[slime-devel] Re: cannot start slime

[Steven E. Harris]

Lawrence Mitchell <wence at gmx.li> writes:

> Coming to this late, this looks like a previous bug that ought
> to have been fixed by this:
>
> 2004-01-12  Lawrence Mitchell  <wence at gmx.li>
>
> 	* slime.el (slime-events-buffer): Set `hs-block-start-regexp'
> 	before running `hs-minor-mode'.

I still experience the startup problem described, running XEmacs 21.4
with CLISP 2.33 on Cygwin. My slime.el does seem to include the patch
described above. Here is slime-events-buffer:


(defun slime-events-buffer ()
  (or (get-buffer "*slime-events*")
      (let ((buffer (get-buffer-create "*slime-events*")))
        (with-current-buffer buffer
          (lisp-mode)
          (set (make-local-variable 'hs-block-start-regexp) "^(")
          (hs-minor-mode)
          (setq font-lock-defaults nil)
          (current-buffer)))))


But note that when I switch to the *slime-events* buffer and check out
hs-block-start-regexp, I see that it's not set per the definition
above:

,----[ Evaluated in *slime-events* ]
| `hs-block-start-regexp' is a variable declared in Lisp.
|   -- loaded from "hideshow"
| 
| Value: "\\s("
| 
| This value is specific to the current buffer.
| 
| Default-value: nil
| 
| Documentation:
| Regexp for beginning of block.  Buffer-local.
`----

Where is that "\\s(" coming from? Clearly it's similar to the intended
"^(", but not anchored and perhaps not sufficient to resolve the
hs-minor-mode bug.

Ah, take a look in hideshow.el's hs-grok-mode-type function, called
form hs-minor-mode. Near the end, we find:


(let ((lookup (assoc major-mode hs-special-modes-alist)))
	  (setq hs-block-start-regexp (or (nth 1 lookup) "\\s\(")
		hs-block-end-regexp (or (nth 2 lookup) "\\s\)")
		hs-forward-sexp-func (or (nth 3 lookup) 'forward-sexp)))


The only modes in hs-special-modes-alist are c-mode and c++-mode, so
this function overwrites slime's desired regexp with "\\s(". Maybe we
should set hs-block-start-regexp /after/ calling hs-minor-mode, or
even install a special mode entry for *slime-events* in
hs-special-modes-alist.

> Just out of interest, what slime revision are you running?

I'm running the FAIRLY-STABLE version from CVS.

-- 
Steven E. Harris        :: seharris at raytheon.com
Raytheon                :: http://www.raytheon.com