Mini Shell

#!/bin/bash
# Copyright 2013 Red Hat, Inc.  All rights reserved.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program 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 General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#

__contains_word() {
    local word="$1"
    shift
    for w in "$@"; do [[ $w == "$word" ]] && return 0; done
    return 1
}

_lsinitrd() {
    local cur=${COMP_WORDS[COMP_CWORD]} prev=${COMP_WORDS[COMP_CWORD - 1]}
    local -A OPTS=(
        [STANDALONE]='-s --size -h --help --unpack --unpackearly -v --verbose'
        [ARG]='-f --file -k --kver'
    )

    # shellcheck disable=SC2086
    if __contains_word "$prev" ${OPTS[ARG]}; then
        case $prev in
            --file | -f)
                comps=$(compgen -f -- "$cur")
                compopt -o filenames
                ;;
            --kver | -k)
                comps=$(
                    cd /lib/modules || return 1
                    echo [0-9]*
                )
                ;;
            *)
                return 0
                ;;
        esac
        # shellcheck disable=SC2207
        # shellcheck disable=SC2016
        COMPREPLY=($(compgen -W '$comps' -- "$cur"))
        return 0
    fi

    if [[ $cur == -* ]]; then
        # shellcheck disable=SC2207
        # shellcheck disable=SC2016
        COMPREPLY=($(compgen -W '${OPTS[*]}' -- "$cur"))
        return 0
    fi

    # shellcheck disable=SC2034
    comps=$(compgen -f -- "$cur")
    compopt -o filenames
    # shellcheck disable=SC2207
    # shellcheck disable=SC2016
    COMPREPLY=($(compgen -W '$comps' -- "$cur"))
    return 0
}

complete -F _lsinitrd lsinitrd