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# Copyright (C) 2011-2020 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_SOURCES) OR (NOT DEFINED GIT_DIR))
message(SEND_ERROR "Invalid arguments.")
endif()
get_filename_component(VERSION_SCRIPT_DIR "${CMAKE_CURRENT_LIST_FILE}" PATH)
include("${VERSION_SCRIPT_DIR}/VersionString.cmake")
# configure_file doesn't handle newlines correctly - pre-escape variables
macro(_version_escape var string)
# Escape the escape character and quotes
string(REGEX REPLACE "([\\\\\"])" "\\\\\\1" ${var} "${string}")
# Pull newlines out of string
string(REGEX REPLACE "\n" "\\\\n\"\n\t\"" ${var} "${${var}}")
endmacro()
set(var "")
foreach(arg IN LISTS VERSION_SOURCES)
if(var STREQUAL "")
set(var ${arg})
else()
parse_version_file(${var} "${arg}" ON)
set(var "")
endif()
endforeach()
# Check for a git directory and fill in the git commit hash if one exists.
unset(GIT_COMMIT)
if(NOT GIT_DIR STREQUAL "")
unset(git_head)
if(GIT_COMMAND)
execute_process(
COMMAND "${GIT_COMMAND}" "--git-dir=${GIT_DIR}" "rev-parse" "HEAD"
RESULT_VARIABLE result
OUTPUT_VARIABLE git_head
)
if(NOT "${result}" EQUAL 0)
unset(git_head)
endif()
endif()
if(NOT git_head AND EXISTS "${GIT_DIR}/HEAD")
file(READ "${GIT_DIR}/HEAD" git_head)
if(git_head MATCHES "^[ \t\r\n]*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)
unset(git_head)
if(EXISTS "${GIT_DIR}/${git_ref}")
file(READ "${GIT_DIR}/${git_ref}" git_head)
elseif(EXISTS "${GIT_DIR}/packed-refs")
file(READ "${GIT_DIR}/packed-refs" git_refs)
string(REGEX REPLACE "[^0-9A-Za-z]" "\\\\\\0" git_ref "${git_ref}")
string(REGEX MATCH "[^\r\n]* ${git_ref}( [^\r\n])?" git_head "${git_refs}")
endif()
endif()
endif()
# Create variables for all prefixes of the git comit ID.
string(REGEX MATCH "[0-9A-Za-z]+" git_commit "${git_head}")
string(LENGTH "${git_commit}" git_commit_length)
if(NOT git_commit_length LESS 40)
string(TOLOWER "${git_commit}" GIT_COMMIT)
foreach(i RANGE 20)
string(SUBSTRING "${GIT_COMMIT}" 0 ${i} GIT_COMMIT_PREFIX_${i})
set(GIT_SUFFIX_${i} " + ${GIT_COMMIT_PREFIX_${i}}")
endforeach()
else()
message(WARNING "Git repository detected, but could not determine HEAD")
endif()
endif()
configure_file("${INPUT}" "${OUTPUT}")
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