forked from c-bata/go-prompt
-
Notifications
You must be signed in to change notification settings - Fork 0
/
render.go
235 lines (200 loc) · 5.72 KB
/
render.go
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
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
package prompt
import (
"github.com/c-bata/go-prompt/internal/debug"
runewidth "github.com/mattn/go-runewidth"
)
const (
scrollBarWidth = 1
statusBarHeight = 1
)
// Render to render prompt information from state of Buffer.
type Render struct {
out ConsoleWriter
prefix string
livePrefixCallback func(doc *Document, breakline bool) (prefix string, useLivePrefix bool)
breakLineCallback func(doc *Document)
title string
row uint16
col uint16
stringCaches bool
statusBar StatusBar
allocatedLines int
enableMarkup bool
previousCursor int
// colors,
prefixTextColor Color
prefixBGColor Color
inputTextColor Color
inputBGColor Color
previewSuggestionTextColor Color
previewSuggestionBGColor Color
inlineTextColor Color
inlineBGColor Color
suggestionTextColor Color
suggestionBGColor Color
selectedSuggestionTextColor Color
selectedSuggestionBGColor Color
descriptionTextColor Color
descriptionBGColor Color
selectedDescriptionTextColor Color
selectedDescriptionBGColor Color
scrollbarThumbColor Color
scrollbarBGColor Color
statusBarTextColor Color
statusBarBGColor Color
suggestTypeLabelTextColor Color
suggestTypeLabelBGColor Color
}
// Setup to initialize console output.
func (r *Render) Setup() {
if r.title != "" {
r.out.SetTitle(r.title)
debug.AssertNoError(r.out.Flush())
}
}
// TearDown to clear title and erasing.
func (r *Render) TearDown() {
r.out.ClearTitle()
r.out.EraseDown()
debug.AssertNoError(r.out.Flush())
}
// Render renders to the console.
func (r *Render) Render(buffer *Buffer, completion *CompletionManager, lexer *Lexer) {
// In situations where a pseudo tty is allocated (e.g. within a docker container),
// window size via TIOCGWINSZ is not immediately available and will result in 0,0 dimensions.
if r.col == 0 {
return
}
defer func() { debug.AssertNoError(r.out.Flush()) }()
d := buffer.Document()
line := d.Text
lw := runewidth.StringWidth(line)
rows := lw / int(r.col)
r.allocateArea(rows + statusBarHeight)
r.eraseArea(rows)
r.move(r.previousCursor, 0)
// TODO: it feels like the above should account for the prefix width; investigate
prefix := r.getCurrentPrefix(buffer, false)
pw := runewidth.StringWidth(prefix)
cursor := pw + lw
// Ensure area size is large enough to work with
_, y := r.toPos(cursor)
h := y + int(completion.max) + statusBarHeight
if h > int(r.row) || completionMargin > int(r.col) {
r.renderWindowTooSmall()
return
}
// Rendering
r.out.HideCursor()
defer r.out.ShowCursor()
// TODO: reset to start of line (without messing up cursor tracking) to allow
// for previous cursor to be overwritten if the prompt is restarted
r.renderPrefix(buffer, false)
r.eraseArea(0)
// Render lexed input line
lexed := lexer.Process(*d)
left, right, _, back := splitLexedAtCursor(lexed, d.cursorPosition)
r.renderLexed(left)
if y == 0 {
// TODO: is this still needed?
r.out.EraseEndOfLine()
}
cursor, preview := r.renderPreview(d, completion, cursor)
r.renderLexed(right)
if preview == "" {
c, iw := r.renderInline(d, completion, cursor)
cursor = c
back += iw
}
// Prepare to render completion
r.out.SetColor(DefaultColor, DefaultColor, false)
r.lineWrap(cursor)
cursor = r.backward(cursor, back)
// Render completion components
r.renderCompletion(buffer, completion)
r.previousCursor = cursor
}
// UpdateWinSize called when window size is changed.
func (r *Render) UpdateWinSize(ws *WinSize) {
r.row = ws.Row
r.col = ws.Col
}
// BreakLine to break line.
func (r *Render) BreakLine(buffer *Buffer, lexer *Lexer) {
d := buffer.Document()
// Erasing and Render
prefix := r.getCurrentPrefix(buffer, true)
cursor := runewidth.StringWidth(d.TextBeforeCursor()) + runewidth.StringWidth(prefix)
r.clear(cursor)
r.renderPrefix(buffer, true)
r.renderLexable(*d, lexer)
r.out.WriteStr("\n")
r.out.SetColor(DefaultColor, DefaultColor, false)
debug.AssertNoError(r.out.Flush())
if r.breakLineCallback != nil {
r.breakLineCallback(d)
}
r.previousCursor = 0
}
func (r *Render) allocateArea(lines int) {
for i := 0; i < lines; i++ {
r.out.ScrollDown()
}
for i := 0; i < lines; i++ {
r.out.ScrollUp()
}
if r.allocatedLines < lines {
r.allocatedLines = lines
}
}
func (r *Render) eraseArea(skip int) {
r.out.SaveCursor()
defer r.out.UnSaveCursor()
lines := r.allocatedLines
for i := 0; i < lines; i++ {
r.out.CursorDown(1)
if i >= skip {
r.out.EraseLine()
}
}
}
// clear erases the screen from a beginning of input
// even if there is line break which means input length exceeds a window's width.
func (r *Render) clear(cursor int) {
r.move(cursor, 0)
r.out.EraseDown()
}
// backward moves cursor to backward from a current cursor position
// regardless there is a line break.
func (r *Render) backward(from, n int) int {
return r.move(from, from-n)
}
// move cursor to specified position from the beginning of input
// even if there is a line break.
func (r *Render) move(from, to int) int {
fromX, fromY := r.toPos(from)
toX, toY := r.toPos(to)
r.out.CursorUp(fromY - toY)
r.out.CursorBackward(fromX - toX)
return to
}
// toPos returns the relative position from the beginning of the string.
func (r *Render) toPos(cursor int) (x, y int) {
col := int(r.col)
return cursor % col, cursor / col
}
func (r *Render) lineWrap(cursor int) {
if cursor > 0 && cursor%int(r.col) == 0 {
r.out.WriteRaw([]byte{'\n'})
}
}
func clamp(high, low, x float64) float64 {
switch {
case high < x:
return high
case x < low:
return low
default:
return x
}
}