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9ed6f9efda
The latter is good, but the former is more elegant and clear about what 'x' is. Adopt it, preferably only using the latter kind of notation where needed as values for tables.
120 lines
3.4 KiB
Lua
120 lines
3.4 KiB
Lua
--
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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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-- All rights reserved.
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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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local config = require("config")
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local core = require("core")
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local cli = {}
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-- Internal function
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-- Parses arguments to boot and returns two values: kernel_name, argstr
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-- Defaults to nil and "" respectively.
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-- This will also parse arguments to autoboot, but the with_kernel argument
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-- will need to be explicitly overwritten to false
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local function parse_boot_args(argv, with_kernel)
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if with_kernel == nil then
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with_kernel = true
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end
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if #argv == 0 then
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if with_kernel then
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return nil, ""
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else
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return ""
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end
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end
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local kernel_name
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local argstr = ""
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for _, v in ipairs(argv) do
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if with_kernel and v:sub(1,1) ~= "-" then
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kernel_name = v
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else
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argstr = argstr .. " " .. v
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end
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end
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if with_kernel then
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return kernel_name, argstr
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else
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return argstr
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end
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end
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-- Declares a global function cli_execute that attempts to dispatch the
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-- arguments passed as a lua function. This gives lua a chance to intercept
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-- builtin CLI commands like "boot"
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function cli_execute(...)
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local argv = {...}
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-- Just in case...
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if #argv == 0 then
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loader.command(...)
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return
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end
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local cmd_name = argv[1]
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local cmd = cli[cmd_name]
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if cmd ~= nil and type(cmd) == "function" then
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-- Pass argv wholesale into cmd. We could omit argv[0] since the
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-- traditional reasons for including it don't necessarily apply,
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-- it may not be totally redundant if we want to have one global
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-- handling multiple commands
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cmd(...)
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else
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loader.command(...)
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end
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end
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-- Module exports
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function cli.boot(...)
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local _, argv = cli.arguments(...)
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local kernel, argstr = parse_boot_args(argv)
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if kernel ~= nil then
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loader.perform("unload")
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config.selectkernel(kernel)
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end
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core.boot(argstr)
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end
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function cli.autoboot(...)
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local _, argv = cli.arguments(...)
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local argstr = parse_boot_args(argv, false)
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core.autoboot(argstr)
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end
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-- Used for splitting cli varargs into cmd_name and the rest of argv
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function cli.arguments(...)
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local argv = {...}
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local cmd_name
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cmd_name, argv = core.popFrontTable(argv)
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return cmd_name, argv
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end
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return cli
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