project(GitUpdateTest)

cmake_minimum_required(VERSION 2.8)

if(WIN32)
  option(USE_GIT_EXE OFF "Prefer git.exe instead of git.cmd")
endif()

set(Git_FOUND 0)
set(GIT_EXECUTABLE GIT_EXECUTABLE-NOTFOUND)
if(USE_GIT_EXE)
  if(EXISTS "C:/Program Files (x86)/Git/bin/git.exe")
    set(GIT_EXECUTABLE "C:/Program Files (x86)/Git/bin/git.exe" CACHE FILEPATH "prefer git.exe" FORCE)
  elseif(EXISTS "C:/Program Files/Git/bin/git.exe")
    set(GIT_EXECUTABLE "C:/Program Files/Git/bin/git.exe" CACHE FILEPATH "prefer git.exe" FORCE)
  endif()
endif()

find_package(Git REQUIRED)
message("GIT_EXECUTABLE: ${GIT_EXECUTABLE}")

set(git_repo_dir "${CMAKE_CURRENT_BINARY_DIR}/test_repo")

file(APPEND "${git_repo_dir}/test.txt" "text\n")

add_custom_target(UpdateGitRepo ALL
  COMMAND ${GIT_EXECUTABLE} init
  COMMAND ${GIT_EXECUTABLE} add test.txt
  COMMAND ${GIT_EXECUTABLE} commit -m "Bla"
  WORKING_DIRECTORY ${git_repo_dir}
  )