fix: mount only mounts directories if they exist

NOTES.md

@@ -0,0 +1,25 @@
+# Notes
+
+(new notes at the top)
+
+## TODO: Incremental Watcher
+
+The DAG based incremental rebuilding will require a better file watcher that can whats entire directories and automatically recheck build rules when a new file is created.
+
+```go
+type WatchListener func(path string) error
+
+type Watcher interface {
+    // OnFileChange will register a file change listener
+    OnFileChange(l WatchListener)
+
+    // OnFileAdded will register a file creation listener
+    OnFileAdded(l WatchListener)
+
+    // Watch will register "path"
+    Watch(path string) error
+
+    // Watch will register files matching "pattern" and all directories along the way for new files
+    WatchPattern(pattern string) error
+}
+```

cmd/cabret/serve.go

@@ -5,6 +5,7 @@ import (
 	"log"
 	"net"
 	"net/http"
+	"os"
 	"path/filepath"
 	"strings"
 	"time"
@@ -73,7 +74,7 @@ func serve(c serveConfig) error {
 				if event.Has(fsnotify.Write) {
 					log.Printf(`[Watcher] event: %s`, event)
 
-					if lastRebuild.Add(50 * time.Millisecond).After(time.Now()) {
+					if lastRebuild.Add(200 * time.Millisecond).After(time.Now()) {
 						log.Printf(`[Watcher] too fast, skipping`)
 						continue
 					}
@@ -144,6 +145,11 @@ func serve(c serveConfig) error {
 
 	for _, m := range c.mounts {
 		if strings.HasSuffix(m.route, "/") {
+			s, _ := os.Stat(m.path)
+			if s == nil || !s.IsDir() {
+				continue
+			}
+
 			log.Printf(`[FileServer] mounting directory "%s" on "%s"`, m.path, m.route)
 			r.Handle(m.route+"*", http.StripPrefix(m.route, http.FileServer(http.Dir(m.path))))
 		} else {