Derek Peschel provided this patch and described it as follows.
"Most of the time I use Terminal in OS X, rather than xterm. I also don't
bother with the GUI versions of Emacs. So unfortunately I have no mouse
support in Emacs. Also the system I'm testing Guile on thinks my terminal
doesn't support color and I haven't fixed it yet. The attached patch makes
GDS more usable for me.
"With no mouse, the "[click here to show error stack]" design is very
inconvenient. You added a C-M (return) binding at some point. I copied
that, but I also changed the message to show it. And I made the return
work when the cursor is after the right bracket."
* emacs/gds-scheme.el (gds-display-results): Make "click here" message
more helpful for people without mice. Also extend text properties
so that a RET key press works at the end of that line.
* emacs/gds-scheme.el (gds-start-utility-guile): Use buffer-local
variable gds-client instead of client, as client is actually unbound
when the process-filter lambda runs. (i.e. This isn't Scheme code!)
* emacs/gds-scheme.el (gds-start-utility-guile): Make the extraction
of client number more robust; in particular when the client emits
comments (about auto compilation) before the number.
When you use GDS to evaluate Scheme code from Emacs, you can now use
`C-u' to indicate that you want to single step through that code. See
`Evaluating Scheme Code' in the manual for more details.
* scheme-using.texi (Evaluating Scheme Code): Document use of
`C-u' prefix with evaluation commands.
* gds-scheme.el (gds-eval-region, gds-eval-expression)
(gds-eval-defun, gds-eval-last-sexp): Support `C-u' prefix,
meaning that user wants to single step through the code.
* gds-client.scm (handle-nondebug-protocol): Add support for
setting a trap on code that is about to be evaluated.
gds-show-last-stack (RET).
(scheme-mode-map): And another: C-h S.
(scheme-mode-map): And an alternative C-h G binding for
gds-apropos, as we probably should not be using C-h C-g.
