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+;;; rxvt.el --- define function key sequences and standard colors for rxvt
+
+;; Copyright (C) 2002 Free Software Foundation, Inc.
+
+;; Author: Eli Zaretskii
+;; Keywords: terminals
+
+;; 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:
+
+;;; Code:
+
+;; Set up function-key-map entries that termcap and terminfo don't know.
+(let ((map (make-sparse-keymap)))
+  (define-key map "\e[A" [up])
+  (define-key map "\e[B" [down])
+  (define-key map "\e[C" [right])
+  (define-key map "\e[D" [left])
+  (define-key map "\e[7~" [home])
+  (define-key map "\e[2~" [insert])
+  (define-key map "\e[3~" [delete])
+  (define-key map "\e[4~" [select])
+  (define-key map "\e[5~" [prior])
+  (define-key map "\e[6~" [next])
+  (define-key map "\e[11~" [f1])
+  (define-key map "\e[12~" [f2])
+  (define-key map "\e[13~" [f3])
+  (define-key map "\e[14~" [f4])
+  (define-key map "\e[15~" [f5])
+  (define-key map "\e[17~" [f6])
+  (define-key map "\e[18~" [f7])
+  (define-key map "\e[19~" [f8])
+  (define-key map "\e[20~" [f9])
+  (define-key map "\e[21~" [f10])
+  (define-key map "\e[23~" [f11])
+  (define-key map "\e[24~" [f12])
+  (define-key map "\e[29~" [print])
+
+  (define-key map "\e[11^" [C-f1])
+  (define-key map "\e[12^" [C-f2])
+  (define-key map "\e[13^" [C-f3])
+  (define-key map "\e[14^" [C-f4])
+  (define-key map "\e[15^" [C-f5])
+  (define-key map "\e[17^" [C-f6])
+  (define-key map "\e[18^" [C-f7])
+  (define-key map "\e[19^" [C-f8])
+  (define-key map "\e[20^" [C-f9])
+  (define-key map "\e[21^" [C-f10])
+  (define-key map "\e[23^" [C-f11])
+  (define-key map "\e[24^" [C-f12])
+
+  (define-key map "\e[29~" [print])
+
+  (define-key map "\e[2;2~" [S-insert])
+  (define-key map "\e[3$" [S-delete])
+
+  (define-key map "\e[2^" [C-insert])
+  (define-key map "\e[3^" [C-delete])
+  (define-key map "\e[5^" [C-prior])
+  (define-key map "\e[6^" [C-next])
+  (define-key map "\eOd" [C-left])
+  (define-key map "\eOc" [C-right])
+  (define-key map "\eOa" [C-up])
+  (define-key map "\eOb" [C-down])
+ 
+  (define-key map "\e[5$" [S-prior])
+  (define-key map "\e[6$" [S-next])
+  (define-key map "\e[8$" [S-end])
+  (define-key map "\e[7$" [S-home])
+  (define-key map "\e[d" [S-left])
+  (define-key map "\e[c" [S-right])
+  (define-key map "\e[a" [S-up])
+  (define-key map "\e[b" [S-down])
+
+  ;; Use inheritance to let the main keymap override those defaults.
+  ;; This way we don't override terminfo-derived settings or settings
+  ;; made in the .emacs file.
+  (set-keymap-parent map (keymap-parent function-key-map))
+  (set-keymap-parent function-key-map map))
+
+;; Set up colors, for those versions of rxvt that support it.
+(defvar rxvt-standard-colors
+  ;; The names of the colors in the comments taken from the rxvt.1 man
+  ;; page; th corresponding RGB values--from rgb.txt.
+  '(("black"          0 (  0   0   0))  ; black
+    ("red"            1 (205   0   0))  ; red3
+    ("green"          2 (  0 205   0))  ; green3
+    ("yellow"         3 (205 205   0))  ; yellow3
+    ("blue"           4 (  0   0 205))  ; blue3
+    ("magenta"        5 (205   0 205))  ; magenta3
+    ("cyan"           6 (  0 205 205))  ; cyan3
+    ("white"          7 (250 235 215))  ; AntiqueWhite
+    ("brightblack"    8 ( 64  64  64))  ; gray25
+    ("brightred"      9 (255   0   0))  ; red
+    ("brightgreen"   10 (  0 255   0))  ; green
+    ("brightyellow"  11 (255 255   0))  ; yellow
+    ("brightblue"    12 (  0   0 255))  ; blue
+    ("brightmagenta" 13 (255   0 255))  ; magenta
+    ("brightcyan"    14 (  0 255 255))  ; cyan
+    ("brightwhite"   15 (255 255 255))) ; white
+  "Names of 16 standard rxvt colors, their numbers, and RGB values.")
+
+(defun rxvt-rgb-convert-to-16bit (prim)
+  "Convert an 8-bit primary color value PRIM to a corresponding 16-bit value."
+  (min 65535 (round (* (/ prim 255.0) 65535.0))))
+
+(defun rxvt-register-default-colors ()
+  "Register the default set of colors for rxvt or compatible emulator.
+
+This function registers the number of colors returned by `display-color-cells'
+for the currently selected frame."
+  (let* ((ncolors (display-color-cells))
+         (colors rxvt-standard-colors)
+         (color (car colors)))
+    (if (> ncolors 0)
+        ;; Clear the 8 default tty colors registered by startup.el
+        (tty-color-clear))
+    ;; Only register as many colors as are supported by the display.
+    (while (and (> ncolors 0) colors)
+      (tty-color-define (car color) (cadr color)
+                        (mapcar 'rxvt-rgb-convert-to-16bit
+                                (car (cddr color))))
+      (setq colors (cdr colors)
+            color (car colors)
+            ncolors (1- ncolors)))
+    ;; Modifying color mappings means realized faces don't use the
+    ;; right colors, so clear them.
+    (clear-face-cache)))
+
+;; rxvt puts the default colors into an environment variable
+;; COLORFGBG.  We use this to set the background mode in a more
+;; intelligent way than the default guesswork in startup.el.
+(defun rxvt-set-background-mode ()
+  "Set background mode as appropriate for the default rxvt colors."
+  (let ((fgbg (getenv "COLORFGBG"))
+        bg rgb)
+    (setq frame-background-mode 'light) ; default
+    (when (and fgbg
+               (string-match ".*;\\([0-9][0-9]?\\)\\'" fgbg))
+      (setq bg (string-to-number (substring fgbg (match-beginning 1))))
+      ;; The next line assumes that rxvt-standard-colors are ordered
+      ;; by the color index in the ascending order!
+      (setq rgb (car (cddr (nth bg rxvt-standard-colors))))
+      ;; See the commentary in frame-set-background-mode about the
+      ;; computation below.
+      (if (< (apply '+ rgb)
+             ;; The following line assumes that white is the 15th
+             ;; color in rxvt-standard-colors.
+             (* (apply '+ (car (cddr (nth 15 rxvt-standard-colors)))) 0.6))
+          (setq frame-background-mode 'dark)))
+    (frame-set-background-mode (selected-frame))))
+
+;; Do it!
+(rxvt-register-default-colors)
+(rxvt-set-background-mode)
+;; This recomputes all the default faces given the colors we've just set up.
+(tty-set-up-initial-frame-faces)
+
+;;; rxvt.el ends here