Git prompt improvements for bash-it

gistfile1.sh

# Checks if there are commits ahead from remote
function git_prompt_ahead() {
  if [[ -n $(git log origin/$(current_branch)...HEAD --right-only 2> /dev/null | grep '^commit') ]]; then
    echo -e "$SCM_THEME_PROMPT_AHEAD"
  fi
}

# Checks if there are commits available from remote
function git_prompt_behind() {
  if [[ -n $(git log origin/$(current_branch)...HEAD --left-only 2> /dev/null | grep '^commit') ]]; then
    echo -e "$SCM_THEME_PROMPT_BEHIND"
  fi
}