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main.go
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main.go
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package main
import (
"bufio"
"flag"
"fmt"
"log"
"os"
"os/exec"
"os/signal"
"strings"
"time"
"github.com/fsnotify/fsnotify"
)
var startChannel chan string
var stopChannel chan bool
var done chan bool
var started bool
var filePath *string
func main() {
filePath = flag.String("f", "", "file path")
flag.Parse()
if len(*filePath) == 0 {
fmt.Fprintf(os.Stderr, "usage: %s [file path]\n", os.Args[0])
flag.PrintDefaults()
return
}
startChannel = make(chan string)
stopChannel = make(chan bool)
done = make(chan bool)
started = false
watch()
start()
startChannel <- *filePath
<-done
}
func start() {
go func() {
for {
log.Println("Watching...", <-startChannel)
time.Sleep(500 * time.Millisecond)
if started {
stopChannel <- true
}
buildAndRun(*filePath)
started = true
log.Printf(strings.Repeat("-", 20))
}
}()
waitInterrupt()
}
func watch() {
watcher, err := fsnotify.NewWatcher()
if err != nil {
log.Fatal(err)
}
go func() {
for {
select {
case event := <-watcher.Events:
if event.Op&fsnotify.Write == fsnotify.Write {
startChannel <- event.Name
}
case err := <-watcher.Errors:
if err != nil {
log.Println("error: ", err)
}
}
}
}()
err = watcher.Add(*filePath)
if err != nil {
log.Fatal(err)
}
}
func buildPath() string {
return "/tmp/executable.cmd"
}
func buildAndRun(f string) {
build(f)
run(f)
}
func build(f string) {
log.Println("Building...")
cmd := exec.Command("go", "build", "-o", buildPath(), f)
stdout, err := cmd.StdoutPipe()
if err != nil {
panic(err)
}
err = cmd.Start()
if err != nil {
panic(err)
}
go func() {
in := bufio.NewScanner(stdout)
for in.Scan() {
log.Printf(in.Text()) // write each line to your log, or anything you need
}
if err := in.Err(); err != nil {
log.Printf("error: %s", err)
}
}()
err = cmd.Wait()
if err != nil {
log.Fatal(err)
}
}
func run(f string) {
log.Println("Running...")
cmd := exec.Command(buildPath())
stdout, err := cmd.StdoutPipe()
if err != nil {
panic(err)
}
err = cmd.Start()
if err != nil {
panic(err)
}
go func() {
in := bufio.NewScanner(stdout)
for in.Scan() {
log.Printf(in.Text()) // write each line to your log, or anything you need
}
if err := in.Err(); err != nil {
log.Printf("error: %s", err)
}
}()
go func() {
<-stopChannel
pid := cmd.Process.Pid
log.Println("Killing PID ", pid)
cmd.Process.Kill()
}()
}
func waitInterrupt() {
signalChan := make(chan os.Signal, 1)
signal.Notify(signalChan, os.Interrupt)
go func() {
<-signalChan
fmt.Println("Received an interrupt, stopping services...")
if _, err := os.Stat(buildPath()); err == nil {
os.Remove(buildPath())
}
done <- true
}()
}