Blinking Parentheses
====================
This section describes the mechanism by which Emacs shows a matching
open parenthesis when the user inserts a close parenthesis.
- Variable: blink-paren-function
The value of this variable should be a function (of no arguments)
to be called whenever a character with close parenthesis syntax is
inserted. The value of `blink-paren-function' may be `nil', in
which case nothing is done.
- User Option: blink-matching-paren
If this variable is `nil', then `blink-matching-open' does nothing.
- User Option: blink-matching-paren-distance
This variable specifies the maximum distance to scan for a matching
parenthesis before giving up.
- User Option: blink-matching-delay
This variable specifies the number of seconds for the cursor to
remain at the matching parenthesis. A fraction of a second often
gives good results, but the default is 1, which works on all
systems.
- Command: blink-matching-open
This function is the default value of `blink-paren-function'. It
assumes that point follows a character with close parenthesis
syntax and moves the cursor momentarily to the matching opening
character. If that character is not already on the screen, it
displays the character's context in the echo area. To avoid long
delays, this function does not search farther than
`blink-matching-paren-distance' characters.
Here is an example of calling this function explicitly.
(defun interactive-blink-matching-open ()
"Indicate momentarily the start of sexp before point."
(interactive)
(let ((blink-matching-paren-distance
(buffer-size))
(blink-matching-paren t))
(blink-matching-open)))