# Main CMakeLists.txt to build the FLTK project using CMake (www.cmake.org)
# Written by Andy Cedilnik and Julien Jomier

PROJECT(FLTK)
CMAKE_MINIMUM_REQUIRED(VERSION 2.0)

# The FLTK version
SET(FLTK_VERSION_MAJOR "1")
SET(FLTK_VERSION_MINOR "3")
SET(FLTK_VERSION_PATCH "0")
SET(FLTK_VERSION "${FLTK_VERSION_MAJOR}.${FLTK_VERSION_MINOR}")
SET(FLTK_VERSION_FULL "${FLTK_VERSION}.${FLTK_VERSION_PATCH}")

SET(FLTK_LIBRARIES "fltk_images;fltk;fltk_gl;fltk_forms")

# Executables and libraries should just go to bin
SET(EXECUTABLE_OUTPUT_PATH "${FLTK_BINARY_DIR}/bin" CACHE INTERNAL 
  "Where to put the executables for FLTK"
  )
SET(LIBRARY_OUTPUT_PATH "${FLTK_BINARY_DIR}/bin" CACHE INTERNAL 
  "Where to put the libraries for FLTK"
  )

# Allow building shared libraries
OPTION(BUILD_SHARED_LIBS "Build FLTK as a shared library" OFF)

# Search for modules in the FLTK source dir first
SET(CMAKE_MODULE_PATH "${FLTK_SOURCE_DIR}/CMake")

#-----------------------------------------------------------------------------
# Test for some required system information.
FIND_PACKAGE(Threads)
SET (CMAKE_USE_PTHREADS 
  "${CMAKE_USE_PTHREADS_INIT}" CACHE BOOL "Use the pthreads library.")

# We need ansi c-flags, especially on HP
SET(CMAKE_C_FLAGS "${CMAKE_ANSI_CFLAGS} ${CMAKE_C_FLAGS}")
SET(CMAKE_REQUIRED_FLAGS ${CMAKE_ANSI_CFLAGS})
 
IF(WIN32)
  IF(NOT CYGWIN)
    IF(BORLAND)
      SET( FLTK_PLATFORM_DEPENDENT_LIBS import32 )
    ELSE(BORLAND)
      SET( FLTK_PLATFORM_DEPENDENT_LIBS comctl32 )
    ENDIF(BORLAND)
  ENDIF(NOT CYGWIN)
ENDIF(WIN32)

SET(FLTK_X11 1)
SET(FLTK_APPLE 0)
IF(APPLE)
  OPTION(FLTK_APPLE_X11 "Use X11 on Mac instead of Carbon" OFF)
  MARK_AS_ADVANCED(FLTK_APPLE_X11)
  IF(NOT FLTK_APPLE_X11)
    SET(FLTK_APPLE 1)
    SET(FLTK_X11 0)
    OPTION(FLTK_QUARTZ "Use Quartz instead of Quickdraw" OFF)
  ENDIF(NOT FLTK_APPLE_X11)
ENDIF(APPLE)

IF(UNIX)
  FIND_PACKAGE(X11)
  SET( FLTK_PLATFORM_DEPENDENT_LIBS ${X11_LIBRARIES} -lm)
ENDIF(UNIX)

IF(APPLE AND NOT FLTK_APPLE_X11)
  SET( FLTK_PLATFORM_DEPENDENT_LIBS
    "-framework Carbon -framework Cocoa -framework ApplicationServices -lz")
ENDIF(APPLE AND NOT FLTK_APPLE_X11)

IF(CYGWIN)
  ADD_DEFINITIONS(-DWIN32)  
  SET( FLTK_PLATFORM_DEPENDENT_LIBS ole32 uuid comctl32 supc++ -lm -lgdi32)
ENDIF(CYGWIN)

IF(MINGW)
  ADD_DEFINITIONS(-DWIN32)
  SET( FLTK_PLATFORM_DEPENDENT_LIBS ole32 uuid wsock32 gdi32 comdlg32)
ENDIF(MINGW)

INCLUDE(CheckIncludeFiles)
# Check if header file exists and add it to the list.
MACRO(CHECK_INCLUDE_FILE_CONCAT FILE VARIABLE)
  CHECK_INCLUDE_FILES("${PROJECT_INCLUDES};${FILE}" ${VARIABLE})
  IF(${VARIABLE})
    SET(PROJECT_INCLUDES ${PROJECT_INCLUDES} ${FILE})
  ENDIF(${VARIABLE})
ENDMACRO(CHECK_INCLUDE_FILE_CONCAT)
CHECK_INCLUDE_FILE_CONCAT("GL/glu.h"       HAVE_GL_GLU_H)
CHECK_INCLUDE_FILE_CONCAT("OpenGL/glu.h"   HAVE_OPENGL_GLU_H)
CHECK_INCLUDE_FILE_CONCAT("dirent.h"       HAVE_DIRENT_H)
CHECK_INCLUDE_FILE_CONCAT("stdio.h"        HAVE_STDIO_H)
CHECK_INCLUDE_FILE_CONCAT("strings.h"      HAVE_STRINGS_H)
CHECK_INCLUDE_FILE_CONCAT("sys/dir.h"      HAVE_SYS_DIR_H)
CHECK_INCLUDE_FILE_CONCAT("sys/ndir.h"     HAVE_SYS_NDIR_H)
CHECK_INCLUDE_FILE_CONCAT("sys/select.h"   HAVE_SYS_SELECT_H)
CHECK_INCLUDE_FILE_CONCAT("sys/stdtypes.h" HAVE_SYS_STDTYPES_H)
CHECK_INCLUDE_FILE("pthread.h"      CMAKE_HAVE_PTHREAD_H)

FIND_PACKAGE(ZLIB)
FIND_PACKAGE(PNG)
FIND_PACKAGE(JPEG)

INCLUDE(CheckSymbolExists)
INCLUDE(CheckFunctionWithHeaderExists)

CHECK_FUNCTIONWITHHEADER_EXISTS("int strcasecmp()"  "${PROJECT_INCLUDES}" HAVE_STRCASECMP)

CHECK_SYMBOL_EXISTS(strlcat       "${PROJECT_INCLUDES}" HAVE_STRLCAT)
CHECK_SYMBOL_EXISTS(strlcpy       "${PROJECT_INCLUDES}" HAVE_STRLCPY)
CHECK_SYMBOL_EXISTS(vsnprintf     "${PROJECT_INCLUDES}" HAVE_VSNPRINTF)
CHECK_SYMBOL_EXISTS(snprintf      "${PROJECT_INCLUDES}" HAVE_SNPRINTF)
CHECK_SYMBOL_EXISTS(scandir       "${PROJECT_INCLUDES}" HAVE_SCANDIR)

INCLUDE(CheckTypeSize)

CHECK_TYPE_SIZE(short SIZEOF_SHORT)
CHECK_TYPE_SIZE(int   SIZEOF_INT)
CHECK_TYPE_SIZE(long  SIZEOF_LONG)

IF(${SIZEOF_SHORT} MATCHES "^2$")
  SET(U16 "unsigned short")
ENDIF(${SIZEOF_SHORT} MATCHES "^2$")

IF(${SIZEOF_INT} MATCHES "^4$")
  SET(U32 "unsigned")
ELSE(${SIZEOF_INT} MATCHES "^4$")
  IF(${SIZEOF_LONG} MATCHES "^4$")
    SET(U32 "unsigned long")
  ENDIF(${SIZEOF_LONG} MATCHES "^4$")
ENDIF(${SIZEOF_INT} MATCHES "^4$")

IF(${SIZEOF_INT} MATCHES "^8$")
  SET(U64 "unsigned")
ELSE(${SIZEOF_INT} MATCHES "^8$")
  IF(${SIZEOF_LONG} MATCHES "^8$")
    SET(U64 "unsigned long")
  ENDIF(${SIZEOF_LONG} MATCHES "^8$")
ENDIF(${SIZEOF_INT} MATCHES "^8$")

# Set an option to build FLTK with OpenGL support
SET(HAVE_GL 0)
OPTION(USE_OPENGL "OpenGL Support" ON)
IF(USE_OPENGL)
  FIND_PACKAGE(OpenGL)
  IF(OPENGL_FOUND)
    SET(HAVE_GL 1)
    INCLUDE_DIRECTORIES(${OPENGL_INCLUDE_DIR})
  ENDIF(OPENGL_FOUND)
ENDIF(USE_OPENGL)

#
# Perform the FLTK specific test with status output
#
MACRO(PERFORM_CMAKE_TEST FILE TEST)
  IF("${TEST}" MATCHES "^${TEST}$")
    # Perform test
    SET(MACRO_CHECK_FUNCTION_DEFINITIONS 
      "-D${TEST} ${CMAKE_REQUIRED_FLAGS}")
    IF(CMAKE_REQUIRED_LIBRARIES)
      SET(TEST_ADD_LIBRARIES
        "-DLINK_LIBRARIES:STRING=${CMAKE_REQUIRED_LIBRARIES}")
    ENDIF(CMAKE_REQUIRED_LIBRARIES)
    MESSAGE(STATUS "Performing Test ${TEST}")

    TRY_COMPILE(${TEST}
      ${CMAKE_BINARY_DIR}
      ${CMAKE_CURRENT_SOURCE_DIR}/${FILE}
      CMAKE_FLAGS -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_FUNCTION_DEFINITIONS}
      -DLINK_LIBRARIES:STRING=${CMAKE_TEST_SPECIAL_LIBRARIES}
      "${TEST_ADD_LIBRARIES}"
      OUTPUT_VARIABLE OUTPUT)
    IF(${TEST})
      SET(${TEST} 1 CACHE INTERNAL "CMake test ${FUNCTION}")
      MESSAGE(STATUS "Performing Test ${TEST} - Success")
    ELSE(${TEST})
      MESSAGE(STATUS "Performing Test ${TEST} - Failed")
      SET(${TEST} 0 CACHE INTERNAL "Test ${FUNCTION}")
      WRITE_FILE(${CMAKE_BINARY_DIR}/CMakeError.log 
        "Performing Test ${TEST} failed with the following output:\n"
        "${OUTPUT}\n" APPEND)
    ENDIF(${TEST})
  ENDIF("${TEST}" MATCHES "^${TEST}$")
ENDMACRO(PERFORM_CMAKE_TEST FILE TEST)

# Set an option to build the zlib library or not
OPTION(FLTK_USE_SYSTEM_ZLIB "Use's system zlib" OFF)
IF(FLTK_USE_SYSTEM_ZLIB)
  IF(ZLIB_FOUND)
    SET(CMAKE_TEST_SPECIAL_LIBRARIES ${ZLIB_LIBRARIES})
    SET(FLTK_ZLIB_LIBRARIES ${ZLIB_LIBRARIES})
    PERFORM_CMAKE_TEST(CMake/PlatformTests.cxx HAVE_LIBZ)
  ENDIF(ZLIB_FOUND)
  # We build the fltk zlib
ELSE(FLTK_USE_SYSTEM_ZLIB)
  MARK_AS_ADVANCED(ZLIB_INCLUDE_DIR)
  MARK_AS_ADVANCED(ZLIB_LIBRARY)
  SUBDIRS(zlib)
  SET(HAVE_LIBZ 1)
  SET(FLTK_ZLIB_LIBRARIES fltk_zlib)
  SET(FLTK_LIBRARIES "${FLTK_LIBRARIES};fltk_zlib")
  INCLUDE_DIRECTORIES("${CMAKE_CURRENT_SOURCE_DIR}/zlib")
ENDIF(FLTK_USE_SYSTEM_ZLIB)

# Set an option to build the jpeg library or not
OPTION(FLTK_USE_SYSTEM_JPEG "Use's system jpeg" OFF)
IF(FLTK_USE_SYSTEM_JPEG)
  IF(JPEG_FOUND)
    SET(CMAKE_TEST_SPECIAL_LIBRARIES ${JPEG_LIBRARIES})
    SET(FLTK_JPEG_LIBRARIES ${JPEG_LIBRARIES})
    PERFORM_CMAKE_TEST(CMake/PlatformTests.cxx HAVE_LIBJPEG)
  ENDIF(JPEG_FOUND)
  # We build the fltk png
ELSE(FLTK_USE_SYSTEM_JPEG)
  MARK_AS_ADVANCED(JPEG_INCLUDE_DIR)
  MARK_AS_ADVANCED(JPEG_LIBRARY)
  SUBDIRS(jpeg)
  SET(HAVE_LIBJPEG 1)
  SET(FLTK_JPEG_LIBRARIES fltk_jpeg)
  SET(FLTK_LIBRARIES "${FLTK_LIBRARIES};fltk_jpeg")
  INCLUDE_DIRECTORIES("${CMAKE_CURRENT_SOURCE_DIR}/jpeg")
ENDIF(FLTK_USE_SYSTEM_JPEG)

# Set an option to build the png library or not
OPTION(FLTK_USE_SYSTEM_PNG "Use's system png" OFF)
IF(FLTK_USE_SYSTEM_PNG)
  IF(PNG_FOUND)
    SET(CMAKE_TEST_SPECIAL_LIBRARIES ${PNG_LIBRARIES})
    SET(FLTK_PNG_LIBRARIES ${PNG_LIBRARIES})
    PERFORM_CMAKE_TEST(CMake/PlatformTests.cxx HAVE_LIBPNG)
    PERFORM_CMAKE_TEST(CMake/PlatformTests.cxx HAVE_PNG_GET_VALID)
    PERFORM_CMAKE_TEST(CMake/PlatformTests.cxx HAVE_PNG_SET_TRNS_TO_ALPHA)
    SET(HAVE_PNG_H 1)
  ENDIF(PNG_FOUND)
  # We build the fltk png
ELSE(FLTK_USE_SYSTEM_PNG)
  MARK_AS_ADVANCED(PNG_INCLUDE_DIR)
  MARK_AS_ADVANCED(PNG_LIBRARY)
  SUBDIRS(png)
  SET(HAVE_LIBPNG 1)
  SET(HAVE_PNG_H 1)
  SET(FLTK_PNG_LIBRARIES fltk_png)
  SET(FLTK_LIBRARIES "${FLTK_LIBRARIES};fltk_png")
  INCLUDE_DIRECTORIES("${CMAKE_CURRENT_SOURCE_DIR}/png")
ENDIF(FLTK_USE_SYSTEM_PNG)

SET(FLTK_DATADIR "${CMAKE_INSTALL_PREFIX}/share/FLTK")
SET(FLTK_DOCDIR  "${CMAKE_INSTALL_PREFIX}/share/doc/FLTK")

# Write out configuration header file
CONFIGURE_FILE(${FLTK_SOURCE_DIR}/configh.cmake.in
  ${FLTK_BINARY_DIR}/config.h)

# On unix create symlinks for backward compatibility
SET(FLTK_CREATE_SYMLINKS 1)
IF(WIN32)
  IF(NOT UNIX)
    SET(FLTK_CREATE_SYMLINKS 0)
  ENDIF(NOT UNIX)
ENDIF(WIN32)

MACRO(SAFE_CREATE_SYMLINK SOURCE DESTINATION)
  IF(EXISTS "${DESTINATION}")
  ELSE(EXISTS "${DESTINATION}")
    MESSAGE(STATUS "Create symlink from: \"${SOURCE}\" to \"${DESTINATION}\"")
    # The quoting here does seems unnatural, but this is to prevent bug in CMake
    EXEC_PROGRAM(ln ARGS 
      "-s \"${SOURCE}\" \"${DESTINATION}\"" OUTPUT_VARIABLE ln_output
      RETURN_VALUE ln_retval)
    IF("${ln_retval}" GREATER 0)
      MESSAGE(FATAL_ERROR "Problem creatin symlink from \"${SOURCE}\" to \"${DESTINATION}\":\n${ln_output}")
    ENDIF("${ln_retval}" GREATER 0)
  ENDIF(EXISTS "${DESTINATION}")
ENDMACRO(SAFE_CREATE_SYMLINK SOURCE DESTINATION)

# If this is out-of-source build, then copy FL directory
FILE(GLOB FLTK_HEADER_FILES "${FLTK_SOURCE_DIR}/FL/*.[hHr]")
FOREACH(file ${FLTK_HEADER_FILES})
  GET_FILENAME_COMPONENT(ext "${file}" EXT)
  GET_FILENAME_COMPONENT(namewe "${file}" NAME_WE)
  GET_FILENAME_COMPONENT(name "${file}" NAME)
  STRING(COMPARE EQUAL "${ext}" ".h" lower_case_h)
  STRING(COMPARE EQUAL "${ext}" ".H" upper_case_h)
  IF(lower_case_h OR upper_case_h)
    SET(outfile_h "${FLTK_BINARY_DIR}/FL/${namewe}.h")
    SET(outfile_H "${FLTK_BINARY_DIR}/FL/${namewe}.H")
    CONFIGURE_FILE("${file}" "${outfile_H}" COPYONLY IMMEDIATE)
    CONFIGURE_FILE("${file}" "${outfile_h}" COPYONLY IMMEDIATE)
#    IF(FLTK_CREATE_SYMLINKS)
#      SAFE_CREATE_SYMLINK("${outfile_H}" "${outfile_h}")
#    ENDIF(FLTK_CREATE_SYMLINKS)
  ELSE(lower_case_h OR upper_case_h)
    STRING(COMPARE EQUAL "${ext}" ".r" mac_resource_file)
    IF(mac_resource_file)
      SET(outfile "${FLTK_BINARY_DIR}/FL/${name}")
      CONFIGURE_FILE("${file}" "${outfile}" COPYONLY IMMEDIATE)
    ENDIF(mac_resource_file)
  ENDIF(lower_case_h OR upper_case_h)
ENDFOREACH(file)

IF(FLTK_CREATE_SYMLINKS)
  SAFE_CREATE_SYMLINK(
    "${FLTK_BINARY_DIR}/FL"
    "${FLTK_BINARY_DIR}/Fl")

  SAFE_CREATE_SYMLINK(
    "${FLTK_BINARY_DIR}/FL/gl.H"
    "${FLTK_BINARY_DIR}/FL/gl.h")

  # Create the symlinks
  FILE(READ ${FLTK_SOURCE_DIR}/fltk.list.in SYMLINKSFILE)
  STRING(REGEX MATCHALL "(l 0000 root sys .includedir/)([^(\n)])+"
  SYMLINKS ${SYMLINKSFILE})
  FOREACH(var ${SYMLINKS} )
    IF("${var}" MATCHES ".H")
      STRING(REGEX MATCH "(/F)([^(\n)])+" tmp ${var})
      STRING(REGEX MATCH "(/F)([^( )])+" in ${tmp})
      STRING(REGEX MATCH "( )([^(\n)])+" out ${tmp}) 
      STRING(REGEX REPLACE "( )" "" out ${out})
      SAFE_CREATE_SYMLINK("${FLTK_BINARY_DIR}/FL/${out}" "${FLTK_BINARY_DIR}/${in}")
    ENDIF("${var}" MATCHES ".H")
  ENDFOREACH(var)
ENDIF(FLTK_CREATE_SYMLINKS)

# Set the fluid executable path
UTILITY_SOURCE(FLUID_COMMAND fluid fluid fluid.cxx)
SET(FLUID_COMMAND "${FLUID_COMMAND}" CACHE INTERNAL "" FORCE)

# Include header files in fltk binary tree
INCLUDE_DIRECTORIES(${FLTK_BINARY_DIR})

# Do the build of fltk libraries and fluid
SUBDIRS(src)
SUBDIRS(fluid)


# Set an option to build the examples and testing
OPTION(BUILD_EXAMPLES "Build the tests" ON)
IF(BUILD_EXAMPLES)
  SUBDIRS(test)
ENDIF(BUILD_EXAMPLES)

OPTION(BUILD_TESTING "Build testing of FLTK" ON)
IF(BUILD_TESTING)
  ENABLE_TESTING()
  INCLUDE(Dart)
ENDIF(BUILD_TESTING)

#-----------------------------------------------------------------------------
# Help outside projects build FLTK projects.
INCLUDE(CMakeExportBuildSettings)
EXPORT_LIBRARY_DEPENDENCIES(${FLTK_BINARY_DIR}/FLTKLibraryDepends.cmake)
CMAKE_EXPORT_BUILD_SETTINGS(${FLTK_BINARY_DIR}/FLTKBuildSettings.cmake)
SET(FL_MAJOR_VERSION "${FLTK_VERSION_MAJOR}")
SET(FL_MINOR_VERSION "${FLTK_VERSION_MINOR}")
SET(FL_PATCH_VERSION "${FLTK_VERSION_PATCH}")

SET(CFLAGS "${CMAKE_C_FLAGS}")
SET(CXXFLAGS "${CMAKE_CXX_FLAGS}")
SET(CC "${CMAKE_C_COMPILER}")
SET(CXX "${CMAKE_CXX_COMPILER}")

# For build tree usage
SET(FLTK_FLUID_COMMAND "${FLUID_COMMAND}")
SET(FLTK_LIBRARY_DEPENDS_FILE ${FLTK_BINARY_DIR}/FLTKLibraryDepends.cmake)
SET(FLTK_EXECUTABLE_DIRS ${EXECUTABLE_OUTPUT_PATH})
SET(FLTK_LIBRARY_DIRS ${LIBRARY_OUTPUT_PATH})
SET(FLTK_USE_FILE ${FLTK_SOURCE_DIR}/CMake/FLTKUse.cmake)
SET(FLTK_INCLUDE_DIRS "${FLTK_BINARY_DIR}/")
SET(FLTK_BUILD_SETTINGS_FILE ${FLTK_BINARY_DIR}/FLTKBuildSettings.cmake)
SET(prefix "${FLTK_BINARY_DIR}")
SET(exec_prefix "${prefix}")
SET(exec_prefix_set "no")
SET(bindir "${prefix}/bin")
SET(includedir "${prefix}")
SET(libdir "${prefix}/bin")
SET(srcdir "${FLTK_SOURCE_DIR}")

CONFIGURE_FILE("${FLTK_SOURCE_DIR}/CMake/FLTKConfig.cmake.in"
  "${FLTK_BINARY_DIR}/FLTKConfig.cmake" @ONLY IMMEDIATE)
CONFIGURE_FILE("${FLTK_SOURCE_DIR}/fltk-config.in"
  "${FLTK_BINARY_DIR}/fltk-config" @ONLY IMMEDIATE)

# For installed tree usage
SET(FLTK_FLUID_COMMAND "${CMAKE_INSTALL_PREFIX}/bin/fluid")
SET(FLTK_LIBRARY_DEPENDS_FILE ${CMAKE_INSTALL_PREFIX}/lib/FLTK-${FLTK_VERSION}/FLTKLibraryDepends.cmake)
SET(FLTK_EXECUTABLE_DIRS "${CMAKE_INSTALL_PREFIX}/bin")
SET(FLTK_LIBRARY_DIRS "${CMAKE_INSTALL_PREFIX}/lib")
SET(FLTK_USE_FILE "${CMAKE_INSTALL_PREFIX}/lib/FLTK-${FLTK_VERSION}/FLTKUse.cmake")
SET(FLTK_INCLUDE_DIRS "${CMAKE_INSTALL_PREFIX}/")
SET(FLTK_BUILD_SETTINGS_FILE ${CMAKE_INSTALL_PREFIX}/lib/FLTK-${FLTK_VERSION}/FLTKBuildSettings.cmake)
SET(prefix "${CMAKE_INSTALL_PREFIX}")
SET(exec_prefix "${prefix}")
SET(exec_prefix_set "no")
SET(bindir "${prefix}/bin")
SET(includedir "${prefix}")
SET(libdir "${prefix}/lib")
SET(srcdir ".")

CONFIGURE_FILE("${FLTK_SOURCE_DIR}/CMake/FLTKConfig.cmake.in"
  "${FLTK_BINARY_DIR}/CMake/FLTKConfig.cmake" @ONLY IMMEDIATE)
CONFIGURE_FILE("${FLTK_SOURCE_DIR}/fltk-config.in"
  "${FLTK_BINARY_DIR}/CMake/fltk-config" @ONLY IMMEDIATE)

INSTALL_FILES(/include/FL FILES ${FLTK_HEADER_FILES})
INSTALL_FILES(/lib/FLTK-${FLTK_VERSION} FILES "${FLTK_SOURCE_DIR}/CMake/FLTKUse.cmake")
INSTALL_FILES(/lib/FLTK-${FLTK_VERSION} FILES "${FLTK_BINARY_DIR}/FLTKBuildSettings.cmake")
INSTALL_FILES(/lib/FLTK-${FLTK_VERSION} FILES "${FLTK_BINARY_DIR}/FLTKLibraryDepends.cmake")
INSTALL_FILES(/lib/FLTK-${FLTK_VERSION} FILES "${FLTK_BINARY_DIR}/CMake/FLTKConfig.cmake")