CMake: Install 'direct'.

direct/CMakeLists.txt

@@ -14,3 +14,25 @@ add_subdirectory(src/interval)
 add_subdirectory(src/showbase)
 
 add_python_module(direct p3dcparser p3deadrec p3distributed p3interval p3showbase)
+
+# Installation:
+if(HAVE_PYTHON)
+  set(DIRECT_INSTALL_DIRECTORIES
+      actor cluster controls directbase directdevices directnotify directscripts
+      directtools directutil distributed extensions extensions_native ffi filter
+      fsm gui http interval leveleditor motiontrail p3d particles physics pyinst
+      showbase showutil stdpy task test tkpanels tkwidgets wxwidgets)
+
+  foreach(dir ${DIRECT_INSTALL_DIRECTORIES})
+    install(
+      DIRECTORY "src/${dir}"
+      DESTINATION "${PYTHON_LIB_INSTALL_DIR}/direct"
+      PATTERN "*.py")
+  endforeach()
+
+  # We also need an __init__.py file, which we have to generate:
+  file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/__init__.py" "")
+  install(
+    FILES "${CMAKE_CURRENT_BINARY_DIR}/__init__.py"
+    DESTINATION "${PYTHON_LIB_INSTALL_DIR}/direct")
+endif()