bash-completion: add systemd-id128 support

shell-completion/bash/systemd-id128

@@ -0,0 +1,74 @@
+# networkctl(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
+        return 1
+}
+
+_systemd_id128() {
+        local i verb comps
+        local cur=${COMP_WORDS[COMP_CWORD]} prev=${COMP_WORDS[COMP_CWORD-1]}
+        local -A OPTS=(
+               [STANDALONE]='-h --help --version -p --pretty'
+                      [ARG]='-a --app-specific'
+        )
+
+        local -A VERBS=(
+                [STANDALONE]='new machine-id boot-id invocation-id help'
+        )
+
+        _init_completion || return
+
+        if __contains_word "$prev" ${OPTS[ARG]}; then
+                case $prev in
+                        --app-specific|-a)
+                                comps=""
+                                ;;
+                esac
+                COMPREPLY=( $(compgen -W '$comps' -- "$cur") )
+                return 0
+        fi
+
+        if [[ "$cur" = -* ]]; then
+                COMPREPLY=( $(compgen -W '${OPTS[*]}' -- "$cur") )
+                return 0
+        fi
+
+        for ((i=0; i < COMP_CWORD; i++)); do
+                if __contains_word "${COMP_WORDS[i]}" ${VERBS[*]} &&
+                 ! __contains_word "${COMP_WORDS[i-1]}" ${OPTS[ARG]}; then
+                        verb=${COMP_WORDS[i]}
+                        break
+                fi
+        done
+
+        if [[ -z $verb ]]; then
+                comps=${VERBS[*]}
+        elif __contains_word "$verb" ${VERBS[STANDALONE]}; then
+                comps=''
+        fi
+
+        COMPREPLY=( $(compgen -W '$comps' -- "$cur") )
+        return 0
+}
+
+complete -F _systemd_id128 systemd-id128