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+;;; erc-highlight-nicknames.el --- Highlights nicknames
+
+;; Copyright (C) 2007  André Riemann
+;; Copyright (C) 2008  Andy Stewart
+
+;; Author: André Riemann  <andre.riemann@web.de>
+;; Maintainer: André Riemann  <andre.riemann@web.de>
+;; Created: 2007-09-25
+;; Keywords: comm, faces
+
+;; URL: http://www.emacswiki.org/cgi-bin/wiki/ErcHighlightNicknames
+;; Compatibility: tested with
+;;   * GNU Emacs 23.0 (Erc 5.2, 5.3)
+;;   * XEmacs 21.4 (Erc 5.1) (briefly)
+;; Version: 0.4.1
+;; Last-Updated: 2008-12-07
+;; By: Andy Stewart
+
+;; This file 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, or (at your option)
+;; any later version.
+
+;; This file 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 GNU Emacs; see the file COPYING. If not, write to the Free
+;; Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+;; MA 02110-1301, USA.
+
+;;; Commentary:
+;; To activate this module, put this in your init file
+;;     (require 'erc-highlight-nicknames)
+;; and add highlight-nicknames to `erc-modules' by customizing it.
+
+;; Or put this in your init file
+;;     (and
+;;      (load-library "erc-highlight-nicknames")
+;;      (add-to-list 'erc-modules 'highlight-nicknames)
+;;      (erc-update-modules))
+
+;; Press
+;;     M-x customize-face RET erc-highlight-nick-base-face RET
+;; to customize the face that will be added before the color, if you want
+;; for example all the nicks underlined.
+
+;;; Change Log:
+;; 2008-12-07  Andy Stewart
+;;   * There was a bug that function `erc-highlight-nicknames' created
+;;     many faces for the same nickname. It would create a new one when
+;;     erc inserts text, and didn't care whether a face already existed
+;;     for this nickname.
+;;     Now I added a hash table `erc-highlight-face-table' to save the
+;;     face for a nickname. Faces are now only created, if the nickname
+;;     doesn't occur in the hash table.
+;; 2007-12-24  andre-r
+;;   * bug fixed in invert-color where color code contained spaces instead
+;;     of leading zeros
+;; 2007-12-12  andre-r
+;;   * erc-highlight-nick-base-face is by default empty now,
+;;     not inherited from `default'
+;;   * erc-button-add-face instead of put-text-property
+;;   * using `x-color-values' instead of `color-values' since XEmacs
+;;     seams to only know the former
+;; 2007-12-12  andre-r
+;;   * built in XEmacs-compatible code for text properties by Dave Marquardt
+;;     (works both in Emacs and XEmacs)
+;;   * changed it a bit so that the face for the text property is derived
+;;     from another face (hopefully it still works with XEmacs)
+;;   * for that purpose created a new, customizable face
+;; 2007-09-25  andre-r
+;;   * inital release
+
+;; This file is *NOT* part of GNU Emacs.
+
+;;; Code:
+
+(require 'erc)
+(require 'erc-button)
+
+(defface erc-highlight-nick-base-face
+  '((t nil))
+  "Base face used for highlighting nicks in erc. (Before the nick
+color is added)"
+  :group 'erc-faces)
+
+(defvar erc-highlight-face-table
+  (make-hash-table :test 'equal)
+  "The hash table that contains unique erc nickname faces.")
+
+(defun hexcolor-luminance (color)
+  "Returns the luminance of color COLOR. COLOR is a string \(e.g.
+\"#ffaa00\", \"blue\"\) `color-values' accepts. Luminance is a
+value of 0.299 red + 0.587 green + 0.114 blue and is always
+between 0 and 255."
+  (let* ((values (x-color-values color))
+         (r (car values))
+         (g (car (cdr values)))
+         (b (car (cdr (cdr values)))))
+    (floor (+ (* 0.299 r) (* 0.587 g) (* 0.114 b)) 256)))
+
+(defun invert-color (color)
+  "Returns the inverted color of COLOR."
+  (let* ((values (x-color-values color))
+         (r (car values))
+         (g (car (cdr values)))
+         (b (car (cdr (cdr values)))))
+    (format "#%04x%04x%04x"
+            (- 65535 r) (- 65535 g) (- 65535 b))))
+
+(defun erc-highlight-nicknames ()
+  "Searches for nicknames and highlights them. Uses the first
+twelve digits of the MD5 message digest of the nickname as
+color (#rrrrggggbbbb)."
+  (with-syntax-table erc-button-syntax-table
+    (let (bounds word color new-nick-face)
+      (goto-char (point-min))
+      (while (re-search-forward "\\w+" nil t)
+        (setq bounds (bounds-of-thing-at-point 'word))
+        (setq word (buffer-substring-no-properties
+                    (car bounds) (cdr bounds)))
+        (when (erc-get-server-user word)
+          (setq new-nick-face (gethash word erc-highlight-face-table))
+          (unless new-nick-face
+            (setq color (concat "#" (substring (md5 (downcase word)) 0 12)))
+            (if (equal (cdr (assoc 'background-mode (frame-parameters))) 'dark)
+                ;; if too dark for background
+                (when (< (hexcolor-luminance color) 85)
+                  (setq color (invert-color color)))
+              ;; if to bright for background
+              (when (> (hexcolor-luminance color) 170)
+                (setq color (invert-color color))))
+            (setq new-nick-face (make-symbol (concat "erc-highlight-nick-" word "-face")))
+            (copy-face 'erc-highlight-nick-base-face new-nick-face)
+            (set-face-foreground new-nick-face color)
+            (puthash word new-nick-face erc-highlight-face-table))
+          (erc-button-add-face (car bounds) (cdr bounds) new-nick-face))))))
+
+(define-erc-module highlight-nicknames nil
+  "Search through the buffer for nicknames, and highlight."
+  ((add-hook 'erc-insert-modify-hook 'erc-highlight-nicknames t))
+  ((remove-hook 'erc-insert-modify-hook 'erc-highlight-nicknames)))
+
+(provide 'erc-highlight-nicknames)
+
+;;; erc-highlight-nicknames.el ends here
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