MBP zsh prompt with GIT and battery status

default.zsh-theme

ZSH_THEME_GIT_PROMPT_PREFIX="[git:"
ZSH_THEME_GIT_PROMPT_SUFFIX="]$reset_color"
ZSH_THEME_GIT_PROMPT_DIRTY="$fg[red]+"
ZSH_THEME_GIT_PROMPT_CLEAN="$fg[green]"

function git_prompt_info() {
	ref=$(git symbolic-ref HEAD 2> /dev/null) || return
	echo "$(parse_git_dirty)$ZSH_THEME_GIT_PROMPT_PREFIX$(current_branch)$ZSH_THEME_GIT_PROMPT_SUFFIX"
}

function battery_charge() {
	if [ -e ~/SkyDrive/Config/batcharge.py ]
	then
		echo `python ~/SkyDrive/Config/batcharge.py`
	else
		echo ''
	fi
}

function get_pwd() {
	echo "${PWD/$HOME/~}"
}

function put_spacing() {
	local git=$(git_prompt_info)
	if [ ${#git} != 0 ]; then
		((git = ${#git} - 10))
	else
		git=0
	fi

	local bat=$(battery_charge)
	if [ ${#bat} != 0 ]; then
		((bat=${#bat} - 18))
	else
		bat=0
	fi

	local termwidth;
	((termwidth = ${COLUMNS} - 3 - ${#HOST} - ${#$(get_pwd)} - ${bat} - ${git}))

	local spacing=""
	for i in {1..$termwidth}; do
		spacing="${spacing} "
	done

	echo $spacing;
}

PROMPT='
$fg[cyan]%m: $fg[yellow]$(get_pwd)$(put_spacing)$(git_prompt_info) $(battery_charge)
$reset_color➜ '