Feat: scheduler handle dependencies (basic)

bopytex/scheduler.py

@@ -19,12 +19,19 @@ class Scheduler:
         self._tasks += tasks
 
     def dispatch(self, task):
-        """ Do a task """
+        """Do a task"""
         ans = self.actions[task.action](task.deps, task.args)
         return ans
 
     def __next__(self):
+        undoable = []
+
         task = self._tasks.pop(0)
+        while not all([d in self.done for d in task.deps]):
+            undoable.append(task)
+            task = self._tasks.pop(0)
+
+        self.append(undoable)
         ans = self.dispatch(task)
         self._done.append(ans)
         return ans