Re: Can a Lua module find out whether it is being required or dofiled?
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- Subject: Re: Can a Lua module find out whether it is being required or dofiled?
- From: Philipp Janda <siffiejoe@...>
- Date: 2015年9月23日 17:37:38 +0200
Am 23.09.2015 um 14:58 schröbte Dirk Laurie:
In a program, one can say
mymod = require "mymod"
or
mymod = dofile "mymod.lua"
Is there any way that the code of "mymod.lua" can distinguish
between these?
If `mymod.lua` has access to the debug module, it can search the stack
for the nearest `require`/`dofile` function:
local function detect()
local i = 3
local info = debug.getinfo( i, "f" )
while info do
if info.func == require then
return "require"
elseif info.func == dofile then
return "dofile"
end
i = i + 1
info = debug.getinfo( i, "f" )
end
return "other"
end
print( detect() )
Results:
$ lua -i mymod.lua
Lua 5.2.3 Copyright (C) 1994-2013 Lua.org, PUC-Rio
other
> require( "mymod" )
require
> dofile( "mymod.lua" )
dofile
> loadfile( "mymod.lua" )()
other
>
Philipp