add support for shutdown command

src/_shutdown

@@ -0,0 +1,71 @@
+#compdef shutdown
+# ------------------------------------------------------------------------------
+# Copyright (c) 2011 Github zsh-users - http://github.com/zsh-users
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above copyright
+# notice, this list of conditions and the following disclaimer in the
+# documentation and/or other materials provided with the distribution.
+#     * Neither the name of the zsh-users nor the
+# names of its contributors may be used to endorse or promote products
+# derived from this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 'AS IS' AND
+# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+# DISCLAIMED. IN NO EVENT SHALL ZSH-USERS BE LIABLE FOR ANY
+# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+# ------------------------------------------------------------------------------
+# Description
+# -----------
+#
+#  Completion script for shutdown - Shut down the system
+#
+# ------------------------------------------------------------------------------
+# Authors
+# -------
+#
+#  * Timofey Titovets <nefelim4ag@gmail.com>
+#
+# ------------------------------------------------------------------------------
+_shutdown(){
+	local -a _1st_arguments
+	_1st_arguments=(
+		"--help:Show help"
+		"-H:Halt the machine" "--halt:Halt the machine"
+		"-P:Power-off the machine" "--poweroff:Power-off the machine"
+		"-r:Reboot the machine" "--reboot:Reboot the machine"
+		"-h:Equivalent to --poweroff, overridden by --halt"
+		"-k:Dont halt/power-off/reboot, just send warnings"
+		"--no-wall:Dont send wall message before halt/power-off/reboot"
+		"-c:Cancel a pending shutdown"
+	)
+
+	local context state line expl
+	local -A opt_args
+
+	_arguments '*:: :->subcmds' && return 0
+
+	if (( CURRENT == 1 )); then
+		_describe -t commands "shutdown commands" _1st_arguments -V1
+		return
+	fi
+
+	case "$words[1]" in
+		*)
+			_arguments \
+				':list option:(now +{0,5,10,15,30} hh:mm)'
+		;;
+	esac
+}
+
+_shutdown "$@"