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# Copyright (C) 2011-2012 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.
cmake_minimum_required(VERSION 2.8)
# CMake script that reads a VERSION file and the current git history and the calls configure_file().
# This is used by version_file() in VersionString.cmake
if((NOT DEFINED INPUT) OR (NOT DEFINED OUTPUT) OR (NOT DEFINED VERSION_FILE) OR (NOT DEFINED GIT_DIR))
message(SEND_ERROR "Invalid arguments.")
endif()
file(READ "${VERSION_FILE}" BASE_VERSION)
string(STRIP "${BASE_VERSION}" BASE_VERSION)
# Split the version file into lines.
string(REGEX MATCHALL "[^\r\n]+" version_lines "${BASE_VERSION}")
set(BASE_VERSION_COUNT 0)
foreach(version_line IN LISTS version_lines)
set(BASE_VERSION_${BASE_VERSION_COUNT} "${version_line}")
math(EXPR BASE_VERSION_COUNT "${BASE_VERSION_COUNT} + 1")
endforeach()
# Check for a git directory and fill in the git commit hash if one exists.
unset(GIT_COMMIT)
if(EXISTS "${GIT_DIR}")
file(READ "${GIT_DIR}/HEAD" git_head)
string(STRIP "${git_head}" git_head)
if("${git_head}" MATCHES "^ref\\:")
# Remove the first for characters from git_head to get git_ref.
# We can't use a length of -1 for string(SUBSTRING) as cmake < 2.8.5 doesn't support it.
string(LENGTH "${git_head}" git_head_length)
math(EXPR git_ref_length "${git_head_length} - 4")
string(SUBSTRING "${git_head}" 4 ${git_ref_length} git_ref)
string(STRIP "${git_ref}" git_ref)
file(READ "${GIT_DIR}/${git_ref}" git_head)
string(STRIP "${git_head}" git_head)
endif()
string(REGEX MATCH "[0-9A-Za-z]+" GIT_COMMIT "${git_head}")
# Create variables for all prefixes of the git comit ID.
if(GIT_COMMIT)
string(TOLOWER "${GIT_COMMIT}" GIT_COMMIT)
string(LENGTH "${GIT_COMMIT}" git_commit_length)
foreach(i RANGE "${git_commit_length}")
string(SUBSTRING "${GIT_COMMIT}" 0 ${i} GIT_COMMIT_PREFIX_${i})
endforeach()
endif()
endif()
configure_file("${INPUT}" "${OUTPUT}" ESCAPE_QUOTES)
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