {
s.rwidth[i] = runewidth.RuneWidth(r)
src[i] = []byte(string(r))
i++
}
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) Fill(w io.Writer, reqWidth int, stat decor.Statistics) {
width := internal.WidthForBarFiller(reqWidth, stat.AvailableWidth)
if brackets := s.rwidth[rLeft] + s.rwidth[rRight]; width < brackets {
return
} else {
// don't count brackets as progress
width -= brackets
}
w.Write(s.format[rLeft])
defer w.Write(s.format[rRight])
cwidth := int(internal.PercentageRound(stat.Total, stat.Current, width))
space := &space{
space: s.format[rSpace],
rwidth: s.rwidth[rSpace],
count: width - cwidth,
}
index, refill := 0, 0
bb := make([][]byte, cwidth)
if cwidth > 0 && cwidth != width {
bb[index] = s.tip
cwidth -= s.rwidth[rTip]
index++
}
if stat.Refill > 0 {
refill = int(internal.PercentageRound(stat.Total, int64(stat.Refill), width))
if refill > cwidth {
refill = cwidth
}
cwidth -= refill
}
for cwidth > 0 {
bb[index] = s.format[rFill]
cwidth -= s.rwidth[rFill]
index++
}
for refill > 0 {
bb[index] = s.format[rRefill]
refill -= s.rwidth[rRefill]
index++
}
if cwidth+refill < 0 || space.rwidth > 1 {
buf := new(bytes.Buffer)
s.flush(buf, space, bb[:index])
io.WriteString(w, runewidth.Truncate(buf.String(), width, "…"))
return
}
s.flush(w, space, bb)
}
func regularFlush(w io.Writer, space *space, bb [][]byte) {
for i := len(bb) - 1; i >= 0; i-- {
w.Write(bb[i])
}
for space.count > 0 {
w.Write(space.space)
space.count -= space.rwidth
}
}
func reverseFlush(w io.Writer, space *space, bb [][]byte) {
for space.count > 0 {
w.Write(space.space)
space.count -= space.rwidth
}
for i := 0; i < len(bb); i++ {
w.Write(bb[i])
}
}
|
