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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  

# 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)

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)

        else()

                configure_file("@GIT_DIR@/packed-refs" "@GIT_DATA@/packed-refs" COPYONLY)

                file(READ "@GIT_DATA@/packed-refs" PACKED_REFS)

                if(${PACKED_REFS} MATCHES "([0-9a-z]*) ${HEAD_REF}")

                        set(HEAD_HASH "${CMAKE_MATCH_1}")

                endif()

        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()