3 files changed, 58 insertions, 6 deletions
diff --git a/mesonbuild/modules/__init__.py b/mesonbuild/modules/__init__.py
index 2b53de5..19de1bd 100644
--- a/mesonbuild/modules/__init__.py
+++ b/mesonbuild/modules/__init__.py
@@ -16,10 +16,11 @@
 # are UI-related.
 
 import os
+import typing as T
 
 from .. import build
 from ..mesonlib import relpath, HoldableObject
-import typing as T
+from ..interpreterbase.decorators import noKwargs, noPosargs
 
 if T.TYPE_CHECKING:
     from ..interpreter import Interpreter
@@ -91,18 +92,21 @@ class ModuleState:
                      wanted: T.Optional[str] = None) -> 'ExternalProgram':
         return self._interpreter.find_program_impl(prog, required=required, version_func=version_func, wanted=wanted)
 
+
 class ModuleObject(HoldableObject):
     """Base class for all objects returned by modules
     """
     def __init__(self) -> None:
         self.methods: T.Dict[
             str,
-            T.Callable[[ModuleState, T.List[TYPE_var], TYPE_kwargs], T.Union[ModuleReturnValue, TYPE_var]]
+            T.Callable[[ModuleState, T.List['TYPE_var'], 'TYPE_kwargs'], T.Union[ModuleReturnValue, 'TYPE_var']]
         ] = {}
 
+
 class MutableModuleObject(ModuleObject):
     pass
 
+
 # FIXME: Port all modules to stop using self.interpreter and use API on
 # ModuleState instead. Modules should stop using this class and instead use
 # ModuleObject base class.
@@ -110,6 +114,54 @@ class ExtensionModule(ModuleObject):
     def __init__(self, interpreter: 'Interpreter') -> None:
         super().__init__()
         self.interpreter = interpreter
+        self.methods.update({
+            'found': self.found_method,
+        })
+
+    @noPosargs
+    @noKwargs
+    def found_method(self, state: 'ModuleState', args: T.List['TYPE_var'], kwargs: 'TYPE_kwargs') -> bool:
+        return self.found()
+
+    @staticmethod
+    def found() -> bool:
+        return True
+
+
+class NewExtensionModule(ModuleObject):
+
+    """Class for modern modules
+
+    provides the found method.
+    """
+
+    def __init__(self) -> None:
+        super().__init__()
+        self.methods.update({
+            'found': self.found_method,
+        })
+
+    @noPosargs
+    @noKwargs
+    def found_method(self, state: 'ModuleState', args: T.List['TYPE_var'], kwargs: 'TYPE_kwargs') -> bool:
+        return self.found()
+
+    @staticmethod
+    def found() -> bool:
+        return True
+
+
+class NotFoundExtensionModule(NewExtensionModule):
+
+    """Class for modern modules
+
+    provides the found method.
+    """
+
+    @staticmethod
+    def found() -> bool:
+        return False
+
 
 def is_module_library(fname):
     '''
diff --git a/mesonbuild/modules/unstable_cuda.py b/mesonbuild/modules/unstable_cuda.py
index 328b90b..9e8aa63 100644
--- a/mesonbuild/modules/unstable_cuda.py
+++ b/mesonbuild/modules/unstable_cuda.py
@@ -18,14 +18,14 @@ import re
 from ..mesonlib import version_compare
 from ..compilers import CudaCompiler, Compiler
 
-from . import ModuleObject
+from . import NewExtensionModule
 
 from ..interpreterbase import (
     flatten, permittedKwargs, noKwargs,
     InvalidArguments, FeatureNew
 )
 
-class CudaModule(ModuleObject):
+class CudaModule(NewExtensionModule):
 
     @FeatureNew('CUDA module', '0.50.0')
     def __init__(self, *args, **kwargs):
diff --git a/mesonbuild/modules/unstable_external_project.py b/mesonbuild/modules/unstable_external_project.py
index 4f8ac56..f866e75 100644
--- a/mesonbuild/modules/unstable_external_project.py
+++ b/mesonbuild/modules/unstable_external_project.py
@@ -16,7 +16,7 @@ import os, subprocess, shlex
 from pathlib import Path
 import typing as T
 
-from . import ExtensionModule, ModuleReturnValue, ModuleState, ModuleObject
+from . import ExtensionModule, ModuleReturnValue, ModuleState, NewExtensionModule
 from .. import mlog, build
 from ..mesonlib import (MesonException, Popen_safe, MachineChoice,
                        get_variable_regex, do_replacement, extract_as_list)
@@ -26,7 +26,7 @@ from ..compilers.compilers import CFLAGS_MAPPING, CEXE_MAPPING
 from ..dependencies import InternalDependency, PkgConfigDependency
 from ..mesonlib import OptionKey
 
-class ExternalProject(ModuleObject):
+class ExternalProject(NewExtensionModule):
     def __init__(self,
                  state: ModuleState,
                  configure_command: str,