done

lib/python3.11/site-packages/dash/_watch.py

@@ -0,0 +1,36 @@
+import collections
+import os
+import re
+import time
+
+
+def watch(folders, on_change, pattern=None, sleep_time=0.1):
+    pattern = re.compile(pattern) if pattern else None
+    watched = collections.defaultdict(lambda: -1.0)
+
+    def walk():
+        walked = []
+        for folder in folders:
+            for current, _, files in os.walk(folder):
+                for f in files:
+                    if pattern and not pattern.search(f):
+                        continue
+                    path = os.path.join(current, f)
+
+                    info = os.stat(path)
+                    new_time = info.st_mtime
+
+                    if new_time > watched[path] > 0:
+                        on_change(path, new_time, False)
+
+                    watched[path] = new_time
+                    walked.append(path)
+
+        # Look for deleted files
+        for w in [x for x in watched.keys() if x not in walked]:
+            del watched[w]
+            on_change(w, -1, True)
+
+    while True:
+        walk()
+        time.sleep(sleep_time)