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82 lines
3.2 KiB
Lua
82 lines
3.2 KiB
Lua
--
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-- SPDX-License-Identifier: BSD-2-Clause
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--
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-- Copyright (c) 2018 Kyle Evans <kevans@FreeBSD.org>
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--
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-- Redistribution and use in source and binary forms, with or without
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-- modification, are permitted provided that the following conditions
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-- are met:
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-- 1. Redistributions of source code must retain the above copyright
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-- notice, this list of conditions and the following disclaimer.
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-- 2. Redistributions in binary form must reproduce the above copyright
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-- notice, this list of conditions and the following disclaimer in the
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-- documentation and/or other materials provided with the distribution.
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--
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-- THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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-- ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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-- IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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-- ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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-- FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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-- DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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-- OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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-- HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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-- LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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-- OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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-- SUCH DAMAGE.
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--
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local hook = {}
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local registered_hooks = {}
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-- Module exports
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-- Register a hook type; these are the names that hooks may be registered for.
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-- It is expected that modules will register all of their hook types upon
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-- initial load. Other modules may then, at any time, register a hook for these
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-- types.
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--
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-- Naming convention: hook types should be sensible named, preferably prefixed
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-- with the name of the module that registered them. They would also ideally
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-- describe an action that may or may not match a function name.
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-- e.g. config.reloaded which takes place after config has been reloaded,
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-- possibly from a different source.
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function hook.registerType(hooktype)
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registered_hooks[hooktype] = {}
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end
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function hook.register(hooktype, hookfunc)
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local selected_hooks = registered_hooks[hooktype]
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if selected_hooks == nil then
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print("Tried registering a hook for an unknown hook type: " ..
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hooktype)
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return
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end
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selected_hooks[#selected_hooks + 1] = hookfunc
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registered_hooks[hooktype] = selected_hooks
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end
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-- Takes a hooktype and runs all functions associated with that specific hook
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-- type in the order that they were registered in. This ordering should likely
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-- not be relied upon.
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function hook.runAll(hooktype, data)
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local selected_hooks = registered_hooks[hooktype]
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if selected_hooks == nil then
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-- This message, and the print() above, should only be seen by
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-- developers. Hook type registration should have happened at
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-- module load, so if this hasn't happened then we have messed
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-- up the order in which we've loaded modules and we need to
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-- catch that as soon as possible.
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print("Tried to run hooks for an unknown hook type: " ..
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hooktype)
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return 0
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end
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if #selected_hooks > 0 then
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for _, func in ipairs(selected_hooks) do
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func(data)
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end
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end
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return #selected_hooks
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end
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return hook
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