Hi,
A few remarks.
In a mkiv luatex setup there are (on a unix system):
luatex : binary
mtxrun : a copy of mtxrun.lua
context : a shell script starting mtxrun
Now, the problem there is that these shebang lines are limited, i.e.
there is no way to pass an argument and we need to start luatex in lua
mode. This is why the program refered to is texlua which is a copy of or
symlink to luatex and when called with that name it knows that it has to
start in lua mode.
On windows there are two small stubs: mtxrun.exe and context.exe an both
will start luatex (no need for texlua there) with the same script etc.
In a luametatex setup we have a uniform and simpler model.
luametatex : binary
mtxrun : a copy of luametex or symlink to it
context : a copy of luametex or symlink to it
mtxrun.lua : used when mtxrun is started
context.lua : used when context is started
So, here the 'context' link (or copy) from it's name knows to start in
lua mode and load context.lua (which actually loads mtxrun.lua +
mtx-context.lua). It's the same on all platforms.
Now, already long ago we ditched all other stubs simply because given
the amount of scripts in a tex live setup it's a recipe for clashes
(scripts also have to compete with programs / scripts installed as part
of the os and other programs so even more opportunity for clashes). We
just use
mtxrun --script ...
instead (and texmfstart in a mkii setup).
These models cannot be mixed, which is why in a luametatex lmtx setup we
use "context --luatex" to start mkiv, where luametatex is the runner.
Hans
ps. I remember the times that context was considered bad because it
needed a runner, read: a script was part of the deal and a tex run
should not have such a depedency; the need to install perl or ruby was
seen as a shortcoming. We also used scripts to generate font metric
files (context didn't depend on other programs for toc and index
generation and had just one auxiliary file). But times have changed and
scripts are now hip and modern in the tex ecosysystem, which is why we
basically limit ourselves to just 'context' and 'mtxrun' and start all
the other context related scripts indirectly.
-----------------------------------------------------------------
Hans Hagen | PRAGMA ADE
Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
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