Powerline style prompt for Bash (and now, ZSH)

A Powerline like prompt for Bash/ZSH:

Shows some important details about the git branch:
- Displays the current git branch which changes background color when the branch is dirty
- A '+' appears when untracked files are present
- When the local branch differs from the remote, the difference in number of commits is shown along with '⇡' or '⇣' indicating whether a git push or pull is pending
Changes color if the last command exited with a failure code
If you're too deep into a directory tree, shortens the displayed path with an ellipsis
Shows the current Python virtualenv environment
It's all done in a Python script, so you could go nuts with it

Setup

This script uses ANSI color codes to display colors in a terminal. These are notoriously non-portable, so may not work for you out of the box, but try setting your $TERM to xterm-256color, because that works for me.
Patch the font you use for your terminal: see https://github.com/Lokaltog/vim-powerline/wiki/Patched-fonts

Clone this repository somewhere:

  git clone https://github.com/milkbikis/powerline-shell

Create a symlink to the python script in your home:
```
  ln -s <path/to/powerline-shell.py> ~/powerline-shell.py
```
If you don't want the symlink, just modify the path in the commands below

Now add the following to your .bashrc:

  function _update_ps1() {
     export PS1="$(~/powerline-shell.py $?)"
  }

  export PROMPT_COMMAND="_update_ps1"

ZSH fans, add the following to your .zshrc:

  function powerline_precmd() {
    export PS1="$(~/powerline-shell.py $? --shell zsh)"
  }

  function install_powerline_precmd() {
    for s in "${precmd_functions[@]}"; do
      if [ "$s" = "powerline_precmd" ]; then
        return
      fi
    done
    precmd_functions+=(powerline_precmd)
  }

  install_powerline_precmd

Fish users, redefine fish_prompt in ~/.config/fish/config.fish:

  function fish_prompt
      ~/powerline-shell.py $status --shell bare
  end

caetanus/powerline-shell

Powerline style prompt for Bash (and now, ZSH)

Setup