1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
|
package mpb
import (
"bytes"
"io"
"unicode/utf8"
"github.com/mattn/go-runewidth"
"github.com/rivo/uniseg"
"github.com/vbauerster/mpb/v6/decor"
"github.com/vbauerster/mpb/v6/internal"
)
const (
rLeft = iota
rFill
rTip
rSpace
rRight
rRevTip
rRefill
)
// BarDefaultStyle is a style for rendering a progress bar.
// It consist of 7 ordered runes:
//
// '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 BarDefaultStyle 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 returns a BarFiller implementation which renders a
// progress bar in regular direction. If style is empty string,
// BarDefaultStyle is applied. To be used with `*Progress.Add(...)
// *Bar` method.
func NewBarFiller(style string) BarFiller {
return newBarFiller(style, false)
}
// NewBarFillerRev returns a BarFiller implementation which renders a
// progress bar in reverse direction. If style is empty string,
// BarDefaultStyle is applied. To be used with `*Progress.Add(...)
// *Bar` method.
func NewBarFillerRev(style string) BarFiller {
return newBarFiller(style, true)
}
// NewBarFillerPick pick between regular and reverse BarFiller implementation
// based on rev param. To be used with `*Progress.Add(...) *Bar` method.
func NewBarFillerPick(style string, rev bool) BarFiller {
return newBarFiller(style, rev)
}
func newBarFiller(style string, rev bool) BarFiller {
bf := &barFiller{
format: make([][]byte, len(BarDefaultStyle)),
rwidth: make([]int, len(BarDefaultStyle)),
reverse: rev,
}
bf.parse(BarDefaultStyle)
if style != "" && style != BarDefaultStyle {
bf.parse(style)
}
return bf
}
func (s *barFiller) parse(style string) {
if !utf8.ValidString(style) {
panic("invalid bar style")
}
srcFormat := make([][]byte, len(BarDefaultStyle))
srcRwidth := make([]int, len(BarDefaultStyle))
i := 0
for gr := uniseg.NewGraphemes(style); i < len(BarDefaultStyle) && gr.Next(); i++ {
srcFormat[i] = gr.Bytes()
srcRwidth[i] = runewidth.StringWidth(gr.Str())
}
copy(s.format, srcFormat[:i])
copy(s.rwidth, srcRwidth[:i])
if s.reverse {
s.tip = s.format[rRevTip]
s.flush = reverseFlush
} else {
s.tip = s.format[rTip]
s.flush = regularFlush
}
}
func (s *barFiller) Fill(w io.Writer, reqWidth int, stat decor.Statistics) {
width := internal.CheckRequestedWidth(reqWidth, stat.AvailableWidth)
brackets := s.rwidth[rLeft] + s.rwidth[rRight]
if width < brackets {
return
}
// 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])
}
}
|
