systemd/shell-completion/bash/bootctl

# bootctl(1) completion                               -*- shell-script -*-
# SPDX-License-Identifier: LGPL-2.1+
#
# 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 <http://www.gnu.org/licenses/>.

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

__get_entry_ids() {
        bootctl --no-pager list 2>/dev/null | { while read -r a b; do [[ $a == 'id:' ]] && echo " $b"; done }
}

_bootctl() {
        local i verb comps
        local cur=${COMP_WORDS[COMP_CWORD]} prev=${COMP_WORDS[COMP_CWORD-1]}
        local -A OPTS=(
                [STANDALONE]='-h --help --no-variables -p --print-path --version --no-pager'
                       [ARG]='--path'
        )

        if __contains_word "$prev" ${OPTS[ARG]}; then
                case $prev in
                        --path)
                                if [[ -z $cur ]]; then
                                        comps=$(compgen -A directory -- "/" )
                                else
                                        comps=$(compgen -A directory -- "$cur" )
                                fi
                                compopt -o filenames
                                ;;
                esac
                COMPREPLY=( $(compgen -W '$comps' -- "$cur") )
                return 0
        fi

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

        local -A VERBS=(
                [STANDALONE]='help install list remove status update'
                [BOOTENTRY]='set-default set-oneshot'
        )

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

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

                if [[ -z $name ]]; then
                        comps=$( __get_entry_ids )
                else
                        comps=''
                fi
        fi

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

complete -F _bootctl bootctl