git branch on bash prompt and terminal tab/window title bar

.git_bash_profile

get_dir() {
    printf "%s" $(pwd | sed "s:$HOME:~:")
}   

rename_tab() {
    echo -ne "\033]0;"$@"\007"
}

rename_tab_git_branch() {
    branch=`git symbolic-ref HEAD 2>/dev/null | cut -d/ -f3`
    if [ "$branch" != "" ]; then
        rename_tab $branch
    else
        rename_tab $(get_dir)
    fi
}

GIT_PS1_SHOWUPSTREAM="auto"
GIT_PS1_SHOWCOLORHINTS="yes"
source ~/.git-prompt.sh
source ~/.git-completion.sh
 
export PROMPT_COMMAND='__git_ps1 "\u@\h:\W" "\\\$ ";rename_tab_git_branch;'