I cannot get colors to work in mercury-mode. Mercury is supported under prolog-mode and in the source of prolog-mode there is quite a bit of it defined(eg. see below).
;; Mercury specific patterns
(types
(if (eq prolog-system 'mercury)
(list
(regexp-opt prolog-types-i 'words)
0 'font-lock-type-face)))
(modes
(if (eq prolog-system 'mercury)
(list
(regexp-opt prolog-mode-specificators-i 'words)
0 'font-lock-constant-face)))
(directives
(if (eq prolog-system 'mercury)
(list
(regexp-opt prolog-directives-i 'words)
0 'prolog-warning-face)))
When I try using it, only face other than the default is the font-lock-comment-face. I am not familiar with writing or debugging emacs modes. How should I approach debugging this problem? If any one is using mercury-mode and got it working with colors please tell me how.
M-x list-faces-displaylist the faces you need? If not, maybe check fileprolog.el, to see whether/where/how they're defined.list-faces-displaywhen theprolog-modeis first loaded.