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# Copyright (C) 2011-2012 Daniel Scharrer
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#
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# This software is provided 'as-is', without any express or implied
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# warranty. In no event will the author(s) be held liable for any damages
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# arising from the use of this software.
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#
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# Permission is granted to anyone to use this software for any purpose,
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# including commercial applications, and to alter it and redistribute it
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# freely, subject to the following restrictions:
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#
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# 1. The origin of this software must not be misrepresented; you must not
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# claim that you wrote the original software. If you use this software
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# in a product, an acknowledgment in the product documentation would be
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# appreciated but is not required.
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# 2. Altered source versions must be plainly marked as such, and must not be
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# misrepresented as being the original software.
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# 3. This notice may not be removed or altered from any source distribution.
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# Create a rule to generate a version string at compile time.
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#
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# SRC is processed using the configure_file() cmake command
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# at build to produce DST with the following variable available:
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#
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# - BASE_VERSION: The contents of the file specified by VERSION_FILE.
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# - GIT_COMMIT: The current git commit. This variable is not defined if there is no GIT_DIR directory.
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# - SHORT_GIT_COMMIT: The first 10 characters of the git commit.
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# For the exact syntax of SRC see the documentation of the configure_file() cmake command.
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#
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# The version file is regenerated whenever VERSION_FILE or the current commit changes.
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function(version_file SRC DST VERSION_FILE GIT_DIR)
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get_filename_component(ABS_SRC "${SRC}" ABSOLUTE)
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get_filename_component(ABS_DST "${DST}" ABSOLUTE)
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get_filename_component(ABS_VERSION_FILE "${VERSION_FILE}" ABSOLUTE)
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get_filename_component(ABS_GIT_DIR "${GIT_DIR}" ABSOLUTE)
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set(dependencies "${ABS_VERSION_FILE}" "${CMAKE_MODULE_PATH}/VersionScript.cmake")
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if(EXISTS "${ABS_GIT_DIR}/HEAD")
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list(APPEND dependencies "${ABS_GIT_DIR}/HEAD")
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endif()
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if(EXISTS "${ABS_GIT_DIR}/logs/HEAD")
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list(APPEND dependencies "${ABS_GIT_DIR}/logs/HEAD")
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endif()
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add_custom_command(
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OUTPUT
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"${ABS_DST}"
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COMMAND
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${CMAKE_COMMAND}
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"-DINPUT=${ABS_SRC}"
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"-DOUTPUT=${ABS_DST}"
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"-DVERSION_FILE=${ABS_VERSION_FILE}"
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"-DGIT_DIR=${ABS_GIT_DIR}"
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-P "${CMAKE_MODULE_PATH}/VersionScript.cmake"
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MAIN_DEPENDENCY
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"${ABS_SRC}"
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DEPENDS
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${dependencies}
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COMMENT ""
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VERBATIM
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)
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endfunction(version_file)
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