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If I want to do some math. operation I do next:

(* 5 3)

C-x C-e (eval-last-sexp)

Here result:

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As you can see the result is in the minibuffer.

Nice.

But I need result to REPLACE math. formula. I need smt. like this:

enter image description here How I can do this?

P.S. Custom function eval-last-sexp not work for multiple cursors

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2 Answers 2

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First, in case you weren't aware, there's eval-print-last-sexp, bound to C-j in lisp-interaction-mode (for instance in the *scratch* buffer), which will print the result after the sexp (instead of displaying it in the echo area, like eval-last-sexp, but without deleting the sexp, like you want).

The following function should also delete the sexp, giving the desired effect of replacing the sexp with its desired value.

(defun eval-replace-last-sexp ()
  "Evaluate sexp before point; replace sexp with value.

The point will be at the end of the inserted value.  The replaced
sexp will be added to the kill-ring.  If the latter is not
desired, use `delete-region' instead of `kill-region', below."
  (interactive)
    (let ((beg (progn
         (backward-sexp)
         (point)))
      (end (progn
         (forward-sexp)
         (point))))
      ;; the argument of t means that result is printed into the buffer,
      ;; as we want
      (eval-last-sexp t)
      (kill-region beg end)))

Now you can call the function directly with M-x eval-replace-last-sexp or by binding it to a convenient keyboard short-cut.

5
  • It's not work for multiple cursors. It work only when I has ONE cursor. I update my post. Jan 21, 2019 at 12:01
  • Does the built-in eval-print-last-sexp (C-j in *scratch*) work with multiple cursors? (I haven't tested that yet, as I don't use multiple-cursors; I'll try to get around to it.)
    – aplaice
    Jan 21, 2019 at 12:23
  • Yes, eval-print-last-sexp successfully works for multiple cursors ONLY by C-j. If I run by name eval-print-last-sexp - than I need run every time this function. Jan 21, 2019 at 12:40
  • If I bind keybinding to eval-print-last-sexp, e.g. C-c C-l and run eval-print-last-sexp by shortcut it works with multiple-cursors. Jan 21, 2019 at 12:46
  • 1
    Investigating a bit, I think that it's just the behaviour of multiple cursors. For instance, if you use M-x kill-line directly (rather than with C-k), then it also won't work with multiple cursors. I believe that the behaviour is intentional and caused by execute-extended-command (the function that M-x is bound to) being in mc--default-cmds-to-run-once (see here). The custom eval-replace-last-sexp also seems to work with multiple cursors when bound to a key.
    – aplaice
    Jan 21, 2019 at 15:20
0

Embedded calc mode might of interest to you. Not for elisp maths, however. Check the emacs calc tutorial (info manual).

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