Re: Lua 5.0 and 5.1 together

[Shmuel Zeigerman <shmuz@...>]

Diego Nehab wrote:
> If you have Lua 5.1 and
> Lua 5.0 installed on the same system, they will fight for control of
> variables LUA_INIT, LUA_PATH, and LUA_CPATH. What John proposed was that
> each version of Lua should check first for version specific environment
> variables, and only if those are not defined should Lua resort to the
> generic variables.  For example, Lua 5.1 would first try LUA_5_1_INIT,
> and, if not found, then try LUA_INIT. This is what the patch
> accomplishes.

I'm using a "dispatcher" file lua_init.lua which is pointed to by LUA_INIT:
  LUA_INIT=@c:\exe\share\lua\lua_init.lua

-- lua_init.lua
local v = string.sub(_VERSION, 5, 7)
if v == "5.0" then
    dofile("c:/exe/share/lua/5.0/compat-5.1.lua")
else
    dofile("c:/exe/share/lua/5.1/lua_init.lua")
end
-- end of lua_init.lua

The file which is run via dofile can initialize LUA_PATH, LUA_CPATH
or package.path, package.cpath

There is an overhead of running one (small) extra lua file. Other than 
that, it seems to not restrict me from using 2 versions of Lua 
simultaneously.

Could you please tell me what's wrong with that approach?

--
Shmuel