Import of version 0.9.1.

.gitignore

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+*.elc

highlight-parentheses.el

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+;;; highlight-parentheses.el --- highlight surrounding parentheses
+;;
+;; Copyright (C) 2007 Nikolaj Schumacher
+;;
+;; Author: Nikolaj Schumacher <bugs * nschum de>
+;; Version: 0.9.1
+;; Keywords: faces, matching
+;; URL: http://nschum.de/src/emacs/highlight-parentheses/
+;; Compatibility: GNU Emacs 22.x
+;;
+;; This file is NOT part of GNU Emacs.
+;;
+;; This program is free software; you can redistribute it and/or
+;; modify it under the terms of the GNU General Public License
+;; as published by the Free Software Foundation; either version 2
+;; of the License, or (at your option) any later version.
+;;
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+;;
+;; You should have received a copy of the GNU General Public License
+;; along with this program.  If not, see <http://www.gnu.org/licenses/>.
+;;
+;;; Commentary:
+;;
+;; Add the following to your .emacs file:
+;; (require 'highlight-parentheses)
+;;
+;; Enable `highlight-symbol-mode'.
+;;
+;;; Change Log:
+;;
+;; 2007-05-15 (0.9.1)
+;;    Support for defcustom.
+;;
+;; 2007-04-26 (0.9)
+;;    Initial Release.
+;;
+;;; Code:
+
+(require 'cl)
+
+(defgroup highlight-parentheses nil
+  "Highlight surrounding parentheses"
+  :group 'faces
+  :group 'matching)
+
+(defcustom hl-paren-colors
+  '("firebrick1" "IndianRed4" "IndianRed")
+  "*List of colors for the highlighted parentheses.
+The list starts with the the inside parentheses and moves outwards."
+  :type '(repeat color)
+  :group 'highlight-parentheses)
+
+(defvar hl-paren-overlays nil
+  "This buffers currently active overlays.")
+(make-variable-buffer-local 'hl-paren-overlays)
+
+(defvar hl-paren-last-point 0
+  "The last point for which parentheses were highlighted.
+This is used to prevent analyzing the same context over and over.")
+(make-variable-buffer-local 'hl-paren-last-point)
+
+(defun hl-paren-highlight ()
+  "Highlight the parentheses around point."
+  (unless (= (point) hl-paren-last-point)
+    (save-excursion
+      (let ((pos (point))
+            (match-pos (point))
+            (level -1)
+            (max (1- (length hl-paren-overlays))))
+        (while (and match-pos (< level max))
+          (setq match-pos
+                (when (setq pos (cadr (syntax-ppss pos)))
+                  (ignore-errors (scan-sexps pos 1))))
+          (when match-pos
+            (hl-paren-put-overlay pos (incf level))
+            (hl-paren-put-overlay (1- match-pos) (incf level))))
+        (while (< level max)
+          (hl-paren-put-overlay nil (incf level)))))
+    (setq hl-paren-last-point (point))))
+
+(defun hl-paren-put-overlay (pos n)
+  "Move or create the N'th overlay so its shown at POS."
+  (let ((ov (elt hl-paren-overlays n)))
+    (if pos
+        (if ov
+            (move-overlay ov pos (1+ pos))
+          (setq ov (make-overlay pos (1+ pos)))
+          (aset hl-paren-overlays n ov)
+          (overlay-put ov 'face
+                       (cons 'foreground-color
+                             (nth (/ n 2) hl-paren-colors))))
+      (when ov
+        (delete-overlay ov)
+        (aset hl-paren-overlays n nil)))))
+
+;;;###autoload
+(define-minor-mode highlight-parentheses-mode
+  "Minor mode to highlight the surrounding parentheses."
+  nil " hl-p" nil
+  (if highlight-parentheses-mode
+      (progn
+        (setq hl-paren-overlays
+              (make-vector (* 2 (length hl-paren-colors)) nil))
+        (add-hook 'post-command-hook 'hl-paren-highlight nil t))
+    (let (ov)
+      (dotimes (i (length hl-paren-overlays))
+        (when (setq ov (elt hl-paren-overlays i))
+          (delete-overlay ov))))
+    (kill-local-variable 'hl-paren-overlays)
+    (kill-local-variable 'hl-paren-point)
+    (remove-hook 'post-command-hook 'hl-paren-highlight t)))
+
+(provide 'highlight-parentheses)
+
+;;; highlight-parentheses.el ends here