code.delx.au - gnu-emacs/blob - lisp/term/xterm.el

   1 ;;; xterm.el --- define function key sequences and standard colors for xterm  -*- lexical-binding: t -*-
   2
   3 ;; Copyright (C) 1995, 2001-2014 Free Software Foundation, Inc.
   4
   5 ;; Author: FSF
   6 ;; Keywords: terminals
   7
   8 ;; This file is part of GNU Emacs.
   9
  10 ;; GNU Emacs is free software: you can redistribute it and/or modify
  11 ;; it under the terms of the GNU General Public License as published by
  12 ;; the Free Software Foundation, either version 3 of the License, or
  13 ;; (at your option) any later version.
  14
  15 ;; GNU Emacs is distributed in the hope that it will be useful,
  16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 ;; GNU General Public License for more details.
  19
  20 ;; You should have received a copy of the GNU General Public License
  21 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  22
  23 ;;; Commentary:
  24
  25 ;;; Code:
  26
  27 (defgroup xterm nil
  28   "XTerm support."
  29   :version "24.1"
  30   :group 'terminals)
  31
  32 (defcustom xterm-extra-capabilities 'check
  33   "Whether Xterm supports some additional, more modern, features.
  34 If nil, just assume that it does not.
  35 If `check', try to check if it does.
  36 If a list, assume that the listed features are supported, without checking.
  37
  38 The relevant features are:
  39   modifyOtherKeys  -- if supported, more key bindings work (e.g., \"\\C-,\")
  40   reportBackground -- if supported, Xterm reports its background color"
  41   :version "24.1"
  42   :group 'xterm
  43   :type '(choice (const :tag "No" nil)
  44                  (const :tag "Check" check)
  45                  ;; NOTE: If you add entries here, make sure to update
  46                  ;; `terminal-init-xterm' as well.
  47                  (set (const :tag "modifyOtherKeys support" modifyOtherKeys)
  48                       (const :tag "report background" reportBackground))))
  49
  50 (defconst xterm-paste-ending-sequence "\e[201~"
  51   "Characters send by the terminal to end a bracketed paste.")
  52
  53 (defun xterm-paste ()
  54   "Handle the start of a terminal paste operation."
  55   (interactive)
  56   (let* ((end-marker-length (length xterm-paste-ending-sequence))
  57          (pasted-text (with-temp-buffer
  58                         (set-buffer-multibyte nil)
  59                         (while (not (search-backward
  60                                      xterm-paste-ending-sequence
  61                                      (- (point) end-marker-length) t))
  62                           (let ((event (read-event)))
  63                             (when (eql event ?\r)
  64                               (setf event ?\n))
  65                             (insert event)))
  66                         (let ((last-coding-system-used))
  67                           (decode-coding-region
  68                            (point-min) (point)
  69                            (keyboard-coding-system) t))))
  70          (interprogram-paste-function (lambda () pasted-text)))
  71     (yank)))
  72
  73 (define-key global-map [xterm-paste] #'xterm-paste)
  74
  75 (defvar xterm-function-map
  76   (let ((map (make-sparse-keymap)))
  77
  78     ;; xterm from X.org 6.8.2 uses these key definitions.
  79     (define-key map "\eOP" [f1])
  80     (define-key map "\eOQ" [f2])
  81     (define-key map "\eOR" [f3])
  82     (define-key map "\eOS" [f4])
  83     (define-key map "\e[15~" [f5])
  84     (define-key map "\e[17~" [f6])
  85     (define-key map "\e[18~" [f7])
  86     (define-key map "\e[19~" [f8])
  87     (define-key map "\e[20~" [f9])
  88     (define-key map "\e[21~" [f10])
  89     (define-key map "\e[23~" [f11])
  90     (define-key map "\e[24~" [f12])
  91
  92     (define-key map "\eO2P" [S-f1])
  93     (define-key map "\eO2Q" [S-f2])
  94     (define-key map "\eO2R" [S-f3])
  95     (define-key map "\eO2S" [S-f4])
  96     (define-key map "\e[1;2P" [S-f1])
  97     (define-key map "\e[1;2Q" [S-f2])
  98     (define-key map "\e[1;2R" [S-f3])
  99     (define-key map "\e[1;2S" [S-f4])
 100     (define-key map "\e[15;2~" [S-f5])
 101     (define-key map "\e[17;2~" [S-f6])
 102     (define-key map "\e[18;2~" [S-f7])
 103     (define-key map "\e[19;2~" [S-f8])
 104     (define-key map "\e[20;2~" [S-f9])
 105     (define-key map "\e[21;2~" [S-f10])
 106     (define-key map "\e[23;2~" [S-f11])
 107     (define-key map "\e[24;2~" [S-f12])
 108
 109     (define-key map "\eO5P" [C-f1])
 110     (define-key map "\eO5Q" [C-f2])
 111     (define-key map "\eO5R" [C-f3])
 112     (define-key map "\eO5S" [C-f4])
 113     (define-key map "\e[15;5~" [C-f5])
 114     (define-key map "\e[17;5~" [C-f6])
 115     (define-key map "\e[18;5~" [C-f7])
 116     (define-key map "\e[19;5~" [C-f8])
 117     (define-key map "\e[20;5~" [C-f9])
 118     (define-key map "\e[21;5~" [C-f10])
 119     (define-key map "\e[23;5~" [C-f11])
 120     (define-key map "\e[24;5~" [C-f12])
 121
 122     (define-key map "\eO6P" [C-S-f1])
 123     (define-key map "\eO6Q" [C-S-f2])
 124     (define-key map "\eO6R" [C-S-f3])
 125     (define-key map "\eO6S" [C-S-f4])
 126     (define-key map "\e[15;6~" [C-S-f5])
 127     (define-key map "\e[17;6~" [C-S-f6])
 128     (define-key map "\e[18;6~" [C-S-f7])
 129     (define-key map "\e[19;6~" [C-S-f8])
 130     (define-key map "\e[20;6~" [C-S-f9])
 131     (define-key map "\e[21;6~" [C-S-f10])
 132     (define-key map "\e[23;6~" [C-S-f11])
 133     (define-key map "\e[24;6~" [C-S-f12])
 134
 135     (define-key map "\eO3P" [M-f1])
 136     (define-key map "\eO3Q" [M-f2])
 137     (define-key map "\eO3R" [M-f3])
 138     (define-key map "\eO3S" [M-f4])
 139     (define-key map "\e[15;3~" [M-f5])
 140     (define-key map "\e[17;3~" [M-f6])
 141     (define-key map "\e[18;3~" [M-f7])
 142     (define-key map "\e[19;3~" [M-f8])
 143     (define-key map "\e[20;3~" [M-f9])
 144     (define-key map "\e[21;3~" [M-f10])
 145     (define-key map "\e[23;3~" [M-f11])
 146     (define-key map "\e[24;3~" [M-f12])
 147
 148     (define-key map "\eO4P" [M-S-f1])
 149     (define-key map "\eO4Q" [M-S-f2])
 150     (define-key map "\eO4R" [M-S-f3])
 151     (define-key map "\eO4S" [M-S-f4])
 152     (define-key map "\e[15;4~" [M-S-f5])
 153     (define-key map "\e[17;4~" [M-S-f6])
 154     (define-key map "\e[18;4~" [M-S-f7])
 155     (define-key map "\e[19;4~" [M-S-f8])
 156     (define-key map "\e[20;4~" [M-S-f9])
 157     (define-key map "\e[21;4~" [M-S-f10])
 158     (define-key map "\e[23;4~" [M-S-f11])
 159     (define-key map "\e[24;4~" [M-S-f12])
 160
 161     (define-key map "\eOA" [up])
 162     (define-key map "\eOB" [down])
 163     (define-key map "\eOC" [right])
 164     (define-key map "\eOD" [left])
 165     (define-key map "\eOF" [end])
 166     (define-key map "\eOH" [home])
 167
 168     (define-key map "\e[1;2A" [S-up])
 169     (define-key map "\e[1;2B" [S-down])
 170     (define-key map "\e[1;2C" [S-right])
 171     (define-key map "\e[1;2D" [S-left])
 172     (define-key map "\e[1;2F" [S-end])
 173     (define-key map "\e[1;2H" [S-home])
 174
 175     (define-key map "\e[1;4A" [M-S-up])
 176     (define-key map "\e[1;4B" [M-S-down])
 177     (define-key map "\e[1;4C" [M-S-right])
 178     (define-key map "\e[1;4D" [M-S-left])
 179     (define-key map "\e[1;4F" [M-S-end])
 180     (define-key map "\e[1;4H" [M-S-home])
 181
 182     (define-key map "\e[1;5A" [C-up])
 183     (define-key map "\e[1;5B" [C-down])
 184     (define-key map "\e[1;5C" [C-right])
 185     (define-key map "\e[1;5D" [C-left])
 186     (define-key map "\e[1;5F" [C-end])
 187     (define-key map "\e[1;5H" [C-home])
 188
 189     (define-key map "\e[1;6A" [C-S-up])
 190     (define-key map "\e[1;6B" [C-S-down])
 191     (define-key map "\e[1;6C" [C-S-right])
 192     (define-key map "\e[1;6D" [C-S-left])
 193     (define-key map "\e[1;6F" [C-S-end])
 194     (define-key map "\e[1;6H" [C-S-home])
 195
 196     (define-key map "\e[1;7A" [C-M-up])
 197     (define-key map "\e[1;7B" [C-M-down])
 198     (define-key map "\e[1;7C" [C-M-right])
 199     (define-key map "\e[1;7D" [C-M-left])
 200     (define-key map "\e[1;7F" [C-M-end])
 201     (define-key map "\e[1;7H" [C-M-home])
 202
 203     (define-key map "\e[1;8A" [C-M-S-up])
 204     (define-key map "\e[1;8B" [C-M-S-down])
 205     (define-key map "\e[1;8C" [C-M-S-right])
 206     (define-key map "\e[1;8D" [C-M-S-left])
 207     (define-key map "\e[1;8F" [C-M-S-end])
 208     (define-key map "\e[1;8H" [C-M-S-home])
 209
 210     (define-key map "\e[1;3A" [M-up])
 211     (define-key map "\e[1;3B" [M-down])
 212     (define-key map "\e[1;3C" [M-right])
 213     (define-key map "\e[1;3D" [M-left])
 214     (define-key map "\e[1;3F" [M-end])
 215     (define-key map "\e[1;3H" [M-home])
 216
 217     (define-key map "\e[2~" [insert])
 218     (define-key map "\e[3~" [delete])
 219     (define-key map "\e[5~" [prior])
 220     (define-key map "\e[6~" [next])
 221
 222     (define-key map "\e[2;2~" [S-insert])
 223     (define-key map "\e[3;2~" [S-delete])
 224     (define-key map "\e[5;2~" [S-prior])
 225     (define-key map "\e[6;2~" [S-next])
 226
 227     (define-key map "\e[2;4~" [M-S-insert])
 228     (define-key map "\e[3;4~" [M-S-delete])
 229     (define-key map "\e[5;4~" [M-S-prior])
 230     (define-key map "\e[6;4~" [M-S-next])
 231
 232     (define-key map "\e[2;5~" [C-insert])
 233     (define-key map "\e[3;5~" [C-delete])
 234     (define-key map "\e[5;5~" [C-prior])
 235     (define-key map "\e[6;5~" [C-next])
 236
 237     (define-key map "\e[2;6~" [C-S-insert])
 238     (define-key map "\e[3;6~" [C-S-delete])
 239     (define-key map "\e[5;6~" [C-S-prior])
 240     (define-key map "\e[6;6~" [C-S-next])
 241
 242     (define-key map "\e[2;7~" [C-M-insert])
 243     (define-key map "\e[3;7~" [C-M-delete])
 244     (define-key map "\e[5;7~" [C-M-prior])
 245     (define-key map "\e[6;7~" [C-M-next])
 246
 247     (define-key map "\e[2;8~" [C-M-S-insert])
 248     (define-key map "\e[3;8~" [C-M-S-delete])
 249     (define-key map "\e[5;8~" [C-M-S-prior])
 250     (define-key map "\e[6;8~" [C-M-S-next])
 251
 252     (define-key map "\e[2;3~" [M-insert])
 253     (define-key map "\e[3;3~" [M-delete])
 254     (define-key map "\e[5;3~" [M-prior])
 255     (define-key map "\e[6;3~" [M-next])
 256
 257     (define-key map "\e[4~" [select])
 258     (define-key map "\e[29~" [print])
 259
 260     (define-key map "\eOj" [kp-multiply])
 261     (define-key map "\eOk" [kp-add])
 262     (define-key map "\eOl" [kp-separator])
 263     (define-key map "\eOm" [kp-subtract])
 264     (define-key map "\eOo" [kp-divide])
 265     (define-key map "\eOp" [kp-0])
 266     (define-key map "\eOq" [kp-1])
 267     (define-key map "\eOr" [kp-2])
 268     (define-key map "\eOs" [kp-3])
 269     (define-key map "\eOt" [kp-4])
 270     (define-key map "\eOu" [kp-5])
 271     (define-key map "\eOv" [kp-6])
 272     (define-key map "\eOw" [kp-7])
 273     (define-key map "\eOx" [kp-8])
 274     (define-key map "\eOy" [kp-9])
 275
 276     ;; These keys are available in xterm starting from version 216
 277     ;; if the modifyOtherKeys resource is set to 1.
 278     (dolist (bind '((5 9   [C-tab])
 279                     (5 13  [C-return])
 280                     (5 39  [?\C-\'])
 281                     (5 44  [?\C-,])
 282                     (5 45  [?\C--])
 283                     (5 46  [?\C-.])
 284                     (5 47  [?\C-/])
 285                     (5 48  [?\C-0])
 286                     (5 49  [?\C-1])
 287                     ;; Not all C-DIGIT keys have a distinct binding.
 288                     (5 57  [?\C-9])
 289                     (5 59  [?\C-\;])
 290                     (5 61  [?\C-=])
 291                     (5 92  [?\C-\\])
 292
 293                     (6 33  [?\C-!])
 294                     (6 34  [?\C-\"])
 295                     (6 35  [?\C-#])
 296                     (6 36  [?\C-$])
 297                     (6 37  [?\C-%])
 298                     (6 38  [?\C-&])
 299                     (6 40  [?\C-\(])
 300                     (6 41  [?\C-\)])
 301                     (6 42  [?\C-*])
 302                     (6 43  [?\C-+])
 303                     (6 58  [?\C-:])
 304                     (6 60  [?\C-<])
 305                     (6 62  [?\C->])
 306                     (6 63  [(control ??)])
 307
 308                     ;; These are the strings emitted for various C-M-
 309                     ;; combinations for keyboards whose Meta and Alt
 310                     ;; modifiers are on the same key (usually labeled "Alt").
 311                     (13 9  [C-M-tab])
 312                     (13 13 [C-M-return])
 313
 314                     (13 39 [?\C-\M-\'])
 315                     (13 44 [?\C-\M-,])
 316                     (13 45 [?\C-\M--])
 317                     (13 46 [?\C-\M-.])
 318                     (13 47 [?\C-\M-/])
 319                     (13 48 [?\C-\M-0])
 320                     (13 49 [?\C-\M-1])
 321                     (13 50 [?\C-\M-2])
 322                     (13 51 [?\C-\M-3])
 323                     (13 52 [?\C-\M-4])
 324                     (13 53 [?\C-\M-5])
 325                     (13 54 [?\C-\M-6])
 326                     (13 55 [?\C-\M-7])
 327                     (13 56 [?\C-\M-8])
 328                     (13 57 [?\C-\M-9])
 329                     (13 59 [?\C-\M-\;])
 330                     (13 61 [?\C-\M-=])
 331                     (13 92 [?\C-\M-\\])
 332
 333                     (14 33  [?\C-\M-!])
 334                     (14 34  [?\C-\M-\"])
 335                     (14 35  [?\C-\M-#])
 336                     (14 36  [?\C-\M-$])
 337                     (14 37  [?\C-\M-%])
 338                     (14 38  [?\C-\M-&])
 339                     (14 40  [?\C-\M-\(])
 340                     (14 41  [?\C-\M-\)])
 341                     (14 42  [?\C-\M-*])
 342                     (14 43  [?\C-\M-+])
 343                     (14 58  [?\C-\M-:])
 344                     (14 60  [?\C-\M-<])
 345                     (14 62  [?\C-\M->])
 346                     (14 63  [(control meta ??)])
 347
 348                     (7 9  [C-M-tab])
 349                     (7 13 [C-M-return])
 350
 351                     (7 32 [?\C-\M-\s])
 352                     (7 39 [?\C-\M-\'])
 353                     (7 44 [?\C-\M-,])
 354                     (7 45 [?\C-\M--])
 355                     (7 46 [?\C-\M-.])
 356                     (7 47 [?\C-\M-/])
 357                     (7 48 [?\C-\M-0])
 358                     (7 49 [?\C-\M-1])
 359                     (7 50 [?\C-\M-2])
 360                     (7 51 [?\C-\M-3])
 361                     (7 52 [?\C-\M-4])
 362                     (7 53 [?\C-\M-5])
 363                     (7 54 [?\C-\M-6])
 364                     (7 55 [?\C-\M-7])
 365                     (7 56 [?\C-\M-8])
 366                     (7 57 [?\C-\M-9])
 367                     (7 59 [?\C-\M-\;])
 368                     (7 61 [?\C-\M-=])
 369                     (7 92 [?\C-\M-\\])
 370
 371                     (8 33  [?\C-\M-!])
 372                     (8 34  [?\C-\M-\"])
 373                     (8 35  [?\C-\M-#])
 374                     (8 36  [?\C-\M-$])
 375                     (8 37  [?\C-\M-%])
 376                     (8 38  [?\C-\M-&])
 377                     (8 40  [?\C-\M-\(])
 378                     (8 41  [?\C-\M-\)])
 379                     (8 42  [?\C-\M-*])
 380                     (8 43  [?\C-\M-+])
 381                     (8 58  [?\C-\M-:])
 382                     (8 60  [?\C-\M-<])
 383                     (8 62  [?\C-\M->])
 384                     (8 63  [(control meta ??)])
 385
 386                     (2 9   [S-tab])
 387                     (2 13  [S-return])
 388
 389                     (6 9   [C-S-tab])
 390                     (6 13  [C-S-return])))
 391       (define-key map
 392         (format "\e[27;%d;%d~" (nth 0 bind) (nth 1 bind)) (nth 2 bind))
 393       ;; For formatOtherKeys=1, the sequence is a bit shorter (bug#13839).
 394       (define-key map
 395         (format "\e[%d;%du" (nth 1 bind) (nth 0 bind)) (nth 2 bind)))
 396
 397     ;; Other versions of xterm might emit these.
 398     (define-key map "\e[A" [up])
 399     (define-key map "\e[B" [down])
 400     (define-key map "\e[C" [right])
 401     (define-key map "\e[D" [left])
 402     (define-key map "\e[1~" [home])
 403
 404     (define-key map "\eO2A" [S-up])
 405     (define-key map "\eO2B" [S-down])
 406     (define-key map "\eO2C" [S-right])
 407     (define-key map "\eO2D" [S-left])
 408     (define-key map "\eO2F" [S-end])
 409     (define-key map "\eO2H" [S-home])
 410
 411     (define-key map "\eO5A" [C-up])
 412     (define-key map "\eO5B" [C-down])
 413     (define-key map "\eO5C" [C-right])
 414     (define-key map "\eO5D" [C-left])
 415     (define-key map "\eO5F" [C-end])
 416     (define-key map "\eO5H" [C-home])
 417
 418     (define-key map "\e[11~" [f1])
 419     (define-key map "\e[12~" [f2])
 420     (define-key map "\e[13~" [f3])
 421     (define-key map "\e[14~" [f4])
 422
 423     ;; Recognize the start of a bracketed paste sequence.  The handler
 424     ;; internally recognizes the end.
 425     (define-key map "\e[200~" [xterm-paste])
 426
 427     map)
 428   "Function key map overrides for xterm.")
 429
 430 (defvar xterm-alternatives-map
 431   (let ((map (make-sparse-keymap)))
 432     ;; The terminal initialization C code file might have initialized
 433     ;; function keys F13->F60 from the termcap/terminfo information.
 434     ;; On a PC-style keyboard these keys correspond to
 435     ;; MODIFIER-FUNCTION_KEY, where modifier is S-, C, A-, C-S-.  The code
 436     ;; here substitutes the corresponding definitions in function-key-map.
 437     ;; The mapping from escape sequences to Fn is done in input-decode-map
 438     ;; whereas this here mapping is done in local-function-key-map so that
 439     ;; bindings to f45 still work, in case your keyboard really has an f45
 440     ;; key rather than C-S-f9.
 441     (define-key map [f13] [S-f1])
 442     (define-key map [f14] [S-f2])
 443     (define-key map [f15] [S-f3])
 444     (define-key map [f16] [S-f4])
 445     (define-key map [f17] [S-f5])
 446     (define-key map [f18] [S-f6])
 447     (define-key map [f19] [S-f7])
 448     (define-key map [f20] [S-f8])
 449     (define-key map [f21] [S-f9])
 450     (define-key map [f22] [S-f10])
 451     (define-key map [f23] [S-f11])
 452     (define-key map [f24] [S-f12])
 453
 454     (define-key map [f25] [C-f1])
 455     (define-key map [f26] [C-f2])
 456     (define-key map [f27] [C-f3])
 457     (define-key map [f28] [C-f4])
 458     (define-key map [f29] [C-f5])
 459     (define-key map [f30] [C-f6])
 460     (define-key map [f31] [C-f7])
 461     (define-key map [f32] [C-f8])
 462     (define-key map [f33] [C-f9])
 463     (define-key map [f34] [C-f10])
 464     (define-key map [f35] [C-f11])
 465     (define-key map [f36] [C-f12])
 466
 467     (define-key map [f37] [C-S-f1])
 468     (define-key map [f38] [C-S-f2])
 469     (define-key map [f39] [C-S-f3])
 470     (define-key map [f40] [C-S-f4])
 471     (define-key map [f41] [C-S-f5])
 472     (define-key map [f42] [C-S-f6])
 473     (define-key map [f43] [C-S-f7])
 474     (define-key map [f44] [C-S-f8])
 475     (define-key map [f45] [C-S-f9])
 476     (define-key map [f46] [C-S-f10])
 477     (define-key map [f47] [C-S-f11])
 478     (define-key map [f48] [C-S-f12])
 479
 480     (define-key map [f49] [M-f1])
 481     (define-key map [f50] [M-f2])
 482     (define-key map [f51] [M-f3])
 483     (define-key map [f52] [M-f4])
 484     (define-key map [f53] [M-f5])
 485     (define-key map [f54] [M-f6])
 486     (define-key map [f55] [M-f7])
 487     (define-key map [f56] [M-f8])
 488     (define-key map [f57] [M-f9])
 489     (define-key map [f58] [M-f10])
 490     (define-key map [f59] [M-f11])
 491     (define-key map [f60] [M-f12])
 492
 493     map)
 494   "Keymap of possible alternative meanings for some keys.")
 495
 496 (defun xterm--report-background-handler ()
 497   (let ((str "")
 498         chr)
 499     ;; The reply should be: \e ] 11 ; rgb: NUMBER1 / NUMBER2 / NUMBER3 \e \\
 500     (while (and (setq chr (read-event nil nil 2)) (not (equal chr ?\\)))
 501       (setq str (concat str (string chr))))
 502     (when (string-match
 503            "rgb:\\([a-f0-9]+\\)/\\([a-f0-9]+\\)/\\([a-f0-9]+\\)" str)
 504       (let ((recompute-faces
 505              (xterm-maybe-set-dark-background-mode
 506               (string-to-number (match-string 1 str) 16)
 507               (string-to-number (match-string 2 str) 16)
 508               (string-to-number (match-string 3 str) 16))))
 509
 510         ;; Recompute faces here in case the background mode was
 511         ;; set to dark.  We used to call
 512         ;; `tty-set-up-initial-frame-faces' only once, but that
 513         ;; caused the light background faces to be computed
 514         ;; incorrectly.  See:
 515         ;; http://permalink.gmane.org/gmane.emacs.devel/119627
 516         (when recompute-faces
 517           (tty-set-up-initial-frame-faces))))))
 518
 519 (defun xterm--version-handler ()
 520   (let ((str "")
 521         chr)
 522     ;; The reply should be: \e [ > NUMBER1 ; NUMBER2 ; NUMBER3 c
 523     ;; If the timeout is completely removed for read-event, this
 524     ;; might hang for terminals that pretend to be xterm, but don't
 525     ;; respond to this escape sequence.  RMS' opinion was to remove
 526     ;; it completely.  That might be right, but let's first try to
 527     ;; see if by using a longer timeout we get rid of most issues.
 528     (while (and (setq chr (read-event nil nil 2)) (not (equal chr ?c)))
 529       (setq str (concat str (string chr))))
 530     ;; Since xterm-280, the terminal type (NUMBER1) is now 41 instead of 0.
 531     (when (string-match "\\([0-9]+\\);\\([0-9]+\\);0" str)
 532       (let ((version (string-to-number (match-string 2 str))))
 533         ;; If version is 242 or higher, assume the xterm supports
 534         ;; reporting the background color (TODO: maybe earlier
 535         ;; versions do too...)
 536         (when (>= version 242)
 537           (xterm--query "\e]11;?\e\\"
 538                         '(("\e]11;" .  xterm--report-background-handler))))
 539
 540         ;; If version is 216 (the version when modifyOtherKeys was
 541         ;; introduced) or higher, initialize the
 542         ;; modifyOtherKeys support.
 543         (when (>= version 216)
 544           (terminal-init-xterm-modify-other-keys))))))
 545
 546 (defun xterm--query (query handlers)
 547   "Send QUERY string to the terminal and watch for a response.
 548 HANDLERS is an alist with elements of the form (STRING . FUNCTION).
 549 We run the first FUNCTION whose STRING matches the input events."
 550   ;; We used to query synchronously, but the need to use `discard-input' is
 551   ;; rather annoying (bug#6758).  Maybe we could always use the asynchronous
 552   ;; approach, but it's less tested.
 553   ;; FIXME: Merge the two branches.
 554   (if (input-pending-p)
 555       (progn
 556         (dolist (handler handlers)
 557           (define-key input-decode-map (car handler)
 558             (lambda (&optional _prompt)
 559               ;; Unregister the handler, since we don't expect further answers.
 560               (dolist (handler handlers)
 561                 (define-key input-decode-map (car handler) nil))
 562               (funcall (cdr handler))
 563               [])))
 564         (send-string-to-terminal query))
 565     ;; Pending input can be mistakenly returned by the calls to
 566     ;; read-event below.  Discard it.
 567     (send-string-to-terminal query)
 568     (while handlers
 569       (let ((handler (pop handlers))
 570             (i 0))
 571         (while (and (< i (length (car handler)))
 572                     (let ((evt (read-event nil nil 2)))
 573                       (or (eq evt (aref (car handler) i))
 574                           (progn (if evt (push evt unread-command-events))
 575                                  nil))))
 576           (setq i (1+ i)))
 577         (if (= i (length (car handler)))
 578             (progn (setq handlers nil)
 579                    (funcall (cdr handler)))
 580           (while (> i 0)
 581             (push (aref (car handler) (setq i (1- i)))
 582                   unread-command-events)))))))
 583
 584 (defun terminal-init-xterm ()
 585   "Terminal initialization function for xterm."
 586   ;; rxvt terminals sometimes set the TERM variable to "xterm", but
 587   ;; rxvt's keybindings are incompatible with xterm's. It is
 588   ;; better in that case to use rxvt's initialization function.
 589   (if (and (getenv "COLORTERM" (selected-frame))
 590            (string-match "\\`rxvt" (getenv "COLORTERM" (selected-frame))))
 591       (tty-run-terminal-initialization (selected-frame) "rxvt")
 592
 593     (let ((map (copy-keymap xterm-alternatives-map)))
 594       (set-keymap-parent map (keymap-parent local-function-key-map))
 595       (set-keymap-parent local-function-key-map map))
 596
 597     (let ((map (copy-keymap xterm-function-map)))
 598
 599       ;; Use inheritance to let the main keymap override those defaults.
 600       ;; This way we don't override terminfo-derived settings or settings
 601       ;; made in the init file.
 602       (set-keymap-parent map (keymap-parent input-decode-map))
 603       (set-keymap-parent input-decode-map map)))
 604
 605   (xterm-register-default-colors)
 606   (tty-set-up-initial-frame-faces)
 607
 608   (if (eq xterm-extra-capabilities 'check)
 609       ;; Try to find out the type of terminal by sending a "Secondary
 610       ;; Device Attributes (DA)" query.
 611       (xterm--query "\e[>0c"
 612                     ;; Some terminals (like OS X's Terminal.app) respond to
 613                     ;; this query as if it were a "Primary Device Attributes"
 614                     ;; query instead, so we should handle that too.
 615                     '(("\e[?" . xterm--version-handler)
 616                       ("\e[>" . xterm--version-handler)))
 617
 618     (when (memq 'reportBackground xterm-extra-capabilities)
 619       (xterm--query "\e]11;?\e\\"
 620                     '(("\e]11;" .  xterm--report-background-handler))))
 621
 622     (when (memq 'modifyOtherKeys xterm-extra-capabilities)
 623       (terminal-init-xterm-modify-other-keys)))
 624
 625   ;; Unconditionally enable bracketed paste mode: terminals that don't
 626   ;; support it just ignore the sequence.
 627   (terminal-init-xterm-bracketed-paste-mode)
 628
 629   (run-hooks 'terminal-init-xterm-hook))
 630
 631 (defun terminal-init-xterm-modify-other-keys ()
 632   "Terminal initialization for xterm's modifyOtherKeys support."
 633   (send-string-to-terminal "\e[>4;1m")
 634   (push "\e[>4m" (terminal-parameter nil 'tty-mode-reset-strings))
 635   (push "\e[>4;1m" (terminal-parameter nil 'tty-mode-set-strings)))
 636
 637 (defun terminal-init-xterm-bracketed-paste-mode ()
 638   "Terminal initialization for bracketed paste mode."
 639   (send-string-to-terminal "\e[?2004h")
 640   (push "\e[?2004l" (terminal-parameter nil 'tty-mode-reset-strings))
 641   (push "\e[?2004h" (terminal-parameter nil 'tty-mode-set-strings)))
 642
 643 ;; Set up colors, for those versions of xterm that support it.
 644 (defvar xterm-standard-colors
 645   ;; The names in the comments taken from XTerm-col.ad in the xterm
 646   ;; distribution, see ftp://dickey.his.com/xterm/.  RGB values are
 647   ;; from rgb.txt.
 648   '(("black"          0 (  0   0   0))  ; black
 649     ("red"            1 (205   0   0))  ; red3
 650     ("green"          2 (  0 205   0))  ; green3
 651     ("yellow"         3 (205 205   0))  ; yellow3
 652     ("blue"           4 (  0   0 238))  ; blue2
 653     ("magenta"        5 (205   0 205))  ; magenta3
 654     ("cyan"           6 (  0 205 205))  ; cyan3
 655     ("white"          7 (229 229 229))  ; gray90
 656     ("brightblack"    8 (127 127 127))  ; gray50
 657     ("brightred"      9 (255   0   0))  ; red
 658     ("brightgreen"   10 (  0 255   0))  ; green
 659     ("brightyellow"  11 (255 255   0))  ; yellow
 660     ("brightblue"    12 (92   92 255))  ; rgb:5c/5c/ff
 661     ("brightmagenta" 13 (255   0 255))  ; magenta
 662     ("brightcyan"    14 (  0 255 255))  ; cyan
 663     ("brightwhite"   15 (255 255 255))) ; white
 664   "Names of 16 standard xterm/aixterm colors, their numbers, and RGB values.")
 665
 666 (defun xterm-rgb-convert-to-16bit (prim)
 667   "Convert an 8-bit primary color value PRIM to a corresponding 16-bit value."
 668   (logior prim (lsh prim 8)))
 669
 670 (defun xterm-register-default-colors ()
 671   "Register the default set of colors for xterm or compatible emulator.
 672
 673 This function registers the number of colors returned by `display-color-cells'
 674 for the currently selected frame.  The first 16 colors are taken from
 675 `xterm-standard-colors', which see, while the rest are computed assuming
 676 either the 88- or 256-color standard color scheme supported by latest
 677 versions of xterm."
 678   (let* ((ncolors (display-color-cells (selected-frame)))
 679          (colors xterm-standard-colors)
 680          (color (car colors)))
 681     (if (> ncolors 0)
 682         ;; Clear the 8 default tty colors registered by startup.el
 683         (tty-color-clear))
 684     ;; Only register as many colors as are supported by the display.
 685     (while (and (> ncolors 0) colors)
 686       (tty-color-define (car color) (cadr color)
 687                         (mapcar 'xterm-rgb-convert-to-16bit
 688                                 (car (cddr color))))
 689       (setq colors (cdr colors)
 690             color (car colors)
 691             ncolors (1- ncolors)))
 692     ;; We've exhausted the colors from `xterm-standard-colors'.  If there
 693     ;; are more colors to support, compute them now.
 694     (when (> ncolors 0)
 695       (cond
 696        ((= ncolors 240) ; 256-color xterm
 697         ;; 216 non-gray colors first
 698         (let ((r 0) (g 0) (b 0))
 699           (while (> ncolors 24)
 700             ;; This and other formulas taken from 256colres.pl and
 701             ;; 88colres.pl in the xterm distribution.
 702             (tty-color-define (format "color-%d" (- 256 ncolors))
 703                               (- 256 ncolors)
 704                               (mapcar 'xterm-rgb-convert-to-16bit
 705                                       (list (if (zerop r) 0 (+ (* r 40) 55))
 706                                             (if (zerop g) 0 (+ (* g 40) 55))
 707                                             (if (zerop b) 0 (+ (* b 40) 55)))))
 708
 709             (setq b (1+ b))
 710             (if (> b 5)
 711                 (setq g (1+ g)
 712                       b 0))
 713             (if (> g 5)
 714                 (setq r (1+ r)
 715                       g 0))
 716             (setq ncolors (1- ncolors))))
 717         ;; Now the 24 gray colors
 718         (while (> ncolors 0)
 719           (setq color (xterm-rgb-convert-to-16bit (+ 8 (* (- 24 ncolors) 10))))
 720           (tty-color-define (format "color-%d" (- 256 ncolors))
 721                             (- 256 ncolors)
 722                             (list color color color))
 723           (setq ncolors (1- ncolors))))
 724        ((= ncolors 72)  ; 88-color xterm
 725         ;; 64 non-gray colors
 726         (let ((levels '(0 139 205 255))
 727               (r 0) (g 0) (b 0))
 728           (while (> ncolors 8)
 729             (tty-color-define (format "color-%d" (- 88 ncolors))
 730                               (- 88 ncolors)
 731                               (mapcar 'xterm-rgb-convert-to-16bit
 732                                       (list (nth r levels)
 733                                             (nth g levels)
 734                                             (nth b levels))))
 735             (setq b (1+ b))
 736             (if (> b 3)
 737                 (setq g (1+ g)
 738                       b 0))
 739             (if (> g 3)
 740                 (setq r (1+ r)
 741                       g 0))
 742             (setq ncolors (1- ncolors))))
 743         ;; Now the 8 gray colors
 744         (while (> ncolors 0)
 745           (setq color (xterm-rgb-convert-to-16bit
 746                        (floor
 747                         (if (= ncolors 8)
 748                             46.36363636
 749                           (+ (* (- 8 ncolors) 23.18181818) 69.54545454)))))
 750           (tty-color-define (format "color-%d" (- 88 ncolors))
 751                             (- 88 ncolors)
 752                             (list color color color))
 753           (setq ncolors (1- ncolors))))
 754        (t (error "Unsupported number of xterm colors (%d)" (+ 16 ncolors)))))
 755     ;; Modifying color mappings means realized faces don't use the
 756     ;; right colors, so clear them.
 757     (clear-face-cache)))
 758
 759 (defun xterm-maybe-set-dark-background-mode (redc greenc bluec)
 760   ;; Use the heuristic in `frame-set-background-mode' to decide if a
 761   ;; frame is dark.
 762   (when (< (+ redc greenc bluec) (* .6 (+ 65535 65535 65535)))
 763     (set-terminal-parameter nil 'background-mode 'dark)
 764     t))
 765
 766 (provide 'xterm)
 767
 768 ;;; xterm.el ends here