;;; Code:
+(defgroup paren-showing nil
+ "Showing (un)matching of parens and expressions."
+ :prefix "show-paren-"
+ :group 'paren-matching)
+
;; This is the overlay used to highlight the matching paren.
(defvar show-paren-overlay nil)
;; This is the overlay used to highlight the closeparen right before point.
(defvar show-paren-overlay-1 nil)
-(defvar show-paren-mode nil)
(defvar show-paren-idle-timer nil)
-(defvar show-paren-mismatch-face nil)
-
-(defvar show-paren-delay (if (featurep 'lisp-float-type) 0.125 1)
- "*Time in seconds to delay before showing the matching paren.")
-
-(defvar show-paren-face 'region
- "*Name of the face to use for showing the matching paren.")
-
;;;###autoload
(defun show-paren-mode (&optional arg)
"Toggle Show Paren mode.
Returns the new status of Show Paren mode (non-nil means on).
When Show Paren mode is enabled, any matching parenthesis is highlighted
-after `show-paren-delay' seconds of Emacs idle time."
+in `show-paren-style' after `show-paren-delay' seconds of Emacs idle time."
(interactive "P")
- (if window-system
- (let ((on-p (if arg
- (> (prefix-numeric-value arg) 0)
- (not show-paren-mode))))
- (setq blink-matching-paren-on-screen (not on-p))
- (and show-paren-idle-timer (cancel-timer show-paren-idle-timer))
- (if on-p
- (setq show-paren-idle-timer (run-with-idle-timer show-paren-delay t
- 'show-paren-function))
- (and show-paren-overlay (overlay-buffer show-paren-overlay)
- (delete-overlay show-paren-overlay))
- (and show-paren-overlay-1 (overlay-buffer show-paren-overlay-1)
- (delete-overlay show-paren-overlay-1)))
- (setq show-paren-mode on-p))))
+ (when window-system
+ (let ((on-p (if arg
+ (> (prefix-numeric-value arg) 0)
+ (not show-paren-mode))))
+ (setq blink-matching-paren-on-screen (not on-p))
+ (when show-paren-idle-timer
+ (cancel-timer show-paren-idle-timer))
+ (if on-p
+ (setq show-paren-idle-timer (run-with-idle-timer
+ show-paren-delay t
+ 'show-paren-function))
+ (and show-paren-overlay (overlay-buffer show-paren-overlay)
+ (delete-overlay show-paren-overlay))
+ (and show-paren-overlay-1 (overlay-buffer show-paren-overlay-1)
+ (delete-overlay show-paren-overlay-1)))
+ (setq show-paren-mode on-p))))
+
+;; Naughty hack. This variable was originally a `defvar' to keep track of
+;; whether Show Paren mode was turned on or not. As a `defcustom' with
+;; special `:set' and `:require' forms, we can provide custom mode control.
+(defcustom show-paren-mode nil
+ "Toggle Show Paren mode.
+When Show Paren mode is enabled, any matching parenthesis is highlighted
+after `show-paren-delay' seconds of Emacs idle time.
+You must modify via \\[customize] for this variable to have an effect."
+ :set (lambda (symbol value)
+ (show-paren-mode (or value 0)))
+ :type 'boolean
+ :group 'paren-showing
+ :require 'paren)
+
+(defcustom show-paren-style 'parenthesis
+ "*Style used when showing a matching paren.
+Valid styles are `parenthesis' (meaning show the matching paren),
+`expression' (meaning show the entire expression enclosed by the paren) and
+`mixed' (meaning show the matching paren if it is visible, and the expression
+otherwise)."
+ :type '(choice (const parenthesis) (const expression) (const mixed))
+ :group 'paren-showing)
+
+(defcustom show-paren-delay
+ (if (featurep 'lisp-float-type) (/ (float 1) (float 8)) 1)
+ "*Time in seconds to delay before showing a matching paren."
+ :type '(number :tag "seconds")
+ :group 'paren-showing)
+
+(defface show-paren-match-face
+ '((((class color)) (:background "turquoise"))
+ (((class grayscale)) (:background "gray"))
+ (t (:reverse-video t)))
+ "Show Paren mode face used for a matching paren."
+ :group 'faces
+ :group 'paren-showing)
+
+(defface show-paren-mismatch-face
+ '((((class color)) (:foreground "white" :background "purple"))
+ (t (:reverse-video t)))
+ "Show Paren mode face used for a mismatching paren."
+ :group 'faces
+ :group 'paren-showing)
;; Find the place to show, if there is one,
;; and show it until input arrives.
;; Do nothing if no window system to display results with.
;; Do nothing if executing keyboard macro.
;; Do nothing if input is pending.
- (if window-system
- (let (pos dir mismatch (oldpos (point))
- (face show-paren-face))
- (cond ((eq (char-syntax (preceding-char)) ?\))
- (setq dir -1))
- ((eq (char-syntax (following-char)) ?\()
- (setq dir 1)))
- (if dir
- (save-excursion
- (save-restriction
- ;; Determine the range within which to look for a match.
- (if blink-matching-paren-distance
- (narrow-to-region (max (point-min)
- (- (point) blink-matching-paren-distance))
- (min (point-max)
- (+ (point) blink-matching-paren-distance))))
- ;; Scan across one sexp within that range.
- ;; Errors or nil mean there is a mismatch.
- (condition-case ()
- (setq pos (scan-sexps (point) dir))
- (error (setq pos t
- mismatch t)))
- ;; If found a "matching" paren, see if it is the right
- ;; kind of paren to match the one we started at.
- (if (integerp pos)
- (let ((beg (min pos oldpos)) (end (max pos oldpos)))
- (and (/= (char-syntax (char-after beg)) ?\$)
- (setq mismatch
- (not (eq (char-before end)
- ;; This can give nil.
- (matching-paren (char-after beg))))))))
- ;; If they don't properly match, use a different face,
- ;; or print a message.
- (if mismatch
- (progn
- (and (null show-paren-mismatch-face)
- (x-display-color-p)
- (progn
- (add-to-list 'facemenu-unlisted-faces
- 'paren-mismatch)
- (make-face 'paren-mismatch)
- (or (face-nontrivial-p 'paren-mismatch t)
- (progn
- (set-face-background 'paren-mismatch
- "purple")
- (set-face-foreground 'paren-mismatch
- "white")))
- (setq show-paren-mismatch-face 'paren-mismatch)))
- (if show-paren-mismatch-face
- (setq face show-paren-mismatch-face)
- (message "Paren mismatch"))))
- )))
- (cond (pos
- (if (or (= dir -1)
- (not (integerp pos)))
- ;; If matching backwards, highlight the closeparen
- ;; before point as well as its matching open.
- ;; If matching forward, and the openparen is unbalanced,
- ;; highlight the paren at point to indicate misbalance.
- (let ((from (if (= dir 1)
- (point)
- (forward-point -1)))
- (to (if (= dir 1)
- (forward-point 1)
- (point))))
- (if show-paren-overlay-1
- (move-overlay show-paren-overlay-1
- from to
- (current-buffer))
- (setq show-paren-overlay-1
- (make-overlay from to)))
- ;; Always set the overlay face, since it varies.
- (overlay-put show-paren-overlay-1 'face face))
- ;; Otherwise, turn off any such highlighting.
- (and show-paren-overlay-1
- (overlay-buffer show-paren-overlay-1)
- (delete-overlay show-paren-overlay-1)))
- ;; Turn on highlighting for the matching paren, if found.
- ;; If it's an unmatched paren, turn off any such highlighting.
- (or (and (not (integerp pos))
- (delete-overlay show-paren-overlay))
- (save-excursion
- (goto-char pos)
- (if show-paren-overlay
- (move-overlay show-paren-overlay
- (forward-point (- dir))
- pos
- (current-buffer))
- (setq show-paren-overlay
- (make-overlay (forward-point (- dir)) pos)))))
- ;; Always set the overlay face, since it varies.
- (overlay-put show-paren-overlay 'face face))
- (t
- ;; If not at a paren that has a match,
- ;; turn off any previous paren highlighting.
- (and show-paren-overlay (overlay-buffer show-paren-overlay)
- (delete-overlay show-paren-overlay))
- (and show-paren-overlay-1 (overlay-buffer show-paren-overlay-1)
- (delete-overlay show-paren-overlay-1)))))))
+ (when window-system
+ (let (pos dir mismatch face (oldpos (point)))
+ (cond ((eq (char-syntax (preceding-char)) ?\))
+ (setq dir -1))
+ ((eq (char-syntax (following-char)) ?\()
+ (setq dir 1)))
+ ;;
+ ;; Find the other end of the sexp.
+ (when dir
+ (save-excursion
+ (save-restriction
+ ;; Determine the range within which to look for a match.
+ (when blink-matching-paren-distance
+ (narrow-to-region
+ (max (point-min) (- (point) blink-matching-paren-distance))
+ (min (point-max) (+ (point) blink-matching-paren-distance))))
+ ;; Scan across one sexp within that range.
+ ;; Errors or nil mean there is a mismatch.
+ (condition-case ()
+ (setq pos (scan-sexps (point) dir))
+ (error (setq pos t mismatch t)))
+ ;; If found a "matching" paren, see if it is the right
+ ;; kind of paren to match the one we started at.
+ (when (integerp pos)
+ (let ((beg (min pos oldpos)) (end (max pos oldpos)))
+ (when (/= (char-syntax (char-after beg)) ?\$)
+ (setq mismatch
+ (not (eq (char-before end)
+ ;; This can give nil.
+ (matching-paren (char-after beg)))))))))))
+ ;;
+ ;; Highlight the other end of the sexp, or unhighlight if none.
+ (if (not pos)
+ (progn
+ ;; If not at a paren that has a match,
+ ;; turn off any previous paren highlighting.
+ (and show-paren-overlay (overlay-buffer show-paren-overlay)
+ (delete-overlay show-paren-overlay))
+ (and show-paren-overlay-1 (overlay-buffer show-paren-overlay-1)
+ (delete-overlay show-paren-overlay-1)))
+ ;;
+ ;; Use the correct face.
+ (if mismatch
+ (setq face 'show-paren-mismatch-face)
+ (setq face 'show-paren-match-face))
+ ;;
+ ;; If matching backwards, highlight the closeparen
+ ;; before point as well as its matching open.
+ ;; If matching forward, and the openparen is unbalanced,
+ ;; highlight the paren at point to indicate misbalance.
+ ;; Otherwise, turn off any such highlighting.
+ (if (and (= dir 1) (integerp pos))
+ (when (and show-paren-overlay-1
+ (overlay-buffer show-paren-overlay-1))
+ (delete-overlay show-paren-overlay-1))
+ (let ((from (if (= dir 1)
+ (point)
+ (forward-point -1)))
+ (to (if (= dir 1)
+ (forward-point 1)
+ (point))))
+ (if show-paren-overlay-1
+ (move-overlay show-paren-overlay-1 from to (current-buffer))
+ (setq show-paren-overlay-1 (make-overlay from to)))
+ ;; Always set the overlay face, since it varies.
+ (overlay-put show-paren-overlay-1 'face face)))
+ ;;
+ ;; Turn on highlighting for the matching paren, if found.
+ ;; If it's an unmatched paren, turn off any such highlighting.
+ (unless (integerp pos)
+ (delete-overlay show-paren-overlay))
+ (let ((to (if (or (eq show-paren-style 'expression)
+ (and (eq show-paren-style 'mixed)
+ (not (pos-visible-in-window-p pos))))
+ (point)
+ pos))
+ (from (if (or (eq show-paren-style 'expression)
+ (and (eq show-paren-style 'mixed)
+ (not (pos-visible-in-window-p pos))))
+ pos
+ (save-excursion
+ (goto-char pos)
+ (forward-point (- dir))))))
+ (if show-paren-overlay
+ (move-overlay show-paren-overlay from to (current-buffer))
+ (setq show-paren-overlay (make-overlay from to))))
+ ;;
+ ;; Always set the overlay face, since it varies.
+ (overlay-put show-paren-overlay 'face face)))))
(provide 'paren)
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