Re: elisp - introspection - find all functions matching a certain string

[Tassilo Horn <tassilo@member.fsf.org>]

"metaperl.com" <metaperl@gmail.com> writes:

Hi,

>> How can I get a list of all the Emacs Lisp functions currently in
>> memory which start with the string "asciidoc"
>
> It occurred to me to hijack the source of apropos.el, but the function
> which does all the work, apropos-internal, does not appear in the
> source anywhere.

,----[ C-h f apropos-internal RET ]
| apropos-internal is a built-in function in `C source code'.
| (apropos-internal REGEXP &optional PREDICATE)
| 
| Show all symbols whose names contain match for REGEXP.
| If optional 2nd arg PREDICATE is non-nil, (funcall PREDICATE SYMBOL) is done
| for each symbol and a symbol is mentioned only if that returns non-nil.
| Return list of symbols found.
`----

As you can see, it's defined in the C source code.

Regarding your original problem, you can also use this function:

--8<---------------cut here---------------start------------->8---
(defun matching-functions (regexp)
  (let (commands)
    (mapatoms (lambda (a)
                (if (and (functionp a)
                         (string-match regexp (symbol-name a)))
                    (push (symbol-name a)
                          commands))))
    (sort commands 'string-lessp)))
--8<---------------cut here---------------end--------------->8---

Bye,
Tassilo
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