X-Git-Url: https://git.ayoreis.com/hackapet/Adafruit_Blinka.git/blobdiff_plain/48abd1d4f506138aaae9e514bd063d870f5e1904..a8a160c837be23b17fd159a270edf7c4a6304b88:/python/mcp/__init__.py

diff --git a/python/mcp/__init__.py b/python/mcp/__init__.py
index a8c4a84..0e52a3c 100644
--- a/python/mcp/__init__.py
+++ b/python/mcp/__init__.py
@@ -6,6 +6,18 @@ class Enum(object):
         as seen with Direction.OUTPUT, Pull.UP
     """
 
+    def __repr__(self):
+        """
+        Assumes instance will be found as attribute of own class.
+        Returns dot-subscripted path to instance
+        (assuming absolute import of containing package)
+        """
+        cls = type(self)
+        for key in dir(cls):
+            if getattr(cls, key) is self:
+                return "{}.{}.{}".format(cls.__module__, cls.__qualname__, key)
+        return repr(self)
+
     @classmethod
     def iteritems(cls):
         """
@@ -18,20 +30,25 @@ class Enum(object):
                 yield (key, val)
 
 
-    def __repr__(self):
-        """
-        Assumes instance will be found as attribute of own class.
-        Returns dot-subscripted path to instance
-        (assuming absolute import of containing package)
-        """
-        cls = type(self)
-        for key in dir(cls):
-            if getattr(cls, key) is self:
-                return "{}.{}.{}".format(cls.__module__, cls.__qualname__, key)
-        return repr(self)
+class ContextManaged:
+    def __enter__(self):
+        return self
+
+    def __exit__(self, exc_type, exc_value, traceback):
+        self.deinit()
+
+def Lockable(ContextManaged):
+    _locked = False
+
+    def try_lock(self):
+        if self._locked:
+            return False
+        else:
+            self._locked=True
+            return True
 
-class Pin(Enum):
-    def __init__(self, id):
-        """ id type is likely platform-specific"""
-        self.id = id
-    pass
+    def unlock(self):
+        if self._locked:
+            self._locked = False
+        else:
+            raise ValueError("Not locked")