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#

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# CMake build script to determine project version number.

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#

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# this will set PROJECT_VERSION to a string

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#

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FUNCTION (FindProjectVersion project_path)

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    # XXX: only support mercurial for now

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    MESSAGE (STATUS "project_path=${project_path}")

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    # first, determine tag

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    EXECUTE_PROCESS (

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        COMMAND hg identify --tag

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        WORKING_DIRECTORY "${project_path}"

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        RESULT_VARIABLE hg_error_code 

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        OUTPUT_VARIABLE hg_tag

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        OUTPUT_STRIP_TRAILING_WHITESPACE

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    )

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    if (hg_error_code)

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        MESSAGE (FATAL_ERROR "`hg identify --tag` failed")

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    endif (hg_error_code)

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    # if tag is other than tip, use that

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    if ("${hg_tag}" STREQUAL "tip")

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        # use the revision hash

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        EXECUTE_PROCESS (

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            COMMAND hg identify --id

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            WORKING_DIRECTORY "${project_path}"

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            RESULT_VARIABLE hg_error_code 

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            OUTPUT_VARIABLE hg_id

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            OUTPUT_STRIP_TRAILING_WHITESPACE

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        )

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        if (hg_error_code)

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            MESSAGE (FATAL_ERROR "`hg identify --id` failed")

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        endif (hg_error_code)

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        SET (PROJECT_VERSION "${hg_id}" PARENT_SCOPE)

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        MESSAGE (STATUS "Version: mercurial tip id: ${hg_id}")

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    else ("${hg_tag}" STREQUAL "tip")

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        SET (PROJECT_VERSION "${hg_tag}" PARENT_SCOPE)

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        MESSAGE (STATUS "Version: mercurial tag: ${hg_tag}")

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    endif ("${hg_tag}" STREQUAL "tip")

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ENDFUNCTION (FindProjectVersion)