Lua path setting with ZSH functions. This is another reason why ZSH is awesome: macro shell scripting. This removes the need to duplicate code for each of these functions.

lua_macro.zsh

# useful for when you have multiple lua commands for different versions
for i in lua lua5.2 lua5.1 luajit; do
function $i()
{
	# Get Lua's version
	local lua_version=$(command $0 -e "print(string.sub(_VERSION, -3))")
	# Append to Lua's paths using normal shell variable interpolation
	LUA_PATH=$(command $0 -e "print(package.path..';$HOME/.luarocks/share/lua/$lua_version/?.lua;$HOME/.luarocks/share/lua/$lua_version/?/init.lua;$HOME/.local/share/lua/$lua_version/?.lua;$HOME/.local/share/lua/$lua_version/?/init.lua')") \
	LUA_CPATH=$(command $0 -e "print(package.cpath..';$HOME/.luarocks/lib/lua/$lua_version/?.so;$HOME/.local/lib/lua/$lua_version/?.so')") \
	command $0 $*
}
done