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main.go
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main.go
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package main
import (
"flag"
"io"
"log"
"os"
"os/exec"
"os/signal"
"path/filepath"
"syscall"
"time"
"github.com/creack/pty"
"github.com/fsnotify/fsnotify"
"github.com/jhowrez/tui-hotreload/pkg/options"
"github.com/muesli/cancelreader"
"golang.org/x/term"
)
var (
initialTermState *term.State
cmd *exec.Cmd
)
func init() {
var appCfgPath string
flag.StringVar(&appCfgPath, "c", "./app.yaml", "app options config path. Default ./app.yaml")
flag.Parse()
options.OptionsInit(&appCfgPath)
}
func RunCommand() *exec.Cmd {
appOptions := options.GetOptions()
err := exec.Command("/bin/bash", "-c", appOptions.Command.Build).Run()
if err != nil {
log.Printf("failed to build: %s", err)
return nil
}
cmd := exec.Command("/bin/bash", "-c", appOptions.Command.Exec)
// Set stdin in raw mode.
oldState, err := term.MakeRaw(int(os.Stdin.Fd()))
if err != nil {
panic(err)
}
if initialTermState == nil {
initialTermState = oldState
}
ptmx, err := pty.Start(cmd)
if err != nil {
log.Fatal(err)
}
// Handle pty size.
ch := make(chan os.Signal, 1)
signal.Notify(ch, syscall.SIGWINCH)
go func() {
for range ch {
if err := pty.InheritSize(os.Stdin, ptmx); err != nil {
log.Printf("error resizing pty: %s", err)
return
}
}
}()
ch <- syscall.SIGWINCH // Initial resize.
cancelReader, err := cancelreader.NewReader(os.Stdin)
if err != nil {
log.Fatal(err)
}
go func() {
_, _ = io.Copy(ptmx, cancelReader)
}()
go func() {
_, _ = io.Copy(os.Stdout, ptmx)
_ = term.Restore(int(os.Stdin.Fd()), initialTermState)
ptmx.Close()
cancelReader.Cancel()
}()
return cmd
}
func main() {
// Create new watcher.
watcher, err := fsnotify.NewWatcher()
if err != nil {
log.Fatal(err)
}
defer watcher.Close()
cmd = RunCommand()
// Start listening for events.
go func() {
for {
select {
case event, ok := <-watcher.Events:
if !ok {
return
}
if event.Has(fsnotify.Write) {
// isReloadingCommand = true
if cmd != nil {
syscall.Kill(-cmd.Process.Pid, syscall.SIGKILL)
cmd.Process.Wait()
time.Sleep(time.Millisecond * 250)
}
cmd = RunCommand()
// isReloadingCommand = false
}
case err, ok := <-watcher.Errors:
if !ok {
return
}
log.Println("error:", err)
}
}
}()
for _, pathPattern := range options.GetOptions().Watch.Folders {
// Add path.
paths, err := filepath.Glob(pathPattern)
if err != nil {
log.Fatal(err)
}
for _, path := range paths {
err = watcher.Add(path)
if err != nil {
log.Fatal(err)
}
}
}
// Block main goroutine forever.
<-make(chan struct{})
}