Warning: this is an htmlized version!
The original is across this link,
and the conversion rules are here.
;;; eev-glyphs.el - change how some special characters are displayed ;; Copyright (C) 1999,2000,2001,2002,2003,2004,2005,2006,2007 Free ;; Software Foundation, Inc. ;; ;; This file is part of GNU eev. ;; ;; GNU eev 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 eev 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. ;; ;; Author: Eduardo Ochs <firstname.lastname@example.org> ;; Maintainer: Eduardo Ochs <email@example.com> ;; Version: 2010sep10 ;; Keywords: display, glyphs ;; Latest version: <http://angg.twu.net/eev-current/eev-glyphs.el> ;; htmlized: <http://angg.twu.net/eev-current/eev-glyphs.el.html> ;; See also: <http://angg.twu.net/eev-article.html#glyphs> ;;; Commentary: ;; This library sets some "glyphs" in Emacs's default display table. ;; Glyphs are usually considered ugly hacks, but I find them convenient - ;; they are easy to use, to understand (when you think that a file is ;; a sequence of bytes and each byte is a character) and to explain to ;; people. ;; ;; The following glyphs are set: ;; ;; appearance position how to type it ;; 8 (backspace) C-q C-h ;; 12 (formfeed) C-q C-l ;; ; 13 (CR) C-q C-m ;; * 15 (^O) C-q C-o ;; › 155 (CSI) ;; « and » 171 and 187 M-, < < and M-, > > ;; ;; M-, is defined in <http://angg.twu.net/eev-current/eev-compose.el> ;; <http://angg.twu.net/eev-current/eev-compose.el.html>. ;; ;; (find-elnode "Display Tables") ;; (find-elnode "Glyphs") ;; ;; Known bugs: ;; * Emacs treats most chars with codes below 32 as whitespace by ;; default, and in some cases (for example when leaving ;; picture-mode) it will remove our red stars together with the ;; "real" whitespace. ;; * When we move text with "«»"s from unibyte- to multibyte buffers ;; Emacs will convert the "«»"s to characters with higher codes ;; for which no glyphs were set; the converted "«»"s will be ;; displayed in the default face. ;; ;; (find-elnode "Defining Faces") ;; (find-efunctiondescr 'defface) ;; (find-efunction 'defface) ;; (find-efunction 'custom-declare-face) ;; (find-efile "generic-x.el" "(background light)") ;; Note: older versions of this file used to behave specially when ;; Emacs was running on a Linux VT (i.e., when TERM=linux); using ;; string glyphs and character sequences that only worked on Linux's ;; "virtual consoles" they would create a glyph for ^O that would ;; appear as a small red square instead of a red star, and do other ;; hackish things involving characters that were tricky to display. ;; ;; (find-linux26file "drivers/char/vt.c") ;; (find-man "console_codes" "ECMA-48 Set Graphics Rendition" "foreground") ;; (find-man "console_codes" "CSI (0x9B) is equivalent to ESC [") ;; (find-man "4 console_codes" "ESC % @") ;; (find-man "4 console_codes" "ESC % G") ;; (find-man "4 console_codes" "straight to character ROM") ;; (find-man "7 charsets" "1110xxxx") ;; (find-man "7 utf-8" "0x00000800 - 0x0000FFFF:") ;; (find-man "8 consolechars" "straight-to-font zone") ;; (find-udfile "console-tools/lct.txt.gz" "from U+F000 to U+F1FF") (defface eev-glyph-face-bluebg '((t (:background "blue"))) "Face used for the glyph for backspace (char 8; a solid blue box).") (defface eev-glyph-face-yellow-on-red '((t (:foreground "yellow" :background "red"))) "Face used for the formfeed glyph (char 12).") (defface eev-glyph-face-blue '((t (:foreground "blue"))) "Face used for the glyph for CR (char 13).") (defface eev-glyph-face-red '((t (:foreground "red"))) "Face used for the red star glyph (char 15).") (defface eev-glyph-face-bang '((t (:foreground "blue" :background "red"))) "Face used for the CSI glyph (char 128+27=155).") (defface eev-glyph-face-green '((((class color) (background dark)) (:foreground "green")) (((class color) (background light)) (:foreground "forest green")) (t (:bold t))) "Face used for the green glyphs (`<<' and `>>', chars 171 and 187).") ;; 2008feb23: Tentative support for unicode-2 emacs ;; (find-angg ".emacs" "find-glyphashtml-links") ;; (find-efunction 'make-glyph-code) ;; #x07ffff ;; #x3fffff ;; (defvar ee-glyph-shift (if (fboundp 'make-glyph-code) (round (log (/ (make-glyph-code 0 'bold) (face-id 'bold)) 2)) 19) "The offset (in bits) of the \"face\" part of a glyph. Should be 22 in unicode-2 emacs, 19 in pre-unicode-2 emacs.") (defun ee-glyph-char-mask () "The mask used to extract the \"char\" part of a glyph." (- (ash 1 ee-glyph-shift) 1)) ;; The demos are in the docstring, so run this: ;; (find-efunctiondescr 'ee-glyph) ;; (defun ee-glyph (char &optional face) "Convert CHAR and FACE to a number that can be used in a glyph. CHAR can be a number or a string (with length 1); FACE can be a face name (a symbol) or nil. See:\n (find-elnode \"Glyphs\") (find-elnode \"Display Tables\") (find-elnode \"Display Table Format\")\n Example:\n ;; Set the display table entry for the TAB char to the string \"<tab>\": (aset standard-display-table 9 [?< ?t ?a ?b ?>])\n ;; Make TAB chars normal again: (aset standard-display-table 9 nil)\n ;; Show TABs as the string \"<tab>\" with the `highlight' face: (aset standard-display-table 9 (vector (logior ?< (ash (face-id 'highlight) ee-glyph-shift)) (logior ?t (ash (face-id 'highlight) ee-glyph-shift)) (logior ?a (ash (face-id 'highlight) ee-glyph-shift)) (logior ?b (ash (face-id 'highlight) ee-glyph-shift)) (logior ?> (ash (face-id 'highlight) ee-glyph-shift))))\n ;; Make TAB chars normal again. (aset standard-display-table 9 nil)\n Using `ee-glyph' we can replace the \"(logior ...)\"s above by sexps like:\n (ee-glyph ?< 'highlight)" (if (stringp char) (setq char (string-to-char char))) (if (fboundp 'make-glyph-code) (make-glyph-code char face) (logior char (ash (if face (face-id face) 0) 19)))) ;; 2008feb27: 19 or `ee-glyph-shift'? ;; Can I assume that ee-glyph-shift is 19 when not (fboundp 'make-glyph-code)? ;; http://lists.gnu.org/archive/html/bug-gnu-emacs/2008-02/msg00132.html ;; Recent emacses have "cons glyphs" and this: ;; (find-efunction 'make-glyph-code) ;; 2013feb12 - see (find-TH "glyphs" "bug-report") (defun eev-set-glyph (pos &optional char face) (eepitch-set-glyph pos char face)) ' (defun eev-set-glyph (pos &optional char face) "Set a face glyph for the char at position POS in `standard-display-table'. If both CHAR and FACE are non-nil then display POS as CHAR with face FACE. If only CHAR is non-nil then display POS as CHAR with the default face. If both CHAR and FACE are nil then display POS in the default way. Use `let' to operate on another display table: (let ((standard-display-table my-display-table)) (eev-glyph-set ?\\^A ?A 'eev-glyph-face-red))" (aset standard-display-table pos (if char (vector (ee-glyph char face))))) (defun eev-set-default-glyphs () "Set the default glyphs for eev on `standard-display-table'. Note that the glyphs for \"«\" and \"»\" only work on raw-text or unibyte buffers." (or standard-display-table (setq standard-display-table (make-display-table))) (eev-set-glyph 8 32 'eev-glyph-face-bluebg) (eev-set-glyph 12 ?L 'eev-glyph-face-yellow-on-red) (eev-set-glyph 13 ?M 'eev-glyph-face-blue) (eev-set-glyph ?\^O ?* 'eev-glyph-face-red) (eev-set-glyph 155 ?! 'eev-glyph-face-bang) (eev-set-glyph ?« ?« 'eev-glyph-face-green) (eev-set-glyph ?» ?» 'eev-glyph-face-green)) (provide 'eev-glyphs) ;; The comments below are remnants of previous versions and should be ;; deleted soon. ;; (find-elnode "Association Lists") ;; (find-efile "") ;; (find-elnode "Display Tables") ;; (find-elnode "Glyphs") ;; (find-elnode "Active Display Table") ;; (find-elnode "Usual Display") ;; (find-efile "disp-table.el") ;; (find-evardescr 'glyph-table) ;; (find-evardescr 'buffer-display-table) ;; (find-fline "~/LATEX/dout/doutface.el") ;; (find-efile "term/tty-colors.el") ;; A first attempt to modernize the code above (2004oct21)... ;; (find-elnode "Defining Faces") ;; (find-efunctiondescr 'defface) ;; (find-efunction 'defface) ;; (find-efunction 'custom-declare-face) ;; (find-efile "generic-x.el" "(background light)") ;; ;; (defface glyphs-face-green ;; '((((class color) (background dark)) (:foreground "green")) ;; (((class color) (background light)) (:foreground "forest green")) ;; (t (:bold t))) ;; "Face for the glyphs `<<' and `>>'.") ;; ;; (eev "emacs -bg white -fg black ~/eev-current/glyphs.el &") ;; (eev "emacs -bg black -fg bisque ~/eev-current/glyphs.el &") ;; This is how I used to test the console codes for string glyphs: ;; (ee-write-string (glyphs-make-string "1;31;41" ?! nil) "/dev/tty3") ;; *›«» ;; Local Variables: ;; coding: raw-text-unix ;; ee-anchor-format: "defun %s " ;; End: