class Git::Lib

def command(cmd, opts = [], chdir = true, redirect = '', &block)
  ENV['GIT_DIR'] = @git_dir
  ENV['GIT_INDEX_FILE'] = @git_index_file
  ENV['GIT_WORK_TREE'] = @git_work_dir
  path = @git_work_dir || @git_dir || @path
  opts = [opts].flatten.map {|s| escape(s) }.join(' ')
  git_cmd = "git #{cmd} #{opts} #{redirect} 2>&1"
  out = nil
  if chdir && (Dir.getwd != path)
    Dir.chdir(path) { out = run_command(git_cmd, &block) } 
  else
    out = run_command(git_cmd, &block)
  end
  
  if @logger
    @logger.info(git_cmd)
    @logger.debug(out)
  end
        
  if $?.exitstatus > 0
    if $?.exitstatus == 1 && out == ''
      return ''
    end
    raise Git::GitExecuteError.new(git_cmd + ':' + out.to_s) 
  end
  out
end