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Add modlib.G & modlib.set_environment

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This commit is contained in:
Lars Mueller 2022-10-03 18:22:59 +02:00
parent cc0c11edb4
commit b19d4febb2
1 changed files with 40 additions and 14 deletions
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54
init.lua
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@ -77,11 +77,13 @@ modules.number = "math"
local parent_dir
if not minetest then
-- TOFIX
local init_path = arg and arg[0]
parent_dir = init_path and init_path:match"^.[/\\]" or ""
end
local dir_delim = rawget(_G, "DIR_DELIM") or (rawget(_G, "package") and package.config and assert(package.config:match("^(.-)[\r\n]"))) or "/"
local dir_delim = rawget(_G, "DIR_DELIM") -- Minetest
or (rawget(_G, "package") and package.config and assert(package.config:match("^(.-)[\r\n]"))) or "/"
local function concat_path(path)
return table.concat(path, dir_delim)
@ -116,19 +118,43 @@ local function load_module(self, module_name_or_alias)
end
local rawget, rawset = rawget, rawset
modlib = setmetatable({
-- TODO bump on release
version = 98,
modname = minetest and minetest.get_current_modname(),
_RG = setmetatable({}, {
__index = function(_, index)
return rawget(_G, index)
end,
__newindex = function(_, index, value)
return rawset(_G, index, value)
end
}),
}, { __index = load_module })
modlib = setmetatable({}, { __index = load_module })
-- TODO bump on release
modlib.version = 98
if minetest then
modlib.modname = minetest.get_current_modname()
end
-- Raw globals
modlib._RG = setmetatable({}, {
__index = function(_, index)
return rawget(_G, index)
end,
__newindex = function(_, index, value)
return rawset(_G, index, value)
end
})
-- Globals merged with modlib
modlib.G = setmetatable({}, {__index = function(self, module_name)
local module = load_module(self, module_name)
if module == nil then
return _G[module_name]
end
if _G[module_name] then
setmetatable(module, {__index = _G[module_name]})
end
return module
end})
-- "Imports" modlib by changing the environment of the calling function
--! This alters environments at the expense of performance. Use with caution.
--! Prefer localizing modlib library functions or API tables if possible.
function modlib.set_environment()
setfenv(2, setmetatable({}, {__index = modlib.G}))
end
-- Force load file module to pass dir_delim & to set concat_path
modlib.file = assert(loadfile(get_resource"file.lua"))(dir_delim)