Zsh prompt with git status

chpwd_update_git_vars.sh

update_current_git_vars

precmd_update_git_vars.sh

if [ -n "$__EXECUTED_GIT_COMMAND" ]; then
	update_current_git_vars
	unset __EXECUTED_GIT_COMMAND
fi

preexec_update_git_vars.sh

case "$1" in 
	git*)
	__EXECUTED_GIT_COMMAND=1
	;;
esac

prompt_git_info.sh

if [ -n "$__CURRENT_GIT_BRANCH" ]; then
	local s="("
	s+="$__CURRENT_GIT_BRANCH"
	case "$__CURRENT_GIT_BRANCH_STATUS" in
		ahead)
		s+="↑"
		;;
		diverged)
		s+="↕"
		;;
		behind)
		s+="↓"
		;;
	esac
	if [ -n "$__CURRENT_GIT_BRANCH_IS_DIRTY" ]; then
		s+="⚡"
	fi
	s+=")"
 
	printf " %s%s" "%{${fg[yellow]}%}" $s
fi

update_current_git_vars.sh

unset __CURRENT_GIT_BRANCH
unset __CURRENT_GIT_BRANCH_STATUS
unset __CURRENT_GIT_BRANCH_IS_DIRTY
local st="$(git status 2>/dev/null)"
if [ -n "$st" ]; then
	local -a arr
	arr=(${(f)st})
	if echo $arr[1] | grep "Not currently on any branch." >/dev/null; then
		__CURRENT_GIT_BRANCH='no-branch'
	else
		__CURRENT_GIT_BRANCH="$(echo $arr[1] | awk ' { print $4 } ')"
	fi
	if echo $arr[2] | grep "Your branch is" >/dev/null; then
		if echo $arr[2] | grep "ahead" >/dev/null; then
			__CURRENT_GIT_BRANCH_STATUS='ahead'
		elif echo $arr[2] | grep "diverged" >/dev/null; then
			__CURRENT_GIT_BRANCH_STATUS='diverged'
		else
			__CURRENT_GIT_BRANCH_STATUS='behind'
		fi
	fi
	if echo $st | grep "nothing to commit (working directory clean)" >/dev/null; then
	else
		__CURRENT_GIT_BRANCH_IS_DIRTY='1'
	fi
fi

zshrc.sh

# Initialize colors.
autoload -U colors
colors
 
# Allow for functions in the prompt.
setopt PROMPT_SUBST
 
# Autoload zsh functions.
fpath=(~/.zsh/functions $fpath)
autoload -U ~/.zsh/functions/*(:t)
 
# Enable auto-execution of functions.
typeset -ga preexec_functions
typeset -ga precmd_functions
typeset -ga chpwd_functions
 
# Append git functions needed for prompt.
preexec_functions+='preexec_update_git_vars'
precmd_functions+='precmd_update_git_vars'
chpwd_functions+='chpwd_update_git_vars'
 
# Set the prompt.
PROMPT=$'%{${fg[blue]}%}%B%1.%b$(prompt_git_info)%{${fg[default]}%} '