Re: Can one modify a variable definition in a major mode depending on buffer name?

[Stefan Monnier]

> My use case is modifying our perl6-mode for the slight difference in
> allowable identifiers between Perl 6 and NQP (Not Quite Perl).  By
> convention, nqp files end in ".nqp" so that the buffer name should be a
> good way to automatically change the single regex bound to a var name in
> the mode file.  That would save having to write another major mode just for
> such a small change.

    (add-to-list 'auto-mode-alist '("\\.nqp\\'" . nqp-mode))

    (define-derived-mode nqp-mode perl-mode "NQP"
      "Major mode for NQP's subset of Perl 6."
      (setq-local the-var-i-need-to-change the-new-value))


-- Stefan