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lualoader: Add hook.lua(8) to tree

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Reviewed by:	rpokala (w/ "All Rights Reserved" previously added)
Differential Revision:	https://reviews.freebsd.org/D14815
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kevans 2018-06-09 14:26:30 +00:00
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.\"
.\" 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.
.\"
.\" $FreeBSD$
.\"
.Dd June 9, 2018
.Dt HOOK.LUA 8
.Os
.Sh NAME
.Nm hook.lua
.Nd FreeBSD hook module
.Sh DESCRIPTION
.Nm
contains functionality for defining hook types and attaching hooks.
Hooks are functions used to attach custom behaviors at pre-defined points in
loader execution.
These pre-defined points are what we refer to as
.Dq hook types .
.Pp
Before using the functionality provided by
.Nm ,
it must be included with a statement such as the following:
.Pp
.Dl local hook = require("hook")
.Ss Exported functions
The following functions are exported from
.Nm :
.Bl -tag -width hook.registerType -offset indent
.It Fn hook.registerType hooktype
Adds
.Ev hooktype
as a recognized hook type.
This allows functions to be added to run when hooks of this type are invoked
using
.Fn hook.runAll hooktype .
.It Fn hook.register hooktype hookfunc
Register
.Ev hookfunc
to be run when hooks of type
.Ev hooktype
are invoked.
.It Fn hook.runAll hooktype
Invoke all hooks registered for type
.Ev hooktype .
Hooks are invoked in the order in which they are registered.
.El
.Ss Hook Naming Guidelines
Hook names should consist of the name of the module they are defined in, as well
as a verb describing when the hook is executed, separated by a period.
For example,
.Dq config.reloaded
is defined in the
.Xr config.lua 8
module and run when the configuration is reloaded.
.Sh EXAMPLES
To register a hook to be run when configuration is reloaded:
.Pp
.Bd -literal -offset indent -compact
local hook = require("hook")
local function configuration_was_reloaded()
print("Configuration was reloaded!")
end
hook.register("config.reloaded", configuration_was_reloaded)
.Ed
.Sh AUTHORS
The
.Nm
file was originally written by
.An Kyle Evans Aq Mt kevans@FreeBSD.org .