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Re: emacs-28 d9b0b73 1/2: * doc/emacs/frames.texi (Tab Bars): Describe t
From: |
Juri Linkov |
Subject: |
Re: emacs-28 d9b0b73 1/2: * doc/emacs/frames.texi (Tab Bars): Describe tab-last. |
Date: |
Mon, 15 Nov 2021 20:11:37 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (x86_64-pc-linux-gnu) |
> >>> *** New optional key binding for 'tab-last'.
> >>> If you customize the user option 'tab-bar-select-tab-modifiers' to
> >>> allow selecting tabs using their index numbers, the '<MODIFIER>-9' key
> >>> is bound to 'tab-last', and switches to the last tab. Here <MODIFIER>
> >>> is any of the modifiers in the list that is the value of
> >>> +'tab-bar-select-tab-modifiers'. You can also use positive indices,
> >>> +which count from the last tab: 1 is the last tab, 2 the one before
> >>> that, etc.
> >>
> >> Hi Juri, this contradicts what the docstring for
> >> `tab-bar-select-tab-modifiers' says about indices.
>
> Juri> Please try to type 'C-u 2 <MODIFIER>-9'.
> Juri> It selects the tab before the last tab.
> Juri> Maybe 'C-u -2 <MODIFIER>-9' should do the same?
> Juri> E.g. by using '(abs)' on the argument?
>
> Hmm, ok. I got confused by the 'tab-bar-select-tab-modifiers'
> docstring, which says
>
> List of modifier keys for selecting tab-bar tabs by their numbers.
> Possible modifier keys are `control', `meta', `shift', `hyper', `super'
> and
> `alt'. Pressing one of the modifiers in the list and a digit selects
> the tab whose number equals the digit. Negative numbers count from
> the end of the tab bar. The digit 9 selects the last (rightmost) tab.
> For easier selection of tabs by their numbers, consider customizing
> `tab-bar-tab-hints', which will show tab numbers alongside the tab name.
>
> Perhaps the option of doing C-u <digit> <MODIFIER>-9 should be
> mentioned there as well?
This is because <MODIFIER>-9 differs from other digits.
For example, '<MODIFIER>-2' selects the second tab,
but 'C-1 <MODIFIER>-2' selects the first tab. This means that
the prefix argument takes precedence over the modifier digit,
so you can select a tab that has no digit key, e.g.
'C-u 42 <MODIFIER>-2' will select the 42nd tab, and
'C-u -42 <MODIFIER>-2' will select the 42nd tab from the end.
But 'tab-last' is an exception from this rule, and its prefix argument
means to count the relative position from the last tab.
'tab-bar-select-tab' and 'tab-last' should describe their prefix arguments,
so 'tab-bar-select-tab-modifiers' could just link to their docstrings:
diff --git a/lisp/tab-bar.el b/lisp/tab-bar.el
index 5fc5124d47..9173a7b38d 100644
--- a/lisp/tab-bar.el
+++ b/lisp/tab-bar.el
@@ -91,9 +91,9 @@ tab-bar-tab-ungrouped
(defcustom tab-bar-select-tab-modifiers '()
"List of modifier keys for selecting tab-bar tabs by their numbers.
Possible modifier keys are `control', `meta', `shift', `hyper', `super' and
-`alt'. Pressing one of the modifiers in the list and a digit selects
-the tab whose number equals the digit. Negative numbers count from
-the end of the tab bar. The digit 9 selects the last (rightmost) tab.
+`alt'. Pressing one of the modifiers in the list and a digit selects the
+tab whose number equals the digit (see more at `tab-bar-select-tab').
+The digit 9 selects the last (rightmost) tab (`tab-last').
For easier selection of tabs by their numbers, consider customizing
`tab-bar-tab-hints', which will show tab numbers alongside the tab name."
:type '(set :tag "Tab selection modifier keys"
@@ -1064,7 +1064,7 @@ tab-bar-select-tab
using `tab-bar-select-tab-modifiers'), calling it without an argument
will translate its bound numeric key to the numeric argument.
TAB-NUMBER counts from 1. Negative TAB-NUMBER counts tabs from the end of
-the tab bar."
+the tab bar. The prefix argument takes precedence over the bound digit key."
(interactive "P")
(unless (integerp tab-number)
(let ((key (event-basic-type last-command-event)))
--