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
|
package main
import (
"fmt"
"math"
"time"
tui "github.com/grindlemire/go-tui"
)
type streamingApp struct {
dataCh <-chan string
lines *tui.State[[]string]
scrollY *tui.State[int]
stickToBottom *tui.State[bool]
elapsed *tui.State[int]
content *tui.Ref
}
func Streaming(dataCh <-chan string) *streamingApp {
return &streamingApp{
dataCh: dataCh,
lines: tui.NewState([]string{}),
scrollY: tui.NewState(0),
stickToBottom: tui.NewState(true),
elapsed: tui.NewState(0),
content: tui.NewRef(),
}
}
func (s *streamingApp) scrollBy(delta int) {
el := s.content.El()
if el == nil {
return
}
_, maxY := el.MaxScroll()
newY := s.scrollY.Get() + delta
if newY < 0 {
newY = 0
} else if newY > maxY {
newY = maxY
}
s.scrollY.Set(newY)
s.stickToBottom.Set(newY >= maxY)
}
func (s *streamingApp) KeyMap() tui.KeyMap {
return tui.KeyMap{
tui.On(tui.Rune('q'), func(ke tui.KeyEvent) { ke.App().Stop() }),
tui.On(tui.KeyEscape, func(ke tui.KeyEvent) { ke.App().Stop() }),
tui.On(tui.Rune('j'), func(ke tui.KeyEvent) { s.scrollBy(1) }),
tui.On(tui.Rune('k'), func(ke tui.KeyEvent) { s.scrollBy(-1) }),
tui.On(tui.KeyUp, func(ke tui.KeyEvent) { s.scrollBy(-1) }),
tui.On(tui.KeyDown, func(ke tui.KeyEvent) { s.scrollBy(1) }),
tui.On(tui.KeyPageUp, func(ke tui.KeyEvent) { s.scrollBy(-10) }),
tui.On(tui.KeyPageDown, func(ke tui.KeyEvent) { s.scrollBy(10) }),
tui.On(tui.KeyHome, func(ke tui.KeyEvent) {
s.scrollY.Set(0)
s.stickToBottom.Set(false)
}),
tui.On(tui.KeyEnd, func(ke tui.KeyEvent) {
s.scrollY.Set(math.MaxInt)
s.stickToBottom.Set(true)
}),
tui.On(tui.Rune(' '), func(ke tui.KeyEvent) {
if s.stickToBottom.Get() {
s.stickToBottom.Set(false)
} else {
s.scrollY.Set(math.MaxInt)
s.stickToBottom.Set(true)
}
}),
}
}
func (s *streamingApp) HandleMouse(me tui.MouseEvent) bool {
switch me.Button {
case tui.MouseWheelUp:
s.scrollBy(-1)
return true
case tui.MouseWheelDown:
s.scrollBy(1)
return true
}
return false
}
func (s *streamingApp) Watchers() []tui.Watcher {
return []tui.Watcher{
tui.OnTimer(time.Second, s.tick),
tui.Watch(s.dataCh, s.addLine),
}
}
func (s *streamingApp) tick() {
s.elapsed.Set(s.elapsed.Get() + 1)
}
func (s *streamingApp) addLine(line string) {
current := s.lines.Get()
s.lines.Set(append(current, line))
if s.stickToBottom.Get() {
s.scrollY.Set(math.MaxInt)
}
}
func lineColor(line string) string {
if len(line) < 20 {
return ""
}
// Color based on metric type
for i := 0; i < len(line)-3; i++ {
sub := line[i : i+3]
if sub == "cpu" {
return "text-cyan"
}
if sub == "mem" {
return "text-magenta"
}
if sub == "net" {
return "text-green"
}
if sub == "dis" {
return "text-yellow"
}
if sub == "io:" {
return "text-blue"
}
}
return ""
}
templ (s *streamingApp) Render() {
<div class="flex-col gap-1 p-1 h-full border-rounded border-cyan">
<div class="flex justify-between shrink-0">
<span class="text-gradient-cyan-magenta font-bold shrink-0">Live Stream</span>
<span class="text-cyan font-bold" minWidth={0}>{fmt.Sprintf("%d lines", len(s.lines.Get()))}</span>
</div>
<div
ref={s.content}
class="flex-col flex-grow border-single p-1"
scrollable={tui.ScrollVertical}
scrollOffset={0, s.scrollY.Get()}
>
for _, line := range s.lines.Get() {
<span class={lineColor(line)}>{line}</span>
}
</div>
<div class="flex gap-2 shrink-0 justify-center">
<span class="font-dim">Elapsed:</span>
<span class="text-cyan font-bold">{fmt.Sprintf("%ds", s.elapsed.Get())}</span>
<span class="font-dim">Auto-scroll:</span>
if s.stickToBottom.Get() {
<span class="text-green font-bold">ON</span>
} else {
<span class="text-yellow">OFF</span>
}
</div>
<span class="font-dim shrink-0">j/k scroll | Space toggle auto-scroll | q quit</span>
</div>
}
|