My hacked up zsh prompt. Displays info on RVM, git, and battery (on MacBooks). Drop in ~/.oh-my-zsh/custom/themes/ and go

janky.zsh-theme

## janky theme
#
# based on https://github.com/robbyrussell/oh-my-zsh/blob/master/themes/blinks.zsh-theme
# certain things cribbed from https://github.com/robbyrussell/oh-my-zsh/blob/master/themes/agnoster.zsh-theme

function _battery_capacity {
  ioreg -n AppleSmartBattery -r | \
          awk '$1~/Capacity/{c[$1]=$3} END{OFMT="%.2f%%"; max=c["\"MaxCapacity\""]; print (max>0? 100*c["\"CurrentCapacity\""]/max: "")}'
}

function _battery_charging_char {
  ioreg -n AppleSmartBattery -r | \
          awk '$1~/ExternalConnected/{gsub("Yes", "+");gsub("No", "%%"); print substr($0, length, 1)}'
}

function _git_repo_status_char {
  setopt promptsubst
  autoload -Uz vcs_info

  zstyle ':vcs_info:*' enable git
  zstyle ':vcs_info:*' get-revision true
  zstyle ':vcs_info:*' check-for-changes true
  zstyle ':vcs_info:*' stagedstr '✚'
  zstyle ':vcs_info:git:*' unstagedstr '●'
  zstyle ':vcs_info:*' formats ' %u%c'
  zstyle ':vcs_info:*' actionformats '%u%c'
  vcs_info

  if [[ $vcs_info_msg_0_ == " " ]]; then
    echo -n ''
  else
    echo $vcs_info_msg_0_
  fi
}

function _prompt_char {
  prompt_segment $bkg fg "$(_git_repo_status_char; bold '>')"
}

#function _rvm_prompt {
#  ${HOME}/.rvm/bin/rvm-prompt
#}

function _ruby_version {

   #_rvm_prompt | sed -e 's/^ruby-//' | cut -s -d '-' -f1
}

function _ruby_gemset {
  echo -n "$(rbenv gemset active | awk '{ print $1 }')"
}

function _prompt_rbenv { 
  ## TODO: only show if not "system"
  echo -n "$(rbenv_prompt_info)@$(_ruby_gemset)"
}

#function _prompt_rvm {
#  local version=$(_ruby_version)
#  local gemset=$(_ruby_gemset)
#  if [[ ! -z $gemset  ]]; then
#    prompt_segment $bkg green "${version}@${gemset}"
#  fi
#}

# Context: user@hostname (who am I and where am I)
function _prompt_context {
  local user=`whoami`

  if [[ "$user" != "$DEFAULT_USER" || -n "$SSH_CLIENT" ]]; then
    _prompt_user; _prompt_at; _prompt_hostname
  else
    echo -n ''
  fi
}

function _cwd {
  prompt_segment $bkg yellow '%~'
}

function bold() {
  local text=$1
  echo -n "%B${text}%b"
}

function _prompt_user {
  prompt_segment $bkg green '%n'
}

function _prompt_at {
  # echo -n '%F{blue}@'
  prompt_segment $bkg blue '@'
}

function _prompt_hostname {
  prompt_segment $bkg cyan '%m'
}

function _prompt_battery {
  prompt_segment $bkg cyan "$(_battery_capacity)$(_battery_charging_char)"
}

function _prompt_git {
  prompt_segment $bkg green "$(git_prompt_info)"
}

function blank_line {
  echo -n '%{%f%k%b%}'
}

# function blurt() {
#   zparseopts b=bold u=underline t:=text
#   if [ $bold -eq '-b' ]; then
#     echo 'BOLD!!!'
#   done
# }

function prompt_segment {
  local bg fg
  [[ -n $1 ]] && bg="%K{$1}" || bg="%k"
  [[ -n $2 ]] && fg="%F{$2}" || fg="%f"
  if [[ $CURRENT_BG != 'NONE' && $1 != $CURRENT_BG ]]; then
    echo -n "%{%k%b%f%}%{$bg%F{$CURRENT_BG}%}$SEGMENT_SEPARATOR%{$fg%}"
  else
    echo -n "%{$bg%}%{$fg%}"
  fi
  CURRENT_BG=$1
  [[ -n $3 ]] && echo -n $3
}

# This theme works with both the "dark" and "light" variants of the
# Solarized color schema.  Set the SOLARIZED_THEME variable to one of
# these two values to choose.  If you don't specify, we'll assume you're
# using the "dark" variant.

case ${SOLARIZED_THEME:-dark} in
    light) bkg=white;;
    *)     bkg=black;;
esac

ZSH_THEME_GIT_PROMPT_PREFIX="%B%K{${bkg}%F{green} [%{%B%F{blue}%}"
ZSH_THEME_GIT_PROMPT_SUFFIX="%{%f%k%b%K{${bkg}}%B%F{green}%}]"
ZSH_THEME_GIT_PROMPT_DIRTY=" %{%F{red}%}*%{%f%k%b%}"
ZSH_THEME_GIT_PROMPT_CLEAN=""

PROMPT='$(blank_line)
$(_prompt_context)$(_cwd)$(git_prompt_info) $(_prompt_rbenv)%E%{%f%k%b%}
$(_prompt_char)%{%f%k%b%} '

RPROMPT=$(_prompt_battery)