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+# - Returns a version string from Git
+#
+# These functions force a re-configure on each git commit so that you can
+# trust the values of the variables in your build system.
+#
+# get_git_head_revision(<refspecvar> <hashvar> [ALLOW_LOOKING_ABOVE_CMAKE_SOURCE_DIR])
+#
+# Returns the refspec and sha hash of the current head revision
+#
+# git_describe(<var> [<additional arguments to git describe> ...])
+#
+# Returns the results of git describe on the source tree, and adjusting
+# the output so that it tests false if an error occurs.
+#
+# git_describe_working_tree(<var> [<additional arguments to git describe> ...])
+#
+# Returns the results of git describe on the working tree (--dirty option),
+# and adjusting the output so that it tests false if an error occurs.
+#
+# git_get_exact_tag(<var> [<additional arguments to git describe> ...])
+#
+# Returns the results of git describe --exact-match on the source tree,
+# and adjusting the output so that it tests false if there was no exact
+# matching tag.
+#
+# git_local_changes(<var>)
+#
+# Returns either "CLEAN" or "DIRTY" with respect to uncommitted changes.
+# Uses the return code of "git diff-index --quiet HEAD --".
+# Does not regard untracked files.
+#
+# Requires CMake 2.6 or newer (uses the 'function' command)
+#
+# Original Author:
+# 2009-2020 Ryan Pavlik <ryan.pavlik@gmail.com> <abiryan@ryand.net>
+# http://academic.cleardefinition.com
+#
+# Copyright 2009-2013, Iowa State University.
+# Copyright 2013-2020, Ryan Pavlik
+# Copyright 2013-2020, Contributors
+# SPDX-License-Identifier: BSL-1.0
+# Distributed under the Boost Software License, Version 1.0.
+# (See accompanying file LICENSE_1_0.txt or copy at
+# http://www.boost.org/LICENSE_1_0.txt)
+
+if(__get_git_revision_description)
+ return()
+endif()
+set(__get_git_revision_description YES)
+
+# We must run the following at "include" time, not at function call time,
+# to find the path to this module rather than the path to a calling list file
+get_filename_component(_gitdescmoddir ${CMAKE_CURRENT_LIST_FILE} PATH)
+
+# Function _git_find_closest_git_dir finds the next closest .git directory
+# that is part of any directory in the path defined by _start_dir.
+# The result is returned in the parent scope variable whose name is passed
+# as variable _git_dir_var. If no .git directory can be found, the
+# function returns an empty string via _git_dir_var.
+#
+# Example: Given a path C:/bla/foo/bar and assuming C:/bla/.git exists and
+# neither foo nor bar contain a file/directory .git. This wil return
+# C:/bla/.git
+#
+function(_git_find_closest_git_dir _start_dir _git_dir_var)
+ set(cur_dir "${_start_dir}")
+ set(git_dir "${_start_dir}/.git")
+ while(NOT EXISTS "${git_dir}")
+ # .git dir not found, search parent directories
+ set(git_previous_parent "${cur_dir}")
+ get_filename_component(cur_dir ${cur_dir} DIRECTORY)
+ if(cur_dir STREQUAL git_previous_parent)
+ # We have reached the root directory, we are not in git
+ set(${_git_dir_var}
+ ""
+ PARENT_SCOPE)
+ return()
+ endif()
+ set(git_dir "${cur_dir}/.git")
+ endwhile()
+ set(${_git_dir_var}
+ "${git_dir}"
+ PARENT_SCOPE)
+endfunction()
+
+function(get_git_head_revision _refspecvar _hashvar)
+ _git_find_closest_git_dir("${CMAKE_CURRENT_SOURCE_DIR}" GIT_DIR)
+
+ if("${ARGN}" STREQUAL "ALLOW_LOOKING_ABOVE_CMAKE_SOURCE_DIR")
+ set(ALLOW_LOOKING_ABOVE_CMAKE_SOURCE_DIR TRUE)
+ else()
+ set(ALLOW_LOOKING_ABOVE_CMAKE_SOURCE_DIR FALSE)
+ endif()
+ if(NOT "${GIT_DIR}" STREQUAL "")
+ file(RELATIVE_PATH _relative_to_source_dir "${CMAKE_SOURCE_DIR}"
+ "${GIT_DIR}")
+ if("${_relative_to_source_dir}" MATCHES "[.][.]" AND NOT ALLOW_LOOKING_ABOVE_CMAKE_SOURCE_DIR)
+ # We've gone above the CMake root dir.
+ set(GIT_DIR "")
+ endif()
+ endif()
+ if("${GIT_DIR}" STREQUAL "")
+ set(${_refspecvar}
+ "GITDIR-NOTFOUND"
+ PARENT_SCOPE)
+ set(${_hashvar}
+ "GITDIR-NOTFOUND"
+ PARENT_SCOPE)
+ return()
+ endif()
+
+ # Check if the current source dir is a git submodule or a worktree.
+ # In both cases .git is a file instead of a directory.
+ #
+ if(NOT IS_DIRECTORY ${GIT_DIR})
+ # The following git command will return a non empty string that
+ # points to the super project working tree if the current
+ # source dir is inside a git submodule.
+ # Otherwise the command will return an empty string.
+ #
+ execute_process(
+ COMMAND "${GIT_EXECUTABLE}" rev-parse
+ --show-superproject-working-tree
+ WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}"
+ OUTPUT_VARIABLE out
+ ERROR_QUIET OUTPUT_STRIP_TRAILING_WHITESPACE)
+ if(NOT "${out}" STREQUAL "")
+ # If out is empty, GIT_DIR/CMAKE_CURRENT_SOURCE_DIR is in a submodule
+ file(READ ${GIT_DIR} submodule)
+ string(REGEX REPLACE "gitdir: (.*)$" "\\1" GIT_DIR_RELATIVE
+ ${submodule})
+ string(STRIP ${GIT_DIR_RELATIVE} GIT_DIR_RELATIVE)
+ get_filename_component(SUBMODULE_DIR ${GIT_DIR} PATH)
+ get_filename_component(GIT_DIR ${SUBMODULE_DIR}/${GIT_DIR_RELATIVE}
+ ABSOLUTE)
+ set(HEAD_SOURCE_FILE "${GIT_DIR}/HEAD")
+ else()
+ # GIT_DIR/CMAKE_CURRENT_SOURCE_DIR is in a worktree
+ file(READ ${GIT_DIR} worktree_ref)
+ # The .git directory contains a path to the worktree information directory
+ # inside the parent git repo of the worktree.
+ #
+ string(REGEX REPLACE "gitdir: (.*)$" "\\1" git_worktree_dir
+ ${worktree_ref})
+ string(STRIP ${git_worktree_dir} git_worktree_dir)
+ _git_find_closest_git_dir("${git_worktree_dir}" GIT_DIR)
+ set(HEAD_SOURCE_FILE "${git_worktree_dir}/HEAD")
+ endif()
+ else()
+ set(HEAD_SOURCE_FILE "${GIT_DIR}/HEAD")
+ endif()
+ set(GIT_DATA "${CMAKE_CURRENT_BINARY_DIR}/CMakeFiles/git-data")
+ if(NOT EXISTS "${GIT_DATA}")
+ file(MAKE_DIRECTORY "${GIT_DATA}")
+ endif()
+
+ if(NOT EXISTS "${HEAD_SOURCE_FILE}")
+ return()
+ endif()
+ set(HEAD_FILE "${GIT_DATA}/HEAD")
+ configure_file("${HEAD_SOURCE_FILE}" "${HEAD_FILE}" COPYONLY)
+
+ configure_file("${_gitdescmoddir}/GetGitRevisionDescription.cmake.in"
+ "${GIT_DATA}/grabRef.cmake" @ONLY)
+ include("${GIT_DATA}/grabRef.cmake")
+
+ set(${_refspecvar}
+ "${HEAD_REF}"
+ PARENT_SCOPE)
+ set(${_hashvar}
+ "${HEAD_HASH}"
+ PARENT_SCOPE)
+endfunction()
+
+function(git_describe _var)
+ if(NOT GIT_FOUND)
+ find_package(Git QUIET)
+ endif()
+ get_git_head_revision(refspec hash)
+ if(NOT GIT_FOUND)
+ set(${_var}
+ "GIT-NOTFOUND"
+ PARENT_SCOPE)
+ return()
+ endif()
+ if(NOT hash)
+ set(${_var}
+ "HEAD-HASH-NOTFOUND"
+ PARENT_SCOPE)
+ return()
+ endif()
+
+ # TODO sanitize
+ #if((${ARGN}" MATCHES "&&") OR
+ # (ARGN MATCHES "||") OR
+ # (ARGN MATCHES "\\;"))
+ # message("Please report the following error to the project!")
+ # message(FATAL_ERROR "Looks like someone's doing something nefarious with git_describe! Passed arguments ${ARGN}")
+ #endif()
+
+ #message(STATUS "Arguments to execute_process: ${ARGN}")
+
+ execute_process(
+ COMMAND "${GIT_EXECUTABLE}" describe --tags --always ${hash} ${ARGN}
+ WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}"
+ RESULT_VARIABLE res
+ OUTPUT_VARIABLE out
+ ERROR_QUIET OUTPUT_STRIP_TRAILING_WHITESPACE)
+ if(NOT res EQUAL 0)
+ set(out "${out}-${res}-NOTFOUND")
+ endif()
+
+ set(${_var}
+ "${out}"
+ PARENT_SCOPE)
+endfunction()
+
+function(git_describe_working_tree _var)
+ if(NOT GIT_FOUND)
+ find_package(Git QUIET)
+ endif()
+ if(NOT GIT_FOUND)
+ set(${_var}
+ "GIT-NOTFOUND"
+ PARENT_SCOPE)
+ return()
+ endif()
+
+ execute_process(
+ COMMAND "${GIT_EXECUTABLE}" describe --dirty ${ARGN}
+ WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}"
+ RESULT_VARIABLE res
+ OUTPUT_VARIABLE out
+ ERROR_QUIET OUTPUT_STRIP_TRAILING_WHITESPACE)
+ if(NOT res EQUAL 0)
+ set(out "${out}-${res}-NOTFOUND")
+ endif()
+
+ set(${_var}
+ "${out}"
+ PARENT_SCOPE)
+endfunction()
+
+function(git_get_exact_tag _var)
+ git_describe(out --exact-match ${ARGN})
+ set(${_var}
+ "${out}"
+ PARENT_SCOPE)
+endfunction()
+
+function(git_local_changes _var)
+ if(NOT GIT_FOUND)
+ find_package(Git QUIET)
+ endif()
+ get_git_head_revision(refspec hash)
+ if(NOT GIT_FOUND)
+ set(${_var}
+ "GIT-NOTFOUND"
+ PARENT_SCOPE)
+ return()
+ endif()
+ if(NOT hash)
+ set(${_var}
+ "HEAD-HASH-NOTFOUND"
+ PARENT_SCOPE)
+ return()
+ endif()
+
+ execute_process(
+ COMMAND "${GIT_EXECUTABLE}" diff-index --quiet HEAD --
+ WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}"
+ RESULT_VARIABLE res
+ OUTPUT_VARIABLE out
+ ERROR_QUIET OUTPUT_STRIP_TRAILING_WHITESPACE)
+ if(res EQUAL 0)
+ set(${_var}
+ "CLEAN"
+ PARENT_SCOPE)
+ else()
+ set(${_var}
+ "DIRTY"
+ PARENT_SCOPE)
+ endif()
+endfunction()