Re: Modules with standalone main program

[albertmcchan <albertmcchan@...>]

On Feb 26, 2018, at 10:01 PM, Dirk Laurie <dirk.laurie@gmail.com> wrote:

> You changed the rules first by monkey-patching 'require'. Why should
> the undocumented 'package.loading' be a holy cow if the
> well-documented 'require' has already been slaughtered?

just to be clear, patching require is to fix a bug.

package.loading function does not need to touch any lua c code.
It is just as easy to test against the userdata sentinel.

if mod.lua return false, require "mod" will set package.loaded.mod to false.
--> require 'mod' can potientially load mod.lua multiple times.

I read the original Roberto package proposal dated 9/17/2004,
it will not allow false (or nil) into package.loaded cache table:

https://marc.info/?l=lua-l&m=113878469246850&w=2

for some reason, translated c implementation is slightly different.

Since I am fixing require, I just use false as the sentinel,
and code package.loading function in lua instead of c.