Add completion for 'caffeinate'.

src/_caffeinate

@@ -0,0 +1,50 @@
+#compdef caffeinate
+# ------------------------------------------------------------------------------
+# Copyright (c) 2017 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 the OSX 'caffeinate' tool (man 8 caffeinate).
+#
+# -------------------------------------------------------------------------
+# Authors
+# -------
+#
+#  * Nicolas Despres <nicolas.despres@gmail.com> (initial version)
+#
+# -------------------------------------------------------------------------
+
+_arguments -s \
+  '-d[prevent the display from sleeping]' \
+  '-i[prevent the system from idle sleeping]' \
+  '-m[prevent the disk from idle sleeping]' \
+  '-s[prevent the system from sleeping but only when running on AC power]' \
+  '-u[declare that user is active]' \
+  '-t+[assertion timeout value]:delay in seconds' \
+  '-w+[waits for process to exit]:pid:_pids' \
+  '(-):command: _command_names -e' \
+  '*::args: _normal'