A better command prompt for Mac, including git status of current directory.

Mac Command Prompt

function directory_size () {
  # Sum the number of bytes in a directory listing
  size=$(ls -l | awk 'BEGIN {x=0} NR > 1 {x+=$5} END {
    split("B KB MB GB TB PB",type);
    if (x > 0) {
      for(i=5;y < 1;i--) {
        y = x / (2**(10*i));
      }
    }
    printf "%.2f %s", y, type[i+2]
  }');
  echo "${size}";
}

function parse_git () {
  output='';
  git_status=$(git status 2> /dev/null);
  if [[ $? -eq 0 ]]; then
    output="${output}$(parse_git_branch "${git_status}")";
    output="${output}$(parse_git_ahead_behind "${git_status}")";
  fi;
  echo "${output}"
}
function parse_git_ahead_behind () {
  output='';
  ahead=($(grep 'ahead' <<< "${1}"));
  if [[ ${#ahead[*]} -gt 0 ]]; then
    for ((i = 0; i < ${#ahead[*]}; i++ )); do
      string="${ahead[$i]}";
      if [ -n "$(grep commit <<< "${string}")" ]; then
        let i=i-1;
        output="${output}(+${ahead[$i]})";
        break;
      fi;
    done;
  fi;
  behind=($(grep 'behind' <<< "${1}"));
  if [[ ${#behind[*]} -gt 0 ]]; then
    for ((i = 0; i < ${#behind[*]}; i++ )); do
      string="${behind[$i]}";
      if [ -n "$(grep commit <<< "${string}")" ]; then
        let i=i-1;
        output="${output}(-${behind[$i]})";
        break;
      fi;
    done;
  fi;
  echo "${output}"
}

function parse_git_branch () {
  git branch --no-color 2> /dev/null | sed -e '/^[^*]/d' -e "s/* \(.*\)/ (\1$(parse_git_clean "${1}"))/"
}

function parse_git_clean () {
  [[ $(tail -n1 <<< "${1}") != "nothing to commit (working directory clean)" ]] && echo "*"
}

export PS1="\n\
\[\e[0;33m\][\$(date '+%m-%d %H:%M')]
\[\e[0;36m\]\$(directory_size) - \w\$(parse_git)\[\e[0m\]\n\
\[\e[0;38m\]\u\[\e[0;37m\]@\[\e[0;32m\]\h\[\e[0;37m\]$ \[\e[m\]";

if [ "$(id -u)" -eq 0 ]; then
export PS1="\n\
\[\e[0;31m\][\$(date '+%m-%d %H:%M')]
\[\e[0;35m\]\$(directory_size) - \w\$(parse_git)\[\e[0m\]\n\
\[\e[0;38m\]\u\[\e[0;37m\]@\[\e[1;31m\]\h\[\e[0;37m\]# \[\e[m\]";
fi

export LSCOLORS=ExFxCxDxBxegedabagacad