Exemplo: "username in ~/Projects/projectname on master ± [17:08:02] at machinename"

.zshrc

# ZSH
  ZSH=$HOME/.oh-my-zsh

# PLUGIN
  plugins=(git)

# SOURCE
  source $ZSH/oh-my-zsh.sh

# PROMPT
  reset="%{$reset_color%}"
  function prompt_collapse_pwd {
    echo $(pwd | sed -e "s,^$HOME,~,")
  }
  function prompt_char {
    git branch >/dev/null 2>/dev/null && echo '±' && return
    hg root >/dev/null 2>/dev/null && echo '☿' && return
    echo 'o'
  }

  PROMPT='%{$fg[cyan]%}%n%{$reset_color%} in %{$fg_bold[green]%}$(prompt_collapse_pwd)$reset on $(git_prompt_info) $(prompt_char) '
  RPROMPT='%{$fg_bold[green]%}[$(date +%H:%M:%S)]$reset at %{$fg[yellow]%}%m$reset'

# THEME
  ZSH_THEME="robbyrussell"
  ZSH_THEME_GIT_PROMPT_PREFIX="%{$fg[magenta]%}"
  ZSH_THEME_GIT_PROMPT_SUFFIX="$reset"
  ZSH_THEME_GIT_PROMPT_DIRTY="%{$fg[cyan]%}!"
  ZSH_THEME_GIT_PROMPT_CLEAN=""

# EXPORT
  export PATH=$PATH:/usr/local/sbin
  export PATH=$PATH:/usr/local/bin
  export PATH=$PATH:/usr/sbin
  export PATH=$PATH:/usr/bin
  export PATH=$PATH:/sbin
  export PATH=$PATH:/bin

# ALIAS
  alias p="cd ~/Projects"