dotfile methods for showing the current branch name and minutes since last commit (or 'clean' if working directory has no changes)

git-prompt++

function minutes_since_last_commit {
  now=`date +%s`
  last_commit=`git log --pretty=format:'%at' -1`
  seconds_since_last_commit=$((now-last_commit))
  minutes_since_last_commit=$((seconds_since_last_commit/60))
  echo $minutes_since_last_commit
}

function has_modified_files {
  status=`git status`
  if [[ "$status" =~ "working directory clean" ]]; then
    echo ''
  else
    echo 1
  fi
}

grb_git_prompt() {
  local g="$(__gitdir)"
  if [ -n "$g" ]; then
    if [ -n "$(has_modified_files)" ]; then
      local MINUTES_SINCE_LAST_COMMIT=`minutes_since_last_commit`
      if [ "$MINUTES_SINCE_LAST_COMMIT" -gt 30 ]; then
        local COLOR=${RED}
      elif [ "$MINUTES_SINCE_LAST_COMMIT" -gt 10 ]; then
        local COLOR=${YELLOW}
      else
        local COLOR=${GREEN}
      fi
      local SINCE_LAST_COMMIT="${COLOR}$(minutes_since_last_commit)m${NORMAL}"
      # The __git_ps1 function inserts the current git branch where %s is
      local GIT_PROMPT=`__git_ps1 "(%s|${SINCE_LAST_COMMIT})"`
      echo ${GIT_PROMPT}
    else
      local COLOR=${GREEN}
      local NO_CHANGES="${COLOR}clean${NORMAL}"
      local GIT_PROMPT=`__git_ps1 "(%s|${NO_CHANGES})"`
      echo ${GIT_PROMPT}
    fi
  fi
}