Make octave-mode recognise the MATLAB command spmd

Question

The parallel toolbox for MATLAB has a command, spmd (https://se.mathworks.com/help/parallel-computing/spmd.html), that octave-mode does not recognize. Note: I know how to make octave-mode recognize it as a keyword.

The problem is that MATLAB expects spmd to have a matching end, which confuses octave-mode that sees an "extra" end. In addition, the statements in between should be indented. E.g. like this:

parpool(3)
spmd
  q = magic(labindex + 2);
end

How can I make octave-mode treat spmd as per above?

The lisp snippet below makes octave-mode highlight spmd as if it was a keyword:

(font-lock-add-keywords 'octave-mode
                        '(("\\<spmd\\>". font-lock-keyword-face)))

Update: Clarified intention of workaround snippet above.

Update 2: Using Stefan's workaround partially solves the issue. The end is now matched to spmd, although indentation is to large for some reason. See below for an example of the result, where the statements

      while false
        1;             # The expected amount of indentation
      end

      spmd
          1;           # Twice the expected amount of indentation
      end

Answer 1

The font-lock-add-keywords doesn't really make "octave-mode treat spmd as a keyword", it just highlights it as such.

I suggest you M-x report-emacs-bug and request support for this new syntax.

In the mean time, you can hack your way around with something like:

(add-hook 'octave-mode-hook #'my-octave-grammar-extend)
(defun my-octave-grammar-extend ()
  (unless (assoc "spmd" smie-grammar)
    (push (cons "spmd" (cdr (assoc "while" smie-grammar)))
          smie-grammar)))

which should at least make spmd match with end (and vice-versa) and hopefully make indentation less confused.