Zsh battery reporting for Ubuntu

batteryMeter.rb

# encoding: utf-8

# Get the current battery status percentage.
battery_status = `acpi`
charge = battery_status.match(/\d*%/)[0].chop.to_i

# Calculate the number of charged slots.
total_slots = 10

filled = "▸" * (charge/total_slots).ceil
empty = "▹" * (total_slots - filled.length)
output = filled + empty


# Colors
color_green = '%{%}'
color_yellow = '%{%}'
color_red = '%{%}'
color_reset = '%{%}'

color_out = case
  when filled.length > 6
    color_green
  when filled.length > 4
    color_yellow
  else
    color_red
end

# Return the charge.
puts color_out + output + color_reset

gistfile1.bat

# Based off http://stevelosh.com/blog/2010/02/my-extravagant-zsh-prompt/
function collapse_pwd {
    echo $(pwd | sed -e "s,^$HOME,~,")
}

function prompt_char {
    git branch >/dev/null 2>/dev/null && echo '±' && return
    echo '○'
}

function battery_charge {
    #echo `acpi | grep ...% -o` 2>/dev/null
    echo `/home/seich/.rvm/rubies/ruby-1.9.2-p290/bin/ruby /home/seich/.bin/batteryMeter.rb` 2>/dev/null
}

function virtualenv_info {
    [ $VIRTUAL_ENV ] && echo '('`basename $VIRTUAL_ENV`') '
}

PROMPT='
%{$fg[magenta]%}%n%{$reset_color%} at %{$fg[yellow]%}%m%{$reset_color%} in %{$fg_bold[green]%}$(collapse_pwd)%{$reset_color%}$(git_prompt_info)
$(virtualenv_info)$(prompt_char) '

RPROMPT='$(battery_charge)'

ZSH_THEME_GIT_PROMPT_PREFIX=" on %{$fg[magenta]%}"
ZSH_THEME_GIT_PROMPT_SUFFIX="%{$reset_color%}"
ZSH_THEME_GIT_PROMPT_DIRTY="%{$fg[green]%}!"
ZSH_THEME_GIT_PROMPT_UNTRACKED="%{$fg[green]%}?"
ZSH_THEME_GIT_PROMPT_CLEAN=""