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62 lines
2.5 KiB
Lua
62 lines
2.5 KiB
Lua
--[[
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/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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*
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* Copyright (C) 2021 William Wilgus
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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--
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temp_loader allows some (pure) lua requires to be loaded and later garbage collected
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unfortunately the 'required' module needs to be formatted in such a way to
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pass back a reference to a function or call table in order to keep the functions
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within from being garbage collected too early
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modules that add things to _G table are unaffected by using this function
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except if later you use require or temp_loader those tables will again
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be reloaded with fresh data since nothing was recorded about the module being loaded
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modulename - same as require()
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newinstance == true -- get a new copy (from disk) of the module
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... other args for the module
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BE AWARE this bypasses the module loader
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which would allow code reuse so if you aren't careful this memory saving tool
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could spell disaster for free RAM if you load the same code multiple times
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--]]
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local function tempload(modulename, newinstance, ...)
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--http://lua-users.org/wiki/LuaModulesLoader
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local errmsg = ""
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-- Is there current a loaded module by this name?
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if package.loaded[modulename] ~= nil and not newinstance then
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return require(modulename)
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end
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-- Find source
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local modulepath = string.gsub(modulename, "%.", "/")
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for path in string.gmatch(package.path, "([^;]+)") do
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local filename = string.gsub(path, "%?", modulepath)
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--attempt to open and compile module
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local file, err = loadfile(filename)
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if file then
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-- execute the compiled chunk
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return file(... or modulename)
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end
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errmsg = table.concat({errmsg, "\n\tno file '", filename, "' (temp loader)"})
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end
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return nil, errmsg
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end
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return tempload
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