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Diffstat (limited to 'emacs.d/rainbow-mode.el')
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diff --git a/emacs.d/rainbow-mode.el b/emacs.d/rainbow-mode.el new file mode 100644 index 0000000..8207abc --- /dev/null +++ b/emacs.d/rainbow-mode.el @@ -0,0 +1,207 @@ +;;; rainbow-mode.el --- prints color strings with colored background + +;; Copyright (C) 2010 Julien Danjou + +;; Author: Julien Danjou <julien@danjou.info> +;; Keywords: strings, faces + +;; This file is NOT part of GNU Emacs. + +;; GNU Emacs 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 3 of the License, or +;; (at your option) any later version. + +;; GNU Emacs 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. If not, see <http://www.gnu.org/licenses/>. + +;;; Commentary: +;; This minor mode will add background to strings that matches color names. +;; i.e. +;; #0000ff +;; Will be printed in white with a blue background. +;; + +;;; Code: + +(eval-when-compile + (require 'cl)) + +(require 'regexp-opt) +(require 'faces) + +(defgroup rainbow nil + "Show color strings with a background color." + :tag "Rainbow" + :group 'help) + +;; Hexadecimal colors +(defvar rainbow-hexadecimal-colors-font-lock-keywords + '("#[0-9a-fA-F]\\{3\\}[0-9a-fA-F]\\{3\\}?" + (0 (rainbow-colorize-itself))) + "Font-lock keywords to add for hexadecimal colors.") + +;; rgb() colors +(defvar rainbow-html-rgb-colors-font-lock-keywords + '(("rgb(\s*\\([0-9]\\{1,3\\}\\(?:\s*%\\)?\\)\s*,\s*\\([0-9]\\{1,3\\}\\(?:\s*%\\)?\\)\s*,\s*\\([0-9]\\{1,3\\}\\(?:\s*%\\)?\\)\s*)" + (0 (rainbow-colorize-rgb))) + ("rgba(\s*\\([0-9]\\{1,3\\}\\(?:\s*%\\)?\\)\s*,\s*\\([0-9]\\{1,3\\}\\(?:\s*%\\)?\\)\s*,\s*\\([0-9]\\{1,3\\}\\(?:\s*%\\)?\\)\s*,\s*[0-9]\\{1,3\\}\s*%?\s*)" + (0 (rainbow-colorize-rgb)))) + "Font-lock keywords to add for RGB colors.") + +;; HTML colors name +(defvar rainbow-html-colors-font-lock-keywords nil + "Font-lock keywords to add for HTML colors.") +(make-variable-buffer-local 'rainbow-html-colors-font-lock-keywords) + +(defcustom rainbow-html-colors-alist + '(("black" . "#000000") + ("silver" . "#C0C0C0") + ("gray" . "#808080") + ("white" . "#FFFFFF") + ("maroon" . "#800000") + ("red" . "#FF0000") + ("purple" . "#800080") + ("fuchsia" . "#FF00FF") + ("green" . "#008000") + ("lime" . "#00FF00") + ("olive" . "#808000") + ("yellow" . "#FFFF00") + ("navy" . "#000080") + ("blue" . "#0000FF") + ("teal" . "#008080") + ("aqua" . "#00FFFF")) + "Alist of HTML colors. +Each entry should have the form (COLOR-NAME . HEXADECIMAL-COLOR)." + :group 'rainbow) + +(defcustom rainbow-html-colors-major-mode-list + '(html-mode css-mode php-mode nxml-mode xml-mode) + "List of major mode where HTML colors are enabled when +`rainbow-html-colors' is set to auto." + :group 'rainbow) + +(defcustom rainbow-html-colors 'auto + "When to enable HTML colors. +If set to t, the HTML colors will be enabled. If set to nil, the +HTML colors will not be enabled. If set to auto, the HTML colors +will be enabled if a major mode has been detected from the +`rainbow-html-colors-major-mode-list'." + :group 'rainbow) + +;; X colors +(defvar rainbow-x-colors-font-lock-keywords + `(,(regexp-opt (x-defined-colors) 'words) + (0 (rainbow-colorize-itself))) + "Font-lock keywords to add for X colors.") + +(defcustom rainbow-x-colors-major-mode-list + '(emacs-lisp-mode lisp-interaction-mode c-mode c++-mode java-mode) + "List of major mode where X colors are enabled when +`rainbow-x-colors' is set to auto." + :group 'rainbow) + +(defcustom rainbow-x-colors 'auto + "When to enable X colors. +If set to t, the X colors will be enabled. If set to nil, the +X colors will not be enabled. If set to auto, the X colors +will be enabled if a major mode has been detected from the +`rainbow-x-colors-major-mode-list'." + :group 'rainbow) + +;; Functions +(defun rainbow-colorize-match (color) + "Return a matched string propertized with a face whose +background is COLOR. The foreground is computed using +`rainbow-color-luminance', and is either white or black." + (put-text-property + (match-beginning 0) (match-end 0) + 'face `((:foreground ,(if (> 128.0 (rainbow-x-color-luminance color)) + "white" "black")) + (:background ,color)))) + +(defun rainbow-colorize-itself () + "Colorize a match with itself." + (rainbow-colorize-match (match-string-no-properties 0))) + +(defun rainbow-colorize-by-assoc (assoc-list) + "Colorize a match with its association from ASSOC-LIST." + (rainbow-colorize-match (cdr (assoc (match-string-no-properties 0) assoc-list)))) + +(defun rainbow-rgb-relative-to-absolute (number) + "Convert a relative NUMBER to absolute. If NUMBER is absolute, return NUMBER. +This will convert \"80 %\" to 204, \"100 %\" to 255 but \"123\" to \"123\"" + (let ((string-length (- (length number) 1))) + ;; Is this a number with %? + (if (eq (elt number string-length) ?%) + (/ (* (string-to-number (substring number 0 string-length)) 255) 100) + (string-to-number number)))) + +(defun rainbow-colorize-rgb () + "Colorize a match with itself." + (let ((r (rainbow-rgb-relative-to-absolute (match-string-no-properties 1))) + (g (rainbow-rgb-relative-to-absolute (match-string-no-properties 2))) + (b (rainbow-rgb-relative-to-absolute (match-string-no-properties 3)))) + (rainbow-colorize-match (format "#%02X%02X%02X" r g b)))) + +(defun rainbow-color-luminance (red green blue) + "Calculate the luminance of color composed of RED, BLUE and GREEN." + (floor (+ (* .2126 red) (* .7152 green) (* .0722 blue)) 256)) + +(defun rainbow-x-color-luminance (color) + "Calculate the luminance of a color string (e.g. \"#ffaa00\", \"blue\")." + (let* ((values (x-color-values color)) + (r (car values)) + (g (cadr values)) + (b (caddr values))) + (rainbow-color-luminance r g b))) + +(defun rainbow-turn-on () + "Turn on raibow-mode." + (font-lock-add-keywords nil + (list rainbow-hexadecimal-colors-font-lock-keywords)) + ;; Activate X colors? + (when (or (eq rainbow-x-colors t) + (and (eq rainbow-x-colors 'auto) + (memq major-mode rainbow-x-colors-major-mode-list))) + (font-lock-add-keywords nil + (list rainbow-x-colors-font-lock-keywords))) + ;; Activate HTML colors? + (when (or (eq rainbow-html-colors t) + (and (eq rainbow-html-colors 'auto) + (memq major-mode rainbow-html-colors-major-mode-list))) + (setq rainbow-html-colors-font-lock-keywords + `(,(regexp-opt (mapcar 'car rainbow-html-colors-alist) 'words) + (0 (rainbow-colorize-by-assoc rainbow-html-colors-alist)))) + (font-lock-add-keywords nil + `(,rainbow-html-colors-font-lock-keywords + ,@rainbow-html-rgb-colors-font-lock-keywords)))) + +(defun rainbow-turn-off () + "Turn off rainbow-mode." + (font-lock-remove-keywords + nil + (list + rainbow-hexadecimal-colors-font-lock-keywords + rainbow-html-colors-font-lock-keywords + rainbow-x-colors-font-lock-keywords + rainbow-html-rgb-colors-font-lock-keywords))) + +;;;###autoload +(define-minor-mode rainbow-mode + "Colorize strings that represent colors. +This will fontify with colors the string like \"#aabbcc\" or \"blue\"" + :lighter " Rbow" + (progn + (if rainbow-mode + (rainbow-turn-on) + (rainbow-turn-off)) + ;; Turn on font lock + (font-lock-mode 1))) + +(provide 'rainbow-mode) |