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  # prompt style and colors based on Steve Losh's Prose theme:
  # http://github.com/sjl/oh-my-zsh/blob/master/themes/prose.zsh-theme
  #
  # vcs_info modifications from Bart Trojanowski's zsh prompt:
  # http://www.jukie.net/bart/blog/pimping-out-zsh-prompt
  #
  # git untracked files modification from Brian Carper:
  # http://briancarper.net/blog/570/git-info-in-your-zsh-prompt
  
  function virtualenv_info {
      [ $VIRTUAL_ENV ] && echo '('`basename $VIRTUAL_ENV`') '
  }
  PR_GIT_UPDATE=1
  
  setopt prompt_subst
  
  autoload -U add-zsh-hook
  autoload -Uz vcs_info
  
  #use extended color pallete if available
  if [[ $TERM = *256color* || $TERM = *rxvt* ]]; then
      turquoise="%F{81}"
      orange="%F{166}"
      purple="%F{135}"
      hotpink="%F{161}"
      limegreen="%F{118}"
  else
      turquoise="$fg[cyan]"
      orange="$fg[yellow]"
      purple="$fg[magenta]"
      hotpink="$fg[red]"
      limegreen="$fg[green]"
  fi
  
  # enable VCS systems you use
  zstyle ':vcs_info:*' enable git svn
  
  # check-for-changes can be really slow.
  # you should disable it, if you work with large repositories
  zstyle ':vcs_info:*:prompt:*' check-for-changes true
  
  # set formats
  # %b - branchname
  # %u - unstagedstr (see below)
  # %c - stagedstr (see below)
  # %a - action (e.g. rebase-i)
  # %R - repository path
  # %S - path in the repository
  PR_RST="%{${reset_color}%}"
  FMT_BRANCH=" on %{$turquoise%}%b%u%c${PR_RST}"
  FMT_ACTION=" performing a %{$limegreen%}%a${PR_RST}"
  FMT_UNSTAGED="%{$orange%} ●"
  FMT_STAGED="%{$limegreen%} ●"
  
  zstyle ':vcs_info:*:prompt:*' unstagedstr   "${FMT_UNSTAGED}"
  zstyle ':vcs_info:*:prompt:*' stagedstr     "${FMT_STAGED}"
  zstyle ':vcs_info:*:prompt:*' actionformats "${FMT_BRANCH}${FMT_ACTION}"
  zstyle ':vcs_info:*:prompt:*' formats       "${FMT_BRANCH}"
  zstyle ':vcs_info:*:prompt:*' nvcsformats   ""
  
  
  function steeef_preexec {
      case "$(history $HISTCMD)" in
          *git*)
              PR_GIT_UPDATE=1
              ;;
          *svn*)
              PR_GIT_UPDATE=1
              ;;
      esac
  }
  add-zsh-hook preexec steeef_preexec
  
  function steeef_chpwd {
      PR_GIT_UPDATE=1
  }
  add-zsh-hook chpwd steeef_chpwd
  
  function steeef_precmd {
      if [[ -n "$PR_GIT_UPDATE" ]] ; then
          # check for untracked files or updated submodules, since vcs_info doesn't
          if [[ ! -z $(git ls-files --other --exclude-standard 2> /dev/null) ]]; then
              PR_GIT_UPDATE=1
              FMT_BRANCH="${PM_RST} on %{$turquoise%}%b%u%c%{$hotpink%} ●${PR_RST}"
          else
              FMT_BRANCH="${PM_RST} on %{$turquoise%}%b%u%c${PR_RST}"
          fi
          zstyle ':vcs_info:*:prompt:*' formats       "${FMT_BRANCH}"
  
          vcs_info 'prompt'
          PR_GIT_UPDATE=
      fi
  }
  add-zsh-hook precmd steeef_precmd
  
  PROMPT=$'%{$purple%}%n%{$reset_color%} in %{$limegreen%}%~%{$reset_color%}$(ruby_prompt_info " with%{$fg[red]%} " v g "%{$reset_color%}")$vcs_info_msg_0_%{$orange%} λ%{$reset_color%} '