run command on new file

scripts/cmd_on_new_ckpt.py

@@ -0,0 +1,32 @@
+import os
+import subprocess
+import time
+import fire
+
+
+class Checker(object):
+    def __init__(self, filename, interval=60):
+        self._cached_stamp = 0
+        self.filename = filename
+        self.interval = interval
+    
+    def check(self, cmd):
+        while True:
+            stamp = os.stat(self.filename).st_mtime
+            if stamp != self._cached_stamp:
+                self._cached_stamp = stamp
+                print(f"{self.__class__.__name__}: Detected a new file at {self.filename}, running evaluation commands on it.")
+                subprocess.run(cmd, shell=True)
+            else:
+                time.sleep(self.interval)
+
+
+def run(filename, cmd):
+    checker = Checker(filename, interval=60)
+    checker.check(cmd)
+
+
+if __name__ == "__main__":
+    fire.Fire(run)
+                
+