My git prompt is better than any other one I've seen anywhere.

bash.sh

# prompt
function _git_prompt() {
    local git_status="`git status -unormal 2>&1`"
    if ! [[ "$git_status" =~ Not\ a\ git\ repo ]]; then
        if [[ "$git_status" =~ Changed\ but\ not\ updated ]] || [[ "$git_status" =~ Untracked\ files ]] || [[ "$git_status" =~ Changes\ not\ staged ]] || [[ "$git_status" =~ Unmerged\ paths ]]; then
            local color="0;31" # red
        elif [[ "$git_status" =~ Changes\ to\ be\ committed ]]; then
            local color="0;32"
        else
            local color="1;32"
        fi
        echo -n '\[\033['$color'm\]$(__git_ps1)\[\033[0m\]'
    fi
}

function _prompt_command() {
    PS1='\w'"`_git_prompt`"'\$\[\e[0m\] ';fi;
}

PROMPT_COMMAND=_prompt_command

zsh.sh

# vcs_info for prompt
autoload -Uz vcs_info
zstyle ':vcs_info:*' enable git
zstyle ':vcs_info:git*' check-for-changes true
zstyle ':vcs_info:git*' use-prompt-escapes true
zstyle ':vcs_info:git*' stagedstr "%{$fg_no_bold[green]%}"
zstyle ':vcs_info:git*' unstagedstr "%{$fg_no_bold[red]%}"

precmd() {
  if [[ -z $(git ls-files --other --exclude-standard -- $(git rev-parse --show-cdup 2>/dev/null) 2>/dev/null) ]] {
    untracked=''
  } else {
    untracked="%{$fg_no_bold[red]%}"
  }
  zstyle ':vcs_info:git*' formats "%{$fg_bold[green]%}%c%u$untracked(%b)%{$reset_color%}"
  zstyle ':vcs_info:git*' actionformats "%{$fg_bold[green]%}%c%u$untracked(%a|%b)%{$reset_color%}"
  vcs_info
}
setopt prompt_subst

# Prompt
PROMPT='%~ ${vcs_info_msg_0_}$ '
RPROMPT='$(vi_mode_prompt_info) %{$fg_bold[green]%}$(~/.rvm/bin/rvm-prompt)'