allow to build without fsnotify

Makefile

@@ -25,6 +25,7 @@ bin: clutter
 .PHONY: clutter
 clutter:
 	go build -o $(BINDIR)/clutter $(GO_BUILD_OPTS) ./cmd/clutter
+	go build -o $(BINDIR)/clutter-nofsnotify --tags nofsnotify $(GO_BUILD_OPTS) ./cmd/clutter
 
 .PHONY: test
 test: test-unit test-end-to-end

README.md

@@ -237,7 +237,6 @@ make install
 
 See [releases](https://github.com/cluttercode/clutter/releases).
 
-
 ## TODO
 
 - [ ] More tests.

cmd/clutter/cmd_index.go

@@ -6,7 +6,6 @@ import (
 	"path/filepath"
 	"time"
 
-	"github.com/fsnotify/fsnotify"
 	cli "github.com/urfave/cli/v2"
 
 	"github.com/cluttercode/clutter/internal/pkg/index"
@@ -100,7 +99,7 @@ var (
 					return nil
 				}
 
-				watcher, err := fsnotify.NewWatcher()
+				watcher, err := fsnNewWatcher()
 				if err != nil {
 					return fmt.Errorf("watcher: %w", err)
 				}
@@ -153,7 +152,7 @@ var (
 							return
 
 						case event := <-watcher.Events:
-							if event.Op&(fsnotify.Write|fsnotify.Remove|fsnotify.Rename|fsnotify.Create) != 0 {
+							if event.Op&(fsnWrite|fsnRemove|fsnRename|fsnCreate) != 0 {
 								z.Infow("file modified", "event", event.Name)
 								done <- errRefresh
 								return

cmd/clutter/fsnotify_real.go

@@ -0,0 +1,16 @@
+// +build !nofsnotify
+
+package main
+
+import (
+	"github.com/fsnotify/fsnotify"
+)
+
+var (
+	fsnCreate = fsnotify.Create
+	fsnWrite  = fsnotify.Write
+	fsnRemove = fsnotify.Remove
+	fsnRename = fsnotify.Rename
+)
+
+var fsnNewWatcher = fsnotify.NewWatcher

cmd/clutter/fsnotify_stub.go

@@ -0,0 +1,31 @@
+// +build nofsnotify
+
+package main
+
+import "errors"
+
+type Op uint32
+
+const (
+	fsnCreate Op = iota
+	fsnWrite
+	fsnRemove
+	fsnRename
+)
+
+type Event struct {
+	Name string
+	Op   Op
+}
+
+type Watcher struct {
+	Errors chan error
+	Events chan Event
+}
+
+func (w *Watcher) Add(name string) error { return nil }
+func (w *Watcher) Close() error          { return nil }
+
+func fsnNewWatcher() (*Watcher, error) {
+	return nil, errors.New("fsnotify is not supported")
+}