aboutsummaryrefslogtreecommitdiffstats
path: root/widgets/exline.go
blob: 8b1873611aec8e0b5b185caffbf0a57e2f42c28a (plain) (blame)
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
package widgets

import (
	"github.com/gdamore/tcell"
	"github.com/mattn/go-runewidth"

	"git.sr.ht/~sircmpwn/aerc2/lib/ui"
)

// TODO: history
// TODO: tab completion
// TODO: scrolling

type ExLine struct {
	ui.Invalidatable
	command []rune
	commit  func(cmd string)
	ctx     *ui.Context
	cancel  func()
	cells   int
	focus   bool
	index   int
	scroll  int

	onInvalidate func(d ui.Drawable)
}

func NewExLine(commit func(cmd string), cancel func()) *ExLine {
	return &ExLine{
		cancel:  cancel,
		cells:   -1,
		commit:  commit,
		command: []rune{},
	}
}

func (ex *ExLine) Invalidate() {
	ex.DoInvalidate(ex)
}

func (ex *ExLine) Draw(ctx *ui.Context) {
	ex.ctx = ctx // gross
	ctx.Fill(0, 0, ctx.Width(), ctx.Height(), ' ', tcell.StyleDefault)
	ctx.Printf(0, 0, tcell.StyleDefault, ":%s", string(ex.command))
	cells := runewidth.StringWidth(string(ex.command[:ex.index]))
	if cells != ex.cells {
		ctx.SetCursor(cells+1, 0)
	}
}

func (ex *ExLine) Focus(focus bool) {
	ex.focus = focus
	if focus && ex.ctx != nil {
		cells := runewidth.StringWidth(string(ex.command[:ex.index]))
		ex.ctx.SetCursor(cells+1, 0)
	}
}

func (ex *ExLine) insert(ch rune) {
	left := ex.command[:ex.index]
	right := ex.command[ex.index:]
	ex.command = append(left, append([]rune{ch}, right...)...)
	ex.index++
	ex.Invalidate()
}

func (ex *ExLine) deleteWord() {
	// TODO: Break on any of / " '
	if len(ex.command) == 0 {
		return
	}
	i := ex.index - 1
	if ex.command[i] == ' ' {
		i--
	}
	for ; i >= 0; i-- {
		if ex.command[i] == ' ' {
			break
		}
	}
	ex.command = append(ex.command[:i+1], ex.command[ex.index:]...)
	ex.index = i + 1
	ex.Invalidate()
}

func (ex *ExLine) deleteChar() {
	if len(ex.command) > 0 && ex.index != len(ex.command) {
		ex.command = append(ex.command[:ex.index], ex.command[ex.index+1:]...)
		ex.Invalidate()
	}
}

func (ex *ExLine) backspace() {
	if len(ex.command) > 0 && ex.index != 0 {
		ex.command = append(ex.command[:ex.index-1], ex.command[ex.index:]...)
		ex.index--
		ex.Invalidate()
	}
}

func (ex *ExLine) Event(event tcell.Event) bool {
	switch event := event.(type) {
	case *tcell.EventKey:
		switch event.Key() {
		case tcell.KeyBackspace, tcell.KeyBackspace2:
			ex.backspace()
		case tcell.KeyCtrlD, tcell.KeyDelete:
			ex.deleteChar()
		case tcell.KeyCtrlB, tcell.KeyLeft:
			if ex.index > 0 {
				ex.index--
				ex.Invalidate()
			}
		case tcell.KeyCtrlF, tcell.KeyRight:
			if ex.index < len(ex.command) {
				ex.index++
				ex.Invalidate()
			}
		case tcell.KeyCtrlA, tcell.KeyHome:
			ex.index = 0
			ex.Invalidate()
		case tcell.KeyCtrlE, tcell.KeyEnd:
			ex.index = len(ex.command)
			ex.Invalidate()
		case tcell.KeyCtrlW:
			ex.deleteWord()
		case tcell.KeyEnter:
			if ex.ctx != nil {
				ex.ctx.HideCursor()
			}
			ex.commit(string(ex.command))
		case tcell.KeyEsc, tcell.KeyCtrlC:
			if ex.ctx != nil {
				ex.ctx.HideCursor()
			}
			ex.cancel()
		case tcell.KeyRune:
			ex.insert(event.Rune())
		}
	}
	return true
}