| # - Returns a version string from Git tags | 
 | # | 
 | # This function inspects the annotated git tags for the project and returns a string | 
 | # into a CMake variable | 
 | # | 
 | #  get_git_version(<var>) | 
 | # | 
 | # - Example | 
 | # | 
 | # include(GetGitVersion) | 
 | # get_git_version(GIT_VERSION) | 
 | # | 
 | # Requires CMake 2.8.11+ | 
 | find_package(Git) | 
 |  | 
 | if(__get_git_version) | 
 |   return() | 
 | endif() | 
 | set(__get_git_version INCLUDED) | 
 |  | 
 | function(get_git_version var) | 
 |   if(GIT_EXECUTABLE) | 
 |       execute_process(COMMAND ${GIT_EXECUTABLE} describe --match "v[0-9]*.[0-9]*.[0-9]*" --abbrev=8 | 
 |           WORKING_DIRECTORY ${PROJECT_SOURCE_DIR} | 
 |           RESULT_VARIABLE status | 
 |           OUTPUT_VARIABLE GIT_VERSION | 
 |           ERROR_QUIET) | 
 |       if(${status}) | 
 |           set(GIT_VERSION "v0.0.0") | 
 |       else() | 
 |           string(STRIP ${GIT_VERSION} GIT_VERSION) | 
 |           string(REGEX REPLACE "-[0-9]+-g" "-" GIT_VERSION ${GIT_VERSION}) | 
 |       endif() | 
 |  | 
 |       # Work out if the repository is dirty | 
 |       execute_process(COMMAND ${GIT_EXECUTABLE} update-index -q --refresh | 
 |           WORKING_DIRECTORY ${PROJECT_SOURCE_DIR} | 
 |           OUTPUT_QUIET | 
 |           ERROR_QUIET) | 
 |       execute_process(COMMAND ${GIT_EXECUTABLE} diff-index --name-only HEAD -- | 
 |           WORKING_DIRECTORY ${PROJECT_SOURCE_DIR} | 
 |           OUTPUT_VARIABLE GIT_DIFF_INDEX | 
 |           ERROR_QUIET) | 
 |       string(COMPARE NOTEQUAL "${GIT_DIFF_INDEX}" "" GIT_DIRTY) | 
 |       if (${GIT_DIRTY}) | 
 |           set(GIT_VERSION "${GIT_VERSION}-dirty") | 
 |       endif() | 
 |   else() | 
 |       set(GIT_VERSION "v0.0.0") | 
 |   endif() | 
 |  | 
 |   message("-- git Version: ${GIT_VERSION}") | 
 |   set(${var} ${GIT_VERSION} PARENT_SCOPE) | 
 | endfunction() |