main.go (view raw)
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 | package main
import (
"context"
"flag"
"log"
"os"
"os/signal"
"slices"
"strings"
"sync"
"syscall"
"time"
"github.com/fsnotify/fsnotify"
"alin.ovh/erl/command"
"alin.ovh/erl/state"
"alin.ovh/erl/watcher"
)
var (
Exec = flag.String("exec", "", "command to execute on file change")
)
func Start(ctx context.Context, w watcher.Watcher, sm *state.StateMachine) {
var wg sync.WaitGroup
wg.Add(1)
go func(events <-chan watcher.Event, errors <-chan error) {
defer wg.Done()
sm.SendEvent(state.Start)
for {
select {
case <-ctx.Done():
sm.SendEvent(state.Signal)
return
case event, ok := <-events:
if !ok {
return
}
// skip if _only_ chmod
if event.Op == fsnotify.Chmod {
continue
}
log.Printf("event: %s %s\n", event.Name, event.Op.String())
if event.Op.Has(fsnotify.Create) {
stat, err := os.Stat(event.Name)
if err != nil {
log.Printf("Error getting file info: %v\n", err)
continue
}
if stat.IsDir() {
err = w.AddRecursive(event.Name)
if err != nil {
log.Printf("Error adding directory to watcher: %v\n", err)
}
}
}
if event.Op.Has(fsnotify.Remove) {
for _, dir := range w.WatchList() {
if strings.HasPrefix(dir, event.Name) {
err := w.Remove(dir)
if err != nil {
log.Printf("Error removing directory from watcher: %v\n", err)
}
}
}
}
sm.SendEvent(state.Restart)
time.Sleep(100 * time.Millisecond)
case err, ok := <-errors:
if !ok {
return
}
log.Printf("Error: %v\n", err)
}
}
}(w.Monitor())
err := w.AddRecursive(".")
if err != nil {
log.Fatalf("failed to add directory to watcher: %v", err)
}
<-ctx.Done()
log.Println("shutting down")
sm.SendEvent(state.Signal)
wg.Wait()
}
func main() {
log.SetFlags(log.Lmsgprefix)
flag.Parse()
program := *Exec
args := flag.Args()
if program == "" {
program = "go"
if len(args) == 0 {
args = []string{"run", "."}
} else {
args = slices.Insert(args, 0, "run")
}
}
watcher, err := watcher.New()
if err != nil {
log.Fatal(err)
}
defer watcher.Close()
ctx, cancel := signal.NotifyContext(
context.Background(),
os.Interrupt,
syscall.SIGHUP,
syscall.SIGTERM,
)
defer cancel()
cmd := command.New(program, args, command.Options{})
sm := state.New(cmd, log.New(os.Stderr, "state: ", log.Lmsgprefix))
Start(ctx, watcher, sm)
}
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