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# Copyright (C) 2011-2013 Daniel Scharrer
#
# This software is provided 'as-is', without any express or implied
# warranty. In no event will the author(s) be held liable for any damages
# arising from the use of this software.
#
# Permission is granted to anyone to use this software for any purpose,
# including commercial applications, and to alter it and redistribute it
# freely, subject to the following restrictions:
#
# 1. The origin of this software must not be misrepresented; you must not
# claim that you wrote the original software. If you use this software
# in a product, an acknowledgment in the product documentation would be
# appreciated but is not required.
# 2. Altered source versions must be plainly marked as such, and must not be
# misrepresented as being the original software.
# 3. This notice may not be removed or altered from any source distribution.
# Create a rule to generate a version string at compile time.
#
# An optional fifth argument can be used to add additional cmake defines.
#
# SRC is processed using the configure_file() cmake command
# at build to produce DST with the following variable available:
#
# VERSION_SOURCES:
# List of (${var} ${file}) pairs.
#
# for each variable ${var}
# - ${var}: The contents of the associated file
# - ${var}_COUNT: Number of lines in the associated file
# - ${var}_${i}: The ${i}-th line of the associated file
# - ${var}_${i}_SHORTNAME: The first component of the ${i}-th line of the associated file
# - ${var}_${i}_STRING: Everything except the first component of the ${i}-th line of the associated file
# - ${var}_${i}_NAME: Everything except the last component of the ${i}-th line of the associated file
# - ${var}_${i}_NUMBER: The last component of the ${i}-th line of the associated file
# - ${var}_HEAD: The first paragraph of the associated file
# - ${var}_TAIL: The remaining paragraphs of the associated file
#
# - GIT_COMMIT: The current git commit. (not defined if there is no GIT_DIR directory)
# - GIT_COMMIT_PREFIX_${i}: The first ${i} characters of GIT_COMMIT (i=0..39)
# For the exact syntax of SRC see the documentation of the configure_file() cmake command.
# The version file is regenerated whenever VERSION_FILE or the current commit changes.
function(version_file SRC DST VERSION_SOURCES GIT_DIR)
set(mode "variable")
set(args)
set(dependencies "${CMAKE_MODULE_PATH}/VersionScript.cmake")
foreach(arg IN LISTS VERSION_SOURCES)
if(mode STREQUAL "variable")
set(mode "file")
else()
get_filename_component(arg "${arg}" ABSOLUTE)
list(APPEND dependencies ${abs_file})
set(mode "variable")
endif()
list(APPEND args ${arg})
endforeach()
get_filename_component(abs_src "${SRC}" ABSOLUTE)
get_filename_component(abs_dst "${DST}" ABSOLUTE)
get_filename_component(abs_git_dir "${GIT_DIR}" ABSOLUTE)
set(defines)
if(${ARGC} GREATER 4)
set(defines ${ARGV4})
endif()
if(EXISTS "${abs_git_dir}/HEAD")
list(APPEND dependencies "${abs_git_dir}/HEAD")
endif()
if(EXISTS "${abs_git_dir}/logs/HEAD")
list(APPEND dependencies "${abs_git_dir}/logs/HEAD")
endif()
add_custom_command(
OUTPUT
"${abs_dst}"
COMMAND
${CMAKE_COMMAND}
"-DINPUT=${abs_src}"
"-DOUTPUT=${abs_dst}"
"-DVERSION_SOURCES=${args}"
"-DGIT_DIR=${abs_git_dir}"
${defines}
-P "${CMAKE_MODULE_PATH}/VersionScript.cmake"
MAIN_DEPENDENCY
"${abs_src}"
DEPENDS
${dependencies}
COMMENT ""
VERBATIM
)
endfunction(version_file)
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