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 "%s"
 518              (substitute-command-keys
 519                "Editing: Type \\[terminal-cease-edit] to return to Terminal"))))
 520
 521 (defun terminal-cease-edit ()
 522   "Finish editing message; switch back to Terminal proper."
 523   (interactive)
 524
 525   ;;>> emulator will blow out if buffer isn't exactly te-width x te-height
 526   (let ((buffer-read-only nil))
 527     (widen)
 528     (let ((opoint (point-marker))
 529           (width te-width)
 530           (h (1- te-height)))
 531       (goto-char (point-min))
 532       (while (>= h 0)
 533         (let ((p (point)))
 534           (cond ((search-forward "\n" (+ p width) 'move)
 535                  (forward-char -1)
 536                  (insert-char ?\  (- width (- (point) p)))
 537                  (forward-char 1))
 538                 ((eobp)
 539                  (insert-char ?\  (- width (- (point) p))))
 540                 ((= (following-char) ?\n)
 541                  (forward-char 1))
 542                 (t
 543                  (setq p (point))
 544                  (if (search-forward "\n" nil t)
 545                      (delete-region p (1- (point)))
 546                      (delete-region p (point-max))))))
 547         (if (= h 0)
 548             (if (not (eobp)) (delete-region (point) (point-max)))
 549             (if (eobp) (insert ?\n)))
 550         (setq h (1- h)))
 551       (goto-char opoint)
 552       (set-marker opoint nil nil)
 553       (setq te-saved-point (point))
 554       (setq te-redisplay-count 0)
 555       (setq te-more-count -1)))
 556
 557   (setq mode-line-modified (default-value 'mode-line-modified))
 558   (use-local-map terminal-map)
 559   (setq major-mode 'terminal-mode)
 560   (setq mode-name "terminal")
 561   (setq mode-line-process '(":%s")))
 562 \f
 563 ;;;; more break hair
 564
 565 (defun te-more-break ()
 566   (te-set-more-count t)
 567   (make-local-variable 'te-more-old-point)
 568   (setq te-more-old-point (point))
 569   (make-local-variable 'te-more-old-local-map)
 570   (setq te-more-old-local-map (current-local-map))
 571   (use-local-map terminal-more-break-map)
 572   (make-local-variable 'te-more-old-filter)
 573   (setq te-more-old-filter (process-filter te-process))
 574   (make-local-variable 'te-more-old-mode-line-format)
 575   (setq te-more-old-mode-line-format mode-line-format
 576         mode-line-format (list "--   **MORE**  "
 577                                mode-line-buffer-identification
 578                                "%-"))
 579   (set-process-filter te-process
 580     (function (lambda (process string)
 581                 (save-excursion
 582                   (set-buffer (process-buffer process))
 583                   (setq te-pending-output (nconc te-pending-output
 584                                                  (list string))))
 585                   (te-update-pending-output-display))))
 586   (te-update-pending-output-display)
 587   (if (eq (window-buffer (selected-window)) (current-buffer))
 588       (message "More break "))
 589   (or (eobp)
 590       (null terminal-more-break-insertion)
 591       (save-excursion
 592         (forward-char 1)
 593         (delete-region (point) (+ (point) te-width))
 594         (insert terminal-more-break-insertion)))
 595   (run-hooks 'terminal-more-break-hook)
 596   (sit-for 0) ;get display to update
 597   (throw 'te-process-output t))
 598
 599 (defun te-more-break-unwind ()
 600   (use-local-map te-more-old-local-map)
 601   (set-process-filter te-process te-more-old-filter)
 602   (goto-char te-more-old-point)
 603   (setq mode-line-format te-more-old-mode-line-format)
 604   (force-mode-line-update)
 605   (let ((buffer-read-only nil))
 606     (cond ((eobp))
 607           (terminal-more-break-insertion
 608            (forward-char 1)
 609            (delete-region (point)
 610                           (+ (point) (length terminal-more-break-insertion)))
 611            (insert-char ?\  te-width)
 612            (goto-char te-more-old-point)))
 613     (setq te-more-old-point nil)
 614     (let ((te-more-count 259259))
 615       (te-newline)))
 616   ;(sit-for 0)
 617   (te-process-output t))
 618
 619 (defun te-set-more-count (newline)
 620   (let ((line (/ (- (point) (point-min)) (1+ te-width))))
 621     (if newline (setq line (1+ line)))
 622     (cond ((= line te-height)
 623            (setq te-more-count te-height))
 624           ;>>>> something is strange.  Investigate this!
 625           ((= line (1- te-height))
 626            (setq te-more-count te-height))
 627           ((or (< line (/ te-height 2))
 628                (> (- te-height line) 10))
 629            ;; break at end of this page
 630            (setq te-more-count (- te-height line)))
 631           (t
 632            ;; migrate back towards top (ie bottom) of screen.
 633            (setq te-more-count (- te-height
 634                                   (if (> te-height 10) 2 1)))))))
 635
 636 \f
 637 ;;;; More or less straight-forward terminal escapes
 638
 639 ;; ^j, meaning `newline' to non-display programs.
 640 ;; (Who would think of ever writing a system which doesn't understand
 641 ;;  display terminals natively?  Un*x:  The Operating System of the Future.)
 642 (defun te-newline ()
 643   "Move down a line, optionally do more processing, perhaps wrap/scroll,
 644 move to start of new line, clear to end of line."
 645   (end-of-line)
 646   (cond ((not terminal-more-processing))
 647         ((< (setq te-more-count (1- te-more-count)) 0)
 648          (te-set-more-count t))
 649         ((eql te-more-count 0)
 650          ;; this doesn't return
 651          (te-more-break)))
 652   (if (eobp)
 653       (progn
 654         (delete-region (point-min) (+ (point-min) te-width))
 655         (goto-char (point-min))
 656         (if terminal-scrolling
 657             (progn (delete-char 1)
 658                    (goto-char (point-max))
 659                    (insert ?\n))))
 660     (forward-char 1)
 661     (delete-region (point) (+ (point) te-width)))
 662   (insert-char ?\  te-width)
 663   (beginning-of-line)
 664   (te-set-window-start))
 665
 666 ; ^p = x+32 y+32
 667 (defun te-move-to-position ()
 668   ;; must offset by #o40 since cretinous unix won't send a 004 char through
 669   (let ((y (- (te-get-char) 32))
 670         (x (- (te-get-char) 32)))
 671     (if (or (> x te-width)
 672             (> y te-height))
 673         ()
 674       (goto-char (+ (point-min) x (* y (1+ te-width))))
 675       ;(te-set-window-start?)
 676       ))
 677   (setq te-more-count -1))
 678
 679
 680
 681 ;; ^p c
 682 (defun te-clear-rest-of-line ()
 683   (save-excursion
 684     (let ((n (- (point) (progn (end-of-line) (point)))))
 685       (delete-region (point) (+ (point) n))
 686       (insert-char ?\  (- n)))))
 687
 688
 689 ;; ^p C
 690 (defun te-clear-rest-of-screen ()
 691   (save-excursion
 692     (te-clear-rest-of-line)
 693     (while (progn (end-of-line) (not (eobp)))
 694       (forward-char 1) (end-of-line)
 695       (delete-region (- (point) te-width) (point))
 696       (insert-char ?\  te-width))))
 697
 698
 699 ;; ^p ^l
 700 (defun te-clear-screen ()
 701   ;; regenerate buffer to compensate for (nonexistent!!) bugs.
 702   (erase-buffer)
 703   (let ((i 0))
 704     (while (< i te-height)
 705       (setq i (1+ i))
 706       (insert-char ?\  te-width)
 707       (insert ?\n)))
 708   (delete-region (1- (point-max)) (point-max))
 709   (goto-char (point-min))
 710   (setq te-more-count -1))
 711
 712
 713 ;; ^p ^o count+32
 714 (defun te-insert-lines ()
 715   (if (not (bolp))
 716       ();(error "fooI")
 717     (save-excursion
 718       (let* ((line (- te-height (/ (- (point) (point-min)) (1+ te-width)) -1))
 719              (n (min (- (te-get-char) ?\ ) line))
 720              (i 0))
 721         (delete-region (- (point-max) (* n (1+ te-width))) (point-max))
 722         (if (eql (point) (point-max)) (insert ?\n))
 723         (while (< i n)
 724           (setq i (1+ i))
 725           (insert-char ?\  te-width)
 726           (or (eql i line) (insert ?\n))))))
 727   (setq te-more-count -1))
 728
 729
 730 ;; ^p ^k count+32
 731 (defun te-delete-lines ()
 732   (if (not (bolp))
 733       ();(error "fooD")
 734     (let* ((line (- te-height (/ (- (point) (point-min)) (1+ te-width)) -1))
 735            (n (min (- (te-get-char) ?\ ) line))
 736            (i 0))
 737       (delete-region (point)
 738                      (min (+ (point) (* n (1+ te-width))) (point-max)))
 739       (save-excursion
 740         (goto-char (point-max))
 741         (while (< i n)
 742           (setq i (1+ i))
 743           (insert-char ?\  te-width)
 744           (or (eql i line) (insert ?\n))))))
 745   (setq te-more-count -1))
 746
 747 ;; ^p ^a
 748 (defun te-beginning-of-line ()
 749   (beginning-of-line))
 750
 751 ;; ^p ^b
 752 (defun te-backward-char ()
 753   (if (not (bolp))
 754       (backward-char 1)))
 755
 756 ;; ^p ^f
 757 (defun te-forward-char ()
 758   (if (not (eolp))
 759       (forward-char 1)))
 760
 761 \f
 762 ;; 0177
 763 (defun te-delete ()
 764   (if (bolp)
 765       ()
 766     (delete-region (1- (point)) (point))
 767     (insert ?\ )
 768     (forward-char -1)))
 769
 770 ;; ^p ^g
 771 (defun te-beep ()
 772   (beep))
 773
 774
 775 ;; ^p _ count+32
 776 (defun te-insert-spaces ()
 777   (let* ((p (point))
 778          (n (min (- (te-get-char) 32)
 779                  (- (progn (end-of-line) (point)) p))))
 780     (if (<= n 0)
 781         nil
 782       (delete-char (- n))
 783       (goto-char p)
 784       (insert-char ?\  n))
 785     (goto-char p)))
 786
 787 ;; ^p d count+32  (should be ^p ^d but cretinous un*x won't send ^d chars!!!)
 788 (defun te-delete-char ()
 789   (let* ((p (point))
 790          (n (min (- (te-get-char) 32)
 791                  (- (progn (end-of-line) (point)) p))))
 792     (if (<= n 0)
 793         nil
 794       (insert-char ?\  n)
 795       (goto-char p)
 796       (delete-char n))
 797     (goto-char p)))
 798
 799
 800 \f
 801 ;; disgusting unix-required shit
 802 ;;  Are we living twenty years in the past yet?
 803
 804 (defun te-losing-unix ()
 805   nil)
 806
 807 ;; ^i
 808 (defun te-output-tab ()
 809   (let* ((p (point))
 810          (x (- p (progn (beginning-of-line) (point))))
 811          (l (min (- 8 (logand x 7))
 812                  (progn (end-of-line) (- (point) p)))))
 813     (goto-char (+ p l))))
 814
 815 ;; ^p ^j
 816 ;; Handle the `do' or `nl' termcap capability.
 817 ;;>> I am not sure why this broken, obsolete, capability is here.
 818 ;;>> Perhaps it is for VIle.  No comment was made about why it
 819 ;;>> was added (in "Sun Dec  6 01:22:27 1987  Richard Stallman")
 820 (defun te-down-vertically-or-scroll ()
 821   "Move down a line vertically, or scroll at bottom."
 822   (let ((column (current-column)))
 823     (end-of-line)
 824     (if (eobp)
 825         (progn
 826           (delete-region (point-min) (+ (point-min) te-width))
 827           (goto-char (point-min))
 828           (delete-char 1)
 829           (goto-char (point-max))
 830           (insert ?\n)
 831           (insert-char ?\  te-width)
 832           (beginning-of-line))
 833       (forward-line 1))
 834     (move-to-column column))
 835   (te-set-window-start))
 836
 837 ;; Also:
 838 ;;  ^m => beginning-of-line (for which it -should- be using ^p ^a, right?!!)
 839 ;;  ^g => te-beep (for which it should use ^p ^g)
 840 ;;  ^h => te-backward-char (for which it should use ^p ^b)
 841
 842 \f
 843
 844 (defun te-filter (process string)
 845   (let* ((obuf (current-buffer)))
 846     ;; can't use save-excursion, as that preserves point, which we don't want
 847     (unwind-protect
 848         (progn
 849           (set-buffer (process-buffer process))
 850           (goto-char te-saved-point)
 851           (and (bufferp te-log-buffer)
 852                (if (null (buffer-name te-log-buffer))
 853                    ;; killed
 854                    (setq te-log-buffer nil)
 855                  (set-buffer te-log-buffer)
 856                  (goto-char (point-max))
 857                  (insert-before-markers string)
 858                  (set-buffer (process-buffer process))))
 859           (setq te-pending-output (nconc te-pending-output (list string)))
 860           (te-update-pending-output-display)
 861           (te-process-output (eq (current-buffer)
 862                                  (window-buffer (selected-window))))
 863           (set-buffer (process-buffer process))
 864           (setq te-saved-point (point)))
 865       (set-buffer obuf))))
 866
 867 ;; (A version of the following comment which might be distractingly offensive
 868 ;; to some readers has been moved to term-nasty.el.)
 869 ;; unix lacks ITS-style tty control...
 870 (defun te-process-output (preemptible)
 871   ;;>> There seems no good reason to ever disallow preemption
 872   (setq preemptible t)
 873   (catch 'te-process-output
 874     (let ((buffer-read-only nil)
 875           (string nil) ostring start char (matchpos nil))
 876       (while (cdr te-pending-output)
 877         (setq ostring string
 878               start (car te-pending-output)
 879               string (car (cdr te-pending-output))
 880               char (aref string start))
 881         (if (eql (setq start (1+ start)) (length string))
 882             (progn (setq te-pending-output
 883                            (cons 0 (cdr (cdr te-pending-output)))
 884                          start 0
 885                          string (car (cdr te-pending-output)))
 886                    (te-update-pending-output-display))
 887             (setcar te-pending-output start))
 888         (if (and (> char ?\037) (< char ?\377))
 889             (cond ((eolp)
 890                    ;; unread char
 891                    (if (eql start 0)
 892                        (setq te-pending-output
 893                              (cons 0 (cons (make-string 1 char)
 894                                            (cdr te-pending-output))))
 895                        (setcar te-pending-output (1- start)))
 896                    (te-newline))
 897                   ((null string)
 898                    (delete-char 1) (insert char)
 899                    (te-redisplay-if-necessary 1))
 900                   (t
 901                    (let ((end (or (and (eq ostring string) matchpos)
 902                                   (setq matchpos (string-match
 903                                                    "[\000-\037\177-\377]"
 904                                                    string start))
 905                                   (length string))))
 906                      (delete-char 1) (insert char)
 907                      (setq char (point)) (end-of-line)
 908                      (setq end (min end (+ start (- (point) char))))
 909                      (goto-char char)
 910                      (if (eql end matchpos) (setq matchpos nil))
 911                      (delete-region (point) (+ (point) (- end start)))
 912                      (insert (if (and (eql start 0)
 913                                       (eql end (length string)))
 914                                  string
 915                                  (substring string start end)))
 916                      (if (eql end (length string))
 917                          (setq te-pending-output
 918                                (cons 0 (cdr (cdr te-pending-output))))
 919                          (setcar te-pending-output end))
 920                      (te-redisplay-if-necessary (1+ (- end start))))))
 921           ;; I suppose if I split the guts of this out into a separate
 922           ;;  function we could trivially emulate different terminals
 923           ;; Who cares in any case?  (Apart from stupid losers using rlogin)
 924           (funcall
 925             (if (eql char ?\^p)
 926                 (or (cdr (assq (te-get-char)
 927                                '((?= . te-move-to-position)
 928                                  (?c . te-clear-rest-of-line)
 929                                  (?C . te-clear-rest-of-screen)
 930                                  (?\C-o . te-insert-lines)
 931                                  (?\C-k . te-delete-lines)
 932                                  ;; not necessary, but help sometimes.
 933                                  (?\C-a . te-beginning-of-line)
 934                                  (?\C-b . te-backward-char)
 935                                  ;; should be C-d, but un*x
 936                                  ;;  pty's won't send \004 through!
 937                                  ;; Can you believe this?
 938                                  (?d . te-delete-char)
 939                                  (?_ . te-insert-spaces)
 940                                  ;; random
 941                                  (?\C-f . te-forward-char)
 942                                  (?\C-g . te-beep)
 943                                  (?\C-j . te-down-vertically-or-scroll)
 944                                  (?\C-l . te-clear-screen)
 945                                  )))
 946                     'te-losing-unix)
 947                 (or (cdr (assq char
 948                                '((?\C-j . te-newline)
 949                                  (?\177 . te-delete)
 950                                  ;; Did I ask to be sent these characters?
 951                                  ;; I don't remember doing so, either.
 952                                  ;; (Perhaps some operating system or
 953                                  ;; other is completely incompetent...)
 954                                  (?\C-m . te-beginning-of-line)
 955                                  (?\C-g . te-beep)
 956                                  (?\C-h . te-backward-char)
 957                                  (?\C-i . te-output-tab))))
 958                     'te-losing-unix)))
 959           (te-redisplay-if-necessary 1))
 960         (and preemptible
 961              (input-pending-p)
 962              ;; preemptible output!  Oh my!!
 963              (throw 'te-process-output t)))))
 964   ;; We must update window-point in every window displaying our buffer
 965   (let* ((s (selected-window))
 966          (w s))
 967     (while (not (eq s (setq w (next-window w))))
 968       (if (eq (window-buffer w) (current-buffer))
 969           (set-window-point w (point))))))
 970
 971 (defun te-get-char ()
 972   (if (cdr te-pending-output)
 973       (let ((start (car te-pending-output))
 974             (string (car (cdr te-pending-output))))
 975         (prog1 (aref string start)
 976           (if (eql (setq start (1+ start)) (length string))
 977               (setq te-pending-output (cons 0 (cdr (cdr te-pending-output))))
 978               (setcar te-pending-output start))))
 979     (catch 'char
 980       (let ((filter (process-filter te-process)))
 981         (unwind-protect
 982             (progn
 983               (set-process-filter te-process
 984                                   (function (lambda (p s)
 985                                     (or (eql (length s) 1)
 986                                         (setq te-pending-output (list 1 s)))
 987                                     (throw 'char (aref s 0)))))
 988               (accept-process-output te-process))
 989           (set-process-filter te-process filter))))))
 990
 991
 992 (defun te-redisplay-if-necessary (length)
 993   (and (<= (setq te-redisplay-count (- te-redisplay-count length)) 0)
 994        (eq (current-buffer) (window-buffer (selected-window)))
 995        (waiting-for-user-input-p)
 996        (progn (te-update-pending-output-display)
 997               (sit-for 0)
 998               (setq te-redisplay-count terminal-redisplay-interval))))
 999
1000 (defun te-update-pending-output-display ()
1001   (if (null (cdr te-pending-output))
1002       (setq te-pending-output-info "")
1003     (let ((length (te-pending-output-length)))
1004       (if (< length 1500)
1005           (setq te-pending-output-info "")
1006         (setq te-pending-output-info (format "(%dK chars output pending) "
1007                                              (/ (+ length 512) 1024))))))
1008   (force-mode-line-update))
1009
1010 \f
1011 (defun te-sentinel (process message)
1012   (cond ((eq (process-status process) 'run))
1013         ((null (buffer-name (process-buffer process)))) ;deleted
1014         (t (let ((b (current-buffer)))
1015              (save-excursion
1016                (set-buffer (process-buffer process))
1017                (setq buffer-read-only nil)
1018                (fundamental-mode)
1019                (goto-char (point-max))
1020                (delete-blank-lines)
1021                (delete-horizontal-space)
1022                (insert "\n*******\n" message "*******\n"))
1023              (if (and (eq b (process-buffer process))
1024                       (waiting-for-user-input-p))
1025                  (progn (goto-char (point-max))
1026                         (recenter -1)))))))
1027 \f
1028 (defvar te-stty-string "stty -nl erase '^?' kill '^u' intr '^c' echo pass8"
1029   "Shell command to set terminal modes for terminal emulator.")
1030 ;; This used to have `new' in it, but that loses outside BSD
1031 ;; and it's apparently not needed in BSD.
1032
1033 (defvar explicit-shell-file-name nil
1034   "*If non-nil, is file name to use for explicitly requested inferior shell.")
1035
1036 ;;;###autoload
1037 (defun terminal-emulator (buffer program args &optional width height)
1038   "Under a display-terminal emulator in BUFFER, run PROGRAM on arguments ARGS.
1039 ARGS is a list of argument-strings.  Remaining arguments are WIDTH and HEIGHT.
1040 BUFFER's contents are made an image of the display generated by that program,
1041 and any input typed when BUFFER is the current Emacs buffer is sent to that
1042 program an keyboard input.
1043
1044 Interactively, BUFFER defaults to \"*terminal*\" and PROGRAM and ARGS
1045 are parsed from an input-string using your usual shell.
1046 WIDTH and HEIGHT are determined from the size of the current window
1047 -- WIDTH will be one less than the window's width, HEIGHT will be its height.
1048
1049 To switch buffers and leave the emulator, or to give commands
1050 to the emulator itself (as opposed to the program running under it),
1051 type Control-^.  The following character is an emulator command.
1052 Type Control-^ twice to send it to the subprogram.
1053 This escape character may be changed using the variable `terminal-escape-char'.
1054
1055 `Meta' characters may not currently be sent through the terminal emulator.
1056
1057 Here is a list of some of the variables which control the behaviour
1058 of the emulator -- see their documentation for more information:
1059 terminal-escape-char, terminal-scrolling, terminal-more-processing,
1060 terminal-redisplay-interval.
1061
1062 This function calls the value of terminal-mode-hook if that exists
1063 and is non-nil after the terminal buffer has been set up and the
1064 subprocess started."
1065   (interactive
1066     (cons (save-excursion
1067             (set-buffer (get-buffer-create "*terminal*"))
1068             (buffer-name (if (or (not (boundp 'te-process))
1069                                  (null te-process)
1070                                  (not (eq (process-status te-process)
1071                                           'run)))
1072                              (current-buffer)
1073                            (generate-new-buffer "*terminal*"))))
1074           (append
1075             (let* ((default-s
1076                      ;; Default shell is same thing M-x shell uses.
1077                      (or explicit-shell-file-name
1078                          (getenv "ESHELL")
1079                          (getenv "SHELL")
1080                          "/bin/sh"))
1081                    (s (read-string
1082                        (format "Run program in emulator: (default %s) "
1083                                default-s))))
1084               (if (equal s "")
1085                   (list default-s '())
1086                 (te-parse-program-and-args s))))))
1087   (switch-to-buffer buffer)
1088   (if (null width) (setq width (- (window-width (selected-window)) 1)))
1089   (if (null height) (setq height (- (window-height (selected-window)) 1)))
1090   (terminal-mode)
1091   (setq te-width width te-height height)
1092   (setq te-terminal-name (concat te-terminal-name-prefix "-" te-width
1093                                  te-height))
1094   (setq mode-line-buffer-identification
1095         (list (format "Emacs terminal %dx%d: %%b  " te-width te-height)
1096               'te-pending-output-info))
1097   (let ((buffer-read-only nil))
1098     (te-clear-screen))
1099   (let (process)
1100     (while (setq process (get-buffer-process (current-buffer)))
1101       (if (y-or-n-p (format "Kill process %s? " (process-name process)))
1102           (delete-process process)
1103         (error "Process %s not killed" (process-name process)))))
1104   (condition-case err
1105       (let ((process-environment
1106              (cons (concat "TERM=" te-terminal-name)
1107                    (cons (concat "TERMCAP=" (te-create-termcap))
1108                          (cons (concat "TERMINFO=" (te-create-terminfo))
1109                                process-environment)))))
1110         (setq te-process
1111               (start-process "terminal-emulator" (current-buffer)
1112                              "/bin/sh" "-c"
1113                              ;; Yuck!!! Start a shell to set some terminal
1114                              ;; control characteristics.  Then start the
1115                              ;; "env" program to setup the terminal type
1116                              ;; Then finally start the program we wanted.
1117                              (format "%s; exec %s"
1118                                      te-stty-string
1119                                      (mapconcat 'te-quote-arg-for-sh
1120                                                 (cons program args) " "))))
1121         (set-process-filter te-process 'te-filter)
1122         (set-process-sentinel te-process 'te-sentinel))
1123     (error (fundamental-mode)
1124            (signal (car err) (cdr err))))
1125   (setq inhibit-quit t)                 ;sport death
1126   (use-local-map terminal-map)
1127   (run-hooks 'terminal-mode-hook)
1128   (message "Entering emacs terminal-emulator...  Type %s %s for help"
1129            (single-key-description terminal-escape-char)
1130            (mapconcat 'single-key-description
1131                       (where-is-internal 'te-escape-help terminal-escape-map t)
1132                       " ")))
1133
1134
1135 (defun te-parse-program-and-args (s)
1136   (cond ((string-match "\\`\\([-a-zA-Z0-9+=_.@/:]+[ \t]*\\)+\\'" s)
1137          (let ((l ()) (p 0))
1138            (while p
1139              (setq l (cons (if (string-match
1140                                 "\\([-a-zA-Z0-9+=_.@/:]+\\)\\([ \t]+\\)*"
1141                                 s p)
1142                                (prog1 (substring s p (match-end 1))
1143                                  (setq p (match-end 0))
1144                                  (if (eql p (length s)) (setq p nil)))
1145                                (prog1 (substring s p)
1146                                  (setq p nil)))
1147                            l)))
1148            (setq l (nreverse l))
1149            (list (car l) (cdr l))))
1150         ((and (string-match "[ \t]" s) (not (file-exists-p s)))
1151          (list shell-file-name (list "-c" (concat "exec " s))))
1152         (t (list s ()))))
1153
1154 (put 'terminal-mode 'mode-class 'special)
1155 ;; This is only separated out from function terminal-emulator
1156 ;; to keep the latter a little more manageable.
1157 (defun terminal-mode ()
1158   "Set up variables for use with the terminal-emulator.
1159 One should not call this -- it is an internal function
1160 of the terminal-emulator"
1161   (kill-all-local-variables)
1162   (buffer-disable-undo (current-buffer))
1163   (setq major-mode 'terminal-mode)
1164   (setq mode-name "terminal")
1165 ; (make-local-variable 'Helper-return-blurb)
1166 ; (setq Helper-return-blurb "return to terminal simulator")
1167   (setq mode-line-process '(":%s"))
1168   (setq buffer-read-only t)
1169   (setq truncate-lines t)
1170   (make-local-variable 'terminal-escape-char)
1171   (setq terminal-escape-char (default-value 'terminal-escape-char))
1172   (make-local-variable 'terminal-scrolling)
1173   (setq terminal-scrolling (default-value 'terminal-scrolling))
1174   (make-local-variable 'terminal-more-processing)
1175   (setq terminal-more-processing (default-value 'terminal-more-processing))
1176   (make-local-variable 'terminal-redisplay-interval)
1177   (setq terminal-redisplay-interval (default-value 'terminal-redisplay-interval))
1178   (make-local-variable 'te-width)
1179   (make-local-variable 'te-height)
1180   (make-local-variable 'te-process)
1181   (make-local-variable 'te-pending-output)
1182   (setq te-pending-output (list 0))
1183   (make-local-variable 'te-saved-point)
1184   (setq te-saved-point (point-min))
1185   (make-local-variable 'te-pending-output-info) ;for the mode line
1186   (setq te-pending-output-info "")
1187   (make-local-variable 'inhibit-quit)
1188   ;(setq inhibit-quit t)
1189   (make-local-variable 'te-log-buffer)
1190   (setq te-log-buffer nil)
1191   (make-local-variable 'te-more-count)
1192   (setq te-more-count -1)
1193   (make-local-variable 'te-redisplay-count)
1194   (setq te-redisplay-count terminal-redisplay-interval)
1195   ;(use-local-map terminal-mode-map)
1196   ;; terminal-mode-hook is called above in function terminal-emulator
1197   )
1198 \f
1199 ;;;; what a complete loss
1200
1201 (defun te-quote-arg-for-sh (string)
1202   (cond ((string-match "\\`[-a-zA-Z0-9+=_.@/:]+\\'"
1203                        string)
1204          string)
1205         ((not (string-match "[$]" string))
1206          ;; "[\"\\]" are special to sh and the lisp reader in the same way
1207          (prin1-to-string string))
1208         (t
1209          (let ((harder "")
1210                (start 0)
1211                (end 0))
1212            (while (cond ((>= start (length string))
1213                          nil)
1214                         ;; this is the set of chars magic with "..." in `sh'
1215                         ((setq end (string-match "[\"\\$]"
1216                                                  string start))
1217                          t)
1218                         (t (setq harder (concat harder
1219                                                 (substring string start)))
1220                            nil))
1221              (setq harder (concat harder (substring string start end)
1222                                   ;; Can't use ?\\ since `concat'
1223                                   ;; unfortunately does prin1-to-string
1224                                   ;; on fixna.  Amazing.
1225                                   "\\"
1226                                   (substring string
1227                                              end
1228                                              (1+ end)))
1229                    start (1+ end)))
1230            (concat "\"" harder "\"")))))
1231
1232 (defun te-create-terminfo ()
1233   "Create and compile a terminfo entry for the virtual terminal. This is kept
1234 in the /tmp directory"
1235   (if (and system-uses-terminfo
1236            (not (file-exists-p (concat  "/tmp/"
1237                                         (substring te-terminal-name-prefix 0 1)
1238                                         "/" te-terminal-name))))
1239     (let ( (terminfo
1240             (concat
1241              (format "%s,mir, xon,cols#%d, lines#%d,"
1242                      te-terminal-name te-width te-height)
1243              "bel=^P^G, clear=^P\\f, cr=^P^A, cub1=^P^B, cud1=^P\\n,"
1244              "cuf1=^P^F, cup=^P=%p1%'\\s'%+%c%p2%'\\s'%+%c,"
1245              "dch=^Pd%p1%'\\s'%+%c, dch1=^Pd!, dl=^P^K%p1%'\\s'%+%c,"
1246              "dl1=^P^K!, ed=^PC, el=^Pc, home=^P=\\s\\s,"
1247              "ich=^P_%p1%'\\s'%+%c, ich1=^P_!, il=^P^O%p1%'\\s'%+%c,"
1248              "il1=^P^O!, ind=^P\\n, nel=\\n,"))
1249            (file-name (concat "/tmp/" te-terminal-name ".tif")) )
1250       (save-excursion
1251         (set-buffer (create-file-buffer file-name))
1252         (insert terminfo)
1253         (write-file file-name)
1254         (kill-buffer nil)
1255         )
1256       (let ( (process-environment
1257               (cons (concat "TERMINFO=" "/tmp")
1258                     process-environment)) )
1259         (set-process-sentinel (start-process "tic" nil "tic" file-name)
1260                               'te-tic-sentinel))))
1261     "/tmp"
1262 )
1263
1264 (defun te-create-termcap ()
1265   "Create a termcap entry for the virtual terminal"
1266   ;; Because of Unix Brain Death(tm), we can't change
1267   ;;  the terminal type of a running process, and so
1268   ;;  terminal size and scrollability are wired-down
1269   ;;  at this point.  ("Detach?  What's that?")
1270   (concat (format "%s:co#%d:li#%d:%s"
1271                   ;; Sigh.  These can't be dynamically changed.
1272                   te-terminal-name te-width te-height (if terminal-scrolling
1273                                          "" "ns:"))
1274           ;;-- Basic things
1275           ;; cursor-motion, bol, forward/backward char
1276           "cm=^p=%+ %+ :cr=^p^a:le=^p^b:nd=^p^f:"
1277           ;; newline, clear eof/eof, audible bell
1278           "nw=^j:ce=^pc:cd=^pC:cl=^p^l:bl=^p^g:"
1279           ;; insert/delete char/line
1280           "IC=^p_%+ :DC=^pd%+ :AL=^p^o%+ :DL=^p^k%+ :"
1281           ;;-- Not-widely-known (ie nonstandard) flags, which mean
1282           ;; o writing in the last column of the last line
1283           ;;   doesn't cause idiotic scrolling, and
1284           ;; o don't use idiotische c-s/c-q sogenannte
1285           ;;   ``flow control'' auf keinen Fall.
1286           "LP:NF:"
1287           ;;-- For stupid or obsolete programs
1288           "ic=^p_!:dc=^pd!:al=^p^o!:dl=^p^k!:ho=^p=  :"
1289           ;;-- For disgusting programs.
1290           ;; (VI? What losers need these, I wonder?)
1291           "im=:ei=:dm=:ed=:mi:do=^p^j:nl=^p^j:bs:")
1292 )
1293
1294 (defun te-tic-sentinel (proc state-change)
1295   "If tic has finished, delete the .tif file"
1296   (if (equal state-change "finished
1297 ")
1298       (delete-file (concat "/tmp/" te-terminal-name ".tif"))))
1299
1300 (provide 'terminal)
1301
1302 ;;; terminal.el ends here