my command prompt setup for Mac Rails develpment, it shows git information in prompt and change terminal name

.bash_ps1.sh

# http://brettterpstra.com/2009/11/17/my-new-favorite-bash-prompt/

# http://bytebaker.com/2012/01/09/show-git-information-in-your-prompt/

function git-dirty() {
st=$(git status 2>/dev/null | tail -n 1)
if [[ $st != "nothing to commit, working directory clean" ]]
then
echo "*"
fi
}

function git-branch-name()
{
echo $(git symbolic-ref HEAD 2>/dev/null | awk -F/ {'print $NF'})
}

function git-unpushed {
#brinfo=$(git branch -v | grep $(git-branch-name))
brinfo=$(git branch -v)
if [[ $brinfo =~ ("[ahead "([[:digit:]]*)) ]]
then
echo "(${BASH_REMATCH[2]})"
fi
}

function gitify {
status=$(git status 2>/dev/null)
if [[ $status == "" ]]
then
echo ""
else
echo \ $(git-branch-name)$(git-dirty)$(git-unpushed)
fi
}

# adding \[ and \] around all of your color sequences in your PS1 declaration
# http://stackoverflow.com/questions/706750/why-is-this-bash-prompt-acting-strangely-disappearing-and-how-do-i-fix-it-os-x
# https://wiki.archlinux.org/index.php/Color_Bash_Prompt

GREEN="\[\033[0;32m\]"
CYAN="\[\033[0;36m\]"
BCYAN="\[\033[1;36m\]"
BLUE="\[\033[0;34m\]"
GRAY="\[\033[0;37m\]"
DKGRAY="\[\033[1;30m\]"
WHITE="\[\033[1;37m\]"
RED="\[\033[0;31m\]"
LIGHT_RED="\[\033[1;31;40m\]"
MAGENTA="\[\033[1;35;40m\]"
LIME="\[\033[1;32;40m\]"
YELLOW="\[\033[0;33m\]"
YELLRED="\[\033[1;33;41m\]"
LIGHT_GRAY="\[\033[0;37m\]"
# return color to Terminal setting for text color
DEFAULT="\[\033[0;39m\]"
#PS1="$CYAN}\h${GREEN} \w${RED} \$(gitify)${GREEN} >${LIGHT_GRAY} "
#PS1="$CYAN\$(date +%H:%M) $GREEN\$(rvm-prompt v)$DEFAULT[$GREEN\w$RED\$(gitify)$DEFAULT]$DEFAULT\$ "
PS1="$CYAN\$(date +%H:%M:%S) $GREEN\$(rvm-prompt v)$DEFAULT[$GREEN\W$RED\$(gitify)$DEFAULT]$DEFAULT\$ "
# http://superuser.com/questions/223308/name-terminal-tabs
# http://hints.macworld.com/article.php?story=20060502160527780
# function settitle() { echo -ne "\033]0;$@\007"; }
# http://stackoverflow.com/questions/1371261/get-current-directory-name-without-full-path-in-bash-script
# This cd function is not compatible with RVM, so disable it for the time being.
# function cd() { command cd "$@"; settitle ${PWD##*/} $(gitify); }
function title() { echo -ne "\033]0;${PWD##*/} $(gitify)\007"; }