_ssh() {
    local cur opts
    COMPREPLY=()
    cur="${COMP_WORDS[COMP_CWORD]}"
    opts=$(grep '^Host' ~/.ssh/config ~/.ssh/config.d/* 2>/dev/null | grep -v '[?*]' | cut -d ' ' -f 2-)
    COMPREPLY=( $(compgen -W "$opts" -- ${cur}) )
    return 0
}

_bkp() {
    local cur opts
    COMPREPLY=()
    cur="${COMP_WORDS[COMP_CWORD]}"
    opts=$(ls ~/.backup/1)
    COMPREPLY=( $(compgen -W "$opts" -- ${cur}) )
    return 0
}

_workon() {
    local cur prev envs
    COMPREPLY=()
    cur="${COMP_WORDS[COMP_CWORD]}"
    prev="${COMP_WORDS[COMP_CWORD-1]}"
    envs=$(ls /opt/pythonenv/)

    COMPREPLY=( $(compgen -W "${envs}" -- ${cur}) )
}

complete -F _workon workon
complete -F _ssh ssh
complete -F _ssh sftp
complete -F _bkp bkp