systemd/shell-completion/bash/systemd-delta

# systemd-delta(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
}

_systemd-delta() {
    local cur=${COMP_WORDS[COMP_CWORD]} prev=${COMP_WORDS[COMP_CWORD-1]} words cword
    local comps

    local -A OPTS=(
        [STANDALONE]='--help -h --no-pager --version'
        [ARG]='--diff --type -t'
    )

    _init_completion || return


    if __contains_word "$prev" ${OPTS[ARG]}; then
        case $prev in
            --diff)
                comps='yes no'
                ;;
            --type|-t)
                comps='masked equivalent redirected overridden unchanged extended default'
                ;;
        esac
        COMPREPLY=( $(compgen -W '$comps' -- "$cur") )
        return 0
    fi

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

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

complete -F _systemd-delta systemd-delta