Loading in Lua Modules via Require (TLC) - lua

Question

I'm trying to use https://github.com/aptiva/TLC
I try:
$ echo $LUA_PATH; echo "====="; find .; echo "====="; luajit-2.0.0-beta10 examples/window.lua
I get:
?;?.lua;./?/init.lua
=====
.
./examples
./examples/talkingcomputer.lua
./examples/window.lua
./lst
./objc
./objc/BridgeSupport.lua
./objc/dispatch.lua
./objc/init.lua
./README.md
=====
luajit-2.0.0-beta10: error loading module 'objc' from file 'objc':
cannot read objc: Is a directory
stack traceback:
[C]: ?
[C]: in function 'require'
examples/window.lua:5: in main chunk
[C]: ?
My question: what am I doing wrong? How do I load in the objc module?
Thanks!

Answer 1

Add ./?/init.lua to LUA_PATH.

Answer 2

Some further explanation on why the accepted solution works.
When a module is required, Lua uses environment variable LUA_PATH to find the location of the required module. The special symbol '?' is a wildcard that matches any string, thus when require("module") and LUA_PATH="?;./?.lua", Lua will search for 'module' and 'module.lua' in the current directory.
In the question above LUA_PATH was originally defined as:
LUA_PATH="?;?.lua;"
Once the solution was posted, the user added ./?/init.lua at the end of LUA_PATH, however it didn't work. The reason why it didn't work was that when Lua tries to solve require('objc') objc matches the first entry in LUA_PATH (?), and objc is a directory, thus the error.
The solution is to add ./?/init.lua at the beginning of LUA_PATH:
LUA_PATH="./?/init.lua;?.lua;?;"
With regard to LUA_PATH, it's important to notice that unlike environment variable PATH, directories are separated by semicolon (";"). Another way of specifying what directories to search from, it's using Lua variable package.path (inside a Lua file):
package.path = "./?/init.lua;"..package.path
local objc = require("objc")