-
Notifications
You must be signed in to change notification settings - Fork 0
/
clickevents.go
82 lines (76 loc) · 1.89 KB
/
clickevents.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
package main
import (
"bufio"
"encoding/json"
"io"
"log"
"unicode"
)
// ClickEvent holds data sent by i3bar when the user clicks a block.
type ClickEvent struct {
Name string `json:"name"`
Instance string `json:"instance"`
Button int `json:"button"`
X int `json:"x"`
Y int `json:"y"`
}
// ClickEventsListener parses the click event stream and notifies its subscribers.
type ClickEventsListener struct {
r io.Reader
clickEventChans []chan ClickEvent
}
// NewClickEventsListener returns a ClickEventsListener which reads from r.
func NewClickEventsListener(r io.Reader) *ClickEventsListener {
return &ClickEventsListener{r: r, clickEventChans: make([]chan ClickEvent, 0)}
}
// Listen reads and decodes the click event stream and forwards them to the channels subscribers.
func (cel *ClickEventsListener) Listen() {
r := bufio.NewReader(cel.r)
dec := json.NewDecoder(r)
for {
var ce ClickEvent
// Ignore unwanted chars first
IgnoreChars:
for {
ruune, _, err := r.ReadRune()
if err != nil {
log.Println(err)
break IgnoreChars
}
switch {
case unicode.IsSpace(ruune):
// Loop again
case ruune == '[':
// Loop again
case ruune == ',':
break IgnoreChars
default:
_ = r.UnreadRune()
break IgnoreChars
}
}
err := dec.Decode(&ce)
switch {
case err == io.EOF:
log.Println("ClickEventsListener: reached EOF")
return
case err != nil:
log.Printf("ClickEventsListener: invalid JSON input: %v\n", err)
return
default:
log.Printf("Received click event %+v\n", ce)
for _, ch := range cel.clickEventChans {
sch := ch
go func() {
sch <- ce
}()
}
}
}
}
// Notify returns a channel which will be fed by incoming ClickEvents.
func (cel *ClickEventsListener) Notify() chan ClickEvent {
ch := make(chan ClickEvent)
cel.clickEventChans = append(cel.clickEventChans, ch)
return ch
}