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#
# Internal file for GetGitRevisionDescription.cmake
#
# Requires CMake 2.6 or newer (uses the 'function' command)
#
# Original Author:
# 2009-2010 Ryan Pavlik <rpavlik@iastate.edu> <abiryan@ryand.net>
# http://academic.cleardefinition.com
# Iowa State University HCI Graduate Program/VRAC
#
# Copyright Iowa State University 2009-2010.
# 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)
set(HEAD_HASH)
file(READ "@HEAD_FILE@" HEAD_CONTENTS LIMIT 1024)
string(STRIP "${HEAD_CONTENTS}" HEAD_CONTENTS)
set(GIT_DIR "@GIT_DIR@")
# handle git-worktree
if(EXISTS "${GIT_DIR}/commondir")
file(READ "${GIT_DIR}/commondir" GIT_DIR_NEW LIMIT 1024)
string(STRIP "${GIT_DIR_NEW}" GIT_DIR_NEW)
if(NOT IS_ABSOLUTE "${GIT_DIR_NEW}")
get_filename_component(GIT_DIR_NEW ${GIT_DIR}/${GIT_DIR_NEW} ABSOLUTE)
endif()
if(EXISTS "${GIT_DIR_NEW}")
set(GIT_DIR "${GIT_DIR_NEW}")
endif()
endif()
if(HEAD_CONTENTS MATCHES "ref")
# named branch
string(REPLACE "ref: " "" HEAD_REF "${HEAD_CONTENTS}")
if(EXISTS "${GIT_DIR}/${HEAD_REF}")
configure_file("${GIT_DIR}/${HEAD_REF}" "@GIT_DATA@/head-ref" COPYONLY)
elseif(EXISTS "${GIT_DIR}/logs/${HEAD_REF}")
configure_file("${GIT_DIR}/logs/${HEAD_REF}" "@GIT_DATA@/head-ref" COPYONLY)
set(HEAD_HASH "${HEAD_REF}")
endif()
else()
# detached HEAD
configure_file("${GIT_DIR}/HEAD" "@GIT_DATA@/head-ref" COPYONLY)
endif()
if(NOT HEAD_HASH)
file(READ "@GIT_DATA@/head-ref" HEAD_HASH LIMIT 1024)
string(STRIP "${HEAD_HASH}" HEAD_HASH)
endif()
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