GNU bug report logs - #78988
31.0.50; [Feature Request] Exclude derived modes and buffer names in tab-line-mode

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Package: emacs; Severity: wishlist; Reported by: Elijah Gabe Pérez <eg642616@HIDDEN>; dated Thu, 10 Jul 2025 02:21:06 UTC; Maintainer for emacs is bug-gnu-emacs@HIDDEN.

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From: =?utf-8?Q?Elijah_Gabe_P=C3=A9rez?= <eg642616@HIDDEN>
To: Juri Linkov <juri@HIDDEN>
Subject: Re: bug#78988: 31.0.50; [Feature Request] Exclude derived modes and
 buffer names in tab-line-mode
In-Reply-To: <87zfdcilgv.fsf@HIDDEN>
References: <87wm8gn5x0.fsf@HIDDEN> <87zfdcilgv.fsf@HIDDEN>
Date: Thu, 10 Jul 2025 13:26:06 -0600
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--=-=-=
Content-Type: text/plain

Juri Linkov <juri@HIDDEN> writes:

> The most powerful customization would be using `buffer-match-p` with the
> customization type `buffer-predicate` that supports a regular expression
> to match a buffer name, `derived-mode` and `major-mode` combined with
> `and`, `or` and `not`.  Maybe it would be possible even to reuse the
> existing option `tab-line-exclude-modes` when it's a plain list
> for backward compatibility.

Thanks for your ideas, this is what I have done, I've tested it and
works great:

--=-=-=
Content-Type: text/x-patch
Content-Disposition: attachment; filename=tab-line.patch

diff --git a/lisp/tab-line.el b/lisp/tab-line.el
index 761968b4457..de985da12f3 100644
--- a/lisp/tab-line.el
+++ b/lisp/tab-line.el
@@ -1242,11 +1242,12 @@ tab-line-mode
                tab-line-format))))
 
 (defcustom tab-line-exclude-modes
-  '(completion-list-mode)
+  '(or "\\` " (major-mode . completion-list-mode))
   "List of major modes for which the tab-line display is not enabled.
 Buffers under any of these major modes will not show the tab line in
 their windows, even if `global-tab-line-mode' is enabled."
-  :type '(repeat symbol)
+  :type '(choice (repeat :tag "Major modes" (symbol :value fundamental-mode))
+                 (buffer-predicate :tag "Buffer predicate"))
   :group 'tab-line
   :version "27.1")
 
@@ -1261,7 +1262,7 @@ tab-line-mode--turn-on
 and buffers that have a non-nil buffer-local value
 of `tab-line-exclude', are exempt from `tab-line-mode'."
   (unless (or (minibufferp)
-              (string-match-p "\\` " (buffer-name))
+              (buffer-match-p tab-line-exclude-modes (buffer-name))
               (memq major-mode tab-line-exclude-modes)
               (get major-mode 'tab-line-exclude)
               (buffer-local-value 'tab-line-exclude (current-buffer)))

--=-=-=
Content-Type: text/plain


But I'm wondering if we can rename `tab-line-exclude-modes` to something
like `tab-line-exclude-buffers` and let `tab-line-exclude-modes` as an
alias, since this is now more flexible and not limited to major modes.

-- 
                                          - E.G via GNU Emacs and Org.

--=-=-=--
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#78988; Package emacs. Full text available.

Message received at 78988 <at> debbugs.gnu.org:


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From: Juri Linkov <juri@HIDDEN>
To: Elijah Gabe =?iso-8859-1?Q?P=E9rez?= <eg642616@HIDDEN>
Subject: Re: bug#78988: 31.0.50; [Feature Request] Exclude derived modes and
 buffer names in tab-line-mode
In-Reply-To: <87wm8gn5x0.fsf@HIDDEN>
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Date: Thu, 10 Jul 2025 09:55:12 +0300
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> I'm wondering if it's possible to allow `tab-line-exclude-modes`
> optionally also exclude derived modes.
>
> e.g. i don't want to enable tab-line-mode in all magit buffers,
> so instead having to do:
>   (setopt tab-line-exclude-modes
>           '(magit-mode
>             magit-diff-mode
>             ...
>             ))
>
> I can just do something like this:
>   (setopt tab-line-exclude-derived-modes '(magit-mode))
>
>
> In addition to this, also support exclude buffer names, as an simple
> alternative to `display-buffer-alist` which already does this.

The most powerful customization would be using `buffer-match-p` with the
customization type `buffer-predicate` that supports a regular expression
to match a buffer name, `derived-mode` and `major-mode` combined with
`and`, `or` and `not`.  Maybe it would be possible even to reuse the
existing option `tab-line-exclude-modes` when it's a plain list
for backward compatibility.
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#78988; Package emacs. Full text available.

Message received at submit <at> debbugs.gnu.org:


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From: =?utf-8?Q?Elijah_Gabe_P=C3=A9rez?= <eg642616@HIDDEN>
To: bug-gnu-emacs@HIDDEN
Subject: 31.0.50; [Feature Request] Exclude derived modes and buffer names
 in tab-line-mode
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 Content preview: Hello I'm wondering if it's possible to allow
 `tab-line-exclude-modes`
 optionally also exclude derived modes. e.g. i don't want to enable
 tab-line-mode
 in all magit buffers, so instead having to do: (setopt tab-line-exclude-modes
 '(magit-mode magit-diff-mode ... )) 
 Content analysis details:   (1.2 points, 10.0 required)
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 0.2 FREEMAIL_ENVFROM_END_DIGIT Envelope-from freemail username ends
 in digit (eg642616[at]gmail.com)
 -0.0 SPF_HELO_PASS          SPF: HELO matches SPF record
 1.0 SPF_SOFTFAIL           SPF: sender does not match SPF record (softfail)
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Hello

I'm wondering if it's possible to allow `tab-line-exclude-modes`
optionally also exclude derived modes.

e.g. i don't want to enable tab-line-mode in all magit buffers,
so instead having to do:
  (setopt tab-line-exclude-modes
          '(magit-mode
            magit-diff-mode
            ...
            ))

I can just do something like this:
  (setopt tab-line-exclude-derived-modes '(magit-mode))


In addition to this, also support exclude buffer names, as an simple
alternative to `display-buffer-alist` which already does this.

-- 
                                          - E.G via GNU Emacs and Org.
Acknowledgement sent to Elijah Gabe Pérez <eg642616@HIDDEN>:
New bug report received and forwarded. Copy sent to juri@HIDDEN, bug-gnu-emacs@HIDDEN. Full text available.
Report forwarded to juri@HIDDEN, bug-gnu-emacs@HIDDEN:
bug#78988; Package emacs. Full text available.
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