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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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    # Mercurial

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    if (EXISTS ${project_path}/.hg)

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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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    else (EXISTS ${project_path}/.hg)

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    endif (EXISTS ${project_path}/.hg)

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ENDFUNCTION (FindProjectVersion)