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      1 # - Returns a version string from Git tags
      2 #
      3 # This function inspects the annotated git tags for the project and returns a string
      4 # into a CMake variable
      5 #
      6 #  get_git_version(<var>)
      7 #
      8 # - Example
      9 #
     10 # include(GetGitVersion)
     11 # get_git_version(GIT_VERSION)
     12 #
     13 # Requires CMake 2.8.11+
     14 find_package(Git)
     15 
     16 if(__get_git_version)
     17   return()
     18 endif()
     19 set(__get_git_version INCLUDED)
     20 
     21 function(get_git_version var)
     22   if(GIT_EXECUTABLE)
     23       execute_process(COMMAND ${GIT_EXECUTABLE} describe --match "v[0-9]*.[0-9]*.[0-9]*" --abbrev=8
     24           RESULT_VARIABLE status
     25           OUTPUT_VARIABLE GIT_VERSION
     26           ERROR_QUIET)
     27       if(${status})
     28           set(GIT_VERSION "v0.0.0")
     29       else()
     30           string(STRIP ${GIT_VERSION} GIT_VERSION)
     31           string(REGEX REPLACE "-[0-9]+-g" "-" GIT_VERSION ${GIT_VERSION})
     32       endif()
     33 
     34       # Work out if the repository is dirty
     35       execute_process(COMMAND ${GIT_EXECUTABLE} update-index -q --refresh
     36           OUTPUT_QUIET
     37           ERROR_QUIET)
     38       execute_process(COMMAND ${GIT_EXECUTABLE} diff-index --name-only HEAD --
     39           OUTPUT_VARIABLE GIT_DIFF_INDEX
     40           ERROR_QUIET)
     41       string(COMPARE NOTEQUAL "${GIT_DIFF_INDEX}" "" GIT_DIRTY)
     42       if (${GIT_DIRTY})
     43           set(GIT_VERSION "${GIT_VERSION}-dirty")
     44       endif()
     45   else()
     46       set(GIT_VERSION "v0.0.0")
     47   endif()
     48 
     49   message("-- git Version: ${GIT_VERSION}")
     50   set(${var} ${GIT_VERSION} PARENT_SCOPE)
     51 endfunction()
     52