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setopt prompt_subst
autoload colors
colors
autoload -Uz vcs_info

for COLOR in RED GREEN BLUE YELLOW WHITE BLACK CYAN; do
    eval PR_$COLOR='%{$fg[${(L)COLOR}]%}'
    eval PR_BRIGHT_$COLOR='%{$fg_bold[${(L)COLOR}]%}'
done
PR_RESET="%{%b%s%u$reset_color%}"

typeset -ga preexec_functions
typeset -ga precmd_functions
typeset -ga chpwd_functions

precmd_functions+='update_prompt'
preexec_functions+='on_preexec_git_update'
chpwd_functions+='update_prompt'

function on_preexec_git_update {
  case "$1" in 
    git*)
      update_prompt
    ;;
  esac
}

function make_prompt {
  local c_time=$PR_BRIGHT_CYAN
  local c_user=$1
  local c_host=$2
  local c_path=$PR_GREEN
  local c_git=$PR_YELLOW
  local c_virtualenv=$PR_BRIGHT_BLACK
  local c_sep=$PR_BRIGHT_YELLOW
  local c_r=$PR_RESET
  
  local time="${c_time}%T${c_r}"
  local user="${c_user}%n${c_r}"
  local at="${c_sep}@${c_r}"
  local host="${c_host}%m${c_r}"
  local cwd="${c_path}%B%~%b${c_r}"
  local git="${c_git}$GIT_BRANCH${c_r}"
  local invite="${c_sep}%#${c_r}"
  
  if [ -z ${VIRTUAL_ENV+x} ]; then
    local virtualenv=""
  else
    local virtualenv=" ${c_virtualenv}[$(basename $VIRTUAL_ENV)]${c_r}"
  fi
  
  PROMPT="${time} ${user}${at}${host} ${cwd}${virtualenv}${git}${invite} "
}

function update_prompt {
  GIT_BRANCH=`git branch --no-color 2> /dev/null | sed -e '/^[^*]/d' -e 's/* \(.*\)/ (\1)/'`
  if [ "`id -u`" -eq 0 ]; then
    make_prompt $PR_BRIGHT_BLUE $PR_BRIGHT_WHITE
  else
    make_prompt $PR_BRIGHT_RED $PR_BRIGHT_WHITE
  fi
}

update_prompt