_website_newdoc() {
    local dir='src'
    local excl='[._]*'
    if [[ "$COMP_CWORD" -gt 1 ]]; then
        dir="${dir}/tags"
    else
        excl="@(${excl}|tags)"
    fi
    pushd "$dir" >/dev/null
    COMPREPLY=($(compgen -o filenames -o nospace -d -X "$excl" -- "${COMP_WORDS[COMP_CWORD]}" | sed 's,$,/,'))
    popd >/dev/null
}

_website_newtag() {
    false
}

complete -o filenames -o nospace -F _website_newdoc ./new-doc
complete -o filenames -o nospace -F _website_newtag ./new-tag