mirror of
https://git.FreeBSD.org/src.git
synced 2024-11-28 08:02:54 +00:00
84 lines
3.2 KiB
Lua
84 lines
3.2 KiB
Lua
--
|
|
-- SPDX-License-Identifier: BSD-2-Clause-FreeBSD
|
|
--
|
|
-- Copyright (c) 2018 Kyle Evans <kevans@FreeBSD.org>
|
|
--
|
|
-- Redistribution and use in source and binary forms, with or without
|
|
-- modification, are permitted provided that the following conditions
|
|
-- are met:
|
|
-- 1. Redistributions of source code must retain the above copyright
|
|
-- notice, this list of conditions and the following disclaimer.
|
|
-- 2. 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.
|
|
--
|
|
-- THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 THE AUTHOR OR CONTRIBUTORS 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.
|
|
--
|
|
-- $FreeBSD$
|
|
--
|
|
|
|
local hook = {}
|
|
|
|
local registered_hooks = {}
|
|
|
|
-- Module exports
|
|
-- Register a hook type; these are the names that hooks may be registered for.
|
|
-- It is expected that modules will register all of their hook types upon
|
|
-- initial load. Other modules may then, at any time, register a hook for these
|
|
-- types.
|
|
--
|
|
-- Naming convention: hook types should be sensible named, preferably prefixed
|
|
-- with the name of the module that registered them. They would also ideally
|
|
-- describe an action that may or may not match a function name.
|
|
-- e.g. config.reloaded which takes place after config has been reloaded,
|
|
-- possibly from a different source.
|
|
function hook.registerType(hooktype)
|
|
registered_hooks[hooktype] = {}
|
|
end
|
|
|
|
function hook.register(hooktype, hookfunc)
|
|
local selected_hooks = registered_hooks[hooktype]
|
|
if selected_hooks == nil then
|
|
print("Tried registering a hook for an unknown hook type: " ..
|
|
hooktype)
|
|
return
|
|
end
|
|
selected_hooks[#selected_hooks + 1] = hookfunc
|
|
registered_hooks[hooktype] = selected_hooks
|
|
end
|
|
|
|
-- Takes a hooktype and runs all functions associated with that specific hook
|
|
-- type in the order that they were registered in. This ordering should likely
|
|
-- not be relied upon.
|
|
function hook.runAll(hooktype)
|
|
local selected_hooks = registered_hooks[hooktype]
|
|
if selected_hooks == nil then
|
|
-- This message, and the print() above, should only be seen by
|
|
-- developers. Hook type registration should have happened at
|
|
-- module load, so if this hasn't happened then we have messed
|
|
-- up the order in which we've loaded modules and we need to
|
|
-- catch that as soon as possible.
|
|
print("Tried to run hooks for an unknown hook type: " ..
|
|
hooktype)
|
|
return 0
|
|
end
|
|
if #selected_hooks > 0 then
|
|
for _, func in ipairs(selected_hooks) do
|
|
func()
|
|
end
|
|
end
|
|
return #selected_hooks
|
|
end
|
|
|
|
return hook
|