Add Changelog and remove flag.

CHANGELOG.md

@@ -3,6 +3,22 @@ Changelog
 
 Development
 -----------
+
+### Build
+- Feature: Support C++20 modules. 
+  This requires:
+  - Using the Ninja or MSVC generator
+  - A recent Clang/GCC/MSVC compiler.
+  - Cmake 3.28 or higher.
+  Usage:
+  ```cpp
+  import ftxui;
+  import ftxui.component;
+  import ftxui.dom;
+  import ftxui.screen;
+  ```
+  Thanks @mikomikotaishi for PR #1015.
+
 ### Component
 - Bugfix: Fix a crash with ResizeableSplit. See #1023.
   - Clamp screen size to terminal size.

CMakeLists.txt

@@ -179,16 +179,4 @@ include(cmake/ftxui_package.cmake)
 
 add_subdirectory(examples)
 add_subdirectory(doc)
-
+add_subdirectory(modules/ftxui)
-option(FTXUI_BUILD_MODULES "Build C++ modules support" OFF)
-
-if(FTXUI_BUILD_MODULES)
-  if(CMAKE_VERSION VERSION_GREATER_EQUAL 3.28)
-    message(STATUS "Building C++ modules (CMake ${CMAKE_VERSION} supports modules)")
-    add_subdirectory(modules/ftxui)
-  else()
-    message(STATUS "Skipping C++ modules (requires CMake 3.28+, found ${CMAKE_VERSION})")
-  endif()
-else()
-  message(STATUS "C++ modules support is disabled. Enable with -DFTXUI_BUILD_MODULES=ON")
-endif()

examples/component/button.cpp

@@ -1,9 +1,30 @@
-#include "ftxui/component/component.hpp"
+#include <memory>  // for shared_ptr, allocator, __shared_ptr_access
-#include "ftxui/component/screen_interactive.hpp"
+ 
+#include "ftxui/component/component.hpp"  // for Renderer, ResizableSplitBottom, ResizableSplitLeft, ResizableSplitRight, ResizableSplitTop
+#include "ftxui/component/component_base.hpp"      // for ComponentBase
+#include "ftxui/component/screen_interactive.hpp"  // for ScreenInteractive
+#include "ftxui/dom/elements.hpp"  // for Element, operator|, text, center, border
+ 
+using namespace ftxui;
+ 
+int main() {
+  auto screen = ScreenInteractive::Fullscreen();
 
-int main(){
+  std::string a = "aa";
-    auto screen = ftxui::ScreenInteractive::Fullscreen();
+
-    auto testComponent = ftxui::Renderer([](){return ftxui::text("test Component");});
+  auto component = Renderer([a] { 
-    screen.Loop(testComponent);
+
-    return 0;
+    std::vector<Element> elements;
+
+    for (auto i = 0; i < 10; ++i) {
+      elements.push_back(window(text(a), paragraph(a)));
+    }
+
+    return vbox(elements);
+  });
+ 
+  auto renderer =
+      Renderer(component, [&] { return component->Render() | border; });
+ 
+  screen.Loop(renderer);
 }

modules/ftxui/CMakeLists.txt

@@ -1,21 +1,67 @@
-file(GLOB_RECURSE FTXUI_MODULES *.cppm)
+# CMake 3.28+ supports the new CMake C++ module system.
-
+if(CMAKE_VERSION VERSION_LESS 3.28)
-add_library(ftxui_modules)
+  return()
-
-cmake_minimum_required(VERSION 3.28)
-
-if(NOT COMMAND configure_cpp_module_target)
-  function(configure_cpp_module_target target)
-    if(CMAKE_VERSION VERSION_GREATER_EQUAL 3.28)
-      target_sources(${target} PUBLIC FILE_SET CXX_MODULES FILES ${FTXUI_MODULES})
-    else()
-      message(WARNING "C++ modules require CMake 3.28+. Using standard compilation.")
-      target_sources(${target} PRIVATE ${FTXUI_MODULES})
-    endif()
-  endfunction()
 endif()
 
-configure_cpp_module_target(ftxui_modules)
+# Not all compilers support the C++ module system yet.
+if (NOT CMAKE_CXX_COMPILER_ID MATCHES "Clang|GNU|MSVC")
+  return()
+endif()
+
+# The list of generators which support scanning sources for C++ modules include:
+# - Ninja
+# - Ninja Multi-Config
+# - Visual Studio 17 2022
+if (NOT (CMAKE_GENERATOR MATCHES "Ninja") AND
+    NOT (CMAKE_GENERATOR MATCHES "Visual Studio" AND
+      CMAKE_GENERATOR_VERSION VERSION_GREATER_EQUAL 17))
+  return()
+endif()
+
+cmake_minimum_required(VERSION 3.28)
+add_library(ftxui_modules)
+
+target_sources(ftxui_modules
+  PUBLIC
+  FILE_SET CXX_MODULES
+  FILES
+  component.cppm
+  component/Animation.cppm
+  component/CapturedMouse.cppm
+  component/Component.cppm
+  component/ComponentBase.cppm
+  component/ComponentOptions.cppm
+  component/Event.cppm
+  component/Loop.cppm
+  component/Mouse.cppm
+  component/Receiver.cppm
+  component/ScreenInteractive.cppm
+  component/Task.cppm
+  dom.cppm
+  dom/Canvas.cppm
+  dom/Deprecated.cppm
+  dom/Direction.cppm
+  dom/Elements.cppm
+  dom/FlexboxConfig.cppm
+  dom/LinearGradient.cppm
+  dom/Node.cppm
+  dom/Requirement.cppm
+  dom/Selection.cppm
+  dom/Table.cppm
+  screen.cppm
+  screen/Box.cppm
+  screen/Color.cppm
+  screen/ColorInfo.cppm
+  screen/Deprecated.cppm
+  screen/Image.cppm
+  screen/Pixel.cppm
+  screen/Screen.cppm
+  screen/String.cppm
+  screen/Terminal.cppm
+  util.cppm
+  util/AutoReset.cppm
+  util/Ref.cppm
+  )
 
 target_link_libraries(ftxui_modules
   PUBLIC
@@ -24,17 +70,14 @@ target_link_libraries(ftxui_modules
     ftxui::component
 )
 
-target_include_directories(ftxui_modules
+target_compile_features(ftxui_modules PUBLIC cxx_std_20)
-  PRIVATE
-    ${ftxui_SOURCE_DIR}/include
-)
 
-set_target_properties(ftxui_modules PROPERTIES 
+#set_target_properties(ftxui_modules PROPERTIES 
-  CXX_STANDARD 23 
+  #CXX_STANDARD 23 
-  CXX_STANDARD_REQUIRED ON
+  #CXX_STANDARD_REQUIRED ON
-  CXX_EXTENSIONS OFF 
+  #CXX_EXTENSIONS OFF 
-  CXX_MODULE_DYNDEP OFF
+  #CXX_MODULE_DYNDEP OFF
-)
+#)
 
 add_library(ftxui::modules ALIAS ftxui_modules)