Re: master d08c947: Make compilation-mode regexp matching case-sensitive (bug#40119)

[Mattias Engdegård]

26 mars 2020 kl. 04.42 skrev Stefan Monnier <address@hidden>:

> Then let's make it into a simple `defvar` rather than a defcustom and
> make the docstring clarify that it's only useful for temporary
> backward compatibility.

Right; patch attached.

> In sml-mode.el (GNU ELPA) I set `compilation-error-screen-columns`
> buffer-locally but it really should be rule-local.  In tuareg-mode (not
> in GNU ELPA, sadly), I set both `compilation-first-column` and
> `compilation-error-screen-columns` buffer-locally for the same reason.

And here I've been staring at OCaml type errors for years and never noticed...

* Gcc and Clang also count characters rather than columns. (Bytes, in fact. 
Perhaps we need a setting for that as well?)

* Instead of making compilation-error-regexp-alist entries even more complex 
and overloaded, perhaps we should use plists? For example, each entry could be

 (REGEXP :file FILE :line LINE ...)

Adding :first-column and :screen-columns would then be more a more natural way 
of doing it.

* There could be multiple tools with different column-number semantics sharing 
a single pattern.

* Rule-specific column-number semantics can be done today by specifying a 
function as COLUMN parameter, so perhaps no extension is necessary.

0001-Turn-compilation-error-case-fold-search-into-a-defva.patch
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