bash-prompt.sh

# My bash prompt. Displays the currently checked out git 
# branch and the exit status of the last command.
#
# This is adapted from various sources, including colors
# from Lifehacker and exit status and git branch indicators 
# from Igal Koshevoy <http://gist.github.com/109520>.
#
# To use copy and paste this code into your .bashrc file.

function prompt {
    local WHITE="\[\033[1;37m\]"
    local CYAN="\[\033[0;36m\]"
    local GRAY="\[\033[0;37m\]"
    local GREEN="\[\e[1;32m\]"
    local BLUE="\[\e[1;34m\]"
    local BLACK="\[\e[0m\]"

    function git_branch {
        ref=$(git symbolic-ref HEAD 2> /dev/null) || return 0
        echo " ${ref#refs/heads/}"
    }

    # Displays a frowning face if any commands in a pipe expression fail.
    # For example, foo | bar | grep nao
    #
    # Displays a smiling face if all commands ran successfully.
    function exit_status_indicator {
        for stat in ${PIPESTATUS[*]}
        do
            stat_sum=$(($stat_sum + $stat))
        done

        if [ $stat_sum == 0 ]
        then
            echo ':)'
        else
            echo ':('
        fi
    }

    export PS1="${debian_chroot:+($debian_chroot)}${GREEN}\u@\h ${BLUE}\W${CYAN}\$(git_branch) ${BLUE}\$(exit_status_indicator) ${BLACK}"
}
prompt