cmake_minimum_required( VERSION 2.8 )

project( "slop" )
set( slop_VERSION_MAJOR 3 )
set( slop_VERSION_MINOR 1 )
set( slop_VERSION_PATCH 11 )

set( BIN_TARGET     "${PROJECT_NAME}" )
set( CMAKE_INSTALL_PREFIX "/usr/bin" )

# 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 -Wextra -Werror -pedantic-errors -Wno-unused-parameter" )
         # -Wall:   Enable all warnings.
         # -Wextra: Enable some more warnings.
         # -Werror: Have errors on warnings.
         # -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
              DOC "A text replacement tool used to help generate code" )
find_program( COPY_EXECUTABLE cp )
if ( GENGETOPT_EXECUTABLE AND SED_EXECUTABLE AND COPY_EXECUTABLE )
    message( "Executing " "${GENGETOPT_EXECUTABLE}" " " "--input=options.ggo" " " "--header-extension=in" )
    execute_process( COMMAND
                     "${GENGETOPT_EXECUTABLE}" "--input=options.ggo"
                     WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}/src" )
    execute_process( COMMAND
                     "${COPY_EXECUTABLE}" "cmdline.h" "cmdline.in"
                     WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}/src" )
    # Due to a bug in gengetopt, we have to manually insert some code.
    # Replace the first instance of REPLACEME with some text.
    # Eight backslashes = two in the code because of how many instances of escaping is happening.
    message( "Replacing REPLACEME in generated code..." )
    execute_process( COMMAND
                     "${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( "Command gengetopt or sed not found! Won't regenerate command line code." )
endif()

# By default our src/options.ggo has our cmake versions variables for
# the 'version ""' line. We replace them here.
configure_file( "src/cmdline.in"
                "src/cmdline.h" )

# Here we need to make sure our README has the correct version inside of it.
# We use a simple regex search and replace for it, but it seems really
# hard because cmake is silly.
# I think this is better than using configure_file since README.md needs
# to exist within github, rather than as an input file with a different
# name or extension.
message( "Replacing version in readme..." )
set( SEARCH_REGEX "slop v([0-9]+)\\.([0-9]+)\\.([0-9]+)" )
set( REPLACE_TEXT "slop v${slop_VERSION_MAJOR}.${slop_VERSION_MINOR}.${slop_VERSION_PATCH}" )
file( READ "${CMAKE_CURRENT_SOURCE_DIR}/README.md" FILE_CONTENT )
string( REGEX REPLACE "${SEARCH_REGEX}" "${REPLACE_TEXT}"
        MODIFIED_FILE_CONTENT "${FILE_CONTENT}" )
file( WRITE "${CMAKE_CURRENT_SOURCE_DIR}/README.md" "${MODIFIED_FILE_CONTENT}" )

# Sources
set( source
     src/cmdline.c
     src/rectangle.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( RT        REQUIRED )

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

# Includes
include_directories( ${X11_INCLUDE_DIR}
                     ${XEXT_INCLUDE_DIR}
                     ${RT_INCLUDE_DIR} )

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

# Libraries
target_link_libraries( "${BIN_TARGET}"
                       ${X11_LIBRARIES}
                       "${XEXT_LIBRARY}"
                       "${RT_LIBRARY}" )

install( TARGETS ${BIN_TARGET}
         DESTINATION  ${CMAKE_INSTALL_PREFIX} )