My bash prompts: short, long, and git status

.bash_prompts.sh

# My bash prompts. To use, source the code below and call the name of the function, e.g. "shortprompt".

# Display smiley indicator for return values, date, and truncated path, e.g.:
### igal@avijja:z #13 12:37 :)
shortprompt() {
    export PS1="\u@\h:\W #\! \A \`if [ \$? == 0 ]; then echo \:\); else echo \:\(; fi\` "
}

# Display shortprompt, but with non-truncated path, e.g.:
### igal@murad:~/mtmp/rubyfix #17 23:40 :) 
longprompt() {
    export PS1="\u@\h:\w #\! \A \`if [ \$? == 0 ]; then echo \:\); else echo \:\(; fi\` "
}

# Display git branch information, e.g.:
### openconferenceware::master :) 
gitprompt() { 
    # Extract git branch information
    function parse_git_branch {
        ref=$(git symbolic-ref HEAD 2> /dev/null) || return
        echo ${ref#refs/heads/}
    }

    # Define shell prompt
    export PS1="\W::\`parse_git_branch\` \`if [ \$? == 0 ]; then echo \:\); else echo \:\(; fi\` "
}