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New minor mode 'show-paren-local-mode'

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* lisp/paren.el (show-paren--delete-overlays):
New function, extracted from show-paren-mode.
(show-paren-local-mode): New minor mode.
(show-paren-mode): Update docstring to mention it (bug#29381).

* doc/emacs/programs.texi (Matching): Update show-paren-mode section.
This commit is contained in:
Dmitry Gutov 2021-09-11 05:11:53 +03:00
parent 5c18d35acb
commit d37dcfa30f
3 changed files with 33 additions and 6 deletions
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3
doc/emacs/programs.texi
View file

@ -813,7 +813,8 @@ displayed. The default is 102400.
of automatic matching. Whenever point is before an opening delimiter
or after a closing delimiter, the delimiter, its matching delimiter,
and optionally the text between them are highlighted. To toggle Show
Paren mode, type @kbd{M-x show-paren-mode}. To customize it, type
Paren mode, type @kbd{M-x show-paren-mode}. To toggle it in single
buffer, type @kbd{M-x show-paren-local-mode}. To customize it, type
@kbd{M-x customize-group @key{RET} paren-showing}. The customizable
options which control the operation of this mode include:

4
etc/NEWS
View file

@ -983,6 +983,10 @@ achieve that.
It used to be enabled when Emacs is started in GUI mode but not when started
in text mode. The cursor still only actually blinks in GUI frames.
** New minor mode 'show-paren-local-mode'.
It serves as a local counterpart for 'show-paren-mode', allowing you
to toggle it separately in different buffers.
* Changes in Specialized Modes and Packages in Emacs 28.1

32
lisp/paren.el
View file

@ -101,9 +101,11 @@ its position."
(define-minor-mode show-paren-mode
"Toggle visualization of matching parens (Show Paren mode).
Show Paren mode is a global minor mode. When enabled, any
matching parenthesis is highlighted in `show-paren-style' after
`show-paren-delay' seconds of Emacs idle time."
When enabled, any matching parenthesis is highlighted in `show-paren-style'
after `show-paren-delay' seconds of Emacs idle time.
This is a global minor mode. To toggle the mode in a single buffer,
use `show-paren-local-mode'."
:global t :group 'paren-showing
;; Enable or disable the mechanism.
;; First get rid of the old idle timer.
@ -114,8 +116,28 @@ matching parenthesis is highlighted in `show-paren-style' after
show-paren-delay t
#'show-paren-function))
(unless show-paren-mode
(delete-overlay show-paren--overlay)
(delete-overlay show-paren--overlay-1)))
(show-paren--delete-overlays)))
(defun show-paren--delete-overlays ()
(delete-overlay show-paren--overlay)
(delete-overlay show-paren--overlay-1))
;;;###autoload
(define-minor-mode show-paren-local-mode
"Toggle `show-paren-mode' only in this buffer."
:variable (buffer-local-value 'show-paren-mode (current-buffer))
(cond
((eq show-paren-mode (default-value 'show-paren-mode))
(unless show-paren-mode
(show-paren--delete-overlays))
(kill-local-variable 'show-paren-mode))
((not (default-value 'show-paren-mode))
;; Locally enabled, but globally disabled.
(show-paren-mode 1) ; Setup the timer.
(setq-default show-paren-mode nil) ; But keep it globally disabled.
)
(t ;; Locally disabled only.
(show-paren--delete-overlays))))
(defun show-paren--unescaped-p (pos)
"Determine whether the paren after POS is unescaped."