cmake_minimum_required(VERSION 3.10)
project(TestFindDoxygen VERSION 1.0 LANGUAGES NONE)

find_package(Doxygen REQUIRED)

set(DOXYGEN_OUTPUT_DIRECTORY noFiles)

doxygen_add_docs(docsWithoutFilesWithStamp USE_STAMP_FILE)

if(NOT EXISTS "${PROJECT_BINARY_DIR}/Doxyfile.docsWithoutFilesWithStamp")
  message(FATAL_ERROR "Missing generated file: Doxyfile.docsWithoutFilesWithStamp")
endif()

if(NOT TARGET docsWithoutFilesWithStamp)
  message(FATAL_ERROR "Target docsWithoutFilesWithStamp not created")
endif()

set(DOXYGEN_OUTPUT_DIRECTORY withFiles)

doxygen_add_docs(docsWithFilesWithStamp main.cpp main2.cpp USE_STAMP_FILE)

if(NOT EXISTS "${PROJECT_BINARY_DIR}/Doxyfile.docsWithFilesWithStamp")
  message(FATAL_ERROR "Missing generated file: Doxyfile.docsWithFilesWithStamp")
endif()

if(NOT TARGET docsWithFilesWithStamp)
  message(FATAL_ERROR "Target docsWithFilesWithStamp not created")
endif()

# Confirm that USE_STAMP_FILE and USES_TERMINAL are compatible

set(DOXYGEN_OUTPUT_DIRECTORY noFilesUsesTerminal)

doxygen_add_docs(docsWithoutFilesWithStampUsesTerminal USE_STAMP_FILE USES_TERMINAL)

if(NOT EXISTS "${PROJECT_BINARY_DIR}/Doxyfile.docsWithoutFilesWithStampUsesTerminal")
  message(FATAL_ERROR "Missing generated file: Doxyfile.docsWithoutFilesWithStampUsesTerminal")
endif()

if(NOT TARGET docsWithoutFilesWithStampUsesTerminal)
  message(FATAL_ERROR "Target docsWithoutFilesWithStampUsesTerminal not created")
endif()

set(DOXYGEN_OUTPUT_DIRECTORY withFiles)

doxygen_add_docs(docsWithFilesWithStampUsesTerminal main.cpp main2.cpp USE_STAMP_FILE USES_TERMINAL)

if(NOT EXISTS "${PROJECT_BINARY_DIR}/Doxyfile.docsWithFilesWithStampUsesTerminal")
  message(FATAL_ERROR "Missing generated file: Doxyfile.docsWithFilesWithStampUsesTerminal")
endif()

if(NOT TARGET docsWithFilesWithStampUsesTerminal)
  message(FATAL_ERROR "Target docsWithFilesWithStampUsesTerminal not created")
endif()

# Confirm that doxygen_add_docs() doesn't cause a fatal error if given a
# source file that is generated at build time
file(REMOVE ${CMAKE_CURRENT_BINARY_DIR}/genDox.cpp)

add_custom_command(OUTPUT genDox.cpp
  COMMAND ${CMAKE_COMMAND} -E copy ${CMAKE_CURRENT_SOURCE_DIR}/main2.cpp genDox.cpp
  DEPENDS main2.cpp
)

set(DOXYGEN_OUTPUT_DIRECTORY withGenFiles)

doxygen_add_docs(docsWithGenFilesWithStamp
  main.cpp
  ${CMAKE_CURRENT_BINARY_DIR}/genDox.cpp
  USE_STAMP_FILE
)

add_custom_target(allDocTargets)
add_dependencies(allDocTargets
  docsWithoutFilesWithStamp
  docsWithFilesWithStamp
  docsWithGenFilesWithStamp
  docsWithoutFilesWithStampUsesTerminal
  docsWithFilesWithStampUsesTerminal
)
