menu navigation in source file

Question

Is it available a mode that, entering a source file, scans it to find all the function, class and methods declarations and eventually install a menu that enables jumping around in the source file?

I used to use fume-mode (?) where fume is for function menu, but I haven't seen it in the list of installable packages...

Answer 1

You can use imenu-mode for that purpose. It comes shipped with emacs and most programming modes support it.

EDIT2: You could simply start it with this:

(add-hook 'prog-mode-hook (lambda () (imenu-add-to-menubar "Imenu")))

EDIT: I activate it by this code:

(defun my-try-to-add-imenu ()
  (unless (my-is-buffer-file-temp)
    (condition-case nil (imenu-add-to-menubar "Imenu") (error nil))))

(defun my-is-buffer-file-temp ()
  "Returns t if buffer is temporary buffer. This is useful to disable hooks in org export."
  (interactive)
  (unless (boundp 'my-is-buffer-file-temp-var)
    (make-local-variable 'my-is-buffer-file-temp-var)
    (setq my-is-buffer-file-temp-var (my-is-buffer-file-temp-work)))
  my-is-buffer-file-temp-var)

(add-hook 'prog-mode-hook 'my-try-to-add-imenu)

This only activates imenu-mode if the current buffer has a corresponding file. I do this in order to avoid activation of some minor modes during org-export.

The are more options available, which may require some customization to get them to work and which depend on the programming envirnment. Just to mention some:

• Emacs Code Browser
• CEDET - Collection of Emacs Development Environment Tools (C/C++)