Commit `512b3ef922`

512b3ef922b80f777ac7458b41bf2df670f0103a

Verified · cmc

cmc <hello@cleberg.net> · 2026-09-25 23:54 UTC

Rescan on filesystem changes

Layout: unified · split

go.mod +8 −2

	@@ -2,6 +2,12 @@ module gitbay.org/cmc/gallery
2		2
3	go 1.27.1	3	go 1.27.1
4		4
5	require github.com/niklasfasching/go-org v1.9.1	5	require (
		6	github.com/fsnotify/fsnotify v1.10.1
		7	github.com/niklasfasching/go-org v1.9.1
		8	)
6		9
7	require golang.org/x/net v0.38.0 // indirect	10	require (
		11	golang.org/x/net v0.38.0 // indirect
		12	golang.org/x/sys v0.31.0 // indirect
		13	)

go.sum +4

+github.com/fsnotify/fsnotify v1.10.1 h1:b0/UzAf9yR5rhf3RPm9gf3ehBPpf0oZKIjtpKrx59Ho=
+github.com/fsnotify/fsnotify v1.10.1/go.mod h1:TLheqan6HD6GBK6PrDWyDPBaEV8LspOxvPSjC+bVfgo=
 github.com/niklasfasching/go-org v1.9.1 h1:/3s4uTPOF06pImGa2Yvlp24yKXZoTYM+nsIlMzfpg/0=
 github.com/niklasfasching/go-org v1.9.1/go.mod h1:ZAGFFkWvUQcpazmi/8nHqwvARpr1xpb+Es67oUGX/48=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 golang.org/x/net v0.38.0 h1:vRMAPTMaeGqVhG5QyLJHqNDwecKTomGeqbnfZyKlBI8=
 golang.org/x/net v0.38.0/go.mod h1:ivrbrMbzFq5J41QOQh0siUuly180yBYtLp+CKbEaFx8=
+golang.org/x/sys v0.31.0 h1:ioabZlmFYtWhL+TRYpcnNlLwhyxaM9kWTDEmfnprqik=
+golang.org/x/sys v0.31.0/go.mod h1:BJP2sWEmIv4KK5OTEluFJCKSidICx8ciO85XgH3Ak8k=

internal/library/watch.go added +73

@@ -0,0 +1,73 @@
	1	package library
	2
	3	import (
	4	"context"
	5	"log"
	6	"os"
	7	"path/filepath"
	8	"strings"
	9	"time"
	10
	11	"github.com/fsnotify/fsnotify"
	12	)
	13
	14	// Watch calls onChange after filesystem activity under root has been quiet for debounce.
	15	func Watch(ctx context.Context, root string, debounce time.Duration, onChange func()) error {
	16	w, err := fsnotify.NewWatcher()
	17	if err != nil {
	18	return err
	19	}
	20	if err := addTree(w, root); err != nil {
	21	w.Close()
	22	return err
	23	}
	24	go func() {
	25	defer w.Close()
	26	timer := time.NewTimer(debounce)
	27	timer.Stop()
	28	for {
	29	select {
	30	case <-ctx.Done():
	31	return
	32	case ev, ok := <-w.Events:
	33	if !ok {
	34	return
	35	}
	36	if ev.Has(fsnotify.Create) {
	37	if fi, err := os.Stat(ev.Name); err == nil && fi.IsDir() {
	38	if err := w.Add(ev.Name); err != nil {
	39	log.Printf("watch %s: %v", ev.Name, err)
	40	}
	41	}
	42	}
	43	timer.Reset(debounce)
	44	case err, ok := <-w.Errors:
	45	if !ok {
	46	return
	47	}
	48	log.Printf("watch: %v", err)
	49	case <-timer.C:
	50	onChange()
	51	}
	52	}
	53	}()
	54	return nil
	55	}
	56
	57	func addTree(w *fsnotify.Watcher, root string) error {
	58	if err := w.Add(root); err != nil {
	59	return err
	60	}
	61	entries, err := os.ReadDir(root)
	62	if err != nil {
	63	return err
	64	}
	65	for _, e := range entries {
	66	if e.IsDir() && !strings.HasPrefix(e.Name(), ".") {
	67	if err := w.Add(filepath.Join(root, e.Name())); err != nil {
	68	return err
	69	}
	70	}
	71	}
	72	return nil
	73	}

internal/library/watch_test.go added +45

@@ -0,0 +1,45 @@
	1	package library
	2
	3	import (
	4	"context"
	5	"os"
	6	"path/filepath"
	7	"testing"
	8	"time"
	9	)
	10
	11	func expectCall(t *testing.T, ch <-chan struct{}, what string) {
	12	t.Helper()
	13	select {
	14	case <-ch:
	15	case <-time.After(3 * time.Second):
	16	t.Fatalf("no onChange after %s", what)
	17	}
	18	}
	19
	20	func TestWatchDebouncesAndFollowsNewDirs(t *testing.T) {
	21	root := writeTree(t, map[string]string{"tokyo/a.jpg": "x"})
	22	ctx, cancel := context.WithCancel(context.Background())
	23	defer cancel()
	24
	25	calls := make(chan struct{}, 10)
	26	if err := Watch(ctx, root, 100*time.Millisecond, func() { calls <- struct{}{} }); err != nil {
	27	t.Fatal(err)
	28	}
	29
	30	for _, n := range []string{"b.jpg", "c.jpg", "d.jpg"} {
	31	os.WriteFile(filepath.Join(root, "tokyo", n), []byte("x"), 0o644)
	32	}
	33	expectCall(t, calls, "writes in existing album")
	34	select {
	35	case <-calls:
	36	t.Fatal("burst of writes produced more than one call")
	37	case <-time.After(300 * time.Millisecond):
	38	}
	39
	40	os.Mkdir(filepath.Join(root, "iceland"), 0o755)
	41	expectCall(t, calls, "new album dir")
	42	time.Sleep(150 * time.Millisecond) // let the watcher add the new dir
	43	os.WriteFile(filepath.Join(root, "iceland", "a.jpg"), []byte("x"), 0o644)
	44	expectCall(t, calls, "write in new album")
	45	}

Commit 512b3ef922