(run-at-time
 1 nil
 (lambda ()
   (eros--make-result-overlay
       "hi"
     :format " => %s"
     :where (point)
     :duration 'command)))

I expect it to show overlay, but it doesn't (the overaly is probably instantly removed by pre-command-hook).

If I set :duration to 2 it works.

Hi, this package is great! Would it be possible also to create a wrapper for eval-region? It would work wonders with my evil-operator-eval which is based on this function. I did try to wrap it into the eros overlay function, but unfortunately the result was always nil - so it seems I'm doing something wrong. Thanks! :)

As a person, who codes mostly in Clojure, I've got used to Cider commands bindings (well, some of them) and miss them very much when I code in Emacs lisp.

The thing is there are not so many elisp counterparts to keep them in a separate package (though I thought about this), but enough not to keep them in init.el.

So, do you think it's a good idea to add another minor mode with a cider-like keymap to EROS?

It would be nice to display the results of edebug steps inline, the same way they are displayed in CIDER.

The readme says that this is on MELPA, but I do not see it, nor do I see a submission to MELPA.

eros--make-result-overlay calls backward-sexp which calls (forward-sexp -1) whose documentation says:

If unable to move over a sexp, signal scan-error with three arguments: ...

This means when you try to use eros--make-result-overlay when the cursor is at the start of a sexp, you can get a scan error, for example:
With the cursor on the f of (function arg arg), it fails with scan-error.

I just wrapped backward-sexp in ignore-errors, I don't know if there's a better fix.
bo-tato@b255f9d

Eros captures the return value of the prin1 call made by elisp--eval-last-sexp-print-value. But the return value is not subject to e.g. eval-expression-print-level|length, only its printed value is. As a result, these variables have no effect on eros' overlay display.

A possible fix is to, e.g.:

(let* ((result (eval-last-sexp eval-last-sexp-arg-internal))
	 (print-level eval-expression-print-level)
	 (print-length eval-expression-print-length)
	 (ores (prin1-to-string result t)))
...
  (eros--eval-overlay ores (point))

in eros-eval-last-sexp, and, if a string is passed to eval-overlay, do not format it with %S but use directly:

 (eros--make-result-overlay (if (stringp value) value (format "%S" value)) ...

Happy to submit a PR if you would like.