Feature/get plugins for hook

changelog/177.feature.rst

@@ -0,0 +1 @@
+Add ``get_hookimpls()`` method to hook callers.

pluggy/hooks.py

@@ -233,6 +233,10 @@ def remove(wrappers):
             if remove(self._nonwrappers) is None:
                 raise ValueError("plugin %r not found" % (plugin,))
 
+    def get_hookimpls(self):
+        # Order is important for _hookexec
+        return self._nonwrappers + self._wrappers
+
     def _add_hookimpl(self, hookimpl):
         """Add an implementation to the callback chain.
         """
@@ -277,7 +281,7 @@ def __call__(self, *args, **kwargs):
                     "can not be found in this hook call".format(tuple(notincall)),
                     stacklevel=2,
                 )
-        return self._hookexec(self, self._nonwrappers + self._wrappers, kwargs)
+        return self._hookexec(self, self.get_hookimpls(), kwargs)
 
     def call_historic(self, result_callback=None, kwargs=None, proc=None):
         """Call the hook with given ``kwargs`` for all registered plugins and
@@ -299,7 +303,7 @@ def call_historic(self, result_callback=None, kwargs=None, proc=None):
 
         self._call_history.append((kwargs or {}, result_callback))
         # historizing hooks don't return results
-        res = self._hookexec(self, self._nonwrappers + self._wrappers, kwargs)
+        res = self._hookexec(self, self.get_hookimpls(), kwargs)
         if result_callback is None:
             return
         # XXX: remember firstresult isn't compat with historic

pluggy/manager.py

@@ -168,7 +168,7 @@ def add_hookspecs(self, module_or_class):
                 else:
                     # plugins registered this hook without knowing the spec
                     hc.set_specification(module_or_class, spec_opts)
-                    for hookfunction in hc._wrappers + hc._nonwrappers:
+                    for hookfunction in hc.get_hookimpls():
                         self._verify_hook(hc, hookfunction)
                 names.append(name)
 
@@ -242,7 +242,7 @@ def check_pending(self):
             if name[0] != "_":
                 hook = getattr(self.hook, name)
                 if not hook.has_spec():
-                    for hookimpl in hook._wrappers + hook._nonwrappers:
+                    for hookimpl in hook.get_hookimpls():
                         if not hookimpl.optionalhook:
                             raise PluginValidationError(
                                 hookimpl.plugin,
@@ -329,7 +329,7 @@ def subset_hook_caller(self, name, remove_plugins):
             hc = _HookCaller(
                 orig.name, orig._hookexec, orig.spec.namespace, orig.spec.opts
             )
-            for hookimpl in orig._wrappers + orig._nonwrappers:
+            for hookimpl in orig.get_hookimpls():
                 plugin = hookimpl.plugin
                 if plugin not in plugins_to_remove:
                     hc._add_hookimpl(hookimpl)

testing/test_pluginmanager.py

@@ -384,6 +384,41 @@ class PluginNo(object):
     assert out == [10]
 
 
+def test_get_hookimpls(pm):
+    class Hooks(object):
+        @hookspec
+        def he_method1(self, arg):
+            pass
+
+    pm.add_hookspecs(Hooks)
+    assert pm.hook.he_method1.get_hookimpls() == []
+
+    class Plugin1(object):
+        @hookimpl
+        def he_method1(self, arg):
+            pass
+
+    class Plugin2(object):
+        @hookimpl
+        def he_method1(self, arg):
+            pass
+
+    class PluginNo(object):
+        pass
+
+    plugin1, plugin2, plugin3 = Plugin1(), Plugin2(), PluginNo()
+    pm.register(plugin1)
+    pm.register(plugin2)
+    pm.register(plugin3)
+
+    hookimpls = pm.hook.he_method1.get_hookimpls()
+    hook_plugins = [item.plugin for item in hookimpls]
+
+    assert plugin1 in hook_plugins
+    assert plugin2 in hook_plugins
+    assert plugin3 not in hook_plugins
+
+
 def test_add_hookspecs_nohooks(pm):
     with pytest.raises(ValueError):
         pm.add_hookspecs(10)