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+;;; ansi-color.el -- translate ANSI into text-properties
+
+;; Copyright (C) 1999  Free Software Foundation, Inc.
+
+;; Author: Alex Schroeder <a.schroeder@bsiag.ch>
+;; Maintainer: Alex Schroeder <a.schroeder@bsiag.ch>
+;; Version: 1.1.1
+;; Keywords: comm processes
+
+;; 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 2, 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; see the file COPYING.  If not, write to the
+;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+;; Boston, MA 02111-1307, USA.
+
+;;; Commentary:
+
+;; You can get the latest version of this file from my homepage
+;; <URL:http://www.geocities.com/TimesSquare/6120/emacs.html>.
+;;
+;; This file provides a function that takes a string containing ANSI
+;; control sequences and tries to replace these with text-properties.
+;;
+;; I was unable to extract this functionality from term.el for another
+;; program I wanted to extend (the MUSH client TinyTalk.el), so I had to
+;; rewrite this.
+
+;; In order to install this with TinyMush.el, add the following to your
+;; .emacs file:
+;;
+;; (setq tinymud-filter-line-hook 'my-tinymud-add-ansi-text-properties)
+;; (autoload 'ansi-color-to-text-properties "ansi-color" 
+;;   "Translates ANSI color control sequences into text-properties." t)
+;; (defun my-tinymud-add-ansi-text-properties (conn line)
+;;   "Call `ansi-color-to-text-properties' for LINE.
+;; Ignores CONN and returns nil, so that `tinymud-filter-line' continues to
+;; process triggers and everything else."
+;;   (ansi-color-to-text-properties line)
+;;   nil)
+
+;; If the ANSI sequences assume that you have a black background, you'll
+;; have to display the stuff in a frame with a black background.  You
+;; can create such a frame like this (it still looks ugly!):
+;;
+;; (defun my-black-frame ()
+;;   "Create a frame with black background."
+;;   (interactive)
+;;   (make-frame '((foreground-color . "white")
+;;              (background-color . "black"))))
+
+;;; Testing:
+
+;; If you want to test the setup, evaluate the following fragment in a
+;; buffer without font-lock-mode.  This doesn't work in buffers that
+;; have font-lock-mode!
+;;
+;; (progn
+;;   (setq line "bold and blue, bold and blue!!")
+;;   (ansi-color-to-text-properties line)
+;;   (insert line))
+
+;;; Bugs:
+
+;; Only supports the ANSI sequences that the MUSH I'm on uses (the MUSH
+;; is Elendor, see http://www.elendor.net).  To see the list of codes
+;; supported I did a `help ansi()'.  Based on this information, I used
+;; TinyTalk.el (without ANSI color support), gave myself the ANSI color
+;; flags using `@set me=ANSI' and `@set me=COLOR', and noted the ANSI
+;; escape sequences produced by the MUSH using `think ansi(r,red)' for
+;; example.
+;;
+;; The code is spaghetti-code, I hate it.
+
+
+
+;;; Code:
+
+(defvar ansi-color-faces-vector
+  [default bold  default default underline bold  default modeline]
+  "Faces used for ANSI control sequences determining a face.
+
+Those are sequences like this one: , where 1 could be one of the
+following numbers: 0 (default), 1 (hilight, rendered as bold), 4
+(underline), 5 (flashing, rendered as bold), 7 (inverse, rendered the
+same as the modeline)")
+
+(defvar ansi-color-names-vector
+  ["black" "red" "green" "yellow" "blue" "magenta" "cyan" "white"]
+  "Array of colors.
+
+Used for sequences like this one: , where 1 could be an index to a
+foreground color (red, in this case), or , where 1 could be an
+index to a background color.
+
+The default colors are: black, red, green, yellow, blue, magenta,
+cyan, and white.
+
+On a light background, I prefer: black, red, dark green, orange, blue,
+magenta, turquoise, snow4")
+
+;; The main function
+
+(defun ansi-color-to-text-properties (str)
+  "Translates ANSI color control sequences into text-properties.  
+
+The ANSI control sequences are made invisible.  The text-properties are
+added to the string given in the parameter STR."
+  ;; ANSI code for highlighting, example:  boringINTERESTINGboring
+  ;; state: start with 0, "" -> 1, "[" -> 2, "[013457]" -> 3, 
+  ;; "[013457]" -> 4, "m" -> back to 0!
+  ;; param: stored when state is 3 (in the above example: 1)
+  (let ((str-length (length str))
+        (face '(default))
+        (i 0) (char) (state 0) (param1) (param2))
+    (while (< i str-length)
+      (setq char (aref str i))
+      (cond
+       ;; Eeither just finished an ANSI control squence (state 4) or
+       ;; wrote normal chars (state 0).
+       ((and (or (= state 0) (= state 4)) (= char ?))
+        (setq state 1)); saw escape
+       ((and (= state 1) (= char ?\[)); seen escape
+        (setq state 2
+              param1 nil
+              param2 nil)); saw [, prepare for param1 and param2!
+       ((and (or (= state 2) (= state 3)); reading first or second digit
+             (string-match "[01234567]" (substring str i (1+ i))))
+        (if (= state 2); reading first digit
+            ;;  (hilight)
+            (setq param1 (string-to-number (substring str i (1+ i)))
+                  state 3); prepare to read a second digit or quit.
+          ;; if reading second digit
+          ;; such as  (green foreground)
+          (setq param2 (string-to-number (substring str i (1+ i)))
+                state 4))); read second digit, prepare to quit
+       ((and (or (= state 3) (= state 4)) (= char ?m)); reading last char: m
+        (setq state 4); state 4: m will be invisible.  Now reset face
+        ;; according to param1 and param2.
+        (if (null param2); only param1 set: no color changes!
+            ;; : default face
+            (if (= param1 0)
+                (setq face '(default))
+              ;; : hilight, : inverse, : underline, etc.
+              (add-to-list 'face (aref ansi-color-faces-vector param1)))
+          ;; If param2 is set, we are changing back- or foreground color.
+          (if (= param1 3); first digit told us to change foreground
+              ;; : red foreground
+              (add-to-list 'face (cons 'foreground-color 
+                                       (aref ansi-color-names-vector param2)))
+            ;; : green background
+            (add-to-list 'face (cons 'background-color 
+                                     (aref ansi-color-names-vector param2))))))
+       (t (setq state 0))); all other cases, state is 0.
+
+      ;; Set text-property for every char.
+      (if (> state 0); if reading ANSI codes, state > 0: make them
+                     ; invisible.
+          (put-text-property i (1+ i) 'invisible t str)
+        ;; if reading normal chars, state is 0, put them in the
+        ;; current face.
+        (put-text-property i (1+ i) 'face face str))
+      ;; next char
+      (setq i (1+ i)))))
+
+(provide 'ansi-color)
+
+;;; ansi-colors.el ends here
+
+