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
  23 ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  24
  25 ;;; Code:
  26
  27 ;;>>TODO
  28 ;;>> ** Nothing can be done about emacs' meta-lossage **
  29 ;;>>  (without redoing keymaps `sanely' -- ask Mly for details)
  30
  31 ;;>> One probably wants to do setenv MORE -c when running with
  32 ;;>>   more-processing enabled.
  33
  34 (require 'ehelp)
  35
  36 (defvar terminal-escape-char ?\C-^
  37   "*All characters except for this are passed verbatim through the
  38 terminal-emulator.  This character acts as a prefix for commands
  39 to the emulator program itself.  Type this character twice to send
  40 it through the emulator.  Type ? after typing it for a list of
  41 possible commands.
  42 This variable is local to each terminal-emulator buffer.")
  43
  44 (defvar terminal-scrolling t ;;>> Setting this to T sort-of defeats my whole aim in writing this package...
  45   "*If non-nil, the terminal-emulator will losingly `scroll' when output occurs
  46 past the bottom of the screen.  If nil, output will win and `wrap' to the top
  47 of the screen.
  48 This variable is local to each terminal-emulator buffer.")
  49
  50 (defvar terminal-more-processing t
  51   "*If non-nil, do more-processing.
  52 This variable is local to each terminal-emulator buffer.")
  53
  54 ;; If you are the sort of loser who uses scrolling without more breaks
  55 ;; and expects to actually see anything, you should probably set this to
  56 ;; around 400
  57 (defvar terminal-redisplay-interval 5000
  58   "*Maximum number of characters which will be processed by the
  59 terminal-emulator before a screen redisplay is forced.
  60 Set this to a large value for greater throughput,
  61 set it smaller for more frequent updates but overall slower
  62 performance.")
  63
  64 (defvar terminal-more-break-insertion
  65   "*** More break -- Press space to continue ***")
  66
  67 (defvar terminal-meta-map nil)
  68 (if terminal-meta-map
  69     nil
  70   (let ((map (make-sparse-keymap)))
  71     (define-key map [t] 'te-pass-through)
  72     (setq terminal-meta-map map)))
  73
  74 (defvar terminal-map nil)
  75 (if terminal-map
  76     nil
  77   (let ((map (make-sparse-keymap)))
  78     (define-key map [t] 'te-pass-through)
  79     (define-key map [switch-frame] 'handle-switch-frame)
  80     (define-key map "\e" terminal-meta-map)
  81     ;(define-key map "\C-l"
  82     ;  '(lambda () (interactive) (te-pass-through) (redraw-display)))
  83     (setq terminal-map map)))
  84
  85 (defvar terminal-escape-map nil)
  86 (if terminal-escape-map
  87     nil
  88   (let ((map (make-sparse-keymap)))
  89     (define-key map [t] 'undefined)
  90     (let ((s "0"))
  91       (while (<= (aref s 0) ?9)
  92         (define-key map s 'digit-argument)
  93         (aset s 0 (1+ (aref s 0)))))
  94     (define-key map "b" 'switch-to-buffer)
  95     (define-key map "o" 'other-window)
  96     (define-key map "e" 'te-set-escape-char)
  97     (define-key map "\C-l" 'redraw-display)
  98     (define-key map "\C-o" 'te-flush-pending-output)
  99     (define-key map "m" 'te-toggle-more-processing)
 100     (define-key map "x" 'te-escape-extended-command)
 101     ;;>> What use is this?  Why is it in the default terminal-emulator map?
 102     (define-key map "w" 'te-edit)
 103     (define-key map "?" 'te-escape-help)
 104     (define-key map (char-to-string help-char) 'te-escape-help)
 105     (setq terminal-escape-map map)))
 106
 107 (defvar te-escape-command-alist nil)
 108 (if te-escape-command-alist
 109     nil
 110   (setq te-escape-command-alist
 111         '(("Set Escape Character" . te-set-escape-char)
 112           ;;>> What use is this?  Why is it in the default terminal-emulator map?
 113           ("Edit" . te-edit)
 114           ("Refresh" . redraw-display)
 115           ("Record Output" . te-set-output-log)
 116           ("Photo" . te-set-output-log)
 117           ("Tofu" . te-tofu) ;; confuse the uninitiated
 118           ("Stuff Input" . te-stuff-string)
 119           ("Flush Pending Output" . te-flush-pending-output)
 120           ("Enable More Processing" . te-enable-more-processing)
 121           ("Disable More Processing" . te-disable-more-processing)
 122           ("Scroll at end of page" . te-do-scrolling)
 123           ("Wrap at end of page" . te-do-wrapping)
 124           ("Switch To Buffer" . switch-to-buffer)
 125           ("Other Window" . other-window)
 126           ("Kill Buffer" . kill-buffer)
 127           ("Help" . te-escape-help)
 128           ("Set Redisplay Interval" . te-set-redisplay-interval)
 129           )))
 130
 131 (defvar terminal-more-break-map nil)
 132 (if terminal-more-break-map
 133     nil
 134   (let ((map (make-sparse-keymap)))
 135     (define-key map [t] 'te-more-break-unread)
 136     (define-key map (char-to-string help-char) 'te-more-break-help)
 137     (define-key map " " 'te-more-break-resume)
 138     (define-key map "\C-l" 'redraw-display)
 139     (define-key map "\C-o" 'te-more-break-flush-pending-output)
 140     ;;>>> this isn't right
 141     ;(define-key map "\^?" 'te-more-break-flush-pending-output) ;DEL
 142     (define-key map "\r" 'te-more-break-advance-one-line)
 143
 144     (setq terminal-more-break-map map)))
 145
 146 \f
 147 ;;; Pacify the byte compiler
 148 (defvar te-process nil)
 149 (defvar te-log-buffer nil)
 150 (defvar te-height nil)
 151 (defvar te-width nil)
 152 (defvar te-more-count nil)
 153 (defvar te-redisplay-count nil)
 154 (defvar te-pending-output nil)
 155 (defvar te-saved-point)
 156 (defvar te-more-old-point nil)
 157 (defvar te-more-old-local-map nil)
 158 (defvar te-more-old-filter nil)
 159 (defvar te-more-old-mode-line-format nil)
 160 (defvar te-pending-output-info nil)
 161
 162 ;; Required to support terminfo systems
 163 (defconst te-terminal-name-prefix "emacs-virtual")
 164 (defvar te-terminal-name nil)
 165 \f
 166 ;;;;  escape map
 167
 168 (defun te-escape ()
 169   (interactive)
 170   (let (s
 171         (local (current-local-map))
 172         (global (current-global-map)))
 173     (unwind-protect
 174         (progn
 175           (use-global-map terminal-escape-map)
 176           (use-local-map terminal-escape-map)
 177           (setq s (read-key-sequence
 178                     (if current-prefix-arg
 179                         (format "Emacs Terminal escape> %d "
 180                                 (prefix-numeric-value current-prefix-arg))
 181                         "Emacs Terminal escape> "))))
 182       (use-global-map global)
 183       (use-local-map local))
 184
 185     (message "")
 186
 187     (cond
 188      ;;  Certain keys give vector notation, like [escape] when
 189      ;;  you hit esc key...
 190      ((and (stringp s)
 191            (string= s (make-string 1 terminal-escape-char)))
 192       (setq last-command-char terminal-escape-char)
 193       (let ((terminal-escape-char -259))
 194         (te-pass-through)))
 195
 196      ((setq s (lookup-key terminal-escape-map s))
 197       (call-interactively s)))
 198
 199     ))
 200
 201
 202 (defun te-escape-help ()
 203   "Provide help on commands available after terminal-escape-char is typed."
 204   (interactive)
 205   (message "Terminal emulator escape help...")
 206   (let ((char (single-key-description terminal-escape-char)))
 207     (with-electric-help
 208       (function (lambda ()
 209          (princ (format "Terminal-emulator escape, invoked by \"%s\"
 210 Type \"%s\" twice to send a single \"%s\" through.
 211
 212 Other chars following \"%s\" are interpreted as follows:\n"
 213                         char char char char))
 214
 215          (princ (substitute-command-keys "\\{terminal-escape-map}\n"))
 216          (princ (format "\nSubcommands of \"%s\" (%s)\n"
 217                         (where-is-internal 'te-escape-extended-command
 218                                            terminal-escape-map t)
 219                         'te-escape-extended-command))
 220          (let ((l (if (fboundp 'sortcar)
 221                       (sortcar (copy-sequence te-escape-command-alist)
 222                                'string<)
 223                       (sort (copy-sequence te-escape-command-alist)
 224                             (function (lambda (a b)
 225                               (string< (car a) (car b))))))))
 226            (while l
 227              (let ((doc (or (documentation (cdr (car l)))
 228                             "Not documented")))
 229                (if (string-match "\n" doc)
 230                    ;; just use first line of documentation
 231                    (setq doc (substring doc 0 (match-beginning 0))))
 232                (princ "  \"")
 233                (princ (car (car l)))
 234                (princ "\":\n     ")
 235                (princ doc)
 236                (write-char ?\n))
 237              (setq l (cdr l))))
 238          nil)))))
 239
 240
 241
 242 (defun te-escape-extended-command ()
 243   (interactive)
 244   (let ((c (let ((completion-ignore-case t))
 245              (completing-read "terminal command: "
 246                               te-escape-command-alist
 247                               nil t))))
 248     (if c
 249         (catch 'foo
 250           (setq c (downcase c))
 251           (let ((l te-escape-command-alist))
 252             (while l
 253               (if (string= c (downcase (car (car l))))
 254                   (throw 'foo (call-interactively (cdr (car l))))
 255                 (setq l (cdr l)))))))))
 256
 257 ;; not used.
 258 (defun te-escape-extended-command-unread ()
 259   (interactive)
 260   (setq unread-command-events (listify-key-sequence (this-command-keys)))
 261   (te-escape-extended-command))
 262
 263 (defun te-set-escape-char (c)
 264   "Change the terminal-emulator escape character."
 265   (interactive "cSet escape character to: ")
 266   (let ((o terminal-escape-char))
 267     (message (if (= o c)
 268                  "\"%s\" is the escape char"
 269                  "\"%s\" is now the escape; \"%s\" passes through")
 270              (single-key-description c)
 271              (single-key-description o))
 272     (setq terminal-escape-char c)))
 273
 274
 275 (defun te-stuff-string (string)
 276   "Read a string to send to through the terminal emulator
 277 as though that string had been typed on the keyboard.
 278
 279 Very poor man's file transfer protocol."
 280   (interactive "sStuff string: ")
 281   (process-send-string te-process string))
 282
 283 (defun te-set-output-log (name)
 284   "Record output from the terminal emulator in a buffer."
 285   (interactive (list (if te-log-buffer
 286                          nil
 287                        (read-buffer "Record output in buffer: "
 288                                     (format "%s output-log"
 289                                             (buffer-name (current-buffer)))
 290                                     nil))))
 291   (if (or (null name) (equal name ""))
 292       (progn (setq te-log-buffer nil)
 293              (message "Output logging off."))
 294     (if (get-buffer name)
 295         nil
 296       (save-excursion
 297         (set-buffer (get-buffer-create name))
 298         (fundamental-mode)
 299         (buffer-disable-undo (current-buffer))
 300         (erase-buffer)))
 301     (setq te-log-buffer (get-buffer name))
 302     (message "Recording terminal emulator output into buffer \"%s\""
 303              (buffer-name te-log-buffer))))
 304
 305 (defun te-tofu ()
 306   "Discontinue output log."
 307   (interactive)
 308   (te-set-output-log nil))
 309
 310
 311 (defun te-toggle (sym arg)
 312   (set sym (cond ((not (numberp arg)) arg)
 313                  ((= arg 1) (not (symbol-value sym)))
 314                  ((< arg 0) nil)
 315                  (t t))))
 316
 317 (defun te-toggle-more-processing (arg)
 318   (interactive "p")
 319   (message (if (te-toggle 'terminal-more-processing arg)
 320                "More processing on" "More processing off"))
 321   (if terminal-more-processing (setq te-more-count -1)))
 322
 323 (defun te-toggle-scrolling (arg)
 324   (interactive "p")
 325   (message (if (te-toggle 'terminal-scrolling arg)
 326                "Scroll at end of page" "Wrap at end of page")))
 327
 328 (defun te-enable-more-processing ()
 329   "Enable ** MORE ** processing"
 330   (interactive)
 331   (te-toggle-more-processing t))
 332
 333 (defun te-disable-more-processing ()
 334   "Disable ** MORE ** processing"
 335   (interactive)
 336   (te-toggle-more-processing nil))
 337
 338 (defun te-do-scrolling ()
 339   "Scroll at end of page (yuck)"
 340   (interactive)
 341   (te-toggle-scrolling t))
 342
 343 (defun te-do-wrapping ()
 344   "Wrap to top of window at end of page"
 345   (interactive)
 346   (te-toggle-scrolling nil))
 347
 348
 349 (defun te-set-redisplay-interval (arg)
 350   "Set the maximum interval (in output characters) between screen updates.
 351 Set this number to large value for greater throughput,
 352 set it smaller for more frequent updates (but overall slower performance."
 353   (interactive "NMax number of output chars between redisplay updates: ")
 354   (setq arg (max arg 1))
 355   (setq terminal-redisplay-interval arg
 356         te-redisplay-count 0))
 357 \f
 358 ;;;; more map
 359
 360 ;; every command -must- call te-more-break-unwind
 361 ;; or grave lossage will result
 362
 363 (put 'te-more-break-unread 'suppress-keymap t)
 364 (defun te-more-break-unread ()
 365   (interactive)
 366   (if (eq last-input-char terminal-escape-char)
 367       (call-interactively 'te-escape)
 368     (message "Continuing from more break (\"%s\" typed, %d chars output pending...)"
 369              (single-key-description last-input-char)
 370              (te-pending-output-length))
 371     (setq te-more-count 259259)
 372     (te-more-break-unwind)
 373     (let ((terminal-more-processing nil))
 374       (te-pass-through))))
 375
 376 (defun te-more-break-resume ()
 377   "Proceed past the **MORE** break,
 378 allowing the next page of output to appear"
 379   (interactive)
 380   (message "Continuing from more break")
 381   (te-more-break-unwind))
 382
 383 (defun te-more-break-help ()
 384   "Provide help on commands available in a terminal-emulator **MORE** break"
 385   (interactive)
 386   (message "Terminal-emulator more break help...")
 387   (sit-for 0)
 388   (with-electric-help
 389     (function (lambda ()
 390       (princ "Terminal-emulator more break.\n\n")
 391       (princ (format "Type \"%s\" (te-more-break-resume)\n%s\n"
 392                      (where-is-internal 'te-more-break-resume
 393                                         terminal-more-break-map t)
 394                      (documentation 'te-more-break-resume)))
 395       (princ (substitute-command-keys "\\{terminal-more-break-map}\n"))
 396       (princ "Any other key is passed through to the program
 397 running under the terminal emulator and disables more processing until
 398 all pending output has been dealt with.")
 399       nil))))
 400
 401
 402 (defun te-more-break-advance-one-line ()
 403   "Allow one more line of text to be output before doing another more break."
 404   (interactive)
 405   (setq te-more-count 1)
 406   (te-more-break-unwind))
 407
 408 (defun te-more-break-flush-pending-output ()
 409   "Discard any output which has been received by the terminal emulator but
 410 not yet processed and then proceed from the more break."
 411   (interactive)
 412   (te-more-break-unwind)
 413   (te-flush-pending-output))
 414
 415 (defun te-flush-pending-output ()
 416   "Discard any as-yet-unprocessed output which has been received by
 417 the terminal emulator."
 418   (interactive)
 419   ;; this could conceivably be confusing in the presence of
 420   ;; escape-sequences spanning process-output chunks
 421   (if (null (cdr te-pending-output))
 422       (message "(There is no output pending)")
 423     (let ((length (te-pending-output-length)))
 424       (message "Flushing %d chars of pending output" length)
 425       (setq te-pending-output
 426             (list 0 (format "\n*** %d chars of pending output flushed ***\n"
 427                             length)))
 428       (te-update-pending-output-display)
 429       (te-process-output nil)
 430       (sit-for 0))))
 431
 432 \f
 433 (defun te-pass-through ()
 434   "Character is passed to the program running under the terminal emulator.
 435 One characters is treated specially:
 436 the terminal escape character (normally C-^)
 437 lets you type a terminal emulator command."
 438   (interactive)
 439   (cond ((eq last-input-char terminal-escape-char)
 440          (call-interactively 'te-escape))
 441         (t
 442          ;; Convert `return' to C-m, etc.
 443          (if (and (symbolp last-input-char)
 444                   (get last-input-char 'ascii-character))
 445              (setq last-input-char (get last-input-char 'ascii-character)))
 446          ;; Convert meta characters to 8-bit form for transmission.
 447          (if (and (integerp last-input-char)
 448                   (not (zerop (logand last-input-char ?\M-\^@))))
 449              (setq last-input-char (+ 128 (logand last-input-char 127))))
 450          ;; Now ignore all but actual characters.
 451          ;; (It ought to be possible to send through function
 452          ;; keys as character sequences if we add a description
 453          ;; to our termcap entry of what they should look like.)
 454          (if (integerp last-input-char)
 455              (progn
 456                (and terminal-more-processing (null (cdr te-pending-output))
 457                     (te-set-more-count nil))
 458                (send-string te-process (make-string 1 last-input-char))
 459                (te-process-output t))
 460            (message "Function key `%s' ignored"
 461                     (single-key-description last-input-char))))))
 462
 463
 464 (defun te-set-window-start ()
 465   (let* ((w (get-buffer-window (current-buffer)))
 466          (h (if w (window-height w))))
 467     (cond ((not w)) ; buffer not displayed
 468           ((>= h (/ (- (point) (point-min)) (1+ te-width)))
 469            ;; this is the normal case
 470            (set-window-start w (point-min)))
 471           ;; this happens if some vandal shrinks our window.
 472           ((>= h (/ (- (point-max) (point)) (1+ te-width)))
 473            (set-window-start w (- (point-max) (* h (1+ te-width)) -1)))
 474           ;; I give up.
 475           (t nil))))
 476
 477 (defun te-pending-output-length ()
 478   (let ((length (car te-pending-output))
 479         (tem (cdr te-pending-output)))
 480     (while tem
 481       (setq length (+ length (length (car tem))) tem (cdr tem)))
 482     length))
 483 \f
 484 ;;>> What use is this terminal-edit stuff anyway?
 485 ;;>>  If nothing else, it was written by somebody who didn't
 486 ;;>>  competently understand the terminal-emulator...
 487
 488 (defvar terminal-edit-map nil)
 489 (if terminal-edit-map
 490     nil
 491   (setq terminal-edit-map (make-sparse-keymap))
 492   (define-key terminal-edit-map "\C-c\C-c" 'terminal-cease-edit))
 493
 494 ;; Terminal Edit mode is suitable only for specially formatted data.
 495 (put 'terminal-edit-mode 'mode-class 'special)
 496
 497 (defun terminal-edit-mode ()
 498   "Major mode for editing the contents of a terminal-emulator buffer.
 499 The editing commands are the same as in Fundamental mode,
 500 together with a command \\<terminal-edit-map>to return to terminal emulation: \\[terminal-cease-edit]."
 501   (use-local-map terminal-edit-map)
 502   (setq major-mode 'terminal-edit-mode)
 503   (setq mode-name "Terminal Edit")
 504   (setq mode-line-modified (default-value 'mode-line-modified))
 505   (setq mode-line-process nil)
 506   (run-hooks 'terminal-edit-mode-hook))
 507
 508 (defun te-edit ()
 509   "Start editing the terminal emulator buffer with ordinary Emacs commands."
 510   (interactive)
 511   (terminal-edit-mode)
 512   (force-mode-line-update)
 513   ;; Make mode line update.
 514   (if (eq (key-binding "\C-c\C-c") 'terminal-cease-edit)
 515       (message "Editing: Type C-c C-c to return to Terminal")
 516     (message (substitute-command-keys
 517                "Editing: Type \\[terminal-cease-edit] to return to Terminal"))))
 518
 519 (defun terminal-cease-edit ()
 520   "Finish editing message; switch back to Terminal proper."
 521   (interactive)
 522
 523   ;;>> emulator will blow out if buffer isn't exactly te-width x te-height
 524   (let ((buffer-read-only nil))
 525     (widen)
 526     (let ((opoint (point-marker))
 527           (width te-width)
 528           (h (1- te-height)))
 529       (goto-char (point-min))
 530       (while (>= h 0)
 531         (let ((p (point)))
 532           (cond ((search-forward "\n" (+ p width) 'move)
 533                  (forward-char -1)
 534                  (insert-char ?\  (- width (- (point) p)))
 535                  (forward-char 1))
 536                 ((eobp)
 537                  (insert-char ?\  (- width (- (point) p))))
 538                 ((= (following-char) ?\n)
 539                  (forward-char 1))
 540                 (t
 541                  (setq p (point))
 542                  (if (search-forward "\n" nil t)
 543                      (delete-region p (1- (point)))
 544                      (delete-region p (point-max))))))
 545         (if (= h 0)
 546             (if (not (eobp)) (delete-region (point) (point-max)))
 547             (if (eobp) (insert ?\n)))
 548         (setq h (1- h)))
 549       (goto-char opoint)
 550       (set-marker opoint nil nil)
 551       (setq te-saved-point (point))
 552       (setq te-redisplay-count 0)
 553       (setq te-more-count -1)))
 554
 555   (setq mode-line-modified (default-value 'mode-line-modified))
 556   (use-local-map terminal-map)
 557   (setq major-mode 'terminal-mode)
 558   (setq mode-name "terminal")
 559   (setq mode-line-process '(":%s")))
 560 \f
 561 ;;;; more break hair
 562
 563 (defun te-more-break ()
 564   (te-set-more-count t)
 565   (make-local-variable 'te-more-old-point)
 566   (setq te-more-old-point (point))
 567   (make-local-variable 'te-more-old-local-map)
 568   (setq te-more-old-local-map (current-local-map))
 569   (use-local-map terminal-more-break-map)
 570   (make-local-variable 'te-more-old-filter)
 571   (setq te-more-old-filter (process-filter te-process))
 572   (make-local-variable 'te-more-old-mode-line-format)
 573   (setq te-more-old-mode-line-format mode-line-format
 574         mode-line-format (list "--   **MORE**  "
 575                                mode-line-buffer-identification
 576                                "%-"))
 577   (set-process-filter te-process
 578     (function (lambda (process string)
 579                 (save-excursion
 580                   (set-buffer (process-buffer process))
 581                   (setq te-pending-output (nconc te-pending-output
 582                                                  (list string))))
 583                   (te-update-pending-output-display))))
 584   (te-update-pending-output-display)
 585   (if (eq (window-buffer (selected-window)) (current-buffer))
 586       (message "More break "))
 587   (or (eobp)
 588       (null terminal-more-break-insertion)
 589       (save-excursion
 590         (forward-char 1)
 591         (delete-region (point) (+ (point) te-width))
 592         (insert terminal-more-break-insertion)))
 593   (run-hooks 'terminal-more-break-hook)
 594   (sit-for 0) ;get display to update
 595   (throw 'te-process-output t))
 596
 597 (defun te-more-break-unwind ()
 598   (use-local-map te-more-old-local-map)
 599   (set-process-filter te-process te-more-old-filter)
 600   (goto-char te-more-old-point)
 601   (setq mode-line-format te-more-old-mode-line-format)
 602   (force-mode-line-update)
 603   (let ((buffer-read-only nil))
 604     (cond ((eobp))
 605           (terminal-more-break-insertion
 606            (forward-char 1)
 607            (delete-region (point)
 608                           (+ (point) (length terminal-more-break-insertion)))
 609            (insert-char ?\  te-width)
 610            (goto-char te-more-old-point)))
 611     (setq te-more-old-point nil)
 612     (let ((te-more-count 259259))
 613       (te-newline)))
 614   ;(sit-for 0)
 615   (te-process-output t))
 616
 617 (defun te-set-more-count (newline)
 618   (let ((line (/ (- (point) (point-min)) (1+ te-width))))
 619     (if newline (setq line (1+ line)))
 620     (cond ((= line te-height)
 621            (setq te-more-count te-height))
 622           ;>>>> something is strange.  Investigate this!
 623           ((= line (1- te-height))
 624            (setq te-more-count te-height))
 625           ((or (< line (/ te-height 2))
 626                (> (- te-height line) 10))
 627            ;; break at end of this page
 628            (setq te-more-count (- te-height line)))
 629           (t
 630            ;; migrate back towards top (ie bottom) of screen.
 631            (setq te-more-count (- te-height
 632                                   (if (> te-height 10) 2 1)))))))
 633
 634 \f
 635 ;;;; More or less straight-forward terminal escapes
 636
 637 ;; ^j, meaning `newline' to non-display programs.
 638 ;; (Who would think of ever writing a system which doesn't understand
 639 ;;  display terminals natively?  Un*x:  The Operating System of the Future.)
 640 (defun te-newline ()
 641   "Move down a line, optionally do more processing, perhaps wrap/scroll,
 642 move to start of new line, clear to end of line."
 643   (end-of-line)
 644   (cond ((not terminal-more-processing))
 645         ((< (setq te-more-count (1- te-more-count)) 0)
 646          (te-set-more-count t))
 647         ((eql te-more-count 0)
 648          ;; this doesn't return
 649          (te-more-break)))
 650   (if (eobp)
 651       (progn
 652         (delete-region (point-min) (+ (point-min) te-width))
 653         (goto-char (point-min))
 654         (if terminal-scrolling
 655             (progn (delete-char 1)
 656                    (goto-char (point-max))
 657                    (insert ?\n))))
 658     (forward-char 1)
 659     (delete-region (point) (+ (point) te-width)))
 660   (insert-char ?\  te-width)
 661   (beginning-of-line)
 662   (te-set-window-start))
 663
 664 ; ^p = x+32 y+32
 665 (defun te-move-to-position ()
 666   ;; must offset by #o40 since cretinous unix won't send a 004 char through
 667   (let ((y (- (te-get-char) 32))
 668         (x (- (te-get-char) 32)))
 669     (if (or (> x te-width)
 670             (> y te-height))
 671         ()
 672       (goto-char (+ (point-min) x (* y (1+ te-width))))
 673       ;(te-set-window-start?)
 674       ))
 675   (setq te-more-count -1))
 676
 677
 678
 679 ;; ^p c
 680 (defun te-clear-rest-of-line ()
 681   (save-excursion
 682     (let ((n (- (point) (progn (end-of-line) (point)))))
 683       (delete-region (point) (+ (point) n))
 684       (insert-char ?\  (- n)))))
 685
 686
 687 ;; ^p C
 688 (defun te-clear-rest-of-screen ()
 689   (save-excursion
 690     (te-clear-rest-of-line)
 691     (while (progn (end-of-line) (not (eobp)))
 692       (forward-char 1) (end-of-line)
 693       (delete-region (- (point) te-width) (point))
 694       (insert-char ?\  te-width))))
 695
 696
 697 ;; ^p ^l
 698 (defun te-clear-screen ()
 699   ;; regenerate buffer to compensate for (nonexistent!!) bugs.
 700   (erase-buffer)
 701   (let ((i 0))
 702     (while (< i te-height)
 703       (setq i (1+ i))
 704       (insert-char ?\  te-width)
 705       (insert ?\n)))
 706   (delete-region (1- (point-max)) (point-max))
 707   (goto-char (point-min))
 708   (setq te-more-count -1))
 709
 710
 711 ;; ^p ^o count+32
 712 (defun te-insert-lines ()
 713   (if (not (bolp))
 714       ();(error "fooI")
 715     (save-excursion
 716       (let* ((line (- te-height (/ (- (point) (point-min)) (1+ te-width)) -1))
 717              (n (min (- (te-get-char) ?\ ) line))
 718              (i 0))
 719         (delete-region (- (point-max) (* n (1+ te-width))) (point-max))
 720         (if (eql (point) (point-max)) (insert ?\n))
 721         (while (< i n)
 722           (setq i (1+ i))
 723           (insert-char ?\  te-width)
 724           (or (eql i line) (insert ?\n))))))
 725   (setq te-more-count -1))
 726
 727
 728 ;; ^p ^k count+32
 729 (defun te-delete-lines ()
 730   (if (not (bolp))
 731       ();(error "fooD")
 732     (let* ((line (- te-height (/ (- (point) (point-min)) (1+ te-width)) -1))
 733            (n (min (- (te-get-char) ?\ ) line))
 734            (i 0))
 735       (delete-region (point)
 736                      (min (+ (point) (* n (1+ te-width))) (point-max)))
 737       (save-excursion
 738         (goto-char (point-max))
 739         (while (< i n)
 740           (setq i (1+ i))
 741           (insert-char ?\  te-width)
 742           (or (eql i line) (insert ?\n))))))
 743   (setq te-more-count -1))
 744
 745 ;; ^p ^a
 746 (defun te-beginning-of-line ()
 747   (beginning-of-line))
 748
 749 ;; ^p ^b
 750 (defun te-backward-char ()
 751   (if (not (bolp))
 752       (backward-char 1)))
 753
 754 ;; ^p ^f
 755 (defun te-forward-char ()
 756   (if (not (eolp))
 757       (forward-char 1)))
 758
 759 \f
 760 ;; 0177
 761 (defun te-delete ()
 762   (if (bolp)
 763       ()
 764     (delete-region (1- (point)) (point))
 765     (insert ?\ )
 766     (forward-char -1)))
 767
 768 ;; ^p ^g
 769 (defun te-beep ()
 770   (beep))
 771
 772
 773 ;; ^p _ count+32
 774 (defun te-insert-spaces ()
 775   (let* ((p (point))
 776          (n (min (- (te-get-char) 32)
 777                  (- (progn (end-of-line) (point)) p))))
 778     (if (<= n 0)
 779         nil
 780       (delete-char (- n))
 781       (goto-char p)
 782       (insert-char ?\  n))
 783     (goto-char p)))
 784
 785 ;; ^p d count+32  (should be ^p ^d but cretinous un*x won't send ^d chars!!!)
 786 (defun te-delete-char ()
 787   (let* ((p (point))
 788          (n (min (- (te-get-char) 32)
 789                  (- (progn (end-of-line) (point)) p))))
 790     (if (<= n 0)
 791         nil
 792       (insert-char ?\  n)
 793       (goto-char p)
 794       (delete-char n))
 795     (goto-char p)))
 796
 797
 798 \f
 799 ;; disgusting unix-required shit
 800 ;;  Are we living twenty years in the past yet?
 801
 802 (defun te-losing-unix ()
 803   nil)
 804
 805 ;; ^i
 806 (defun te-output-tab ()
 807   (let* ((p (point))
 808          (x (- p (progn (beginning-of-line) (point))))
 809          (l (min (- 8 (logand x 7))
 810                  (progn (end-of-line) (- (point) p)))))
 811     (goto-char (+ p l))))
 812
 813 ;; ^p ^j
 814 ;; Handle the `do' or `nl' termcap capability.
 815 ;;>> I am not sure why this broken, obsolete, capability is here.
 816 ;;>> Perhaps it is for VIle.  No comment was made about why it
 817 ;;>> was added (in "Sun Dec  6 01:22:27 1987  Richard Stallman")
 818 (defun te-down-vertically-or-scroll ()
 819   "Move down a line vertically, or scroll at bottom."
 820   (let ((column (current-column)))
 821     (end-of-line)
 822     (if (eobp)
 823         (progn
 824           (delete-region (point-min) (+ (point-min) te-width))
 825           (goto-char (point-min))
 826           (delete-char 1)
 827           (goto-char (point-max))
 828           (insert ?\n)
 829           (insert-char ?\  te-width)
 830           (beginning-of-line))
 831       (forward-line 1))
 832     (move-to-column column))
 833   (te-set-window-start))
 834
 835 ;; Also:
 836 ;;  ^m => beginning-of-line (for which it -should- be using ^p ^a, right?!!)
 837 ;;  ^g => te-beep (for which it should use ^p ^g)
 838 ;;  ^h => te-backward-char (for which it should use ^p ^b)
 839
 840 \f
 841
 842 (defun te-filter (process string)
 843   (let* ((obuf (current-buffer)))
 844     ;; can't use save-excursion, as that preserves point, which we don't want
 845     (unwind-protect
 846         (progn
 847           (set-buffer (process-buffer process))
 848           (goto-char te-saved-point)
 849           (and (bufferp te-log-buffer)
 850                (if (null (buffer-name te-log-buffer))
 851                    ;; killed
 852                    (setq te-log-buffer nil)
 853                  (set-buffer te-log-buffer)
 854                  (goto-char (point-max))
 855                  (insert-before-markers string)
 856                  (set-buffer (process-buffer process))))
 857           (setq te-pending-output (nconc te-pending-output (list string)))
 858           (te-update-pending-output-display)
 859           (te-process-output (eq (current-buffer)
 860                                  (window-buffer (selected-window))))
 861           (set-buffer (process-buffer process))
 862           (setq te-saved-point (point)))
 863       (set-buffer obuf))))
 864
 865 ;; (A version of the following comment which might be distractingly offensive
 866 ;; to some readers has been moved to term-nasty.el.)
 867 ;; unix lacks ITS-style tty control...
 868 (defun te-process-output (preemptible)
 869   ;;>> There seems no good reason to ever disallow preemption
 870   (setq preemptible t)
 871   (catch 'te-process-output
 872     (let ((buffer-read-only nil)
 873           (string nil) ostring start char (matchpos nil))
 874       (while (cdr te-pending-output)
 875         (setq ostring string
 876               start (car te-pending-output)
 877               string (car (cdr te-pending-output))
 878               char (aref string start))
 879         (if (eql (setq start (1+ start)) (length string))
 880             (progn (setq te-pending-output
 881                            (cons 0 (cdr (cdr te-pending-output)))
 882                          start 0
 883                          string (car (cdr te-pending-output)))
 884                    (te-update-pending-output-display))
 885             (setcar te-pending-output start))
 886         (if (and (> char ?\037) (< char ?\377))
 887             (cond ((eolp)
 888                    ;; unread char
 889                    (if (eql start 0)
 890                        (setq te-pending-output
 891                              (cons 0 (cons (make-string 1 char)
 892                                            (cdr te-pending-output))))
 893                        (setcar te-pending-output (1- start)))
 894                    (te-newline))
 895                   ((null string)
 896                    (delete-char 1) (insert char)
 897                    (te-redisplay-if-necessary 1))
 898                   (t
 899                    (let ((end (or (and (eq ostring string) matchpos)
 900                                   (setq matchpos (string-match
 901                                                    "[\000-\037\177-\377]"
 902                                                    string start))
 903                                   (length string))))
 904                      (delete-char 1) (insert char)
 905                      (setq char (point)) (end-of-line)
 906                      (setq end (min end (+ start (- (point) char))))
 907                      (goto-char char)
 908                      (if (eql end matchpos) (setq matchpos nil))
 909                      (delete-region (point) (+ (point) (- end start)))
 910                      (insert (if (and (eql start 0)
 911                                       (eql end (length string)))
 912                                  string
 913                                  (substring string start end)))
 914                      (if (eql end (length string))
 915                          (setq te-pending-output
 916                                (cons 0 (cdr (cdr te-pending-output))))
 917                          (setcar te-pending-output end))
 918                      (te-redisplay-if-necessary (1+ (- end start))))))
 919           ;; I suppose if I split the guts of this out into a separate
 920           ;;  function we could trivially emulate different terminals
 921           ;; Who cares in any case?  (Apart from stupid losers using rlogin)
 922           (funcall
 923             (if (eql char ?\^p)
 924                 (or (cdr (assq (te-get-char)
 925                                '((?= . te-move-to-position)
 926                                  (?c . te-clear-rest-of-line)
 927                                  (?C . te-clear-rest-of-screen)
 928                                  (?\C-o . te-insert-lines)
 929                                  (?\C-k . te-delete-lines)
 930                                  ;; not necessary, but help sometimes.
 931                                  (?\C-a . te-beginning-of-line)
 932                                  (?\C-b . te-backward-char)
 933                                  ;; should be C-d, but un*x
 934                                  ;;  pty's won't send \004 through!
 935                                  ;; Can you believe this?
 936                                  (?d . te-delete-char)
 937                                  (?_ . te-insert-spaces)
 938                                  ;; random
 939                                  (?\C-f . te-forward-char)
 940                                  (?\C-g . te-beep)
 941                                  (?\C-j . te-down-vertically-or-scroll)
 942                                  (?\C-l . te-clear-screen)
 943                                  )))
 944                     'te-losing-unix)
 945                 (or (cdr (assq char
 946                                '((?\C-j . te-newline)
 947                                  (?\177 . te-delete)
 948                                  ;; Did I ask to be sent these characters?
 949                                  ;; I don't remember doing so, either.
 950                                  ;; (Perhaps some operating system or
 951                                  ;; other is completely incompetent...)
 952                                  (?\C-m . te-beginning-of-line)
 953                                  (?\C-g . te-beep)
 954                                  (?\C-h . te-backward-char)
 955                                  (?\C-i . te-output-tab))))
 956                     'te-losing-unix)))
 957           (te-redisplay-if-necessary 1))
 958         (and preemptible
 959              (input-pending-p)
 960              ;; preemptible output!  Oh my!!
 961              (throw 'te-process-output t)))))
 962   ;; We must update window-point in every window displaying our buffer
 963   (let* ((s (selected-window))
 964          (w s))
 965     (while (not (eq s (setq w (next-window w))))
 966       (if (eq (window-buffer w) (current-buffer))
 967           (set-window-point w (point))))))
 968
 969 (defun te-get-char ()
 970   (if (cdr te-pending-output)
 971       (let ((start (car te-pending-output))
 972             (string (car (cdr te-pending-output))))
 973         (prog1 (aref string start)
 974           (if (eql (setq start (1+ start)) (length string))
 975               (setq te-pending-output (cons 0 (cdr (cdr te-pending-output))))
 976               (setcar te-pending-output start))))
 977     (catch 'char
 978       (let ((filter (process-filter te-process)))
 979         (unwind-protect
 980             (progn
 981               (set-process-filter te-process
 982                                   (function (lambda (p s)
 983                                     (or (eql (length s) 1)
 984                                         (setq te-pending-output (list 1 s)))
 985                                     (throw 'char (aref s 0)))))
 986               (accept-process-output te-process))
 987           (set-process-filter te-process filter))))))
 988
 989
 990 (defun te-redisplay-if-necessary (length)
 991   (and (<= (setq te-redisplay-count (- te-redisplay-count length)) 0)
 992        (eq (current-buffer) (window-buffer (selected-window)))
 993        (waiting-for-user-input-p)
 994        (progn (te-update-pending-output-display)
 995               (sit-for 0)
 996               (setq te-redisplay-count terminal-redisplay-interval))))
 997
 998 (defun te-update-pending-output-display ()
 999   (if (null (cdr te-pending-output))
1000       (setq te-pending-output-info "")
1001     (let ((length (te-pending-output-length)))
1002       (if (< length 1500)
1003           (setq te-pending-output-info "")
1004         (setq te-pending-output-info (format "(%dK chars output pending) "
1005                                              (/ (+ length 512) 1024))))))
1006   (force-mode-line-update))
1007
1008 \f
1009 (defun te-sentinel (process message)
1010   (cond ((eq (process-status process) 'run))
1011         ((null (buffer-name (process-buffer process)))) ;deleted
1012         (t (let ((b (current-buffer)))
1013              (save-excursion
1014                (set-buffer (process-buffer process))
1015                (setq buffer-read-only nil)
1016                (fundamental-mode)
1017                (goto-char (point-max))
1018                (delete-blank-lines)
1019                (delete-horizontal-space)
1020                (insert "\n*******\n" message "*******\n"))
1021              (if (and (eq b (process-buffer process))
1022                       (waiting-for-user-input-p))
1023                  (progn (goto-char (point-max))
1024                         (recenter -1)))))))
1025 \f
1026 (defvar te-stty-string "stty -nl erase '^?' kill '^u' intr '^c' echo pass8"
1027   "Shell command to set terminal modes for terminal emulator.")
1028 ;; This used to have `new' in it, but that loses outside BSD
1029 ;; and it's apparently not needed in BSD.
1030
1031 (defvar explicit-shell-file-name nil
1032   "*If non-nil, is file name to use for explicitly requested inferior shell.")
1033
1034 ;;;###autoload
1035 (defun terminal-emulator (buffer program args &optional width height)
1036   "Under a display-terminal emulator in BUFFER, run PROGRAM on arguments ARGS.
1037 ARGS is a list of argument-strings.  Remaining arguments are WIDTH and HEIGHT.
1038 BUFFER's contents are made an image of the display generated by that program,
1039 and any input typed when BUFFER is the current Emacs buffer is sent to that
1040 program an keyboard input.
1041
1042 Interactively, BUFFER defaults to \"*terminal*\" and PROGRAM and ARGS
1043 are parsed from an input-string using your usual shell.
1044 WIDTH and HEIGHT are determined from the size of the current window
1045 -- WIDTH will be one less than the window's width, HEIGHT will be its height.
1046
1047 To switch buffers and leave the emulator, or to give commands
1048 to the emulator itself (as opposed to the program running under it),
1049 type Control-^.  The following character is an emulator command.
1050 Type Control-^ twice to send it to the subprogram.
1051 This escape character may be changed using the variable `terminal-escape-char'.
1052
1053 `Meta' characters may not currently be sent through the terminal emulator.
1054
1055 Here is a list of some of the variables which control the behaviour
1056 of the emulator -- see their documentation for more information:
1057 terminal-escape-char, terminal-scrolling, terminal-more-processing,
1058 terminal-redisplay-interval.
1059
1060 This function calls the value of terminal-mode-hook if that exists
1061 and is non-nil after the terminal buffer has been set up and the
1062 subprocess started."
1063   (interactive
1064     (cons (save-excursion
1065             (set-buffer (get-buffer-create "*terminal*"))
1066             (buffer-name (if (or (not (boundp 'te-process))
1067                                  (null te-process)
1068                                  (not (eq (process-status te-process)
1069                                           'run)))
1070                              (current-buffer)
1071                            (generate-new-buffer "*terminal*"))))
1072           (append
1073             (let* ((default-s
1074                      ;; Default shell is same thing M-x shell uses.
1075                      (or explicit-shell-file-name
1076                          (getenv "ESHELL")
1077                          (getenv "SHELL")
1078                          "/bin/sh"))
1079                    (s (read-string
1080                        (format "Run program in emulator: (default %s) "
1081                                default-s))))
1082               (if (equal s "")
1083                   (list default-s '())
1084                 (te-parse-program-and-args s))))))
1085   (switch-to-buffer buffer)
1086   (if (null width) (setq width (- (window-width (selected-window)) 1)))
1087   (if (null height) (setq height (- (window-height (selected-window)) 1)))
1088   (terminal-mode)
1089   (setq te-width width te-height height)
1090   (setq te-terminal-name (concat te-terminal-name-prefix "-" te-width
1091                                  te-height))
1092   (setq mode-line-buffer-identification
1093         (list (format "Emacs terminal %dx%d: %%b  " te-width te-height)
1094               'te-pending-output-info))
1095   (let ((buffer-read-only nil))
1096     (te-clear-screen))
1097   (let (process)
1098     (while (setq process (get-buffer-process (current-buffer)))
1099       (if (y-or-n-p (format "Kill process %s? " (process-name process)))
1100           (delete-process process)
1101         (error "Process %s not killed" (process-name process)))))
1102   (condition-case err
1103       (let ((process-environment
1104              (cons (concat "TERM=" te-terminal-name)
1105                    (cons (concat "TERMCAP=" (te-create-termcap))
1106                          (cons (concat "TERMINFO=" (te-create-terminfo))
1107                                process-environment)))))
1108         (setq te-process
1109               (start-process "terminal-emulator" (current-buffer)
1110                              "/bin/sh" "-c"
1111                              ;; Yuck!!! Start a shell to set some terminal
1112                              ;; control characteristics.  Then start the
1113                              ;; "env" program to setup the terminal type
1114                              ;; Then finally start the program we wanted.
1115                              (format "%s; exec %s"
1116                                      te-stty-string
1117                                      (mapconcat 'te-quote-arg-for-sh
1118                                                 (cons program args) " "))))
1119         (set-process-filter te-process 'te-filter)
1120         (set-process-sentinel te-process 'te-sentinel))
1121     (error (fundamental-mode)
1122            (signal (car err) (cdr err))))
1123   (setq inhibit-quit t)                 ;sport death
1124   (use-local-map terminal-map)
1125   (run-hooks 'terminal-mode-hook)
1126   (message "Entering emacs terminal-emulator...  Type %s %s for help"
1127            (single-key-description terminal-escape-char)
1128            (mapconcat 'single-key-description
1129                       (where-is-internal 'te-escape-help terminal-escape-map t)
1130                       " ")))
1131
1132
1133 (defun te-parse-program-and-args (s)
1134   (cond ((string-match "\\`\\([-a-zA-Z0-9+=_.@/:]+[ \t]*\\)+\\'" s)
1135          (let ((l ()) (p 0))
1136            (while p
1137              (setq l (cons (if (string-match
1138                                 "\\([-a-zA-Z0-9+=_.@/:]+\\)\\([ \t]+\\)*"
1139                                 s p)
1140                                (prog1 (substring s p (match-end 1))
1141                                  (setq p (match-end 0))
1142                                  (if (eql p (length s)) (setq p nil)))
1143                                (prog1 (substring s p)
1144                                  (setq p nil)))
1145                            l)))
1146            (setq l (nreverse l))
1147            (list (car l) (cdr l))))
1148         ((and (string-match "[ \t]" s) (not (file-exists-p s)))
1149          (list shell-file-name (list "-c" (concat "exec " s))))
1150         (t (list s ()))))
1151
1152 (put 'terminal-mode 'mode-class 'special)
1153 ;; This is only separated out from function terminal-emulator
1154 ;; to keep the latter a little more manageable.
1155 (defun terminal-mode ()
1156   "Set up variables for use with the terminal-emulator.
1157 One should not call this -- it is an internal function
1158 of the terminal-emulator"
1159   (kill-all-local-variables)
1160   (buffer-disable-undo (current-buffer))
1161   (setq major-mode 'terminal-mode)
1162   (setq mode-name "terminal")
1163 ; (make-local-variable 'Helper-return-blurb)
1164 ; (setq Helper-return-blurb "return to terminal simulator")
1165   (setq mode-line-process '(":%s"))
1166   (setq buffer-read-only t)
1167   (setq truncate-lines t)
1168   (make-local-variable 'terminal-escape-char)
1169   (setq terminal-escape-char (default-value 'terminal-escape-char))
1170   (make-local-variable 'terminal-scrolling)
1171   (setq terminal-scrolling (default-value 'terminal-scrolling))
1172   (make-local-variable 'terminal-more-processing)
1173   (setq terminal-more-processing (default-value 'terminal-more-processing))
1174   (make-local-variable 'terminal-redisplay-interval)
1175   (setq terminal-redisplay-interval (default-value 'terminal-redisplay-interval))
1176   (make-local-variable 'te-width)
1177   (make-local-variable 'te-height)
1178   (make-local-variable 'te-process)
1179   (make-local-variable 'te-pending-output)
1180   (setq te-pending-output (list 0))
1181   (make-local-variable 'te-saved-point)
1182   (setq te-saved-point (point-min))
1183   (make-local-variable 'te-pending-output-info) ;for the mode line
1184   (setq te-pending-output-info "")
1185   (make-local-variable 'inhibit-quit)
1186   ;(setq inhibit-quit t)
1187   (make-local-variable 'te-log-buffer)
1188   (setq te-log-buffer nil)
1189   (make-local-variable 'te-more-count)
1190   (setq te-more-count -1)
1191   (make-local-variable 'te-redisplay-count)
1192   (setq te-redisplay-count terminal-redisplay-interval)
1193   ;(use-local-map terminal-mode-map)
1194   ;; terminal-mode-hook is called above in function terminal-emulator
1195   )
1196 \f
1197 ;;;; what a complete loss
1198
1199 (defun te-quote-arg-for-sh (string)
1200   (cond ((string-match "\\`[-a-zA-Z0-9+=_.@/:]+\\'"
1201                        string)
1202          string)
1203         ((not (string-match "[$]" string))
1204          ;; "[\"\\]" are special to sh and the lisp reader in the same way
1205          (prin1-to-string string))
1206         (t
1207          (let ((harder "")
1208                (start 0)
1209                (end 0))
1210            (while (cond ((>= start (length string))
1211                          nil)
1212                         ;; this is the set of chars magic with "..." in `sh'
1213                         ((setq end (string-match "[\"\\$]"
1214                                                  string start))
1215                          t)
1216                         (t (setq harder (concat harder
1217                                                 (substring string start)))
1218                            nil))
1219              (setq harder (concat harder (substring string start end)
1220                                   ;; Can't use ?\\ since `concat'
1221                                   ;; unfortunately does prin1-to-string
1222                                   ;; on fixna.  Amazing.
1223                                   "\\"
1224                                   (substring string
1225                                              end
1226                                              (1+ end)))
1227                    start (1+ end)))
1228            (concat "\"" harder "\"")))))
1229
1230 (defun te-create-terminfo ()
1231   "Create and compile a terminfo entry for the virtual terminal. This is kept
1232 in the /tmp directory"
1233   (if (and system-uses-terminfo
1234            (not (file-exists-p (concat  "/tmp/"
1235                                         (substring te-terminal-name-prefix 0 1)
1236                                         "/" te-terminal-name))))
1237     (let ( (terminfo
1238             (concat
1239              (format "%s,mir, xon,cols#%d, lines#%d,"
1240                      te-terminal-name te-width te-height)
1241              "bel=^P^G, clear=^P\\f, cr=^P^A, cub1=^P^B, cud1=^P\\n,"
1242              "cuf1=^P^F, cup=^P=%p1%'\\s'%+%c%p2%'\\s'%+%c,"
1243              "dch=^Pd%p1%'\\s'%+%c, dch1=^Pd!, dl=^P^K%p1%'\\s'%+%c,"
1244              "dl1=^P^K!, ed=^PC, el=^Pc, home=^P=\\s\\s,"
1245              "ich=^P_%p1%'\\s'%+%c, ich1=^P_!, il=^P^O%p1%'\\s'%+%c,"
1246              "il1=^P^O!, ind=^P\\n, nel=\\n,"))
1247            (file-name (concat "/tmp/" te-terminal-name ".tif")) )
1248       (save-excursion
1249         (set-buffer (create-file-buffer file-name))
1250         (insert terminfo)
1251         (write-file file-name)
1252         (kill-buffer nil)
1253         )
1254       (let ( (process-environment
1255               (cons (concat "TERMINFO=" "/tmp")
1256                     process-environment)) )
1257         (set-process-sentinel (start-process "tic" nil "tic" file-name)
1258                               'te-tic-sentinel))))
1259     "/tmp"
1260 )
1261
1262 (defun te-create-termcap ()
1263   "Create a termcap entry for the virtual terminal"
1264   ;; Because of Unix Brain Death(tm), we can't change
1265   ;;  the terminal type of a running process, and so
1266   ;;  terminal size and scrollability are wired-down
1267   ;;  at this point.  ("Detach?  What's that?")
1268   (concat (format "%s:co#%d:li#%d:%s"
1269                   ;; Sigh.  These can't be dynamically changed.
1270                   te-terminal-name te-width te-height (if terminal-scrolling
1271                                          "" "ns:"))
1272           ;;-- Basic things
1273           ;; cursor-motion, bol, forward/backward char
1274           "cm=^p=%+ %+ :cr=^p^a:le=^p^b:nd=^p^f:"
1275           ;; newline, clear eof/eof, audible bell
1276           "nw=^j:ce=^pc:cd=^pC:cl=^p^l:bl=^p^g:"
1277           ;; insert/delete char/line
1278           "IC=^p_%+ :DC=^pd%+ :AL=^p^o%+ :DL=^p^k%+ :"
1279           ;;-- Not-widely-known (ie nonstandard) flags, which mean
1280           ;; o writing in the last column of the last line
1281           ;;   doesn't cause idiotic scrolling, and
1282           ;; o don't use idiotische c-s/c-q sogenannte
1283           ;;   ``flow control'' auf keinen Fall.
1284           "LP:NF:"
1285           ;;-- For stupid or obsolete programs
1286           "ic=^p_!:dc=^pd!:al=^p^o!:dl=^p^k!:ho=^p=  :"
1287           ;;-- For disgusting programs.
1288           ;; (VI? What losers need these, I wonder?)
1289           "im=:ei=:dm=:ed=:mi:do=^p^j:nl=^p^j:bs:")
1290 )
1291
1292 (defun te-tic-sentinel (proc state-change)
1293   "If tic has finished, delete the .tif file"
1294   (if (equal state-change "finished
1295 ")
1296       (delete-file (concat "/tmp/" te-terminal-name ".tif"))))
1297
1298 (provide 'terminal)
1299
1300 ;;; terminal.el ends here