ModuleManager reloads only if file's mtime changed

modman/main.py

@@ -13,24 +13,40 @@ class ModuleManager:
     def __init__(self, folder):
         self.folder = Path(folder)
         self.modules = {}
+        self.mtimes = {}
         self.update()
 
+
     def update(self):
         for fn in self.fnames:
-            print(fn, fn.stat().st_mtime)
             name = fn.stem
+            mtime = fn.stat().st_mtime
+            print(fn, name, mtime)
+
+            if name in self.mtimes:
+                if self.mtimes[name] == mtime:
+                    print(f"{name} unchanged... will not reload")
+                    continue
+                else:
+                    print(f"{name} changed... reloading")
+
+            self.mtimes[name] = mtime
+
             try:
                 mod = load_module(name, fn)
             except Exception as e:
                 print(f"loading {name} raised", printable_exception(e))
                 continue
+
             try:
                 func = mod.run
             except AttributeError:
                 print(f"missing run function in {name}")
                 continue
+
             self.modules[name] = func
 
+
     @property
     def fnames(self):
         fns = self.folder.glob("*.py")
@@ -43,6 +59,7 @@ modman = ModuleManager(folder)
 mods = modman.modules
 
 while True:
+    modman.update()
     with ThreadPoolExecutor() as ex:
         for f in mods.values():
             fut = ex.submit(f)