GNU bug report logs - #79059
31.0.50; eshell-emit-prompt errors when front-sticky or rear-nonsticky properties are set to t

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From: Eli Zaretskii <eliz <at> gnu.org>
To: László Vaskó <hello <at> vlaci.email>, Jim Porter <jporterbugs <at> gmail.com>
Cc: 79059 <at> debbugs.gnu.org
Subject: bug#79059: 31.0.50; eshell-emit-prompt errors when front-sticky or rear-nonsticky properties are set to t
Date: Tue, 22 Jul 2025 14:22:06 +0300

> Date: Sun, 20 Jul 2025 12:00:55 +0200
> From: László Vaskó <hello <at> vlaci.email>
> 
> Hello,
> 
> Since df288d2e414 (bug#74230) eshell is more careful adding text
> properties to prompts using `eshell--append-text-property'. It's
> implementation assumes that `get-text-property' will always return a
> list. This is not true, as both `front-sticky' and `rear-nonsticky'
> properties can be set to t.
> 
> Repro:
> 
> -- 8< --
> cat <<EOF > /tmp/init-eshell-propertized-prompt.el
> ;; -*- lexical-binding: t; -*-
> (setq eshell-prompt-function 
>       (defun propertizing-prompt ()
>         (setq eshell-prompt-string (propertize "test" 'rear-nonsticky t))))
> (eshell)                           
> EOF                                                    
> emacs -Q --batch --load /tmp/init-eshell-propertized-prompt.el
> -- 8< --
> 
> Output:
> 
>     Loading eshell-alias...
>     Loading eshell-alias...done
>     Loading eshell-banner...
>     Loading eshell-banner...done
>     Loading eshell-basic...
>     Loading eshell-basic...done
>     Loading eshell-cmpl...
>     Loading eshell-cmpl...done
>     Loading eshell-extpipe...
>     Loading eshell-extpipe...done
>     Loading eshell-glob...
>     Loading eshell-glob...done
>     Loading eshell-hist...
>     Loading eshell-hist...done
>     Loading eshell-ls...
>     Loading eshell-ls...done
>     Loading eshell-pred...
>     Loading eshell-pred...done
>     Loading eshell-prompt...
>     Loading eshell-prompt...done
>     Loading eshell-script...
>     Loading eshell-script...done
>     Loading eshell-term...
>     Loading eshell-term...done
>     Loading eshell-unix...
>     Loading eshell-unix...done
> 
>     Error: wrong-type-argument (sequencep t)
>       eshell--append-text-property(0 4 rear-nonsticky (read-only font-lock-face field) #("test" 0 4 (front-sticky (read-only font-lock-face field) font-lock-face eshell-prompt read-only t field prompt rear-nonsticky t)))
>       eshell-emit-prompt()
>       run-hooks(eshell-post-command-hook)
>       eshell-mode()
>       eshell()
>       load-with-code-conversion("/tmp/init-eshell-propertized-prompt.el" "/tmp/init-eshell-propertized-prompt.el" nil t)
>       command-line-1(("--load" "/tmp/init-eshell-propertized-prompt.el"))
>       command-line()
>       normal-top-level()
> 
>     debug-early-backtrace...done
>     Wrong type argument: sequencep, t

Thanks.

Jim, could you please look into this?

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