option(SC_EL_BYTECOMPILE "Build emacs-based IDE." ON)
mark_as_advanced(SC_EL_BYTECOMPILE)

file(GLOB scel_sources
     RELATIVE ${CMAKE_CURRENT_SOURCE_DIR} *.el)

list(REMOVE_ITEM scel_sources ".dir-locals.el")

file(GLOB_RECURSE local-load-path
    LIST_DIRECTORIES true
    "~/.emacs.d/site-lisp/*"
    "~/.emacs.d/elpa/*")

set(all_scel_sources ${scel_sources} sclang-vars.el)

set(PKG_DATA_DIR ${CMAKE_INSTALL_PREFIX}/share/SuperCollider)

configure_file(sclang-vars.el.in
               ${CMAKE_CURRENT_BINARY_DIR}/sclang-vars.el)

foreach (el ${scel_sources})
    configure_file(${el} ${CMAKE_CURRENT_BINARY_DIR}/${el})
endforeach()

set(all_scel_sources ${scel_sources} sclang-vars.el)

install (FILES ${scel_sources} ${CMAKE_CURRENT_BINARY_DIR}/sclang-vars.el
            DESTINATION share/emacs/site-lisp/SuperCollider)

if (SC_EL_BYTECOMPILE)
    find_program(EMACS_EXECUTABLE emacs)
    if(EMACS_EXECUTABLE-NOTFOUND)
        message(SEND_ERROR "Emacs could not be found.\n (If emacs interface is not required, then set SC_EL=no)")
    endif()

    find_program(W3M_EXECUTABLE w3m)
    if(W3M_EXECUTABLE-NOTFOUND)
        message(SEND_ERROR "Install w3m to build the help viewer.")
    endif()

    foreach (el ${all_scel_sources})
        add_custom_command(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/${el}c
            COMMAND ${EMACS_EXECUTABLE} -batch
                -L ${CMAKE_CURRENT_BINARY_DIR}
                -L ${local-load-path}
                -f batch-byte-compile
                ${CMAKE_CURRENT_BINARY_DIR}/${el}
            DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/${el}
            WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
            COMMENT "Creating byte-compiled Emacs lisp ${CMAKE_CURRENT_BINARY_DIR}/${el}c")

        add_custom_target(compile_${el}c ALL
        DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/${el}c)

        install(FILES ${CMAKE_CURRENT_BINARY_DIR}/${el}c
        DESTINATION share/emacs/site-lisp/SuperCollider)
    endforeach()
endif()