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114 lines
3.7 KiB
Groff
114 lines
3.7 KiB
Groff
.\"
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.\" SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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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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.\" $FreeBSD$
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.\"
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.Dd October 31, 2018
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.Dt CLI.LUA 8
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.Os
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.Sh NAME
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.Nm cli.lua
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.Nd FreeBSD Lua CLI module
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.Sh DESCRIPTION
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.Nm
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contains the main functionality required to add new CLI commands, which can be
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executed at the loader prompt.
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.Pp
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Before hooking into the functionality provided by
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.Nm ,
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it must be included with a statement such as the following:
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.Pp
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.Dl local cli = require("cli")
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.Ss Adding new commands
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New loader commands may be created by adding functions to the object returned by
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requiring the
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.Nm
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module.
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.Pp
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For instance:
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.Pp
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.Bd -literal -offset indent -compact
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local cli = require("cli")
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cli.foo = function(...)
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-- Expand args to command name and the rest of argv. These arguments
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-- are pushed directly to the stack by loader, then handed off to
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-- cli_execute. cli_execute then passes them on to the invoked
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-- function, where they appear as varargs that must be peeled apart into
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-- their respective components.
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local _, argv = cli.arguments(...)
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print("This is the foo command!")
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for k, v in ipairs(argv) do
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print("arg #" .. tostring(k) .. ": '" .. v .. "'")
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end
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-- Perform a loader command directly. This will not get dispatched back
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-- to Lua, so it is acceptable to have a function of the exact same name
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-- in loader. Lua will have the first chance to handle any commands
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-- executed at the loader prompt.
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loader.perform("foo")
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end
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.Ed
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.Pp
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This function may be invoked by a user at the loader prompt by simply typing
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.Ic foo .
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Arguments may be passed to it as usual, space-delimited.
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.Ss Default Commands
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As of present, the
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.Nm
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module by default provides commands for
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.Ic autoboot ,
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.Ic boot ,
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and
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.Ic boot-conf.
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In all three cases, the
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.Xr core.lua 8
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module will load all ELF modules as-needed before executing the equivalent
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built-in loader commands.
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All non-kernel arguments to these commands are passed in the same order to the
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loader command.
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.Ss Exported Functions
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The following functions are exported from
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.Nm :
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.Bl -tag -width cli.arguments -offset indent
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.It Fn cli.arguments ...
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Takes varargs passed on the stack from
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.Xr loader 8
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to
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.Ic cli_execute ,
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splits them out into two return values: the command name, traditionally argv[0],
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and the rest of argv.
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.El
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.Sh SEE ALSO
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.Xr loader.conf 5 ,
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.Xr core.lua 8 ,
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.Xr loader 8
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.Sh AUTHORS
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The
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.Nm
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file was originally written by
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.An Kyle Evans Aq Mt kevans@FreeBSD.org .
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