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* bug#55245: 28.1; project--read-project-buffer predicate fails with wrong-type-argument listp
@ 2022-05-03 12:01 Reindert-Jan Ekker
  2022-05-04 10:45 ` Dmitry Gutov
  0 siblings, 1 reply; 2+ messages in thread
From: Reindert-Jan Ekker @ 2022-05-03 12:01 UTC (permalink / raw)
  To: 55245


I encountered this bug because I use helm. After the following:

(require 'helm)
(require 'helm-config)
(helm-mode 1)

the command project-switch-to-buffer always fails with "wrong type
argument listp". I posted this as a helm issue at first and got the
following answer (quoting from
https://github.com/emacs-helm/helm/issues/2506):

The bug is not helm related, it is a bug in project--read-project-buffer
(and possibly other functions which use the same predicate?), where its
predicate expect a cons cell like (bufname . buf_object) and when the
first call of the predicate used to determine default for read-buffer
returns a buffer-name, this one is called next by the predicate function
of read-buffer (which use the same predicate) with a buffer-name as
argument instead of a cons cell hence the error "wrong type argument
listp". Here a possible (quick) fix (not fully safe as it should check
if buffer is a string or a buffer or nil):

(defun project--read-project-buffer ()
      (let* ((pr (project-current t))
             (current-buffer (current-buffer))
             (other-buffer (other-buffer current-buffer))
             (other-name (buffer-name other-buffer))
             (buffers (project-buffers pr))
             (predicate
              (lambda (buffer)
                ;; BUFFER is an entry (BUF-NAME . BUF-OBJ) of Vbuffer_alist.
                (if (consp buffer)
                    (memq (cdr buffer) buffers)
                  (memq (get-buffer buffer) buffers)))))
        (read-buffer
         "Switch to buffer: "
         (when (funcall predicate (cons other-name other-buffer))
           other-name)
         nil
         predicate)))



In GNU Emacs 28.1 (build 2, aarch64-apple-darwin20.6.0, NS appkit-2022.60 Version 11.5.2 (Build 20G95))
 of 2022-05-01 built on CodeSensei-MacBook-Air.local
Windowing system distributor 'Apple', version 10.3.2022
System Description:  macOS 11.5.2

Configured using:
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Configured features:
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Major mode: elisp

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Load-path shadows:
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/Users/reindert/.emacs.d/elpa/transient-20220425.1314/transient hides /opt/homebrew/Cellar/emacs-plus@28/28.1/share/emacs/28.1/lisp/transient

Features:
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-- 
Reindert-Jan Ekker
Code Sensei





^ permalink raw reply	[flat|nested] 2+ messages in thread

* bug#55245: 28.1; project--read-project-buffer predicate fails with wrong-type-argument listp
  2022-05-03 12:01 bug#55245: 28.1; project--read-project-buffer predicate fails with wrong-type-argument listp Reindert-Jan Ekker
@ 2022-05-04 10:45 ` Dmitry Gutov
  0 siblings, 0 replies; 2+ messages in thread
From: Dmitry Gutov @ 2022-05-04 10:45 UTC (permalink / raw)
  To: Reindert-Jan Ekker, 55245-done

On 03.05.2022 15:01, Reindert-Jan Ekker wrote:
> 
> I encountered this bug because I use helm. After the following:
> 
> (require 'helm)
> (require 'helm-config)
> (helm-mode 1)
> 
> the command project-switch-to-buffer always fails with "wrong type
> argument listp". I posted this as a helm issue at first and got the
> following answer (quoting from
> https://github.com/emacs-helm/helm/issues/2506):
> 
> The bug is not helm related, it is a bug in project--read-project-buffer
> (and possibly other functions which use the same predicate?), where its
> predicate expect a cons cell like (bufname . buf_object) and when the
> first call of the predicate used to determine default for read-buffer
> returns a buffer-name, this one is called next by the predicate function
> of read-buffer (which use the same predicate) with a buffer-name as
> argument instead of a cons cell hence the error "wrong type argument
> listp". Here a possible (quick) fix (not fully safe as it should check
> if buffer is a string or a buffer or nil):

Thanks for the report.

Looks like we got it fixed in Helm.





^ permalink raw reply	[flat|nested] 2+ messages in thread

end of thread, other threads:[~2022-05-04 10:45 UTC | newest]

Thread overview: 2+ messages (download: mbox.gz follow: Atom feed
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2022-05-03 12:01 bug#55245: 28.1; project--read-project-buffer predicate fails with wrong-type-argument listp Reindert-Jan Ekker
2022-05-04 10:45 ` Dmitry Gutov

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