lualoader: Attach cli command functions to cli module

Instead of the global namespace, let's attach these to the cli module. Other
users, including the "local" module, can attach functions to the cli module
at will to add other cli commands and things will still Just Work.

This distills down the candidates for functions that may be invoked via the
cli to a minimal set (boot, autoboot, arguments), rather than any function
that happens to live in the global lua namespace.

stand/lua/cli.lua

@@ -64,24 +64,6 @@ local parse_boot_args = function(argv, with_kernel)
 	end
 end
 
--- Globals
-
-function boot(...)
-	local cmd_name, argv = cli.arguments(...)
-	local kernel, argstr = parse_boot_args(argv)
-	if kernel ~= nil then
-		loader.perform("unload")
-		config.selectkernel(kernel)
-	end
-	core.boot(argstr)
-end
-
-function autoboot(...)
-	local cmd_name, argv = cli.arguments(...)
-	local argstr = parse_boot_args(argv, false)
-	core.autoboot(argstr)
-end
-
 -- Declares a global function cli_execute that attempts to dispatch the
 -- arguments passed as a lua function. This gives lua a chance to intercept
 -- builtin CLI commands like "boot"
@@ -94,7 +76,7 @@ function cli_execute(...)
 	end
 
 	local cmd_name = argv[1]
-	local cmd = _G[cmd_name]
+	local cmd = cli[cmd_name]
 	if cmd ~= nil and type(cmd) == "function" then
 		-- Pass argv wholesale into cmd. We could omit argv[0] since the
 		-- traditional reasons for including it don't necessarily apply,
@@ -109,6 +91,23 @@ end
 
 -- Module exports
 
+function cli.boot(...)
+	local cmd_name, argv = cli.arguments(...)
+	local kernel, argstr = parse_boot_args(argv)
+	if kernel ~= nil then
+		loader.perform("unload")
+		config.selectkernel(kernel)
+	end
+	core.boot(argstr)
+end
+
+function cli.autoboot(...)
+	local cmd_name, argv = cli.arguments(...)
+	local argstr = parse_boot_args(argv, false)
+	core.autoboot(argstr)
+end
+
+-- Used for splitting cli varargs into cmd_name and the rest of argv
 function cli.arguments(...)
 	local argv = {...}
 	local cmd_name = ""