How do I change the font of a parameter to a function in elisp / latex-mode

Question

I know I can add keywords to font-lock-mode using font-lock-add-keywords.

However, I would like to change the font color of the parameter to a latex function.

In Latex mode, if I write:

\cite{Somebody1999}

then Somebody1999 will be highlighted in font-lock-constant-face.

However, if I write:

\citeasnoun{Somebody1999}

Then citeasnoun is correctly colored as font-lock-keyword-face, but Somebody1999 is colored as "default". Presumably the mode recognizes that a backslash makes this a function, but it does not recognize citeasnoun as a keyword.

I've tried adding citeasnoun to the list of font-lock-keyword-face, but this did not have an effect.

Answer 1

Currently, the default highlighting used latex-mode does not let you customize the list of "cite-like" commands. But you can try something like

(add-hook 'latex-mode-hook
          (lambda ()
            (font-lock-add-keywords nil
              '(("\\\\citeasnoun{\\([^}\n]+\\)" (1 'font-lock-constant-face))))))

If you use AUCTeX, then you'll probably have to change the above code to use LaTeX-mode-hook instead.