[slime-devel] cutting and pasting S-expressions from buffer to REPL

Stelian Ionescu sionescu at cddr.org
Mon May 14 18:50:03 UTC 2012

On Mon, 2012-05-14 at 23:05 +0530, Faheem Mitha wrote:
> Hello everyone,
> I've recently started using SLIME with SBCl on Debian, where SLIME 
> defaults to using SBCL, at least when it is installed. So far I am very 
> impressed. I haven't been able to take off and fly yet, but I'm on the 
> runway.:-)
> I'm particularly impressed by the underlining source which has compile 
> errors, and doing a popup on mouseover feature. I don't know whose idea 
> this was, but it is pretty damn cool. Does anyone know the history of this 
> feature?
> So, I have a question about SLIME. When debugging, or indeed otherwise, I 
> find it useful to copy and paste S-expressions from a buffer to the REPL. 
> I've been using the mouse for this, which is decidedly sub-optimal. I hate 
> using the mouse. I was thinking that it would be handy to have a command 
> which would copy and paste S-expressions from a buffer to the REPL, while 
> at the same time switching the buffer to the REPL. The S-expression would 
> be chosen by having the cusor to the right of the closing expression. I'm 
> not sure if this position has a name.
> I don't know if this command already exists. I could not find it in the 
> manual. If it doesn't, could someone tell me what code would tell emacs to 
> do this? My knowledge of Emacs programming is non-existent.

This is what I have in my .emacs(wasn't written by me and I don't
remember where I copied it from):

(defun slime-send-dwim (arg)
  "Send the appropriate forms to CL to be evaluated."
  (interactive "P")
      ;;Region selected - evaluate region
      ((not (equal mark-active nil))
       (copy-region-as-kill (mark) (point)))
      ;; At/before sexp - evaluate next sexp
      ((or (looking-at "(")
             (ignore-errors (forward-char 1))
             (looking-at "(")))
       (forward-list 1)
       (let ((end (point))
             (beg (save-excursion
                    (backward-list 1)
         (copy-region-as-kill beg end)))
      ;; At/after sexp - evaluate last sexp
      ((or (looking-at ")")
             (backward-char 1)
             (looking-at ")")))
       (if (looking-at ")")
           (forward-char 1))
       (let ((end (point))
             (beg (save-excursion
                    (backward-list 1)
         (copy-region-as-kill beg end)))
      ;; Default - evaluate enclosing top-level sexp
      (t (progn
           (while (ignore-errors (progn
           (forward-list 1)
           (let ((end (point))
                 (beg (save-excursion
                        (backward-list 1)
             (copy-region-as-kill beg end)))))
    (set-buffer (slime-output-buffer))
    (unless (eq (current-buffer) (window-buffer))
      (pop-to-buffer (current-buffer) t))
    (goto-char (point-max))
    (if arg (progn
              (other-window 1)))))

(define-key slime-mode-map (kbd "C-c s") 'slime-send-dwim)
(define-key slime-mode-map (kbd "C-c M-s") '(lambda () (interactive) (slime-send-dwim 1)))

The advantage of using these as opposed to a simple eval-expression is
that a trace of it remains in the REPL buffer, useful if you're using
cl:dribble or something similar

Stelian Ionescu a.k.a. fe[nl]ix
Quidquid latine dictum sit, altum videtur.

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