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
|
/*******************************************************************************
*
* Copyright 2017 Stefan Majewsky <majewsky@gmx.net>
*
* This program is free software: you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any later
* version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
* A PARTICULAR PURPOSE. See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along with
* this program. If not, see <http://www.gnu.org/licenses/>.
*
*******************************************************************************/
package i3status
import (
"encoding/json"
"fmt"
"os"
"sort"
"time"
)
//Exec executes the i3status applet and returns an exit code (0 for
//success, >0 for error).
func Exec(args []string) int {
//start protocol (we handle errors here for once because if stdout is
//working, we have nothing left to do)
_, err := os.Stdout.Write([]byte("{\"version\":1}\n[\n"))
if err != nil {
fmt.Fprintf(os.Stderr, err.Error())
return 1
}
//main loop
currentBlocks := make(map[string][]Block)
for {
//prepare clock (this is inline instead of split into a separate function
//because the wallclock also drives the main loop's clock, see below)
now := time.Now()
currentBlocks["clock"] = []Block{
{
Name: "clock",
Instance: "date",
Position: PositionClock,
FullText: now.Format("2006-01-02"),
ShortText: " ",
Color: "#AAAAAA",
},
{
Name: "clock",
Instance: "time",
Position: PositionClock,
FullText: now.Format("15:04:05"),
},
}
//put blocks in rendering order
var allBlocks []Block
for _, blocks := range currentBlocks {
allBlocks = append(allBlocks, blocks...)
}
sort.Sort(byPositionAndInstance(allBlocks))
//write output
buf, err := json.Marshal(allBlocks)
if err == nil {
os.Stdout.Write(append(buf, ',', '\n'))
} else {
//this should not happen, but if it does, fall back to just encoding the
//error string (which always works, otherwise wtf)
buf, _ = json.Marshal(err.Error())
fmt.Printf(
`[{"name":"error","urgent":true,"color":"#FF0000","full_text":%s}],`,
string(buf),
)
}
//sleep until the next second starts, so that the clock is always on time
nsec := 1000000000 - now.Nanosecond()
time.Sleep(time.Duration(nsec) * time.Nanosecond)
}
return 0
}
//Block is a block of text as used in the i3status protocol.
//(Not all attributes are represented.)
type Block struct {
Position Position `json:"-"`
Name string `json:"name"` //REQUIRED
Instance string `json:"instance,omitempty"`
FullText string `json:"full_text"` //REQUIRED
ShortText string `json:"short_text"`
Color string `json:"color,omitempty"` //CSS hex syntax, e.g. #123456
BackgroundColor string `json:"background,omitempty"`
MinWidth uint `json:"min_width,omitempty"`
Alignment Alignment `json:"align,omitempty"` //only plausible with MinWidth
Urgent bool `json:"urgent,omitempty"`
Separator bool `json:"separator"`
SeparatorBlockWidth int `json:"separator_block_width,omitempty"`
}
type byPositionAndInstance []Block
func (b byPositionAndInstance) Len() int { return len(b) }
func (b byPositionAndInstance) Swap(i, j int) { b[i], b[j] = b[j], b[i] }
func (b byPositionAndInstance) Less(i, j int) bool {
if b[i].Position == b[j].Position {
return b[i].Instance < b[j].Instance
}
return b[i].Position < b[j].Position
}
//Alignment is the alignment of a Block.
type Alignment string
//Acceptable values for Alignment.
const (
AlignmentLeft Alignment = "left"
AlignmentCenter Alignment = "center"
AlignmentRight Alignment = "right"
)
//Position defines how blocks are ordered.
type Position int
//Acceptable values for Position, from left to right.
const (
PositionNone Position = iota
PositionClock
)
|
