cmake_minimum_required( VERSION 2.8 )

project( "slop" )
set( slop_VERSION_MAJOR 4 )
set( slop_VERSION_MINOR 2 )
set( slop_VERSION_PATCH 16 )

set( BIN_TARGET     "${PROJECT_NAME}" )
if( NOT CMAKE_INSTALL_PREFIX )
   set( CMAKE_INSTALL_PREFIX "/usr" )
endif()

if( NOT CMAKE_CONFIGURATION_TYPES AND NOT CMAKE_BUILD_TYPE )
   set( CMAKE_BUILD_TYPE RelWithDebInfo )
endif()

# Linux compiler initialization.
if ( "${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang" OR
     "${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU" OR
     "${CMAKE_CXX_COMPILER_ID}" STREQUAL "Intel" )
     set( CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wno-unused-parameter" )
     set( CMAKE_CXX_FLAGS_DEBUG "-Wextra -pedantic-errors -O0 -g" )
     set( CMAKE_CXX_FLAGS_RELEASE "-O2" )
     set( CMAKE_CXX_FLAGS_RELWITHDEBINFO "-O2 -g" )
         # -Wall:   Enable all warnings.
         # -Wextra: Enable some more warnings.
         # -Werror: Have errors on warnings.
         # -pedantic-errors: Even more errors.
         # -Wno-unused-parameter: Prevent unused variable warning. (Several functions are required to have unecessary variables because X11.)
else()
    message( FATAL_ERROR "Your operating system isn't supported yet! CMake will now exit." )
endif()

# Add a check target for our makefile.
find_program( CPPCHECK_EXECUTABLE cppcheck
              DOC "A tool for static C/C++ code analysis." )
if (CPPCHECK_EXECUTABLE)
    add_custom_target( "check"
                       COMMAND "${CPPCHECK_EXECUTABLE}" "--enable=all" "*"
                       WORKING_DIRECTORY src VERBATIM )
endif()

# Here we generate some of our code if we can. I package it pre-generated
# so nobody has to go find and install gengetopt if they don't want to.
find_program( GENGETOPT_EXECUTABLE gengetopt
              DOC "A tool to generate code to grab command line options." )
find_program( SED_EXECUTABLE sed )
if ( GENGETOPT_EXECUTABLE AND SED_EXECUTABLE )
    message( "-- Regenerating cmdline.in" )
    # gengetopt generates cmdline.h, then we move it to cmdline.in.
    execute_process( COMMAND "${GENGETOPT_EXECUTABLE}" "--input=options.ggo"
                     WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}/src" )
    file( RENAME "${CMAKE_CURRENT_SOURCE_DIR}/src/cmdline.h" "${CMAKE_CURRENT_SOURCE_DIR}/src/cmdline.in" )
    # Due to a bug in gengetopt, we have to manually insert some code.
    # Replace the first instance of REPLACEME with some text.
    # Eight backslashes = two in the code because of how many instances of escaping is happening.
    execute_process( COMMAND "${SED_EXECUTABLE}" "-i" "0,/REPLACEME/{s/REPLACEME/X=%x\\\\\\\\nY=%y\\\\\\\\nW=%w\\\\\\\\nH=%h\\\\\\\\nG=%g\\\\\\\\nID=%i\\\\\\\\nCancel=%c\\\\\\\\n/}" "cmdline.c"
                     WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}/src" )
    # Then replace remaining instances.
    execute_process( COMMAND "${SED_EXECUTABLE}" "-i" "s/REPLACEME/X=%x\\\\nY=%y\\\\nW=%w\\\\nH=%h\\\\nG=%g\\\\nID=%i\\\\nCancel=%c\\\\n/" "cmdline.c"
                     WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}/src" )
else()
    message( "Warning: Command gengetopt or sed not found! Won't regenerate command line code. (If you're just compiling this doesn't matter.)" )
endif()

# By default our src/options.ggo has our cmake versions variables for
# the 'version ""' line. We replace them here.
# The ${CMAKE_SOURCE_DIR} is there to fix problems with OpenBSD's out-of-source build black magic.
configure_file( "src/cmdline.in" "${CMAKE_SOURCE_DIR}/src/cmdline.h" )

# This allows for "make README.md" to be ran to update the README's help
# section automatically. We don't add it to ALL because running arbitrary
# scripts is unsafe and I don't know if systems will actually have it
# be executbable.
add_custom_target( README.md "./generateReadme.sh" DEPENDS "slop" )

# Sources
set( source
     src/cmdline.c
     src/selectrectangle.cpp
     src/glselectrectangle.cpp
     src/xselectrectangle.cpp
     src/x.cpp
     src/main.cpp )

# Obtain library paths and make sure they exist.
set( CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_SOURCE_DIR}/cmakemodules" )
find_package( X11       REQUIRED )
find_package( XExt      REQUIRED )
find_package( OpenGL    REQUIRED )
find_package( GLX       REQUIRED )
find_package( XRender   REQUIRED )
# This library is needed only for Ubuntu it seems, some platforms don't even
# ship with it. I couldn't find a way to do a test compile to check if librt
# was needed, so instead I just didn't mark it as REQUIRED.
find_package( RT )

set( CMAKE_CXX_FLAGS
     "${CMAKE_CXX_FLAGS} ${CMAKE_IMLIB2_CXX_FLAGS}" )

# Includes
if ( RT_INCLUDE_DIR )
    include_directories( ${X11_INCLUDE_DIR}
                         ${XEXT_INCLUDE_DIR}
                         ${OPENGL_INCLUDE_DIR}
                         ${GLX_INCLUDE_DIR}
                         ${XRENDER_INCLUDE_DIRS}
                         ${RT_INCLUDE_DIR} )
else()
    include_directories( ${X11_INCLUDE_DIR}
                         ${OPENGL_INCLUDE_DIR}
                         ${GLX_INCLUDE_DIR}
                         ${XEXT_INCLUDE_DIR} )
endif()

# Executable
add_executable( "${BIN_TARGET}" ${source} )

# Libraries
if ( RT_LIBRARY )
    target_link_libraries( "${BIN_TARGET}"
                           ${X11_LIBRARIES}
                           ${OPENGL_LIBRARIES}
                           ${GLX_LIBRARIES}
                           ${XRENDER_LIBRARIES}
                           "${XEXT_LIBRARY}"
                           "${RT_LIBRARY}" )
else()
    target_link_libraries( "${BIN_TARGET}"
                           ${OPENGL_LIBRARIES}
                           ${GLX_LIBRARIES}
                           ${X11_LIBRARIES}
                           "${XEXT_LIBRARY}" )
endif()

install( TARGETS ${BIN_TARGET}
         DESTINATION "${CMAKE_INSTALL_PREFIX}/bin" )