Extract example code from docs (#291)

Author: mingxwa

CMakeLists.txt

@@ -26,5 +26,5 @@ include(CTest)
 if (BUILD_TESTING)
   add_subdirectory(tests)
   add_subdirectory(benchmarks)
-  add_subdirectory(samples)
+  add_subdirectory(docs)
 endif()

docs/CMakeLists.txt

@@ -0,0 +1,28 @@
+project(msft_proxy_docs)
+
+find_package(Python3 REQUIRED COMPONENTS Interpreter)
+
+file(GLOB_RECURSE DOC_FILES "*.md")
+set(EXTRACTION_SCRIPT ${CMAKE_SOURCE_DIR}/tools/extract_example_code_from_docs.py)
+set(EXAMPLES_DIR ${CMAKE_BINARY_DIR}/examples_from_docs)
+file(MAKE_DIRECTORY "${EXAMPLES_DIR}")
+execute_process(
+  COMMAND ${Python3_EXECUTABLE} ${EXTRACTION_SCRIPT} ${CMAKE_CURRENT_SOURCE_DIR} ${EXAMPLES_DIR}
+  WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
+  COMMAND_ERROR_IS_FATAL ANY
+)
+
+file(GLOB EXAMPLE_SOURCES "${EXAMPLES_DIR}/*.cpp")
+set_source_files_properties(${EXAMPLE_SOURCES} PROPERTIES GENERATED TRUE)
+foreach(SOURCE ${EXAMPLE_SOURCES})
+  get_filename_component(EXECUTABLE_NAME ${SOURCE} NAME_WE)
+  add_executable(${EXECUTABLE_NAME} ${SOURCE})
+  target_link_libraries(${EXECUTABLE_NAME} PRIVATE msft_proxy)
+  if (MSVC)
+    target_compile_options(${EXECUTABLE_NAME} PRIVATE /W4)
+  elseif(CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
+    target_compile_options(${EXECUTABLE_NAME} PRIVATE -Wall -Wextra -Wpedantic -Wno-c++2b-extensions)
+  else()
+    target_compile_options(${EXECUTABLE_NAME} PRIVATE -Wall -Wextra -Wpedantic)
+  endif()
+endforeach()