local ret_status="%{%F{blue}%}➜%{$reset_color%}"
local return_status="%{$fg[red]%}%(?..⏎)%{$reset_color%} "

function _prompt_char() {
  if $(git rev-parse --is-inside-work-tree >/dev/null 2>&1); then
    echo "%{%F{blue}%}±%{%f%k%b%}"
  else
    echo '%{%F{blue}%}λ%{%f%k%b%}'
  fi
}

function get_pwd(){
  git_root=$PWD
  while [[ $git_root != / && ! -e $git_root/.git ]]; do
    git_root=$git_root:h
  done
  if [[ $git_root = / ]]; then
    unset git_root
    prompt_short_dir=%~
  else
    parent=${git_root%\/*}
    prompt_short_dir=${PWD#$parent/}
  fi
  echo $prompt_short_dir
}

# Determine the time since last commit. If branch is clean,
# use a neutral color, otherwise colors will vary according to time.
function git_time_since_commit() {
    if git rev-parse --git-dir > /dev/null 2>&1; then
        # Only proceed if there is actually a commit.
        if [[ $(git log 2>&1 > /dev/null | grep -c "^fatal") == 0 ]]; then
            # Get the last commit.
            last_commit=`git log --pretty=format:'%at' -1 2> /dev/null`
            now=`date +%s`
            seconds_since_last_commit=$((now-last_commit))

            # Totals
            MINUTES=$((seconds_since_last_commit / 60))
            HOURS=$((seconds_since_last_commit/3600))

            # Sub-hours and sub-minutes
            DAYS=$((seconds_since_last_commit / 86400))
            SUB_HOURS=$((HOURS % 24))
            SUB_MINUTES=$((MINUTES % 60))

            if [[ -n $(git status -s 2> /dev/null) ]]; then
                if [ "$MINUTES" -gt 30 ]; then
                    COLOR="$ZSH_THEME_GIT_TIME_SINCE_COMMIT_LONG"
                elif [ "$MINUTES" -gt 10 ]; then
                    COLOR="$ZSH_THEME_GIT_TIME_SHORT_COMMIT_MEDIUM"
                else
                    COLOR="$ZSH_THEME_GIT_TIME_SINCE_COMMIT_SHORT"
                fi
            else
                COLOR="$ZSH_THEME_GIT_TIME_SINCE_COMMIT_NEUTRAL"
            fi

            if [ "$HOURS" -gt 24 ]; then
                echo "[$COLOR${DAYS}d%{$reset_color%}]"
            elif [ "$MINUTES" -gt 60 ]; then
                echo "[$COLOR${HOURS}h%{$reset_color%}]"
            else
                echo "[$COLOR${MINUTES}m%{$reset_color%}]"
            fi
        else
            COLOR="$ZSH_THEME_GIT_TIME_SINCE_COMMIT_NEUTRAL"
            echo "[$COLOR~]"
        fi
    fi
}

# Format for git_prompt_long_sha() and git_prompt_short_sha()
ZSH_THEME_GIT_PROMPT_SHA_BEFORE="➤ %{%F{yellow}%}"
ZSH_THEME_GIT_PROMPT_SHA_AFTER="%{$reset_color%}"

ZSH_THEME_GIT_PROMPT_PREFIX="|%{%F{cyan}%}"
ZSH_THEME_GIT_PROMPT_SUFFIX="%{$reset_color%}"
ZSH_THEME_GIT_PROMPT_DIRTY="%{$fg[red]%}⚡%{$reset_color%}"
ZSH_THEME_GIT_PROMPT_AHEAD="%{%F{red}%}!%{$reset_color%}"
ZSH_THEME_GIT_PROMPT_CLEAN="%{%F{green}%} ✓%{$reset_color%}"

ZSH_THEME_GIT_PROMPT_ADDED="%{$fg[green]%} ✚"
ZSH_THEME_GIT_PROMPT_MODIFIED="%{$fg[blue]%} ✹"
ZSH_THEME_GIT_PROMPT_DELETED="%{$fg[red]%} ✖"
ZSH_THEME_GIT_PROMPT_RENAMED="%{$fg[magenta]%} ➜"
ZSH_THEME_GIT_PROMPT_UNMERGED="%{$fg[yellow]%} ═"
ZSH_THEME_GIT_PROMPT_UNTRACKED="%{$fg[cyan]%} ✭"

PROMPT='$ret_status %{%F{magenta}%}$(get_pwd)%{%f%k%b%} $(git_prompt_short_sha)$(git_prompt_info)
$(_prompt_char) '
RPROMPT='${return_status}$(git_time_since_commit)$(git_prompt_status)%{$reset_color%}'