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Using TeXworks, I can put the following code at the very top of a TeX document:

% !TeX program = LuaLaTeX
% !TEX encoding = UTF-8

When TeXworks sees that, it will automatically use LuaLaTeX as compiler, and utf-8 encoding for this document, even if the program preferences are set to something else.

Alternatively, I can use various commands such as

\ifluatex{no problem}{stop, and inform the user}

My question: For the various TeX-specific editors (not general text editors), would the processing instructions for TeXworks also do the same thing? Or, is there some general way of ensuring the correct processing from the very start, without having to detect and generate an error later?

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    one of the answers in the linked question tex.stackexchange.com/questions/78101/… lists editors that understand those comments Sep 21, 2016 at 14:45
  • Excellent! That's what I needed to know. I could not find it via search, because I was looking for "processing" rather than "directives." It helps to know what something is called (should have known from XML).
    – user103221
    Sep 21, 2016 at 14:48
  • On that basis, I think this is a dupe
    – Joseph Wright
    Sep 21, 2016 at 15:46
  • Kile doesn't read them, for example.
    – cfr
    Sep 21, 2016 at 22:21
  • I think the key is that not very many editors can interpret these directives. Emacs (e.g.) has its own set of methods. Of course, if the files are all for your own benefit, then a lack of universality hardly matters.
    – jon
    Sep 22, 2016 at 3:40

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