[root@localhost bash_completion.d]# cat docker-machine.bash 
#
# bash completion file for docker-machine commands
#
# This script provides completion of:
#  - commands and their options
#  - machine names
#  - filepaths
#
# To enable the completions either:
#  - place this file in /etc/bash_completion.d
#  or
#  - copy this file to e.g. ~/.docker-machine-completion.sh and add the line
#    below to your .bashrc after bash completion features are loaded
#    . ~/.docker-machine-completion.sh
#

# --- helper functions -------------------------------------------------------

_docker_machine_q() {
    docker-machine 2>/dev/null "$@"
}

# suppresses trailing whitespace
_docker_machine_nospace() {
    # compopt is not available in ancient bash versions (OSX)
    # so only call it if it‘s available
    type compopt &>/dev/null && compopt -o nospace
}

_docker_machine_machines() {
    _docker_machine_q ls --format ‘{{.Name}}‘ "$@"
}

_docker_machine_drivers() {
    local drivers=(
        amazonec2
        azure
        digitalocean
        exoscale
        generic
        google
        hyperv
        openstack
        rackspace
        softlayer
        virtualbox
        vmwarefusion
        vmwarevcloudair
        vmwarevsphere
    )
    echo "${drivers[@]}"
}

_docker_machine_value_of_option() {
    local pattern="$1"
    for (( i=2; i < ${cword}; ++i)); do
        if [[ ${words[$i]} =~ ^($pattern)$ ]] ; then
            echo ${words[$i + 1]}
            break
        fi
    done
}

# Returns `key` if we are currently completing the value of a map option
# (`key=value`) which matches the glob passed in as an argument.
# This function is needed for key-specific argument completions.
_docker_machine_map_key_of_current_option() {
    local glob="$1"

    local key glob_pos
    if [ "$cur" = "=" ] ; then        # key= case
            key="$prev"
            glob_pos=$((cword - 2))
    elif [[ $cur == *=* ]] ; then     # key=value case (OSX)
            key=${cur%=*}
            glob_pos=$((cword - 1))
    elif [ "$prev" = "=" ] ; then
            key=${words[$cword - 2]}  # key=value case
            glob_pos=$((cword - 3))
    else
            return
    fi

    [ "${words[$glob_pos]}" = "=" ] && ((glob_pos--))  # --option=key=value syntax

    [[ ${words[$glob_pos]} == $glob ]] && echo "$key"
}

# Finds the position of the first word that is neither option nor an option‘s argument.
# If there are options that require arguments, you need to pass a glob describing
# those options, e.g. "--option1|-o|--option2".
# Use this function to restrict completions to exact positions after the options.
_docker_machine_pos_first_nonflag() {
    local argument_flags=$1

    local counter=$((${subcommand_pos:-${command_pos}} + 1))
    while [ "$counter" -le "$cword" ]; do
       if [ -n "$argument_flags" ] && eval "case ‘${words[$counter]}‘ in $argument_flags) true ;; *) false ;; esac"; then
          (( counter++ ))
          # eat "=" in case of --option=arg syntax
          [ "${words[$counter]}" = "=" ] && (( counter++ ))
       else
          case "${words[$counter]}" in
             -*)
                 ;;
             *)
                 break
                 ;;
          esac
       fi

       # Bash splits words at "=", retaining "=" as a word, examples:
       # "--debug=false" => 3 words, "--log-opt syslog-facility=daemon" => 4 words
       while [ "${words[$counter + 1]}" = "=" ] ; do
               counter=$(( counter + 2))
       done

       (( counter++ ))
    done

    echo $counter
}
# --- completion functions ---------------------------------------------------

_docker_machine_active() {
    case "${prev}" in
        --timeout|-t)
            return
            ;;
    esac

    if [[ "${cur}" == -* ]]; then
        COMPREPLY=($(compgen -W "--help --timeout -t" -- "${cur}"))
    fi
}

_docker_machine_config() {
    if [[ "${cur}" == -* ]]; then
        COMPREPLY=($(compgen -W "--help --swarm" -- "${cur}"))
    else
        COMPREPLY=($(compgen -W "$(_docker_machine_machines)" -- "${cur}"))
    fi
}

_docker_machine_create() {
    case "${prev}" in
        --driver|-d)
            COMPREPLY=($(compgen -W "$(_docker_machine_drivers)" -- "${cur}"))
            return
            ;;
    esac

    # driver specific options are only included in help output if --driver is given,
    # so we have to pass that option when calling docker-machine to harvest options.
    local driver="$(_docker_machine_value_of_option ‘--driver|-d‘)"
    local parsed_options="$(_docker_machine_q create ${driver:+--driver $driver} --help | grep ‘^   -‘ | sed ‘s/^   //; s/[^a-z0-9-].*$//‘)"
    if [[ ${cur} == -* ]]; then
        COMPREPLY=($(compgen -W "${parsed_options} -d --help" -- "${cur}"))
    fi
}

_docker_machine_env() {
    case "${prev}" in
        --shell)
            COMPREPLY=($(compgen -W "cmd emacs fish powershell tcsh" -- "${cur}"))
            return
            ;;
    esac

    if [[ "${cur}" == -* ]]; then
        COMPREPLY=($(compgen -W "--help --no-proxy --shell --swarm --unset -u" -- "${cur}"))
    else
        COMPREPLY=($(compgen -W "$(_docker_machine_machines)" -- "${cur}"))
    fi
}

# See docker-machine-wrapper.bash for the use command
_docker_machine_use() {
    if [[ "${cur}" == -* ]]; then
        COMPREPLY=($(compgen -W "--help --swarm --unset" -- "${cur}"))
    else
        COMPREPLY=($(compgen -W "$(_docker_machine_machines)" -- "${cur}"))
    fi
}

_docker_machine_inspect() {
    case "${prev}" in
        --format|-f)
            return
            ;;
    esac

    if [[ "${cur}" == -* ]]; then
        COMPREPLY=($(compgen -W "--format -f --help" -- "${cur}"))
    else
        COMPREPLY=($(compgen -W "$(_docker_machine_machines)" -- "${cur}"))
    fi
}

_docker_machine_ip() {
    if [[ "${cur}" == -* ]]; then
        COMPREPLY=($(compgen -W "--help" -- "${cur}"))
    else
        COMPREPLY=($(compgen -W "$(_docker_machine_machines)" -- "${cur}"))
    fi
}

_docker_machine_kill() {
    if [[ "${cur}" == -* ]]; then
        COMPREPLY=($(compgen -W "--help" -- "${cur}"))
    else
        COMPREPLY=($(compgen -W "$(_docker_machine_machines)" -- "${cur}"))
    fi
}

_docker_machine_ls() {
    local key=$(_docker_machine_map_key_of_current_option ‘--filter‘)
    case "$key" in
        driver)
            COMPREPLY=($(compgen -W "$(_docker_machine_drivers)" -- "${cur##*=}"))
            return
            ;;
        state)
            COMPREPLY=($(compgen -W "Error Paused Running Saved Starting Stopped Stopping" -- "${cur##*=}"))
            return
            ;;
    esac

    case "${prev}" in
        --filter)
            COMPREPLY=($(compgen -W "driver label name state swarm" -S= -- "${cur}"))
            _docker_machine_nospace
            return
            ;;
        --format|-f|--timeout|-t)
            return
            ;;
    esac

    if [[ "${cur}" == -* ]]; then
        COMPREPLY=($(compgen -W "--filter --format -f --help --quiet -q --timeout -t" -- "${cur}"))
    fi
}

_docker_machine_mount() {
    if [[ "${cur}" == -* ]]; then
        COMPREPLY=($(compgen -W "--help --unmount -u" -- "${cur}"))
    else
        local pos=$(_docker_machine_pos_first_nonflag)
        if [ "$cword" -eq "$pos" ]; then
            # We can‘t complete remote filesystems. All we can do here is to complete the machine.
            COMPREPLY=($(compgen -W "$(_docker_machine_machines --filter state=Running)" -S: -- "${cur}"))
            _docker_machine_nospace
        elif [ "$cword" -eq "$((pos + 1))" ]; then
           _filedir -d
        fi
    fi
}

_docker_machine_provision() {
    if [[ "${cur}" == -* ]]; then
        COMPREPLY=($(compgen -W "--help" -- "${cur}"))
    else
        COMPREPLY=($(compgen -W "$(_docker_machine_machines --filter state=Running)" -- "${cur}"))
    fi
}

_docker_machine_regenerate_certs() {
    if [[ "${cur}" == -* ]]; then
        COMPREPLY=($(compgen -W "--client-certs --force -f --help" -- "${cur}"))
    else
        COMPREPLY=($(compgen -W "$(_docker_machine_machines --filter state=Running)" -- "${cur}"))
    fi
}

_docker_machine_restart() {
    if [[ "${cur}" == -* ]]; then
        COMPREPLY=($(compgen -W "--help" -- "${cur}"))
    else
        COMPREPLY=($(compgen -W "$(_docker_machine_machines)" -- "${cur}"))
    fi
}

_docker_machine_rm() {
    if [[ "${cur}" == -* ]]; then
        COMPREPLY=($(compgen -W "--force -f --help -y" -- "${cur}"))
    else
        COMPREPLY=($(compgen -W "$(_docker_machine_machines)" -- "${cur}"))
    fi
}

_docker_machine_ssh() {
    if [[ "${cur}" == -* ]]; then
        COMPREPLY=($(compgen -W "--help" -- "${cur}"))
    else
        COMPREPLY=($(compgen -W "$(_docker_machine_machines)" -- "${cur}"))
    fi
}

_docker_machine_scp() {
    if [[ "${cur}" == -* ]]; then
        COMPREPLY=($(compgen -W "--delta -d --help --quiet -q --recursive -r" -- "${cur}"))
    else
        _filedir
        # It would be really nice to ssh to the machine and ls to complete
        # remote files.
        COMPREPLY=($(compgen -W "$(_docker_machine_machines | sed ‘s/$/:/‘)" -- "${cur}") "${COMPREPLY[@]}")
    fi
}

_docker_machine_start() {
    if [[ "${cur}" == -* ]]; then
        COMPREPLY=($(compgen -W "--help" -- "${cur}"))
    else
        COMPREPLY=($(compgen -W "$(_docker_machine_machines --filter state=Stopped)" -- "${cur}"))
    fi
}

_docker_machine_status() {
    if [[ "${cur}" == -* ]]; then
        COMPREPLY=($(compgen -W "--help" -- "${cur}"))
    else
        COMPREPLY=($(compgen -W "$(_docker_machine_machines)" -- "${cur}"))
    fi
}

_docker_machine_stop() {
    if [[ "${cur}" == -* ]]; then
        COMPREPLY=($(compgen -W "--help" -- "${cur}"))
    else
        COMPREPLY=($(compgen -W "$(_docker_machine_machines --filter state=Running)" -- "${cur}"))
    fi
}

_docker_machine_upgrade() {
    if [[ "${cur}" == -* ]]; then
        COMPREPLY=($(compgen -W "--help" -- "${cur}"))
    else
        COMPREPLY=($(compgen -W "$(_docker_machine_machines)" -- "${cur}"))
    fi
}

_docker_machine_url() {
    if [[ "${cur}" == -* ]]; then
        COMPREPLY=($(compgen -W "--help" -- "${cur}"))
    else
        COMPREPLY=($(compgen -W "$(_docker_machine_machines)" -- "${cur}"))
    fi
}

_docker_machine_version() {
    if [[ "${cur}" == -* ]]; then
        COMPREPLY=($(compgen -W "--help" -- "${cur}"))
    else
        COMPREPLY=($(compgen -W "$(_docker_machine_machines)" -- "${cur}"))
    fi
}

_docker_machine_help() {
    if [[ "${cur}" == -* ]]; then
        COMPREPLY=($(compgen -W "--help" -- "${cur}"))
    else
        COMPREPLY=($(compgen -W "${commands[*]}" -- "${cur}"))
    fi
}

_docker_machine_docker_machine() {
    if [[ " ${wants_file[*]} " =~ " ${prev} " ]]; then
        _filedir
    elif [[ " ${wants_dir[*]} " =~ " ${prev} " ]]; then
        _filedir -d
    elif [[ "${cur}" == -* ]]; then
        COMPREPLY=($(compgen -W "${flags[*]} ${wants_dir[*]} ${wants_file[*]}" -- "${cur}"))
    else
        COMPREPLY=($(compgen -W "${commands[*]}" -- "${cur}"))
    fi
}

_docker_machine() {
    COMPREPLY=()
    local commands=(active config create env inspect ip kill ls mount provision regenerate-certs restart rm ssh scp start status stop upgrade url version help)

    local flags=(--debug --native-ssh --github-api-token --bugsnag-api-token --help --version)
    local wants_dir=(--storage-path)
    local wants_file=(--tls-ca-cert --tls-ca-key --tls-client-cert --tls-client-key)

    # Add the use subcommand, if we have an alias loaded
    if [[ ${DOCKER_MACHINE_WRAPPED} = true ]]; then
        commands=("${commands[@]}" use)
    fi

    local cur prev words cword
    _get_comp_words_by_ref -n : cur prev words cword
    local i
    local command=docker-machine command_pos=0

    for (( i=1; i < ${cword}; ++i)); do
        local word=${words[i]}
        if [[ " ${wants_file[*]} ${wants_dir[*]} " =~ " ${word} " ]]; then
            # skip the next option
            (( ++i ))
        elif [[ " ${commands[*]} " =~ " ${word} " ]]; then
            command=${word}
            command_pos=$i
        fi
    done

    local completion_func=_docker_machine_"${command//-/_}"
    if declare -F "${completion_func}" > /dev/null; then
        ${completion_func}
    fi

    return 0
}

complete -F _docker_machine docker-machine docker-machine.exe

[root@localhost bash_completion.d]# cat docker-machine-wrapper.bash 
#
# Function wrapper to docker-machine that adds a use subcommand.
#
# The use subcommand runs `eval "$(docker-machine env [args])"`, which is a lot
# less typing.
#
# To enable:
#  1a. Copy this file somewhere and source it in your .bashrc
#      source /some/where/docker-machine-wrapper.bash
#  1b. Alternatively, just copy this file into into /etc/bash_completion.d
#
# Configuration:
#
# DOCKER_MACHINE_WRAPPED
#   When set to a value other than true, this will disable the alias wrapper
#   alias for docker-machine. This is useful if you don‘t want the wrapper,
#   but it is installed by default by your installation.
#

: ${DOCKER_MACHINE_WRAPPED:=true}

__docker_machine_wrapper () {
    if [[ "$1" == use ]]; then
        # Special use wrapper
        shift 1
        case "$1" in
            -h|--help|"")
                cat <<EOF
Usage: docker-machine use [OPTIONS] [arg...]
Evaluate the commands to set up the environment for the Docker client
Description:
   Argument is a machine name.
Options:
   --swarm      Display the Swarm config instead of the Docker daemon
   --unset, -u  Unset variables instead of setting them
EOF
                ;;
            *)
                eval "$(docker-machine env "$@")"
                echo "Active machine: ${DOCKER_MACHINE_NAME}"
                ;;
        esac
    else
        # Just call the actual docker-machine app
        command docker-machine "$@"
    fi
}

if [[ ${DOCKER_MACHINE_WRAPPED} = true ]]; then
    alias docker-machine=__docker_machine_wrapper
fi