--- /dev/null
+;;; rainbow-mode.el --- Colorize color names in buffers
+
+;; Copyright (C) 2010-2012 Free Software Foundation, Inc
+
+;; Author: Julien Danjou <julien@danjou.info>
+;; Keywords: faces
+;; Version: 0.7
+
+;; This file is 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 sets background color to strings that match color
+;; names, e.g. #0000ff is displayed in white with a blue background.
+;;
+
+;;; Code:
+
+(eval-when-compile
+ (require 'cl))
+
+(require 'regexp-opt)
+(require 'faces)
+(require 'color)
+
+(unless (require 'xterm-color nil t)
+ (require 'ansi-color))
+
+(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\\}\\)+\\{1,4\\}\\)"
+ (1 (rainbow-colorize-itself 1)))
+ ("^\\(#\\(?:[0-9a-fA-F]\\{3\\}\\)+\\{1,4\\}\\)"
+ (0 (rainbow-colorize-itself)))
+ ("[Rr][Gg][Bb]:[0-9a-fA-F]\\{1,4\\}/[0-9a-fA-F]\\{1,4\\}/[0-9a-fA-F]\\{1,4\\}"
+ (0 (rainbow-colorize-itself)))
+ ("[Rr][Gg][Bb][Ii]:[0-9.]+/[0-9.]+/[0-9.]+"
+ (0 (rainbow-colorize-itself)))
+ ("\\(?:[Cc][Ii][Ee]\\(?:[Xx][Yy][Zz]\\|[Uu][Vv][Yy]\\|[Xx][Yy][Yy]\\|[Ll][Aa][Bb]\\|[Ll][Uu][Vv]\\)\\|[Tt][Ee][Kk][Hh][Vv][Cc]\\):[+-]?[0-9.]+\\(?:[Ee][+-]?[0-9]+\\)?/[+-]?[0-9.]+\\(?:[Ee][+-]?[0-9]+\\)?/[+-]?[0-9.]+\\(?:[Ee][+-]?[0-9]+\\)?"
+ (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]*\.?[0-9]+\s*%?\s*)"
+ (0 (rainbow-colorize-rgb)))
+ ("hsl(\s*\\([0-9]\\{1,3\\}\\)\s*,\s*\\([0-9]\\{1,3\\}\\)\s*%\s*,\s*\\([0-9]\\{1,3\\}\\)\s*%\s*)"
+ (0 (rainbow-colorize-hsl)))
+ ("hsla(\s*\\([0-9]\\{1,3\\}\\)\s*,\s*\\([0-9]\\{1,3\\}\\)\s*%\s*,\s*\\([0-9]\\{1,3\\}\\)\s*%\s*,\s*[0-9]*\.?[0-9]+\s*%?\s*)"
+ (0 (rainbow-colorize-hsl))))
+ "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
+ '(("AliceBlue" . "#F0F8FF")
+ ("AntiqueWhite" . "#FAEBD7")
+ ("Aqua" . "#00FFFF")
+ ("Aquamarine" . "#7FFFD4")
+ ("Azure" . "#F0FFFF")
+ ("Beige" . "#F5F5DC")
+ ("Bisque" . "#FFE4C4")
+ ("Black" . "#000000")
+ ("BlanchedAlmond" . "#FFEBCD")
+ ("Blue" . "#0000FF")
+ ("BlueViolet" . "#8A2BE2")
+ ("Brown" . "#A52A2A")
+ ("BurlyWood" . "#DEB887")
+ ("CadetBlue" . "#5F9EA0")
+ ("Chartreuse" . "#7FFF00")
+ ("Chocolate" . "#D2691E")
+ ("Coral" . "#FF7F50")
+ ("CornflowerBlue" . "#6495ED")
+ ("Cornsilk" . "#FFF8DC")
+ ("Crimson" . "#DC143C")
+ ("Cyan" . "#00FFFF")
+ ("DarkBlue" . "#00008B")
+ ("DarkCyan" . "#008B8B")
+ ("DarkGoldenRod" . "#B8860B")
+ ("DarkGray" . "#A9A9A9")
+ ("DarkGrey" . "#A9A9A9")
+ ("DarkGreen" . "#006400")
+ ("DarkKhaki" . "#BDB76B")
+ ("DarkMagenta" . "#8B008B")
+ ("DarkOliveGreen" . "#556B2F")
+ ("Darkorange" . "#FF8C00")
+ ("DarkOrchid" . "#9932CC")
+ ("DarkRed" . "#8B0000")
+ ("DarkSalmon" . "#E9967A")
+ ("DarkSeaGreen" . "#8FBC8F")
+ ("DarkSlateBlue" . "#483D8B")
+ ("DarkSlateGray" . "#2F4F4F")
+ ("DarkSlateGrey" . "#2F4F4F")
+ ("DarkTurquoise" . "#00CED1")
+ ("DarkViolet" . "#9400D3")
+ ("DeepPink" . "#FF1493")
+ ("DeepSkyBlue" . "#00BFFF")
+ ("DimGray" . "#696969")
+ ("DimGrey" . "#696969")
+ ("DodgerBlue" . "#1E90FF")
+ ("FireBrick" . "#B22222")
+ ("FloralWhite" . "#FFFAF0")
+ ("ForestGreen" . "#228B22")
+ ("Fuchsia" . "#FF00FF")
+ ("Gainsboro" . "#DCDCDC")
+ ("GhostWhite" . "#F8F8FF")
+ ("Gold" . "#FFD700")
+ ("GoldenRod" . "#DAA520")
+ ("Gray" . "#808080")
+ ("Grey" . "#808080")
+ ("Green" . "#008000")
+ ("GreenYellow" . "#ADFF2F")
+ ("HoneyDew" . "#F0FFF0")
+ ("HotPink" . "#FF69B4")
+ ("IndianRed" . "#CD5C5C")
+ ("Indigo" . "#4B0082")
+ ("Ivory" . "#FFFFF0")
+ ("Khaki" . "#F0E68C")
+ ("Lavender" . "#E6E6FA")
+ ("LavenderBlush" . "#FFF0F5")
+ ("LawnGreen" . "#7CFC00")
+ ("LemonChiffon" . "#FFFACD")
+ ("LightBlue" . "#ADD8E6")
+ ("LightCoral" . "#F08080")
+ ("LightCyan" . "#E0FFFF")
+ ("LightGoldenRodYellow" . "#FAFAD2")
+ ("LightGray" . "#D3D3D3")
+ ("LightGrey" . "#D3D3D3")
+ ("LightGreen" . "#90EE90")
+ ("LightPink" . "#FFB6C1")
+ ("LightSalmon" . "#FFA07A")
+ ("LightSeaGreen" . "#20B2AA")
+ ("LightSkyBlue" . "#87CEFA")
+ ("LightSlateGray" . "#778899")
+ ("LightSlateGrey" . "#778899")
+ ("LightSteelBlue" . "#B0C4DE")
+ ("LightYellow" . "#FFFFE0")
+ ("Lime" . "#00FF00")
+ ("LimeGreen" . "#32CD32")
+ ("Linen" . "#FAF0E6")
+ ("Magenta" . "#FF00FF")
+ ("Maroon" . "#800000")
+ ("MediumAquaMarine" . "#66CDAA")
+ ("MediumBlue" . "#0000CD")
+ ("MediumOrchid" . "#BA55D3")
+ ("MediumPurple" . "#9370D8")
+ ("MediumSeaGreen" . "#3CB371")
+ ("MediumSlateBlue" . "#7B68EE")
+ ("MediumSpringGreen" . "#00FA9A")
+ ("MediumTurquoise" . "#48D1CC")
+ ("MediumVioletRed" . "#C71585")
+ ("MidnightBlue" . "#191970")
+ ("MintCream" . "#F5FFFA")
+ ("MistyRose" . "#FFE4E1")
+ ("Moccasin" . "#FFE4B5")
+ ("NavajoWhite" . "#FFDEAD")
+ ("Navy" . "#000080")
+ ("OldLace" . "#FDF5E6")
+ ("Olive" . "#808000")
+ ("OliveDrab" . "#6B8E23")
+ ("Orange" . "#FFA500")
+ ("OrangeRed" . "#FF4500")
+ ("Orchid" . "#DA70D6")
+ ("PaleGoldenRod" . "#EEE8AA")
+ ("PaleGreen" . "#98FB98")
+ ("PaleTurquoise" . "#AFEEEE")
+ ("PaleVioletRed" . "#D87093")
+ ("PapayaWhip" . "#FFEFD5")
+ ("PeachPuff" . "#FFDAB9")
+ ("Peru" . "#CD853F")
+ ("Pink" . "#FFC0CB")
+ ("Plum" . "#DDA0DD")
+ ("PowderBlue" . "#B0E0E6")
+ ("Purple" . "#800080")
+ ("Red" . "#FF0000")
+ ("RosyBrown" . "#BC8F8F")
+ ("RoyalBlue" . "#4169E1")
+ ("SaddleBrown" . "#8B4513")
+ ("Salmon" . "#FA8072")
+ ("SandyBrown" . "#F4A460")
+ ("SeaGreen" . "#2E8B57")
+ ("SeaShell" . "#FFF5EE")
+ ("Sienna" . "#A0522D")
+ ("Silver" . "#C0C0C0")
+ ("SkyBlue" . "#87CEEB")
+ ("SlateBlue" . "#6A5ACD")
+ ("SlateGray" . "#708090")
+ ("SlateGrey" . "#708090")
+ ("Snow" . "#FFFAFA")
+ ("SpringGreen" . "#00FF7F")
+ ("SteelBlue" . "#4682B4")
+ ("Tan" . "#D2B48C")
+ ("Teal" . "#008080")
+ ("Thistle" . "#D8BFD8")
+ ("Tomato" . "#FF6347")
+ ("Turquoise" . "#40E0D0")
+ ("Violet" . "#EE82EE")
+ ("Wheat" . "#F5DEB3")
+ ("White" . "#FFFFFF")
+ ("WhiteSmoke" . "#F5F5F5")
+ ("Yellow" . "#FFFF00")
+ ("YellowGreen" . "#9ACD32"))
+ "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)
+
+;; LaTeX colors
+(defvar rainbow-latex-rgb-colors-font-lock-keywords
+ '(("{rgb}{\\([0-9.]+\\),\\([0-9.]+\\),\\([0-9.]+\\)}"
+ (0 (rainbow-colorize-rgb-float)))
+ ("{RGB}{\\([0-9]\\{1,3\\}\\),\\([0-9]\\{1,3\\}\\),\\([0-9]\\{1,3\\}\\)}"
+ (0 (rainbow-colorize-rgb)))
+ ("{HTML}{\\([0-9A-Fa-f]\\{6\\}\\)}"
+ (0 (rainbow-colorize-hexadecimal-without-sharp))))
+ "Font-lock keywords to add for LaTeX colors.")
+
+(defcustom rainbow-latex-colors-major-mode-list
+ '(latex-mode)
+ "List of major mode where LaTeX colors are enabled when
+`rainbow-x-colors' is set to auto."
+ :group 'rainbow)
+
+(defcustom rainbow-latex-colors 'auto
+ "When to enable LaTeX colors.
+If set to t, the LaTeX colors will be enabled. If set to nil, the
+LaTeX colors will not be enabled. If set to auto, the LaTeX colors
+will be enabled if a major mode has been detected from the
+`rainbow-latex-colors-major-mode-list'."
+ :group 'rainbow)
+
+;; Shell colors
+(defvar rainbow-ansi-colors-font-lock-keywords
+ '(("\\(\\\\[eE]\\|\\\\033\\|\\\\x1[bB]\\|\033\\)\\[\\([0-9;]*m\\)"
+ (0 (rainbow-colorize-ansi))))
+ "Font-lock keywords to add for ANSI colors.")
+
+(defcustom rainbow-ansi-colors-major-mode-list
+ '(sh-mode c-mode c++-mode)
+ "List of major mode where ANSI colors are enabled when
+`rainbow-ansi-colors' is set to auto."
+ :group 'rainbow)
+
+(defcustom rainbow-ansi-colors 'auto
+ "When to enable ANSI colors.
+If set to t, the ANSI colors will be enabled. If set to nil, the
+ANSI colors will not be enabled. If set to auto, the ANSI colors
+will be enabled if a major mode has been detected from the
+`rainbow-ansi-colors-major-mode-list'."
+ :group 'rainbow)
+
+;; Functions
+(defun rainbow-colorize-match (color &optional match)
+ "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."
+ (let ((match (or match 0)))
+ (put-text-property
+ (match-beginning match) (match-end match)
+ 'face `((:foreground ,(if (> 0.5 (rainbow-x-color-luminance color))
+ "white" "black"))
+ (:background ,color)))))
+
+(defun rainbow-colorize-itself (&optional match)
+ "Colorize a match with itself."
+ (rainbow-colorize-match (match-string-no-properties (or match 0)) match))
+
+(defun rainbow-colorize-hexadecimal-without-sharp ()
+ "Colorize an hexadecimal colors and prepend # to it."
+ (rainbow-colorize-match (concat "#" (match-string-no-properties 1))))
+
+(defun rainbow-colorize-by-assoc (assoc-list)
+ "Colorize a match with its association from ASSOC-LIST."
+ (rainbow-colorize-match (cdr (assoc-string (match-string-no-properties 0)
+ assoc-list t))))
+
+(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-hsl ()
+ "Colorize a match with itself."
+ (let ((h (/ (string-to-number (match-string-no-properties 1)) 360.0))
+ (s (/ (string-to-number (match-string-no-properties 2)) 100.0))
+ (l (/ (string-to-number (match-string-no-properties 3)) 100.0)))
+ (rainbow-colorize-match
+ (multiple-value-bind (r g b)
+ (color-hsl-to-rgb h s l)
+ (format "#%02X%02X%02X" (* r 255) (* g 255) (* b 255))))))
+
+(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-colorize-rgb-float ()
+ "Colorize a match with itself, with relative value."
+ (let ((r (* (string-to-number (match-string-no-properties 1)) 255.0))
+ (g (* (string-to-number (match-string-no-properties 2)) 255.0))
+ (b (* (string-to-number (match-string-no-properties 3)) 255.0)))
+ (rainbow-colorize-match (format "#%02X%02X%02X" r g b))))
+
+(defun rainbow-colorize-ansi ()
+ "Return a matched string propertized with ansi color face."
+ (let ((xterm-color? (featurep 'xterm-color))
+ (string (match-string-no-properties 0))
+ color)
+ (save-match-data
+ (let* ((replaced (concat
+ (replace-regexp-in-string
+ "^\\(\\\\[eE]\\|\\\\033\\|\\\\x1[bB]\\)"
+ "\033" string) "x"))
+ xterm-color-current
+ ansi-color-context
+ (applied (funcall (if xterm-color?
+ 'xterm-color-filter
+ 'ansi-color-apply)
+ replaced))
+ (face-property (get-text-property
+ 0
+ (if xterm-color? 'face 'font-lock-face)
+ applied)))
+ (unless (listp (car face-property))
+ (setq face-property (list face-property)))
+ (setq color (funcall (if xterm-color? 'cadr 'cdr)
+ (or (assq (if xterm-color?
+ :foreground
+ 'foreground-color)
+ face-property)
+ (assq (if xterm-color?
+ :background
+ 'background-color)
+ face-property))))))
+ (when color
+ (rainbow-colorize-match color))))
+
+(defun rainbow-color-luminance (red green blue)
+ "Calculate the luminance of color composed of RED, BLUE and GREEN.
+Return a value between 0 and 1."
+ (/ (+ (* .2126 red) (* .7152 green) (* .0722 blue)) 256))
+
+(defun rainbow-x-color-luminance (color)
+ "Calculate the luminance of a color string (e.g. \"#ffaa00\", \"blue\").
+Return a value between 0 and 1."
+ (let* ((values (x-color-values color))
+ (r (/ (car values) 256.0))
+ (g (/ (cadr values) 256.0))
+ (b (/ (caddr values) 256.0)))
+ (rainbow-color-luminance r g b)))
+
+(defun rainbow-turn-on ()
+ "Turn on raibow-mode."
+ (font-lock-add-keywords nil
+ 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
+ rainbow-x-colors-font-lock-keywords))
+ ;; Activate LaTeX colors?
+ (when (or (eq rainbow-latex-colors t)
+ (and (eq rainbow-latex-colors 'auto)
+ (memq major-mode rainbow-latex-colors-major-mode-list)))
+ (font-lock-add-keywords nil
+ rainbow-latex-rgb-colors-font-lock-keywords))
+ ;; Activate ANSI colors?
+ (when (or (eq rainbow-ansi-colors t)
+ (and (eq rainbow-ansi-colors 'auto)
+ (memq major-mode rainbow-ansi-colors-major-mode-list)))
+ (font-lock-add-keywords nil
+ rainbow-ansi-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
+ `(,@rainbow-hexadecimal-colors-font-lock-keywords
+ ,@rainbow-x-colors-font-lock-keywords
+ ,@rainbow-latex-rgb-colors-font-lock-keywords
+ ,@rainbow-html-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))))
+
+(provide 'rainbow-mode)
+
+;;; rainbow-mode.el ends here
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