One of my favorite programming languages is Lua, a scripting language as old as Python and Ruby, with a much cleaner and regular syntax, the simplest C FFI that someone could find, and the impressive LuaJIT speed. So I use it as much as I can.

But Lua has a much smaller community and is still developing some parts of its ecosystem, and so I could not find an easy and simple environment manager like rbenv or rvm for Ruby to keep LuaRocks packages away from conflicting with each other. So I did one! Luas is the simplest shell script I could make in a hurry to deploy an application today to one of my customers, check it out:

$ git clone github.com:limadm/luas
$ cd luas
$ sudo make install
$ luas list
Legend:
   available
 - installed
 * active

Versions:
   lua-5.3.3
   lua-5.2.4
   lua-5.1.5
   luajit-2.1.0-beta2
   luajit-2.1.0-beta1
   luajit-2.0.4

$ luas install luajit-2.1.0-beta2
      . . . (lots of makefile output here) . . .
$ luas use luajit-2.1.0-beta2
$ which luajit
~/.luas/luajit-2.1.0-beta2/bin/luajit
$ luarocks install penlight
$ luajit
LuaJIT 2.1.0-beta2 -- Copyright (C) 2005-2016 Mike Pall. http://luajit.org/
JIT: ON SSE2 SSE3 SSE4.1 fold cse dce fwd dse narrow loop abc sink fuse
> require 'pl'
> = seq.reduce('+', seq.range(1,100))
5050

Now I can have as many moons as I want! =]