shell-completion: Add initial completion for kmod

Based on journalctl and udevadm from systemd and adapted to kmod needs.

NEWS

@@ -6,7 +6,7 @@ kmod 15
 
 - New features:
 	- kmod static-nodes creates parent directories if given a -o option
-	- kmod binary doesn't statically link to libkmod
+	- kmod binary statically link to libkmod
 
 kmod 14
 =======

shell-completion/bash/kmod

@@ -0,0 +1,56 @@
+# kmod completion                                          -*- shell-script -*-
+#
+# This file is part of systemd.
+#
+# Copyright 2010 Ran Benita
+# Copyright (C) 2013  Intel Corporation. All rights reserved.
+#
+# 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 word=$1; shift
+        for w in "$@"; do [[ "$w" = "$word" ]] && return 0; done
+        return 1
+}
+
+_kmod() {
+        local cur=${COMP_WORDS[COMP_CWORD]} prev=${COMP_WORDS[COMP_CWORD-1]}
+        local VERBS=(help list static-nodes)
+        local OPTS='-h --help -V --version'
+        local verb
+
+        # standalone options, no other option or action allowed
+        for ((i=0; $i < $COMP_CWORD; i++)); do
+                if __contains_word "${COMP_WORDS[i]}" ${OPTS}; then
+                        return 0
+                fi
+        done
+
+        # find the action
+        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
+                COMPREPLY=( $(compgen -W '${OPTS[*]} ${VERBS[*]}' -- "$cur") )
+                return 0
+        fi
+
+        return 0
+}
+
+complete -F _kmod kmod