#detect Mercurial revision and init rev/hash information

find_program(HGCOMMAND hg)

    execute_process(COMMAND ${HGCOMMAND} identify -in

                    WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}

                    OUTPUT_VARIABLE internal_version

                    ERROR_QUIET

    #check local repo status

    string(REGEX REPLACE "[^+]" "" HGCHANGED ${internal_version})

    string(REGEX REPLACE "[0-9a-zA-Z]+(.*) ([0-9]+)(.*)" "\\2" HEDGEWARS_REVISION ${internal_version})

    string(REGEX REPLACE "([0-9a-zA-Z]+)(.*) [0-9]+(.*)" "\\1" HEDGEWARS_HASH ${internal_version})

    if(HGCHANGED)

        message("*** You have uncommitted changes in your repository ***")

    endif()

    #let's assume that if you have hg you might be interested in debugging

    set(default_build_type "DEBUG")

    #write down hash and rev for easy picking should hg be missing

    file(WRITE "${CMAKE_SOURCE_DIR}/share/version_info.txt" "Hedgewars versioning information, do not modify\nrev ${HEDGEWARS_REVISION}\nhash ${HEDGEWARS_HASH}\n")

else()

    set(default_build_type "RELEASE")

    # when compiling outside rev control, fetch revision and hash information from version_info.txt

    find_file(version_info version_info.txt PATH ${CMAKE_SOURCE_DIR}/share)

    if(version_info)

        file(STRINGS ${version_info} internal_version REGEX "rev")

        file(STRINGS ${version_info} internal_version REGEX "hash")

        string(REGEX REPLACE "hash ([a-zA-Z0-9]*)" "\\1" HEDGEWARS_HASH ${internal_version})

    else()

        message(WARNING "${CMAKE_SOURCE_DIR}/share/version_info.txt not found, revision information "

                        "will be incorrect!!! Contact your source provider to fix this!")

        set(HEDGEWARS_REVISION "0000")

        set(HEDGEWARS_HASH "unknown")

    endif()

endif()