bash script for being too lazy to cd into sites directory (with autocompletion)

gistfile1.txt

_sites () {
    local client project
    COMPREPLY=()
    cur="${COMP_WORDS[COMP_CWORD]}"
    prev="${COMP_WORDS[COMP_CWORD-1]}"
    if [ $prev == "sites" ]
    then
        COMPREPLY=( $(compgen -W "$(ls /Users/alex/Sites/)" -- $cur) );
    else
        COMPREPLY=( $(compgen -W "$(ls "/Users/alex/Sites/$prev")" -- $cur));
    fi
}
complete -F _sites sites;

sites () {
    cd "/Users/alex/Sites/$1/$2"
}