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
|
// [PROGRAM] will run a build command and a run command on file system changes. This is so you can
// build&run on save.
// You specify a build command and run command as flags and optionally you can filter by extension.
package main
import (
"flag"
"fmt"
"os"
"os/exec"
"runtime/debug"
"strings"
"github.com/fsnotify/fsnotify"
)
// Colors in escape sequences
var (
Reset = "\033[0m"
BoldCyan = "\033[36m"
// Red = "\033[31m"
// Green = "\033[32m"
// Yellow = "\033[33m"
// Blue = "\033[34m"
// Magenta = "\033[35m"
// Cyan = "\033[36m"
// Gray = "\033[37m"
// White = "\033[97m"
)
var (
// Path in which to look for commands
Path string
// Command run for building
BuildCommand []string
// Command run after build
RunCommand []string
// Command will only run on files that have the Ext extension
Ext string
// Version tag for wbr
Version string
)
func GetVersion() string {
if Version != "" {
return Version
}
buildinfo, ok := debug.ReadBuildInfo()
if !ok {
panic("Could not read buildinfo to know package version.")
}
return buildinfo.Main.Version
}
func CompileRun(fileName string) {
if !strings.HasSuffix(fileName, Ext) {
return
}
// Build the program, exit if return if there was an error
{
var buildCmd *exec.Cmd
if len(BuildCommand) > 1 {
buildCmd = exec.Command(BuildCommand[0], append(BuildCommand[1:], fileName)...)
} else {
buildCmd = exec.Command(BuildCommand[0], fileName)
}
// run the build command
out, err := buildCmd.CombinedOutput()
if len(BuildCommand) > 1 {
fmt.Printf("\n[%s%s %s%s]\n", BoldCyan, BuildCommand[0], strings.Join(append(BuildCommand[1:], fileName), " "), Reset)
} else {
fmt.Printf("[%s%s %s %s%s]\n", BoldCyan, BuildCommand[0], BuildCommand, fileName, Reset)
}
if len(out) > 0 {
fmt.Printf("%s", out)
}
if err != nil {
if _, ok := err.(*exec.ExitError); ok {
return
} else if !ok {
panic(err)
}
}
}
// There was no error in the build so we can execute the run command
{
var runCmd *exec.Cmd
if len(RunCommand) > 1 {
runCmd = exec.Command(RunCommand[0], RunCommand[1:]...)
} else {
runCmd = exec.Command(RunCommand[0])
}
out, err := runCmd.CombinedOutput()
if len(RunCommand) > 1 {
fmt.Printf("[%s%s %s%s]\n", BoldCyan, RunCommand[0], strings.Join(append(RunCommand[1:]), " "), Reset)
} else {
fmt.Printf("[%s%s%s]\n", BoldCyan, RunCommand[0], Reset)
}
if len(out) > 0 {
fmt.Printf("%s", out)
}
if err != nil {
if _, ok := err.(*exec.ExitError); ok {
return
} else if !ok {
panic(err)
}
}
}
}
func main() {
watcher, err := fsnotify.NewWatcher()
if err != nil {
panic(err)
}
defer watcher.Close()
bc := flag.String("b", "", "Command to run for building")
rc := flag.String("r", "", "Command for running after build")
e := flag.String("e", "", "Filter watched files by suffix")
p := flag.String("p", ".", "Path to watch for files")
v := flag.Bool("v", false, "Show wbr version")
flag.Parse()
if *v {
fmt.Printf("wbr %s\n", GetVersion())
os.Exit(0)
}
if *bc == "" {
fmt.Println("flag is required: -b")
os.Exit(1)
}
BuildCommand = strings.Split(*bc, " ")
RunCommand = strings.Split(*rc, " ")
Ext = *e
Path = *p
fmt.Printf("[%swatching '%s'%s]", BoldCyan, Path, Reset)
go func() {
for {
select {
case event, ok := <-watcher.Events:
if !ok {
return
}
if event.Has(fsnotify.Write) {
CompileRun(event.Name)
}
case err, ok := <-watcher.Errors:
if !ok {
return
}
fmt.Println("error:", err)
}
}
}()
err = watcher.Add(Path)
if err != nil {
panic(err)
}
<-make(chan struct{})
}
|
