systemd/shell-completion/bash/machinectl

# shellcheck shell=bash
# machinectl(1) completion                      -*- shell-script -*-
# SPDX-License-Identifier: LGPL-2.1-or-later
#
# This file is part of systemd.
#
# systemd is free software; you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation; either version 2.1 of the License, or
# (at your option) any later version.
#
# systemd is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with systemd; If not, see <https://www.gnu.org/licenses/>.

__contains_word() {
    local w word=$1; shift
    for w in "$@"; do
        [[ $w = "$word" ]] && return
    done
}

__get_machines() {
    local mode=$1; shift 1
    local a b
    { machinectl $mode list-images --full --no-legend --no-pager 2>/dev/null; machinectl $mode list --full --max-addresses=0 --no-legend --no-pager 2>/dev/null; echo ".host"; } |
        { while read -r a b; do echo " $a"; done; } |
        sort -u
}

_machinectl() {
    local cur=${COMP_WORDS[COMP_CWORD]} prev=${COMP_WORDS[COMP_CWORD-1]} words cword
    local i verb comps mode

    local -A OPTS=(
        [STANDALONE]='--all -a -l --full --help -h --no-ask-password --no-legend --no-pager --version --value
                      --mkdir --read-only --force -q --quiet --system --user --now -V'
        [ARG]='--host -H --kill-whom -M --machine --property -p -P --signal -s --uid -E --setenv -n --lines
                      -o --output --verify --format --max-addresses --runner'
    )

    local -A VERBS=(
        [STANDALONE]='list list-images clean pull-tar pull-raw list-transfers cancel-transfer import-fs'
        [MACHINES]='status show start stop login shell enable disable poweroff reboot restart pause resume terminate kill
                    image-status show-image remove export-tar export-raw'
        [MACHINES_OR_FILES]='edit cat'
        [MACHINE_ONLY]='clone rename set-limit bind-volume unbind-volume'
        [READONLY]='read-only'
        [FILE]='import-tar import-raw'
        [MACHINES_AND_FILES]='copy-to copy-from bind'
    )

    _init_completion || return

    if __contains_word "--user" ${COMP_WORDS[*]}; then
        mode=--user
    else
        mode=--system
    fi

    for ((i=0; i <= COMP_CWORD; i++)); do
        if __contains_word "${COMP_WORDS[i]}" ${VERBS[*]} &&
                ! __contains_word "${COMP_WORDS[i-1]}" ${OPTS[ARG]}; then
            verb=${COMP_WORDS[i]}
            break
        fi
    done

    if __contains_word "$prev" ${OPTS[ARG]}; then
        case $prev in
            --signal|-s)
                _signals
                return
                ;;
            --kill-whom|--kill-who)
                comps='all leader'
                ;;
            --host|-H)
                comps=$(compgen -A hostname)
                ;;
            --machine|-M)
                comps=$( __get_machines $mode )
                ;;
            --property|-p|-P)
                comps=''
                ;;
            --output|-o)
                comps=$( machinectl --output=help 2>/dev/null )
                ;;
            --verify)
                comps=$( machinectl --verify=help 2>/dev/null )
                ;;
            --format)
                comps='uncompressed xz gzip bzip2 zstd'
                ;;
            --runner)
                comps='nspawn vmspawn'
                ;;
        esac
        COMPREPLY=( $(compgen -W '$comps' -- "$cur") )
        return 0
    fi

    if [[ "$cur" = -* ]]; then
        COMPREPLY=( $(compgen -W '${OPTS[*]}' -- "$cur") )
        return 0
    fi

    if [[ -z ${verb-} ]]; then
        comps=${VERBS[*]}

    elif __contains_word "$verb" ${VERBS[STANDALONE]}; then
        comps=''

    elif __contains_word "$verb" ${VERBS[MACHINES]}; then
        comps=$( __get_machines $mode )

    elif __contains_word "$verb" ${VERBS[MACHINES_OR_FILES]}; then
        comps=$( __get_machines $mode )
        compopt -o filenames
        comps+=" $(compgen -f -- "$cur")"

    elif __contains_word "$verb" ${VERBS[MACHINE_ONLY]}; then
        local k args=0
        for ((k=i+1; k < COMP_CWORD; k++)); do
            if __contains_word "${COMP_WORDS[k]}" ${OPTS[ARG]}; then
                ((k++))
            elif [[ ${COMP_WORDS[k]} = -* ]]; then
                continue
            else
                ((args++))
            fi
        done
        if (( args == 0 )); then
            comps=$( __get_machines $mode )
        else
            comps=''
        fi

    elif __contains_word "$verb" ${VERBS[READONLY]}; then
        local k args=0
        for ((k=i+1; k < COMP_CWORD; k++)); do
            if __contains_word "${COMP_WORDS[k]}" ${OPTS[ARG]}; then
                ((k++))
            elif [[ ${COMP_WORDS[k]} = -* ]]; then
                continue
            else
                ((args++))
            fi
        done
        if (( args == 0 )); then
            comps=$( __get_machines $mode )
        elif (( args == 1 )); then
            comps='true false'
        else
            comps=''
        fi

    elif __contains_word "$verb" ${VERBS[MACHINES_AND_FILES]}; then
        local k args=0
        for ((k=i+1; k < COMP_CWORD; k++)); do
            if __contains_word "${COMP_WORDS[k]}" ${OPTS[ARG]}; then
                ((k++))
            elif [[ ${COMP_WORDS[k]} = -* ]]; then
                continue
            else
                ((args++))
            fi
        done
        if (( args == 0 )); then
            comps=$( __get_machines $mode )
        elif (( args <= 2 )); then
            comps=$(compgen -f -- "$cur")
            compopt -o filenames
        else
            comps=''
        fi

    elif __contains_word "$verb" ${VERBS[FILE]}; then
        if (( COMP_CWORD == i + 1 )); then # first argument after verb
            comps=$(compgen -f -- "$cur")
            compopt -o filenames
        else
            comps=''
        fi
    fi

    COMPREPLY=( $(compgen -W '$comps' -- "$cur") )
    return 0
}

complete -F _machinectl machinectl