[CMake] Addition to FindGit

[Quintus]

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Hi there,

I'm working on a git-versioned project that I'd like to display it's
version number for development versions like this:

1.2.3-dev (commit abc1234 on devel, 12/4/10)

CMake's FindGit module seems to be quite limited as it just gives me the
path to git's executable file, leaving it on me to invoke the necessary
EXECUTE_PROCESS() commands to find the current git branch and commit.

After some googling, I found this project which added a function
GIT_TREE_INFO() that provides information on the current commit:
http://trac.evemu.org/browser/trunk/cmake/FindGit.cmake?rev=872

Inspired by this, I wrote another function to get the current branch:

  FUNCTION(GIT_BRANCH_INFO DIR PREFIX)
    EXECUTE_PROCESS(COMMAND "${GIT_EXECUTABLE}" branch --no-color
      WORKING_DIRECTORY "${DIR}"
      RESULT_VARIABLE GIT_RESULT
      OUTPUT_VARIABLE GIT_FULL_BRANCH
      ERROR_VARIABLE GIT_ERROR
      OUTPUT_STRIP_TRAILING_WHITESPACE)

    IF(NOT ${GIT_RESULT} EQUAL 0)
      MESSAGE(SEND_ERROR "Command '${GIT_EXECUTABLE} branch --no-color'
failed with following output:\n${GIT_ERROR}")
    ENDIF(NOT ${GIT_RESULT} EQUAL 0)

    STRING(REGEX MATCH "^\\* *([^ ]*)$"
      GIT_ACTIVE_BRANCH
      "${GIT_FULL_BRANCH}")

    SET("${PREFIX}_BRANCH" "${CMAKE_MATCH_1}" PARENT_SCOPE)
  ENDFUNCTION(GIT_BRANCH_INFO)

Any chance to get this and the function from the evemu project into
official CMake's FindGit.cmake? I'm not sure about their license, but
the sourcecode seems to be licensed under LGPL -- if that's too
restrictive I can write another function providing the same functionality.

Marvin
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