http://www.otit.fi/~iiska/bash_prompt-20090115.png

.bashrc

# .bashrc
if [ -f /etc/bashrc ]; then
	. /etc/bashrc
fi
[ -z "$PS1" ] && return

# http://en.tldp.org/HOWTO/Bash-Prompt-HOWTO/x869.html
function prompt_command {
hostnam=$(hostname -s)
usernam=$(whoami)
#returnvalue=$(([ $? -eq 0 ] && echo "\[\033[0;32m\]"☺) || echo "\[\033[0;31m\]"☹)

#   Find the width of the prompt:
TERMWIDTH=${COLUMNS}

#   Add all the accessories below ...
local temp="--(${usernam}@${hostnam})(${PWD/#$HOME/~}$(parse_git_branch 1))--"

let fillsize=${TERMWIDTH}-${#temp}
if [ "$fillsize" -gt "0" ]
then
	fill="────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────"
	#   It's theoretically possible someone could need more
	#   dashes than above, but very unlikely!  HOWTO users,
	#   the above should be ONE LINE, it may not cut and
	#   paste properly
	fill="${fill:0:${fillsize}}"
fi
}

PROMPT_COMMAND=prompt_command

# http://henrik.nyh.se/2008/12/git-dirty-prompt
function parse_git_dirty {
    local ret
    if [ -z $1 ]; then
        ret="\033[1;31m*\033[1;37m"
    else
        ret="*"
    fi
  [[ $(git status 2> /dev/null | tail -n1) != "nothing to commit (working directory clean)" ]] && echo -e $ret
}
# http://www.simplisticcomplexity.com/2008/03/13/show-your-git-branch-name-in-your-prompt/
function parse_git_branch {
  ref=$(git-symbolic-ref HEAD 2> /dev/null) || return
  echo " : "${ref#refs/heads/}"$(parse_git_dirty $1)"
}
function create_prompt {
    local BLUE="\[\033[0;34m\]"
    local RED="\[\033[0;31m\]"
    local LIGHT_RED="\[\033[1;31m\]"
    local GREEN="\[\033[0;32m\]"
    local LIGHT_GREEN="\[\033[1;32m\]"
    local WHITE="\[\033[1;37m\]"
    local LIGHT_GRAY="\[\033[0;37m\]"

    echo "$LIGHT_GRAY┌─($WHITE\u@\h$LIGHT_GRAY)\${fill}($WHITE\w\$(parse_git_branch)$LIGHT_GRAY)─┈"
    echo "└─(\$(date +%H:%M)) $LIGHT_GRAY$ "
}
export PS1=$(create_prompt)

This is obsolete and inefficient way to parse current git branch. Recommended way is to use function __git_ps1 from git's bash completions. Like this:

export GIT_PS1_SHOWDIRTYSTATE=1
PS1='\u@\h:\w$(__git_ps1)\$ '