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main.go
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main.go
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package main
import (
"flag"
"fmt"
"os"
"os/exec"
"time"
"github.com/fsnotify/fsnotify"
)
const (
groveError string = "grove: %s\n"
fsnotifyError string = "grove: fsnotify: %s\n"
)
func main() {
flag.Usage = optionHelp
flag.Parse()
args := flag.Args()
if len(args) == 0 {
fmt.Printf(groveError, "try 'grove --help' for more information")
return
}
watcher, err := fsnotify.NewWatcher()
if err != nil {
fmt.Printf(fsnotifyError, err)
return
}
defer watcher.Close()
if len(args) == 0 {
fmt.Printf(groveError, "no file specified")
return
}
err = watcher.Add(args[0])
if err != nil {
fmt.Printf(fsnotifyError, err)
return
}
args = args[1:]
var debounceTime time.Time = time.Unix(0, 0)
for {
select {
case event, ok := <-watcher.Events:
if !ok {
return
}
if event.Op&fsnotify.Write == fsnotify.Write {
if debounceTime.UnixNano() > time.Now().UnixNano() {
continue
}
debounceTime = time.Now().Add(time.Duration(debounce) * time.Second)
if len(args) == 0 {
continue
}
go func() {
for _, command := range args {
go func(command string) {
cmd := exec.Command("sh", "-c", command)
cmd.Stderr = os.Stderr
cmd.Stdin = os.Stdin
cmd.Stdout = os.Stdout
if err := cmd.Run(); err != nil {
fmt.Printf(groveError, err)
}
}(command)
}
}()
}
case err, ok := <-watcher.Errors:
if !ok {
return
}
fmt.Printf(fsnotifyError, err)
}
}
}