erc-highlight-nicknames.el: init
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erc-highlight-nicknames.el
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erc-highlight-nicknames.el
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;;; erc-highlight-nicknames.el
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;;; Nickname highlighting for ERC that respects your colourscheme
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;; Copyright (C) 2007 André Riemann
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;; Copyright (C) 2008 ~ 2014 Andy Stewart
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;; Author: André Riemann <andre.riemann@web.de>
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;; Maintainer: Andy Stewart <lazycat.manatee@gmail.com>
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;; Created: 2007-09-25
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;; Keywords: comm, faces
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;; URL: http://www.emacswiki.org/cgi-bin/wiki/ErcHighlightNicknames
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;; Compatibility: tested with
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;; * GNU Emacs 23.0 (Erc 5.2, 5.3)
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;; * XEmacs 21.4 (Erc 5.1) (briefly)
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;; Version: 0.4.1
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;; Last-Updated: 2014-05-09 13:18:40
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;; By: Andy Stewart
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;; This file is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 2, or (at your option)
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;; any later version.
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;; This file is distributed in the hope that it will be useful, but
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;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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;; General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs; see the file COPYING. If not, write to the Free
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;; Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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;; MA 02110-1301, USA.
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;;; Commentary:
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;; To activate this module, put this in your init file
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;; (require 'erc-highlight-nicknames)
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;; and add highlight-nicknames to `erc-modules' by customizing it.
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;; Or put this in your init file
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;; (and
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;; (load-library "erc-highlight-nicknames")
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;; (add-to-list 'erc-modules 'highlight-nicknames)
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;; (erc-update-modules))
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;; Press
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;; M-x customize-face RET erc-highlight-nick-base-face RET
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;; to customize the face that will be added before the color, if you want
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;; for example all the nicks underlined.
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;;; Change Log:
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;; 2023/10/07
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;; * Randomly pick a face out of a list of erc foreground faces
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;; and use that to determine a user's nick face. This way
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;; the possible nick colours can be customised by pressing
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;; M-x customize-apropos-faces RET erc RET.
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;;
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;; 2014/05/09
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;; * Fixed `buffer-substring-no-properties' error with Emacs 24.4.50
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;;
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;; 2008-12-07 Andy Stewart
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;; * There was a bug that function `erc-highlight-nicknames' created
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;; many faces for the same nickname. It would create a new one when
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;; erc inserts text, and didn't care whether a face already existed
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;; for this nickname.
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;; Now I added a hash table `erc-highlight-face-table' to save the
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;; face for a nickname. Faces are now only created, if the nickname
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;; doesn't occur in the hash table.
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;; 2007-12-24 andre-r
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;; * bug fixed in invert-color where color code contained spaces instead
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;; of leading zeros
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;; 2007-12-12 andre-r
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;; * erc-highlight-nick-base-face is by default empty now,
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;; not inherited from `default'
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;; * erc-button-add-face instead of put-text-property
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;; * using `x-color-values' instead of `color-values' since XEmacs
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;; seams to only know the former
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;; 2007-12-12 andre-r
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;; * built in XEmacs-compatible code for text properties by Dave Marquardt
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;; (works both in Emacs and XEmacs)
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;; * changed it a bit so that the face for the text property is derived
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;; from another face (hopefully it still works with XEmacs)
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;; * for that purpose created a new, customizable face
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;; 2007-09-25 andre-r
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;; * inital release
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;; This file is *NOT* part of GNU Emacs.
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;;; Code:
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(require 'erc)
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(require 'erc-button)
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(defvar erc-highlight-facec 16)
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(defvar erc-highlight-faces
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'(fg:erc-color-face0
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fg:erc-color-face1
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fg:erc-color-face2
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fg:erc-color-face3
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fg:erc-color-face4
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fg:erc-color-face5
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fg:erc-color-face6
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fg:erc-color-face7
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fg:erc-color-face8
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fg:erc-color-face9
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fg:erc-color-face10
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fg:erc-color-face11
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fg:erc-color-face12
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fg:erc-color-face13
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fg:erc-color-face14
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fg:erc-color-face15))
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(defface erc-highlight-nick-base-face
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'((t nil))
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"Base face used for highlighting nicks in erc. (Before the nick
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color is added)"
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:group 'erc-faces)
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(defvar erc-highlight-face-table
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(make-hash-table :test 'equal)
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"The hash table that contains unique erc nickname faces.")
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(defun hexcolor-luminance (color)
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"Returns the luminance of color COLOR. COLOR is a string \(e.g.
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\"#ffaa00\", \"blue\"\) `color-values' accepts. Luminance is a
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value of 0.299 red + 0.587 green + 0.114 blue and is always
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between 0 and 255."
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(let* ((values (x-color-values color))
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(r (car values))
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(g (car (cdr values)))
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(b (car (cdr (cdr values)))))
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(floor (+ (* 0.299 r) (* 0.587 g) (* 0.114 b)) 256)))
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(defun invert-color (color)
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"Returns the inverted color of COLOR."
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(let* ((values (x-color-values color))
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(r (car values))
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(g (car (cdr values)))
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(b (car (cdr (cdr values)))))
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(format "#%04x%04x%04x"
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(- 65535 r) (- 65535 g) (- 65535 b))))
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(defun erc-highlight-nicknames ()
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"Searches for nicknames and highlights them. Uses the first
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twelve digits of the MD5 message digest of the nickname as
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color (#rrrrggggbbbb)."
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(with-syntax-table erc-button-syntax-table
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(let (bounds bound-start bound-end word color new-nick-face)
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(goto-char (point-min))
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(while (re-search-forward "\\w+" nil t)
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(setq bounds (bounds-of-thing-at-point 'word))
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(setq bound-start (car bounds))
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(setq bound-end (cdr bounds))
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(when (and bound-start bound-end)
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(setq word (buffer-substring-no-properties bound-start bound-end))
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(when (erc-get-server-user word)
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(setq new-nick-face (gethash word erc-highlight-face-table))
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(unless new-nick-face
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(setq new-nick-face (nth (random erc-highlight-facec) erc-highlight-faces))
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(setq color (face-foreground new-nick-face))
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(if (equal (cdr (assoc 'background-mode (frame-parameters))) 'dark)
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;; if too dark for background
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(when (< (hexcolor-luminance color) 85)
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(setq color (invert-color color)))
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;; if to bright for background
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(when (> (hexcolor-luminance color) 170)
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(setq color (invert-color color))))
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(copy-face 'erc-highlight-nick-base-face new-nick-face)
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(set-face-foreground new-nick-face color)
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(puthash word new-nick-face erc-highlight-face-table))
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(erc-button-add-face bound-start bound-end new-nick-face))
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)
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))))
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(define-erc-module highlight-nicknames nil
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"Search through the buffer for nicknames, and highlight."
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((add-hook 'erc-insert-modify-hook 'erc-highlight-nicknames t))
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((remove-hook 'erc-insert-modify-hook 'erc-highlight-nicknames)))
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(provide 'erc-highlight-nicknames)
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;;; erc-highlight-nicknames.el ends here
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