On Wed, 2013-05-08 at 09:32 +0200, luigi scarso wrote:

On Wed, May 8, 2013 at 2:49 AM, Kip Warner wrote:

...

Hey Luigi,

I find the \texenginename and \texengineversion useful for retrieving the backend name and version. They work fine when using the vanilla LuaTeX backend. However, when using LuaJitTeX, the aforementioned macros still seem to retrieve LuaTeX specific information and not LuaJitTeX - unless I'm doing something wrong. I was careful to ensure I passed --engine=luajittex to context as well.

-- Kip Warner -- Software Engineer OpenPGP encrypted/signed mail preferred http://www.thevertigo.com

yes, it's known and it's ok, because luajittex is not different from luatex as luatex is different from pdftex/xetex/etex (and if it's so, then it is an error). A quick check could be \startluacode if jit==nil then print("=============>This is not luajitTeX") else print("=============>You are running luajitTeX ") end \stopluacode of course one can write a global jit ={} also in luatex. Another one used in the log is \startluacode print("===================>"..string.lower(status.banner)) \stopluacode and you can search for luajittex .

My wish is that luajittex should be 100% compatible with luatex, but unfortunately there are some differences between lua5.1 used by luajit2.0 and lua5.2 that makes this wish currently impossible to satisfied at engine level --- ConTeXt is smart enough to manage these differences, but you can still write a lua script that is valid for lua5.2 but not for luajit2.0, see for example http://lua-users.org/lists/lua-l/2010-03/msg00237.html

Full compatibility between lua5.2 and luajit2.0, for what I see, is not on the top on the Mike Pall's agenda.

Thanks Luigi. That was pretty comprehensive. For my purposes, it makes no different to me whether I am using luatex or luajittex. However, in my document's front matter I like to have general information about the tools used to typeset the document, and for that reason I thought it would be nice if there was a simple and elegant way to show which backend was used. -- Kip Warner -- Software Engineer OpenPGP encrypted/signed mail preferred http://www.thevertigo.com