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