Show git branch on bash prompt

.bashrc

# Show git branch name
force_color_prompt=yes
color_prompt=yes
# Add git branch if its present to PS1
parse_git_branch() {
 git branch 2> /dev/null | sed -e '/^[^*]/d' -e 's/* \(.*\)/(\1)/'
}
if [ "$color_prompt" = yes ]; then
 PS1='${debian_chroot:+($debian_chroot)}\[\033[01;32m\]\u@\h\[\033[00m\]:\[\033[01;34m\]\w\[\033[01;31m\]$(parse_git_branch)\[\033[00m\]\$ '
else
 PS1='${debian_chroot:+($debian_chroot)}\u@\h:\w$(parse_git_branch)\$ '
fi

.bashrc_powerline_version

# execute on console
#
sudo apt-get install python-pip
sudo pip install powerline-shell

.bashrc
function _update_ps1() {
    PS1="$(powerline-shell $?)"
}

if [ "$TERM" != "linux" ]; then
    PROMPT_COMMAND="_update_ps1; $PROMPT_COMMAND"
fi