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bug#35727: Connecting Geiser to Guile listening to a socket: No prompt f


From: Mekeor Melire
Subject: bug#35727: Connecting Geiser to Guile listening to a socket: No prompt found! (.guile to blame)
Date: Mon, 12 Dec 2022 13:32:39 +0000

2019-05-14 06:17 sirgazil@zoho.com:

I'm getting a "No prompt found!" error when I try to connect Geiser to a Guile REPL like this:

1. In a terminal, run "$ guile --listen=/tmp/guile-socket"
2. In Emacs, "M-x geiser-connect-local", then "guile", and finally "/tmp/guile-socket"

When the Guile REPL start in Emacs, I get a "No prompt found!" in the echo area, and the prompt in the REPL looks like this:

https://multimedialib.files.wordpress.com/2019/05/emacs-geiser-guile-repl-no-prompt-found-2019-05-13.png

After trying some things out with help from str1ngs on #guix, we found out that the problem is related to the ".guile" file that seems to be generated by the system by default. In my case, ".guile" looks like this:

##########
(cond ((false-if-exception (resolve-interface '(ice-9 readline)))
       =>
       (lambda (module)
         ;; Enable completion and input history at the REPL.
         ((module-ref module 'activate-readline))))
      (else
(display "Consider installing the 'guile-readline' package for
convenient interactive line editing and input history.\n\n")))

      (unless (getenv "INSIDE_EMACS")
(cond ((false-if-exception (resolve-interface '(ice-9 colorized)))
               =>
               (lambda (module)
;; Enable completion and input history at the REPL.
                 ((module-ref module 'activate-colorized))))
              (else
(display "Consider installing the 'guile-colorized' package
for a colorful Guile experience.\n\n"))))
##########

When I remove this file and try to connect again, the "No prompt found!" error disappears, and the prompt looks normal.

Does it work when you start the Guile REPL with an environment-variable called INSIDE_EMACS? That way, it worked fine for me:

#+begin_src sh
INSIDE_EMACS=true guix repl --listen=tcp:37146
#+end_src

If this works, then I'd suggest that this is not a bug but rather you got to know that you need to deliver that environment variable to guix/guile. We could then close this ticket.

Personally, I think this is only a bug in Geiser which should be able to parse colored prompts.





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