lisp/terminal.el

   1 ;;; terminal.el --- terminal emulator for GNU Emacs.
   2
   3 ;; Copyright (C) 1986,87,88,89,93,94 Free Software Foundation, Inc.
   4
   5 ;; Author: Richard Mlynarik <mly@eddie.mit.edu>
   6 ;; Maintainer: FSF
   7 ;; Keywords: comm, terminals
   8
   9 ;; This file is part of GNU Emacs.
  10
  11 ;; GNU Emacs is free software; you can redistribute it and/or modify
  12 ;; it under the terms of the GNU General Public License as published by
  13 ;; the Free Software Foundation; either version 2, or (at your option)
  14 ;; any later version.
  15
  16 ;; GNU Emacs is distributed in the hope that it will be useful,
  17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 ;; GNU General Public License for more details.
  20
  21 ;; You should have received a copy of the GNU General Public License
  22 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  23 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  24 ;; Boston, MA 02111-1307, USA.
  25
  26 ;;; Code:
  27
  28 ;;>>TODO
  29 ;;>> ** Nothing can be done about emacs' meta-lossage **
  30 ;;>>  (without redoing keymaps `sanely' -- ask Mly for details)
  31
  32 ;;>> One probably wants to do setenv MORE -c when running with
  33 ;;>>   more-processing enabled.
  34
  35 (require 'ehelp)
  36
  37 (defvar terminal-escape-char ?\C-^
  38   "*All characters except for this are passed verbatim through the
  39 terminal-emulator.  This character acts as a prefix for commands
  40 to the emulator program itself.  Type this character twice to send
  41 it through the emulator.  Type ? after typing it for a list of
  42 possible commands.
  43 This variable is local to each terminal-emulator buffer.")
  44
  45 (defvar terminal-scrolling t ;;>> Setting this to T sort-of defeats my whole aim in writing this package...
  46   "*If non-nil, the terminal-emulator will losingly `scroll' when output occurs
  47 past the bottom of the screen.  If nil, output will win and `wrap' to the top
  48 of the screen.
  49 This variable is local to each terminal-emulator buffer.")
  50
  51 (defvar terminal-more-processing t
  52   "*If non-nil, do more-processing.
  53 This variable is local to each terminal-emulator buffer.")
  54
  55 ;; If you are the sort of loser who uses scrolling without more breaks
  56 ;; and expects to actually see anything, you should probably set this to
  57 ;; around 400
  58 (defvar terminal-redisplay-interval 5000
  59   "*Maximum number of characters which will be processed by the
  60 terminal-emulator before a screen redisplay is forced.
  61 Set this to a large value for greater throughput,
  62 set it smaller for more frequent updates but overall slower
  63 performance.")
  64
  65 (defvar terminal-more-break-insertion
  66   "*** More break -- Press space to continue ***")
  67
  68 (defvar terminal-meta-map nil)
  69 (if terminal-meta-map
  70     nil
  71   (let ((map (make-sparse-keymap)))
  72     (define-key map [t] 'te-pass-through)
  73     (setq terminal-meta-map map)))
  74
  75 (defvar terminal-map nil)
  76 (if terminal-map
  77     nil
  78   (let ((map (make-sparse-keymap)))
  79     (define-key map [t] 'te-pass-through)
  80     (define-key map [switch-frame] 'handle-switch-frame)
  81     (define-key map "\e" terminal-meta-map)
  82     ;(define-key map "\C-l"
  83     ;  '(lambda () (interactive) (te-pass-through) (redraw-display)))
  84     (setq terminal-map map)))
  85
  86 (defvar terminal-escape-map nil)
  87 (if terminal-escape-map
  88     nil
  89   (let ((map (make-sparse-keymap)))
  90     (define-key map [t] 'undefined)
  91     (let ((s "0"))
  92       (while (<= (aref s 0) ?9)
  93         (define-key map s 'digit-argument)
  94         (aset s 0 (1+ (aref s 0)))))
  95     (define-key map "b" 'switch-to-buffer)
  96     (define-key map "o" 'other-window)
  97     (define-key map "e" 'te-set-escape-char)
  98     (define-key map "\C-l" 'redraw-display)
  99     (define-key map "\C-o" 'te-flush-pending-output)
 100     (define-key map "m" 'te-toggle-more-processing)
 101     (define-key map "x" 'te-escape-extended-command)
 102     ;;>> What use is this?  Why is it in the default terminal-emulator map?
 103     (define-key map "w" 'te-edit)
 104     (define-key map "?" 'te-escape-help)
 105     (define-key map (char-to-string help-char) 'te-escape-help)
 106     (setq terminal-escape-map map)))
 107
 108 (defvar te-escape-command-alist nil)
 109 (if te-escape-command-alist
 110     nil
 111   (setq te-escape-command-alist
 112         '(("Set Escape Character" . te-set-escape-char)
 113           ;;>> What use is this?  Why is it in the default terminal-emulator map?
 114           ("Edit" . te-edit)
 115           ("Refresh" . redraw-display)
 116           ("Record Output" . te-set-output-log)
 117           ("Photo" . te-set-output-log)
 118           ("Tofu" . te-tofu) ;; confuse the uninitiated
 119           ("Stuff Input" . te-stuff-string)
 120           ("Flush Pending Output" . te-flush-pending-output)
 121           ("Enable More Processing" . te-enable-more-processing)
 122           ("Disable More Processing" . te-disable-more-processing)
 123           ("Scroll at end of page" . te-do-scrolling)
 124           ("Wrap at end of page" . te-do-wrapping)
 125           ("Switch To Buffer" . switch-to-buffer)
 126           ("Other Window" . other-window)
 127           ("Kill Buffer" . kill-buffer)
 128           ("Help" . te-escape-help)
 129           ("Set Redisplay Interval" . te-set-redisplay-interval)
 130           )))
 131
 132 (defvar terminal-more-break-map nil)
 133 (if terminal-more-break-map
 134     nil
 135   (let ((map (make-sparse-keymap)))
 136     (define-key map [t] 'te-more-break-unread)
 137     (define-key map (char-to-string help-char) 'te-more-break-help)
 138     (define-key map " " 'te-more-break-resume)
 139     (define-key map "\C-l" 'redraw-display)
 140     (define-key map "\C-o" 'te-more-break-flush-pending-output)
 141     ;;>>> this isn't right
 142     ;(define-key map "\^?" 'te-more-break-flush-pending-output) ;DEL
 143     (define-key map "\r" 'te-more-break-advance-one-line)
 144
 145     (setq terminal-more-break-map map)))
 146
 147 \f
 148 ;;; Pacify the byte compiler
 149 (defvar te-process nil)
 150 (defvar te-log-buffer nil)
 151 (defvar te-height nil)
 152 (defvar te-width nil)
 153 (defvar te-more-count nil)
 154 (defvar te-redisplay-count nil)
 155 (defvar te-pending-output nil)
 156 (defvar te-saved-point)
 157 (defvar te-more-old-point nil)
 158 (defvar te-more-old-local-map nil)
 159 (defvar te-more-old-filter nil)
 160 (defvar te-more-old-mode-line-format nil)
 161 (defvar te-pending-output-info nil)
 162
 163 ;; Required to support terminfo systems
 164 (defconst te-terminal-name-prefix "emacs-virtual")
 165 (defvar te-terminal-name nil)
 166 \f
 167 ;;;;  escape map
 168
 169 (defun te-escape ()
 170   (interactive)
 171   (let (s
 172         (local (current-local-map))
 173         (global (current-global-map)))
 174     (unwind-protect
 175         (progn
 176           (use-global-map terminal-escape-map)
 177           (use-local-map terminal-escape-map)
 178           (setq s (read-key-sequence
 179                     (if current-prefix-arg
 180                         (format "Emacs Terminal escape> %d "
 181                                 (prefix-numeric-value current-prefix-arg))
 182                         "Emacs Terminal escape> "))))
 183       (use-global-map global)
 184       (use-local-map local))
 185
 186     (message "")
 187
 188     (cond
 189      ;;  Certain keys give vector notation, like [escape] when
 190      ;;  you hit esc key...
 191      ((and (stringp s)
 192            (string= s (make-string 1 terminal-escape-char)))
 193       (setq last-command-char terminal-escape-char)
 194       (let ((terminal-escape-char -259))
 195         (te-pass-through)))
 196
 197      ((setq s (lookup-key terminal-escape-map s))
 198       (call-interactively s)))
 199
 200     ))
 201
 202
 203 (defun te-escape-help ()
 204   "Provide help on commands available after terminal-escape-char is typed."
 205   (interactive)
 206   (message "Terminal emulator escape help...")
 207   (let ((char (single-key-description terminal-escape-char)))
 208     (with-electric-help
 209       (function (lambda ()
 210          (princ (format "Terminal-emulator escape, invoked by \"%s\"
 211 Type \"%s\" twice to send a single \"%s\" through.
 212
 213 Other chars following \"%s\" are interpreted as follows:\n"
 214                         char char char char))
 215
 216          (princ (substitute-command-keys "\\{terminal-escape-map}\n"))
 217          (princ (format "\nSubcommands of \"%s\" (%s)\n"
 218                         (where-is-internal 'te-escape-extended-command
 219                                            terminal-escape-map t)
 220                         'te-escape-extended-command))
 221          (let ((l (if (fboundp 'sortcar)
 222                       (sortcar (copy-sequence te-escape-command-alist)
 223                                'string<)
 224                       (sort (copy-sequence te-escape-command-alist)
 225                             (function (lambda (a b)
 226                               (string< (car a) (car b))))))))
 227            (while l
 228              (let ((doc (or (documentation (cdr (car l)))
 229                             "Not documented")))
 230                (if (string-match "\n" doc)
 231                    ;; just use first line of documentation
 232                    (setq doc (substring doc 0 (match-beginning 0))))
 233                (princ "  \"")
 234                (princ (car (car l)))
 235                (princ "\":\n     ")
 236                (princ doc)
 237                (write-char ?\n))
 238              (setq l (cdr l))))
 239          nil)))))
 240
 241
 242
 243 (defun te-escape-extended-command ()
 244   (interactive)
 245   (let ((c (let ((completion-ignore-case t))
 246              (completing-read "terminal command: "
 247                               te-escape-command-alist
 248                               nil t))))
 249     (if c
 250         (catch 'foo
 251           (setq c (downcase c))
 252           (let ((l te-escape-command-alist))
 253             (while l
 254               (if (string= c (downcase (car (car l))))
 255                   (throw 'foo (call-interactively (cdr (car l))))
 256                 (setq l (cdr l)))))))))
 257
 258 ;; not used.
 259 (defun te-escape-extended-command-unread ()
 260   (interactive)
 261   (setq unread-command-events (listify-key-sequence (this-command-keys)))
 262   (te-escape-extended-command))
 263
 264 (defun te-set-escape-char (c)
 265   "Change the terminal-emulator escape character."
 266   (interactive "cSet escape character to: ")
 267   (let ((o terminal-escape-char))
 268     (message (if (= o c)
 269                  "\"%s\" is the escape char"
 270                  "\"%s\" is now the escape; \"%s\" passes through")
 271              (single-key-description c)
 272              (single-key-description o))
 273     (setq terminal-escape-char c)))
 274
 275
 276 (defun te-stuff-string (string)
 277   "Read a string to send to through the terminal emulator
 278 as though that string had been typed on the keyboard.
 279
 280 Very poor man's file transfer protocol."
 281   (interactive "sStuff string: ")
 282   (process-send-string te-process string))
 283
 284 (defun te-set-output-log (name)
 285   "Record output from the terminal emulator in a buffer."
 286   (interactive (list (if te-log-buffer
 287                          nil
 288                        (read-buffer "Record output in buffer: "
 289                                     (format "%s output-log"
 290                                             (buffer-name (current-buffer)))
 291                                     nil))))
 292   (if (or (null name) (equal name ""))
 293       (progn (setq te-log-buffer nil)
 294              (message "Output logging off."))
 295     (if (get-buffer name)
 296         nil
 297       (save-excursion
 298         (set-buffer (get-buffer-create name))
 299         (fundamental-mode)
 300         (buffer-disable-undo (current-buffer))
 301         (erase-buffer)))
 302     (setq te-log-buffer (get-buffer name))
 303     (message "Recording terminal emulator output into buffer \"%s\""
 304              (buffer-name te-log-buffer))))
 305
 306 (defun te-tofu ()
 307   "Discontinue output log."
 308   (interactive)
 309   (te-set-output-log nil))
 310
 311
 312 (defun te-toggle (sym arg)
 313   (set sym (cond ((not (numberp arg)) arg)
 314                  ((= arg 1) (not (symbol-value sym)))
 315                  ((< arg 0) nil)
 316                  (t t))))
 317
 318 (defun te-toggle-more-processing (arg)
 319   (interactive "p")
 320   (message (if (te-toggle 'terminal-more-processing arg)
 321                "More processing on" "More processing off"))
 322   (if terminal-more-processing (setq te-more-count -1)))
 323
 324 (defun te-toggle-scrolling (arg)
 325   (interactive "p")
 326   (message (if (te-toggle 'terminal-scrolling arg)
 327                "Scroll at end of page" "Wrap at end of page")))
 328
 329 (defun te-enable-more-processing ()
 330   "Enable ** MORE ** processing"
 331   (interactive)
 332   (te-toggle-more-processing t))
 333
 334 (defun te-disable-more-processing ()
 335   "Disable ** MORE ** processing"
 336   (interactive)
 337   (te-toggle-more-processing nil))
 338
 339 (defun te-do-scrolling ()
 340   "Scroll at end of page (yuck)"
 341   (interactive)
 342   (te-toggle-scrolling t))
 343
 344 (defun te-do-wrapping ()
 345   "Wrap to top of window at end of page"
 346   (interactive)
 347   (te-toggle-scrolling nil))
 348
 349
 350 (defun te-set-redisplay-interval (arg)
 351   "Set the maximum interval (in output characters) between screen updates.
 352 Set this number to large value for greater throughput,
 353 set it smaller for more frequent updates (but overall slower performance."
 354   (interactive "NMax number of output chars between redisplay updates: ")
 355   (setq arg (max arg 1))
 356   (setq terminal-redisplay-interval arg
 357         te-redisplay-count 0))
 358 \f
 359 ;;;; more map
 360
 361 ;; every command -must- call te-more-break-unwind
 362 ;; or grave lossage will result
 363
 364 (put 'te-more-break-unread 'suppress-keymap t)
 365 (defun te-more-break-unread ()
 366   (interactive)
 367   (if (eq last-input-char terminal-escape-char)
 368       (call-interactively 'te-escape)
 369     (message "Continuing from more break (\"%s\" typed, %d chars output pending...)"
 370              (single-key-description last-input-char)
 371              (te-pending-output-length))
 372     (setq te-more-count 259259)
 373     (te-more-break-unwind)
 374     (let ((terminal-more-processing nil))
 375       (te-pass-through))))
 376
 377 (defun te-more-break-resume ()
 378   "Proceed past the **MORE** break,
 379 allowing the next page of output to appear"
 380   (interactive)
 381   (message "Continuing from more break")
 382   (te-more-break-unwind))
 383
 384 (defun te-more-break-help ()
 385   "Provide help on commands available in a terminal-emulator **MORE** break"
 386   (interactive)
 387   (message "Terminal-emulator more break help...")
 388   (sit-for 0)
 389   (with-electric-help
 390     (function (lambda ()
 391       (princ "Terminal-emulator more break.\n\n")
 392       (princ (format "Type \"%s\" (te-more-break-resume)\n%s\n"
 393                      (where-is-internal 'te-more-break-resume
 394                                         terminal-more-break-map t)
 395                      (documentation 'te-more-break-resume)))
 396       (princ (substitute-command-keys "\\{terminal-more-break-map}\n"))
 397       (princ "Any other key is passed through to the program
 398 running under the terminal emulator and disables more processing until
 399 all pending output has been dealt with.")
 400       nil))))
 401
 402
 403 (defun te-more-break-advance-one-line ()
 404   "Allow one more line of text to be output before doing another more break."
 405   (interactive)
 406   (setq te-more-count 1)
 407   (te-more-break-unwind))
 408
 409 (defun te-more-break-flush-pending-output ()
 410   "Discard any output which has been received by the terminal emulator but
 411 not yet processed and then proceed from the more break."
 412   (interactive)
 413   (te-more-break-unwind)
 414   (te-flush-pending-output))
 415
 416 (defun te-flush-pending-output ()
 417   "Discard any as-yet-unprocessed output which has been received by
 418 the terminal emulator."
 419   (interactive)
 420   ;; this could conceivably be confusing in the presence of
 421   ;; escape-sequences spanning process-output chunks
 422   (if (null (cdr te-pending-output))
 423       (message "(There is no output pending)")
 424     (let ((length (te-pending-output-length)))
 425       (message "Flushing %d chars of pending output" length)
 426       (setq te-pending-output
 427             (list 0 (format "\n*** %d chars of pending output flushed ***\n"
 428                             length)))
 429       (te-update-pending-output-display)
 430       (te-process-output nil)
 431       (sit-for 0))))
 432
 433 \f
 434 (defun te-pass-through ()
 435   "Character is passed to the program running under the terminal emulator.
 436 One characters is treated specially:
 437 the terminal escape character (normally C-^)
 438 lets you type a terminal emulator command."
 439   (interactive)
 440   (cond ((eq last-input-char terminal-escape-char)
 441          (call-interactively 'te-escape))
 442         (t
 443          ;; Convert `return' to C-m, etc.
 444          (if (and (symbolp last-input-char)
 445                   (get last-input-char 'ascii-character))
 446              (setq last-input-char (get last-input-char 'ascii-character)))
 447          ;; Convert meta characters to 8-bit form for transmission.
 448          (if (and (integerp last-input-char)
 449                   (not (zerop (logand last-input-char ?\M-\^@))))
 450              (setq last-input-char (+ 128 (logand last-input-char 127))))
 451          ;; Now ignore all but actual characters.
 452          ;; (It ought to be possible to send through function
 453          ;; keys as character sequences if we add a description
 454          ;; to our termcap entry of what they should look like.)
 455          (if (integerp last-input-char)
 456              (progn
 457                (and terminal-more-processing (null (cdr te-pending-output))
 458                     (te-set-more-count nil))
 459                (send-string te-process (make-string 1 last-input-char))
 460                (te-process-output t))
 461            (message "Function key `%s' ignored"
 462                     (single-key-description last-input-char))))))
 463
 464
 465 (defun te-set-window-start ()
 466   (let* ((w (get-buffer-window (current-buffer)))
 467          (h (if w (window-height w))))
 468     (cond ((not w)) ; buffer not displayed
 469           ((>= h (/ (- (point) (point-min)) (1+ te-width)))
 470            ;; this is the normal case
 471            (set-window-start w (point-min)))
 472           ;; this happens if some vandal shrinks our window.
 473           ((>= h (/ (- (point-max) (point)) (1+ te-width)))
 474            (set-window-start w (- (point-max) (* h (1+ te-width)) -1)))
 475           ;; I give up.
 476           (t nil))))
 477
 478 (defun te-pending-output-length ()
 479   (let ((length (car te-pending-output))
 480         (tem (cdr te-pending-output)))
 481     (while tem
 482       (setq length (+ length (length (car tem))) tem (cdr tem)))
 483     length))
 484 \f
 485 ;;>> What use is this terminal-edit stuff anyway?
 486 ;;>>  If nothing else, it was written by somebody who didn't
 487 ;;>>  competently understand the terminal-emulator...
 488
 489 (defvar terminal-edit-map nil)
 490 (if terminal-edit-map
 491     nil
 492   (setq terminal-edit-map (make-sparse-keymap))
 493   (define-key terminal-edit-map "\C-c\C-c" 'terminal-cease-edit))
 494
 495 ;; Terminal Edit mode is suitable only for specially formatted data.
 496 (put 'terminal-edit-mode 'mode-class 'special)
 497
 498 (defun terminal-edit-mode ()
 499   "Major mode for editing the contents of a terminal-emulator buffer.
 500 The editing commands are the same as in Fundamental mode,
 501 together with a command \\<terminal-edit-map>to return to terminal emulation: \\[terminal-cease-edit]."
 502   (use-local-map terminal-edit-map)
 503   (setq major-mode 'terminal-edit-mode)
 504   (setq mode-name "Terminal Edit")
 505   (setq mode-line-modified (default-value 'mode-line-modified))
 506   (setq mode-line-process nil)
 507   (run-hooks 'terminal-edit-mode-hook))
 508
 509 (defun te-edit ()
 510   "Start editing the terminal emulator buffer with ordinary Emacs commands."
 511   (interactive)
 512   (terminal-edit-mode)
 513   (force-mode-line-update)
 514   ;; Make mode line update.
 515   (if (eq (key-binding "\C-c\C-c") 'terminal-cease-edit)
 516       (message "Editing: Type C-c C-c to return to Terminal")
 517     (message (substitute-command-keys
 518                "Editing: Type \\[terminal-cease-edit] to return to Terminal"))))
 519
 520 (defun terminal-cease-edit ()
 521   "Finish editing message; switch back to Terminal proper."
 522   (interactive)
 523
 524   ;;>> emulator will blow out if buffer isn't exactly te-width x te-height
 525   (let ((buffer-read-only nil))
 526     (widen)
 527     (let ((opoint (point-marker))
 528           (width te-width)
 529           (h (1- te-height)))
 530       (goto-char (point-min))
 531       (while (>= h 0)
 532         (let ((p (point)))
 533           (cond ((search-forward "\n" (+ p width) 'move)
 534                  (forward-char -1)
 535                  (insert-char ?\  (- width (- (point) p)))
 536                  (forward-char 1))
 537                 ((eobp)
 538                  (insert-char ?\  (- width (- (point) p))))
 539                 ((= (following-char) ?\n)
 540                  (forward-char 1))
 541                 (t
 542                  (setq p (point))
 543                  (if (search-forward "\n" nil t)
 544                      (delete-region p (1- (point)))
 545                      (delete-region p (point-max))))))
 546         (if (= h 0)
 547             (if (not (eobp)) (delete-region (point) (point-max)))
 548             (if (eobp) (insert ?\n)))
 549         (setq h (1- h)))
 550       (goto-char opoint)
 551       (set-marker opoint nil nil)
 552       (setq te-saved-point (point))
 553       (setq te-redisplay-count 0)
 554       (setq te-more-count -1)))
 555
 556   (setq mode-line-modified (default-value 'mode-line-modified))
 557   (use-local-map terminal-map)
 558   (setq major-mode 'terminal-mode)
 559   (setq mode-name "terminal")
 560   (setq mode-line-process '(":%s")))
 561 \f
 562 ;;;; more break hair
 563
 564 (defun te-more-break ()
 565   (te-set-more-count t)
 566   (make-local-variable 'te-more-old-point)
 567   (setq te-more-old-point (point))
 568   (make-local-variable 'te-more-old-local-map)
 569   (setq te-more-old-local-map (current-local-map))
 570   (use-local-map terminal-more-break-map)
 571   (make-local-variable 'te-more-old-filter)
 572   (setq te-more-old-filter (process-filter te-process))
 573   (make-local-variable 'te-more-old-mode-line-format)
 574   (setq te-more-old-mode-line-format mode-line-format
 575         mode-line-format (list "--   **MORE**  "
 576                                mode-line-buffer-identification
 577                                "%-"))
 578   (set-process-filter te-process
 579     (function (lambda (process string)
 580                 (save-excursion
 581                   (set-buffer (process-buffer process))
 582                   (setq te-pending-output (nconc te-pending-output
 583                                                  (list string))))
 584                   (te-update-pending-output-display))))
 585   (te-update-pending-output-display)
 586   (if (eq (window-buffer (selected-window)) (current-buffer))
 587       (message "More break "))
 588   (or (eobp)
 589       (null terminal-more-break-insertion)
 590       (save-excursion
 591         (forward-char 1)
 592         (delete-region (point) (+ (point) te-width))
 593         (insert terminal-more-break-insertion)))
 594   (run-hooks 'terminal-more-break-hook)
 595   (sit-for 0) ;get display to update
 596   (throw 'te-process-output t))
 597
 598 (defun te-more-break-unwind ()
 599   (use-local-map te-more-old-local-map)
 600   (set-process-filter te-process te-more-old-filter)
 601   (goto-char te-more-old-point)
 602   (setq mode-line-format te-more-old-mode-line-format)
 603   (force-mode-line-update)
 604   (let ((buffer-read-only nil))
 605     (cond ((eobp))
 606           (terminal-more-break-insertion
 607            (forward-char 1)
 608            (delete-region (point)
 609                           (+ (point) (length terminal-more-break-insertion)))
 610            (insert-char ?\  te-width)
 611            (goto-char te-more-old-point)))
 612     (setq te-more-old-point nil)
 613     (let ((te-more-count 259259))
 614       (te-newline)))
 615   ;(sit-for 0)
 616   (te-process-output t))
 617
 618 (defun te-set-more-count (newline)
 619   (let ((line (/ (- (point) (point-min)) (1+ te-width))))
 620     (if newline (setq line (1+ line)))
 621     (cond ((= line te-height)
 622            (setq te-more-count te-height))
 623           ;>>>> something is strange.  Investigate this!
 624           ((= line (1- te-height))
 625            (setq te-more-count te-height))
 626           ((or (< line (/ te-height 2))
 627                (> (- te-height line) 10))
 628            ;; break at end of this page
 629            (setq te-more-count (- te-height line)))
 630           (t
 631            ;; migrate back towards top (ie bottom) of screen.
 632            (setq te-more-count (- te-height
 633                                   (if (> te-height 10) 2 1)))))))
 634
 635 \f
 636 ;;;; More or less straight-forward terminal escapes
 637
 638 ;; ^j, meaning `newline' to non-display programs.
 639 ;; (Who would think of ever writing a system which doesn't understand
 640 ;;  display terminals natively?  Un*x:  The Operating System of the Future.)
 641 (defun te-newline ()
 642   "Move down a line, optionally do more processing, perhaps wrap/scroll,
 643 move to start of new line, clear to end of line."
 644   (end-of-line)
 645   (cond ((not terminal-more-processing))
 646         ((< (setq te-more-count (1- te-more-count)) 0)
 647          (te-set-more-count t))
 648         ((eql te-more-count 0)
 649          ;; this doesn't return
 650          (te-more-break)))
 651   (if (eobp)
 652       (progn
 653         (delete-region (point-min) (+ (point-min) te-width))
 654         (goto-char (point-min))
 655         (if terminal-scrolling
 656             (progn (delete-char 1)
 657                    (goto-char (point-max))
 658                    (insert ?\n))))
 659     (forward-char 1)
 660     (delete-region (point) (+ (point) te-width)))
 661   (insert-char ?\  te-width)
 662   (beginning-of-line)
 663   (te-set-window-start))
 664
 665 ; ^p = x+32 y+32
 666 (defun te-move-to-position ()
 667   ;; must offset by #o40 since cretinous unix won't send a 004 char through
 668   (let ((y (- (te-get-char) 32))
 669         (x (- (te-get-char) 32)))
 670     (if (or (> x te-width)
 671             (> y te-height))
 672         ()
 673       (goto-char (+ (point-min) x (* y (1+ te-width))))
 674       ;(te-set-window-start?)
 675       ))
 676   (setq te-more-count -1))
 677
 678
 679
 680 ;; ^p c
 681 (defun te-clear-rest-of-line ()
 682   (save-excursion
 683     (let ((n (- (point) (progn (end-of-line) (point)))))
 684       (delete-region (point) (+ (point) n))
 685       (insert-char ?\  (- n)))))
 686
 687
 688 ;; ^p C
 689 (defun te-clear-rest-of-screen ()
 690   (save-excursion
 691     (te-clear-rest-of-line)
 692     (while (progn (end-of-line) (not (eobp)))
 693       (forward-char 1) (end-of-line)
 694       (delete-region (- (point) te-width) (point))
 695       (insert-char ?\  te-width))))
 696
 697
 698 ;; ^p ^l
 699 (defun te-clear-screen ()
 700   ;; regenerate buffer to compensate for (nonexistent!!) bugs.
 701   (erase-buffer)
 702   (let ((i 0))
 703     (while (< i te-height)
 704       (setq i (1+ i))
 705       (insert-char ?\  te-width)
 706       (insert ?\n)))
 707   (delete-region (1- (point-max)) (point-max))
 708   (goto-char (point-min))
 709   (setq te-more-count -1))
 710
 711
 712 ;; ^p ^o count+32
 713 (defun te-insert-lines ()
 714   (if (not (bolp))
 715       ();(error "fooI")
 716     (save-excursion
 717       (let* ((line (- te-height (/ (- (point) (point-min)) (1+ te-width)) -1))
 718              (n (min (- (te-get-char) ?\ ) line))
 719              (i 0))
 720         (delete-region (- (point-max) (* n (1+ te-width))) (point-max))
 721         (if (eql (point) (point-max)) (insert ?\n))
 722         (while (< i n)
 723           (setq i (1+ i))
 724           (insert-char ?\  te-width)
 725           (or (eql i line) (insert ?\n))))))
 726   (setq te-more-count -1))
 727
 728
 729 ;; ^p ^k count+32
 730 (defun te-delete-lines ()
 731   (if (not (bolp))
 732       ();(error "fooD")
 733     (let* ((line (- te-height (/ (- (point) (point-min)) (1+ te-width)) -1))
 734            (n (min (- (te-get-char) ?\ ) line))
 735            (i 0))
 736       (delete-region (point)
 737                      (min (+ (point) (* n (1+ te-width))) (point-max)))
 738       (save-excursion
 739         (goto-char (point-max))
 740         (while (< i n)
 741           (setq i (1+ i))
 742           (insert-char ?\  te-width)
 743           (or (eql i line) (insert ?\n))))))
 744   (setq te-more-count -1))
 745
 746 ;; ^p ^a
 747 (defun te-beginning-of-line ()
 748   (beginning-of-line))
 749
 750 ;; ^p ^b
 751 (defun te-backward-char ()
 752   (if (not (bolp))
 753       (backward-char 1)))
 754
 755 ;; ^p ^f
 756 (defun te-forward-char ()
 757   (if (not (eolp))
 758       (forward-char 1)))
 759
 760 \f
 761 ;; 0177
 762 (defun te-delete ()
 763   (if (bolp)
 764       ()
 765     (delete-region (1- (point)) (point))
 766     (insert ?\ )
 767     (forward-char -1)))
 768
 769 ;; ^p ^g
 770 (defun te-beep ()
 771   (beep))
 772
 773
 774 ;; ^p _ count+32
 775 (defun te-insert-spaces ()
 776   (let* ((p (point))
 777          (n (min (- (te-get-char) 32)
 778                  (- (progn (end-of-line) (point)) p))))
 779     (if (<= n 0)
 780         nil
 781       (delete-char (- n))
 782       (goto-char p)
 783       (insert-char ?\  n))
 784     (goto-char p)))
 785
 786 ;; ^p d count+32  (should be ^p ^d but cretinous un*x won't send ^d chars!!!)
 787 (defun te-delete-char ()
 788   (let* ((p (point))
 789          (n (min (- (te-get-char) 32)
 790                  (- (progn (end-of-line) (point)) p))))
 791     (if (<= n 0)
 792         nil
 793       (insert-char ?\  n)
 794       (goto-char p)
 795       (delete-char n))
 796     (goto-char p)))
 797
 798
 799 \f
 800 ;; disgusting unix-required shit
 801 ;;  Are we living twenty years in the past yet?
 802
 803 (defun te-losing-unix ()
 804   nil)
 805
 806 ;; ^i
 807 (defun te-output-tab ()
 808   (let* ((p (point))
 809          (x (- p (progn (beginning-of-line) (point))))
 810          (l (min (- 8 (logand x 7))
 811                  (progn (end-of-line) (- (point) p)))))
 812     (goto-char (+ p l))))
 813
 814 ;; ^p ^j
 815 ;; Handle the `do' or `nl' termcap capability.
 816 ;;>> I am not sure why this broken, obsolete, capability is here.
 817 ;;>> Perhaps it is for VIle.  No comment was made about why it
 818 ;;>> was added (in "Sun Dec  6 01:22:27 1987  Richard Stallman")
 819 (defun te-down-vertically-or-scroll ()
 820   "Move down a line vertically, or scroll at bottom."
 821   (let ((column (current-column)))
 822     (end-of-line)
 823     (if (eobp)
 824         (progn
 825           (delete-region (point-min) (+ (point-min) te-width))
 826           (goto-char (point-min))
 827           (delete-char 1)
 828           (goto-char (point-max))
 829           (insert ?\n)
 830           (insert-char ?\  te-width)
 831           (beginning-of-line))
 832       (forward-line 1))
 833     (move-to-column column))
 834   (te-set-window-start))
 835
 836 ;; Also:
 837 ;;  ^m => beginning-of-line (for which it -should- be using ^p ^a, right?!!)
 838 ;;  ^g => te-beep (for which it should use ^p ^g)
 839 ;;  ^h => te-backward-char (for which it should use ^p ^b)
 840
 841 \f
 842
 843 (defun te-filter (process string)
 844   (let* ((obuf (current-buffer)))
 845     ;; can't use save-excursion, as that preserves point, which we don't want
 846     (unwind-protect
 847         (progn
 848           (set-buffer (process-buffer process))
 849           (goto-char te-saved-point)
 850           (and (bufferp te-log-buffer)
 851                (if (null (buffer-name te-log-buffer))
 852                    ;; killed
 853                    (setq te-log-buffer nil)
 854                  (set-buffer te-log-buffer)
 855                  (goto-char (point-max))
 856                  (insert-before-markers string)
 857                  (set-buffer (process-buffer process))))
 858           (setq te-pending-output (nconc te-pending-output (list string)))
 859           (te-update-pending-output-display)
 860           (te-process-output (eq (current-buffer)
 861                                  (window-buffer (selected-window))))
 862           (set-buffer (process-buffer process))
 863           (setq te-saved-point (point)))
 864       (set-buffer obuf))))
 865
 866 ;; (A version of the following comment which might be distractingly offensive
 867 ;; to some readers has been moved to term-nasty.el.)
 868 ;; unix lacks ITS-style tty control...
 869 (defun te-process-output (preemptible)
 870   ;;>> There seems no good reason to ever disallow preemption
 871   (setq preemptible t)
 872   (catch 'te-process-output
 873     (let ((buffer-read-only nil)
 874           (string nil) ostring start char (matchpos nil))
 875       (while (cdr te-pending-output)
 876         (setq ostring string
 877               start (car te-pending-output)
 878               string (car (cdr te-pending-output))
 879               char (aref string start))
 880         (if (eql (setq start (1+ start)) (length string))
 881             (progn (setq te-pending-output
 882                            (cons 0 (cdr (cdr te-pending-output)))
 883                          start 0
 884                          string (car (cdr te-pending-output)))
 885                    (te-update-pending-output-display))
 886             (setcar te-pending-output start))
 887         (if (and (> char ?\037) (< char ?\377))
 888             (cond ((eolp)
 889                    ;; unread char
 890                    (if (eql start 0)
 891                        (setq te-pending-output
 892                              (cons 0 (cons (make-string 1 char)
 893                                            (cdr te-pending-output))))
 894                        (setcar te-pending-output (1- start)))
 895                    (te-newline))
 896                   ((null string)
 897                    (delete-char 1) (insert char)
 898                    (te-redisplay-if-necessary 1))
 899                   (t
 900                    (let ((end (or (and (eq ostring string) matchpos)
 901                                   (setq matchpos (string-match
 902                                                    "[\000-\037\177-\377]"
 903                                                    string start))
 904                                   (length string))))
 905                      (delete-char 1) (insert char)
 906                      (setq char (point)) (end-of-line)
 907                      (setq end (min end (+ start (- (point) char))))
 908                      (goto-char char)
 909                      (if (eql end matchpos) (setq matchpos nil))
 910                      (delete-region (point) (+ (point) (- end start)))
 911                      (insert (if (and (eql start 0)
 912                                       (eql end (length string)))
 913                                  string
 914                                  (substring string start end)))
 915                      (if (eql end (length string))
 916                          (setq te-pending-output
 917                                (cons 0 (cdr (cdr te-pending-output))))
 918                          (setcar te-pending-output end))
 919                      (te-redisplay-if-necessary (1+ (- end start))))))
 920           ;; I suppose if I split the guts of this out into a separate
 921           ;;  function we could trivially emulate different terminals
 922           ;; Who cares in any case?  (Apart from stupid losers using rlogin)
 923           (funcall
 924             (if (eql char ?\^p)
 925                 (or (cdr (assq (te-get-char)
 926                                '((?= . te-move-to-position)
 927                                  (?c . te-clear-rest-of-line)
 928                                  (?C . te-clear-rest-of-screen)
 929                                  (?\C-o . te-insert-lines)
 930                                  (?\C-k . te-delete-lines)
 931                                  ;; not necessary, but help sometimes.
 932                                  (?\C-a . te-beginning-of-line)
 933                                  (?\C-b . te-backward-char)
 934                                  ;; should be C-d, but un*x
 935                                  ;;  pty's won't send \004 through!
 936                                  ;; Can you believe this?
 937                                  (?d . te-delete-char)
 938                                  (?_ . te-insert-spaces)
 939                                  ;; random
 940                                  (?\C-f . te-forward-char)
 941                                  (?\C-g . te-beep)
 942                                  (?\C-j . te-down-vertically-or-scroll)
 943                                  (?\C-l . te-clear-screen)
 944                                  )))
 945                     'te-losing-unix)
 946                 (or (cdr (assq char
 947                                '((?\C-j . te-newline)
 948                                  (?\177 . te-delete)
 949                                  ;; Did I ask to be sent these characters?
 950                                  ;; I don't remember doing so, either.
 951                                  ;; (Perhaps some operating system or
 952                                  ;; other is completely incompetent...)
 953                                  (?\C-m . te-beginning-of-line)
 954                                  (?\C-g . te-beep)
 955                                  (?\C-h . te-backward-char)
 956                                  (?\C-i . te-output-tab))))
 957                     'te-losing-unix)))
 958           (te-redisplay-if-necessary 1))
 959         (and preemptible
 960              (input-pending-p)
 961              ;; preemptible output!  Oh my!!
 962              (throw 'te-process-output t)))))
 963   ;; We must update window-point in every window displaying our buffer
 964   (let* ((s (selected-window))
 965          (w s))
 966     (while (not (eq s (setq w (next-window w))))
 967       (if (eq (window-buffer w) (current-buffer))
 968           (set-window-point w (point))))))
 969
 970 (defun te-get-char ()
 971   (if (cdr te-pending-output)
 972       (let ((start (car te-pending-output))
 973             (string (car (cdr te-pending-output))))
 974         (prog1 (aref string start)
 975           (if (eql (setq start (1+ start)) (length string))
 976               (setq te-pending-output (cons 0 (cdr (cdr te-pending-output))))
 977               (setcar te-pending-output start))))
 978     (catch 'char
 979       (let ((filter (process-filter te-process)))
 980         (unwind-protect
 981             (progn
 982               (set-process-filter te-process
 983                                   (function (lambda (p s)
 984                                     (or (eql (length s) 1)
 985                                         (setq te-pending-output (list 1 s)))
 986                                     (throw 'char (aref s 0)))))
 987               (accept-process-output te-process))
 988           (set-process-filter te-process filter))))))
 989
 990
 991 (defun te-redisplay-if-necessary (length)
 992   (and (<= (setq te-redisplay-count (- te-redisplay-count length)) 0)
 993        (eq (current-buffer) (window-buffer (selected-window)))
 994        (waiting-for-user-input-p)
 995        (progn (te-update-pending-output-display)
 996               (sit-for 0)
 997               (setq te-redisplay-count terminal-redisplay-interval))))
 998
 999 (defun te-update-pending-output-display ()
1000   (if (null (cdr te-pending-output))
1001       (setq te-pending-output-info "")
1002     (let ((length (te-pending-output-length)))
1003       (if (< length 1500)
1004           (setq te-pending-output-info "")
1005         (setq te-pending-output-info (format "(%dK chars output pending) "
1006                                              (/ (+ length 512) 1024))))))
1007   (force-mode-line-update))
1008
1009 \f
1010 (defun te-sentinel (process message)
1011   (cond ((eq (process-status process) 'run))
1012         ((null (buffer-name (process-buffer process)))) ;deleted
1013         (t (let ((b (current-buffer)))
1014              (save-excursion
1015                (set-buffer (process-buffer process))
1016                (setq buffer-read-only nil)
1017                (fundamental-mode)
1018                (goto-char (point-max))
1019                (delete-blank-lines)
1020                (delete-horizontal-space)
1021                (insert "\n*******\n" message "*******\n"))
1022              (if (and (eq b (process-buffer process))
1023                       (waiting-for-user-input-p))
1024                  (progn (goto-char (point-max))
1025                         (recenter -1)))))))
1026 \f
1027 (defvar te-stty-string "stty -nl erase '^?' kill '^u' intr '^c' echo pass8"
1028   "Shell command to set terminal modes for terminal emulator.")
1029 ;; This used to have `new' in it, but that loses outside BSD
1030 ;; and it's apparently not needed in BSD.
1031
1032 (defvar explicit-shell-file-name nil
1033   "*If non-nil, is file name to use for explicitly requested inferior shell.")
1034
1035 ;;;###autoload
1036 (defun terminal-emulator (buffer program args &optional width height)
1037   "Under a display-terminal emulator in BUFFER, run PROGRAM on arguments ARGS.
1038 ARGS is a list of argument-strings.  Remaining arguments are WIDTH and HEIGHT.
1039 BUFFER's contents are made an image of the display generated by that program,
1040 and any input typed when BUFFER is the current Emacs buffer is sent to that
1041 program an keyboard input.
1042
1043 Interactively, BUFFER defaults to \"*terminal*\" and PROGRAM and ARGS
1044 are parsed from an input-string using your usual shell.
1045 WIDTH and HEIGHT are determined from the size of the current window
1046 -- WIDTH will be one less than the window's width, HEIGHT will be its height.
1047
1048 To switch buffers and leave the emulator, or to give commands
1049 to the emulator itself (as opposed to the program running under it),
1050 type Control-^.  The following character is an emulator command.
1051 Type Control-^ twice to send it to the subprogram.
1052 This escape character may be changed using the variable `terminal-escape-char'.
1053
1054 `Meta' characters may not currently be sent through the terminal emulator.
1055
1056 Here is a list of some of the variables which control the behaviour
1057 of the emulator -- see their documentation for more information:
1058 terminal-escape-char, terminal-scrolling, terminal-more-processing,
1059 terminal-redisplay-interval.
1060
1061 This function calls the value of terminal-mode-hook if that exists
1062 and is non-nil after the terminal buffer has been set up and the
1063 subprocess started."
1064   (interactive
1065     (cons (save-excursion
1066             (set-buffer (get-buffer-create "*terminal*"))
1067             (buffer-name (if (or (not (boundp 'te-process))
1068                                  (null te-process)
1069                                  (not (eq (process-status te-process)
1070                                           'run)))
1071                              (current-buffer)
1072                            (generate-new-buffer "*terminal*"))))
1073           (append
1074             (let* ((default-s
1075                      ;; Default shell is same thing M-x shell uses.
1076                      (or explicit-shell-file-name
1077                          (getenv "ESHELL")
1078                          (getenv "SHELL")
1079                          "/bin/sh"))
1080                    (s (read-string
1081                        (format "Run program in emulator: (default %s) "
1082                                default-s))))
1083               (if (equal s "")
1084                   (list default-s '())
1085                 (te-parse-program-and-args s))))))
1086   (switch-to-buffer buffer)
1087   (if (null width) (setq width (- (window-width (selected-window)) 1)))
1088   (if (null height) (setq height (- (window-height (selected-window)) 1)))
1089   (terminal-mode)
1090   (setq te-width width te-height height)
1091   (setq te-terminal-name (concat te-terminal-name-prefix "-" te-width
1092                                  te-height))
1093   (setq mode-line-buffer-identification
1094         (list (format "Emacs terminal %dx%d: %%b  " te-width te-height)
1095               'te-pending-output-info))
1096   (let ((buffer-read-only nil))
1097     (te-clear-screen))
1098   (let (process)
1099     (while (setq process (get-buffer-process (current-buffer)))
1100       (if (y-or-n-p (format "Kill process %s? " (process-name process)))
1101           (delete-process process)
1102         (error "Process %s not killed" (process-name process)))))
1103   (condition-case err
1104       (let ((process-environment
1105              (cons (concat "TERM=" te-terminal-name)
1106                    (cons (concat "TERMCAP=" (te-create-termcap))
1107                          (cons (concat "TERMINFO=" (te-create-terminfo))
1108                                process-environment)))))
1109         (setq te-process
1110               (start-process "terminal-emulator" (current-buffer)
1111                              "/bin/sh" "-c"
1112                              ;; Yuck!!! Start a shell to set some terminal
1113                              ;; control characteristics.  Then start the
1114                              ;; "env" program to setup the terminal type
1115                              ;; Then finally start the program we wanted.
1116                              (format "%s; exec %s"
1117                                      te-stty-string
1118                                      (mapconcat 'te-quote-arg-for-sh
1119                                                 (cons program args) " "))))
1120         (set-process-filter te-process 'te-filter)
1121         (set-process-sentinel te-process 'te-sentinel))
1122     (error (fundamental-mode)
1123            (signal (car err) (cdr err))))
1124   (setq inhibit-quit t)                 ;sport death
1125   (use-local-map terminal-map)
1126   (run-hooks 'terminal-mode-hook)
1127   (message "Entering emacs terminal-emulator...  Type %s %s for help"
1128            (single-key-description terminal-escape-char)
1129            (mapconcat 'single-key-description
1130                       (where-is-internal 'te-escape-help terminal-escape-map t)
1131                       " ")))
1132
1133
1134 (defun te-parse-program-and-args (s)
1135   (cond ((string-match "\\`\\([-a-zA-Z0-9+=_.@/:]+[ \t]*\\)+\\'" s)
1136          (let ((l ()) (p 0))
1137            (while p
1138              (setq l (cons (if (string-match
1139                                 "\\([-a-zA-Z0-9+=_.@/:]+\\)\\([ \t]+\\)*"
1140                                 s p)
1141                                (prog1 (substring s p (match-end 1))
1142                                  (setq p (match-end 0))
1143                                  (if (eql p (length s)) (setq p nil)))
1144                                (prog1 (substring s p)
1145                                  (setq p nil)))
1146                            l)))
1147            (setq l (nreverse l))
1148            (list (car l) (cdr l))))
1149         ((and (string-match "[ \t]" s) (not (file-exists-p s)))
1150          (list shell-file-name (list "-c" (concat "exec " s))))
1151         (t (list s ()))))
1152
1153 (put 'terminal-mode 'mode-class 'special)
1154 ;; This is only separated out from function terminal-emulator
1155 ;; to keep the latter a little more manageable.
1156 (defun terminal-mode ()
1157   "Set up variables for use with the terminal-emulator.
1158 One should not call this -- it is an internal function
1159 of the terminal-emulator"
1160   (kill-all-local-variables)
1161   (buffer-disable-undo (current-buffer))
1162   (setq major-mode 'terminal-mode)
1163   (setq mode-name "terminal")
1164 ; (make-local-variable 'Helper-return-blurb)
1165 ; (setq Helper-return-blurb "return to terminal simulator")
1166   (setq mode-line-process '(":%s"))
1167   (setq buffer-read-only t)
1168   (setq truncate-lines t)
1169   (make-local-variable 'terminal-escape-char)
1170   (setq terminal-escape-char (default-value 'terminal-escape-char))
1171   (make-local-variable 'terminal-scrolling)
1172   (setq terminal-scrolling (default-value 'terminal-scrolling))
1173   (make-local-variable 'terminal-more-processing)
1174   (setq terminal-more-processing (default-value 'terminal-more-processing))
1175   (make-local-variable 'terminal-redisplay-interval)
1176   (setq terminal-redisplay-interval (default-value 'terminal-redisplay-interval))
1177   (make-local-variable 'te-width)
1178   (make-local-variable 'te-height)
1179   (make-local-variable 'te-process)
1180   (make-local-variable 'te-pending-output)
1181   (setq te-pending-output (list 0))
1182   (make-local-variable 'te-saved-point)
1183   (setq te-saved-point (point-min))
1184   (make-local-variable 'te-pending-output-info) ;for the mode line
1185   (setq te-pending-output-info "")
1186   (make-local-variable 'inhibit-quit)
1187   ;(setq inhibit-quit t)
1188   (make-local-variable 'te-log-buffer)
1189   (setq te-log-buffer nil)
1190   (make-local-variable 'te-more-count)
1191   (setq te-more-count -1)
1192   (make-local-variable 'te-redisplay-count)
1193   (setq te-redisplay-count terminal-redisplay-interval)
1194   ;(use-local-map terminal-mode-map)
1195   ;; terminal-mode-hook is called above in function terminal-emulator
1196   )
1197 \f
1198 ;;;; what a complete loss
1199
1200 (defun te-quote-arg-for-sh (string)
1201   (cond ((string-match "\\`[-a-zA-Z0-9+=_.@/:]+\\'"
1202                        string)
1203          string)
1204         ((not (string-match "[$]" string))
1205          ;; "[\"\\]" are special to sh and the lisp reader in the same way
1206          (prin1-to-string string))
1207         (t
1208          (let ((harder "")
1209                (start 0)
1210                (end 0))
1211            (while (cond ((>= start (length string))
1212                          nil)
1213                         ;; this is the set of chars magic with "..." in `sh'
1214                         ((setq end (string-match "[\"\\$]"
1215                                                  string start))
1216                          t)
1217                         (t (setq harder (concat harder
1218                                                 (substring string start)))
1219                            nil))
1220              (setq harder (concat harder (substring string start end)
1221                                   ;; Can't use ?\\ since `concat'
1222                                   ;; unfortunately does prin1-to-string
1223                                   ;; on fixna.  Amazing.
1224                                   "\\"
1225                                   (substring string
1226                                              end
1227                                              (1+ end)))
1228                    start (1+ end)))
1229            (concat "\"" harder "\"")))))
1230
1231 (defun te-create-terminfo ()
1232   "Create and compile a terminfo entry for the virtual terminal. This is kept
1233 in the /tmp directory"
1234   (if (and system-uses-terminfo
1235            (not (file-exists-p (concat  "/tmp/"
1236                                         (substring te-terminal-name-prefix 0 1)
1237                                         "/" te-terminal-name))))
1238     (let ( (terminfo
1239             (concat
1240              (format "%s,mir, xon,cols#%d, lines#%d,"
1241                      te-terminal-name te-width te-height)
1242              "bel=^P^G, clear=^P\\f, cr=^P^A, cub1=^P^B, cud1=^P\\n,"
1243              "cuf1=^P^F, cup=^P=%p1%'\\s'%+%c%p2%'\\s'%+%c,"
1244              "dch=^Pd%p1%'\\s'%+%c, dch1=^Pd!, dl=^P^K%p1%'\\s'%+%c,"
1245              "dl1=^P^K!, ed=^PC, el=^Pc, home=^P=\\s\\s,"
1246              "ich=^P_%p1%'\\s'%+%c, ich1=^P_!, il=^P^O%p1%'\\s'%+%c,"
1247              "il1=^P^O!, ind=^P\\n, nel=\\n,"))
1248            (file-name (concat "/tmp/" te-terminal-name ".tif")) )
1249       (save-excursion
1250         (set-buffer (create-file-buffer file-name))
1251         (insert terminfo)
1252         (write-file file-name)
1253         (kill-buffer nil)
1254         )
1255       (let ( (process-environment
1256               (cons (concat "TERMINFO=" "/tmp")
1257                     process-environment)) )
1258         (set-process-sentinel (start-process "tic" nil "tic" file-name)
1259                               'te-tic-sentinel))))
1260     "/tmp"
1261 )
1262
1263 (defun te-create-termcap ()
1264   "Create a termcap entry for the virtual terminal"
1265   ;; Because of Unix Brain Death(tm), we can't change
1266   ;;  the terminal type of a running process, and so
1267   ;;  terminal size and scrollability are wired-down
1268   ;;  at this point.  ("Detach?  What's that?")
1269   (concat (format "%s:co#%d:li#%d:%s"
1270                   ;; Sigh.  These can't be dynamically changed.
1271                   te-terminal-name te-width te-height (if terminal-scrolling
1272                                          "" "ns:"))
1273           ;;-- Basic things
1274           ;; cursor-motion, bol, forward/backward char
1275           "cm=^p=%+ %+ :cr=^p^a:le=^p^b:nd=^p^f:"
1276           ;; newline, clear eof/eof, audible bell
1277           "nw=^j:ce=^pc:cd=^pC:cl=^p^l:bl=^p^g:"
1278           ;; insert/delete char/line
1279           "IC=^p_%+ :DC=^pd%+ :AL=^p^o%+ :DL=^p^k%+ :"
1280           ;;-- Not-widely-known (ie nonstandard) flags, which mean
1281           ;; o writing in the last column of the last line
1282           ;;   doesn't cause idiotic scrolling, and
1283           ;; o don't use idiotische c-s/c-q sogenannte
1284           ;;   ``flow control'' auf keinen Fall.
1285           "LP:NF:"
1286           ;;-- For stupid or obsolete programs
1287           "ic=^p_!:dc=^pd!:al=^p^o!:dl=^p^k!:ho=^p=  :"
1288           ;;-- For disgusting programs.
1289           ;; (VI? What losers need these, I wonder?)
1290           "im=:ei=:dm=:ed=:mi:do=^p^j:nl=^p^j:bs:")
1291 )
1292
1293 (defun te-tic-sentinel (proc state-change)
1294   "If tic has finished, delete the .tif file"
1295   (if (equal state-change "finished
1296 ")
1297       (delete-file (concat "/tmp/" te-terminal-name ".tif"))))
1298
1299 (provide 'terminal)
1300
1301 ;;; terminal.el ends here