lisp/terminal.el

   1 ;;; terminal.el --- terminal emulator for GNU Emacs.
   2
   3 ;; Copyright (C) 1986, 1987, 1988, 1989 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-map nil)
  69 (if terminal-map
  70     nil
  71   (let ((map (make-keymap)))
  72     (fillarray (car (cdr map)) 'te-pass-through)
  73     ;(define-key map "\C-l"
  74     ;  '(lambda () (interactive) (te-pass-through) (redraw-display)))
  75     (setq terminal-map map)))
  76
  77 (defvar terminal-escape-map nil)
  78 (if terminal-escape-map
  79     nil
  80   (let ((map (make-keymap)))
  81     ;(fillarray map 'te-escape-extended-command-unread)
  82     (fillarray (car (cdr map)) 'undefined)
  83     (let ((s "0"))
  84       (while (<= (aref s 0) ?9)
  85         (define-key map s 'digit-argument)
  86         (aset s 0 (1+ (aref s 0)))))
  87     (define-key map "b" 'switch-to-buffer)
  88     (define-key map "o" 'other-window)
  89     (define-key map "e" 'te-set-escape-char)
  90     (define-key map "\C-l" 'redraw-display)
  91     (define-key map "\C-o" 'te-flush-pending-output)
  92     (define-key map "m" 'te-toggle-more-processing)
  93     (define-key map "x" 'te-escape-extended-command)
  94     ;;>> What use is this?  Why is it in the default terminal-emulator map?
  95     (define-key map "w" 'te-edit)
  96     (define-key map "?" 'te-escape-help)
  97     (define-key map (char-to-string help-char) 'te-escape-help)
  98     (setq terminal-escape-map map)))
  99
 100 (defvar te-escape-command-alist nil)
 101 (if te-escape-command-alist
 102     nil
 103   (setq te-escape-command-alist
 104         '(("Set Escape Character" . te-set-escape-char)
 105           ;;>> What use is this?  Why is it in the default terminal-emulator map?
 106           ("Edit" . te-edit)
 107           ("Refresh" . redraw-display)
 108           ("Record Output" . te-set-output-log)
 109           ("Photo" . te-set-output-log)
 110           ("Tofu" . te-tofu) ;; confuse the uninitiated
 111           ("Stuff Input" . te-stuff-string)
 112           ("Flush Pending Output" . te-flush-pending-output)
 113           ("Enable More Processing" . te-enable-more-processing)
 114           ("Disable More Processing" . te-disable-more-processing)
 115           ("Scroll at end of page" . te-do-scrolling)
 116           ("Wrap at end of page" . te-do-wrapping)
 117           ("Switch To Buffer" . switch-to-buffer)
 118           ("Other Window" . other-window)
 119           ("Kill Buffer" . kill-buffer)
 120           ("Help" . te-escape-help)
 121           ("Set Redisplay Interval" . te-set-redisplay-interval)
 122           )))
 123
 124 (defvar terminal-more-break-map nil)
 125 (if terminal-more-break-map
 126     nil
 127   (let ((map (make-keymap)))
 128     (fillarray (car (cdr map)) 'te-more-break-unread)
 129     (define-key map (char-to-string help-char) 'te-more-break-help)
 130     (define-key map " " 'te-more-break-resume)
 131     (define-key map "\C-l" 'redraw-display)
 132     (define-key map "\C-o" 'te-more-break-flush-pending-output)
 133     ;;>>> this isn't right
 134     ;(define-key map "\^?" 'te-more-break-flush-pending-output) ;DEL
 135     (define-key map "\r" 'te-more-break-advance-one-line)
 136
 137     (setq terminal-more-break-map map)))
 138
 139 \f
 140 ;;; Pacify the byte compiler
 141 (defvar te-process nil)
 142 (defvar te-log-buffer nil)
 143 (defvar te-height nil)
 144 (defvar te-width nil)
 145 (defvar te-more-count nil)
 146 (defvar te-redisplay-count nil)
 147 (defvar te-pending-output nil)
 148 (defvar te-saved-point)
 149 (defvar te-more-old-point nil)
 150 (defvar te-more-old-local-map nil)
 151 (defvar te-more-old-filter nil)
 152 (defvar te-more-old-mode-line-format nil)
 153 (defvar te-pending-output-info nil)
 154
 155 \f
 156 ;;;;  escape map
 157
 158 (defun te-escape ()
 159   (interactive)
 160   (let (s
 161         (local (current-local-map))
 162         (global (current-global-map)))
 163     (unwind-protect
 164         (progn
 165           (use-global-map terminal-escape-map)
 166           (use-local-map terminal-escape-map)
 167           (setq s (read-key-sequence
 168                     (if prefix-arg
 169                         (format "Emacs Terminal escape> %d "
 170                                 (prefix-numeric-value prefix-arg))
 171                         "Emacs Terminal escape> "))))
 172       (use-global-map global)
 173       (use-local-map local))
 174     (message "")
 175     (cond ((string= s (make-string 1 terminal-escape-char))
 176            (setq last-command-char terminal-escape-char)
 177            (let ((terminal-escape-char -259))
 178              (te-pass-through)))
 179           ((setq s (lookup-key terminal-escape-map s))
 180            (call-interactively s)))))
 181
 182 (defun te-escape-help ()
 183   "Provide help on commands available after terminal-escape-char is typed."
 184   (interactive)
 185   (message "Terminal emulator escape help...")
 186   (let ((char (single-key-description terminal-escape-char)))
 187     (with-electric-help
 188       (function (lambda ()
 189          (princ (format "Terminal-emulator escape, invoked by \"%s\"
 190 Type \"%s\" twice to send a single \"%s\" through.
 191
 192 Other chars following \"%s\" are interpreted as follows:\n"
 193                         char char char char))
 194
 195          (princ (substitute-command-keys "\\{terminal-escape-map}\n"))
 196          (princ (format "\nSubcommands of \"%s\" (%s)\n"
 197                         (where-is-internal 'te-escape-extended-command
 198                                            terminal-escape-map nil t)
 199                         'te-escape-extended-command))
 200          (let ((l (if (fboundp 'sortcar)
 201                       (sortcar (copy-sequence te-escape-command-alist)
 202                                'string<)
 203                       (sort (copy-sequence te-escape-command-alist)
 204                             (function (lambda (a b)
 205                               (string< (car a) (car b))))))))
 206            (while l
 207              (let ((doc (or (documentation (cdr (car l)))
 208                             "Not documented")))
 209                (if (string-match "\n" doc)
 210                    ;; just use first line of documentation
 211                    (setq doc (substring doc 0 (match-beginning 0))))
 212                (princ "  \"")
 213                (princ (car (car l)))
 214                (princ "\":\n     ")
 215                (princ doc)
 216                (write-char ?\n))
 217              (setq l (cdr l))))
 218          nil)))))
 219
 220
 221
 222 (defun te-escape-extended-command ()
 223   (interactive)
 224   (let ((c (let ((completion-ignore-case t))
 225              (completing-read "terminal command: "
 226                               te-escape-command-alist
 227                               nil t))))
 228     (if c
 229         (catch 'foo
 230           (setq c (downcase c))
 231           (let ((l te-escape-command-alist))
 232             (while l
 233               (if (string= c (downcase (car (car l))))
 234                   (throw 'foo (call-interactively (cdr (car l))))
 235                 (setq l (cdr l)))))))))
 236
 237 ;; not used.
 238 (defun te-escape-extended-command-unread ()
 239   (interactive)
 240   (setq unread-command-events (listify-key-sequence (this-command-keys)))
 241   (te-escape-extended-command))
 242
 243 (defun te-set-escape-char (c)
 244   "Change the terminal-emulator escape character."
 245   (interactive "cSet escape character to: ")
 246   (let ((o terminal-escape-char))
 247     (message (if (= o c)
 248                  "\"%s\" is the escape char"
 249                  "\"%s\" is now the escape; \"%s\" passes through")
 250              (single-key-description c)
 251              (single-key-description o))
 252     (setq terminal-escape-char c)))
 253
 254
 255 (defun te-stuff-string (string)
 256   "Read a string to send to through the terminal emulator
 257 as though that string had been typed on the keyboard.
 258
 259 Very poor man's file transfer protocol."
 260   (interactive "sStuff string: ")
 261   (process-send-string te-process string))
 262
 263 (defun te-set-output-log (name)
 264   "Record output from the terminal emulator in a buffer."
 265   (interactive (list (if te-log-buffer
 266                          nil
 267                        (read-buffer "Record output in buffer: "
 268                                     (format "%s output-log"
 269                                             (buffer-name (current-buffer)))
 270                                     nil))))
 271   (if (or (null name) (equal name ""))
 272       (progn (setq te-log-buffer nil)
 273              (message "Output logging off."))
 274     (if (get-buffer name)
 275         nil
 276       (save-excursion
 277         (set-buffer (get-buffer-create name))
 278         (fundamental-mode)
 279         (buffer-disable-undo (current-buffer))
 280         (erase-buffer)))
 281     (setq te-log-buffer (get-buffer name))
 282     (message "Recording terminal emulator output into buffer \"%s\""
 283              (buffer-name te-log-buffer))))
 284
 285 (defun te-tofu ()
 286   "Discontinue output log."
 287   (interactive)
 288   (te-set-output-log nil))
 289
 290
 291 (defun te-toggle (sym arg)
 292   (set sym (cond ((not (numberp arg)) arg)
 293                  ((= arg 1) (not (symbol-value sym)))
 294                  ((< arg 0) nil)
 295                  (t t))))
 296
 297 (defun te-toggle-more-processing (arg)
 298   (interactive "p")
 299   (message (if (te-toggle 'terminal-more-processing arg)
 300                "More processing on" "More processing off"))
 301   (if terminal-more-processing (setq te-more-count -1)))
 302
 303 (defun te-toggle-scrolling (arg)
 304   (interactive "p")
 305   (message (if (te-toggle 'terminal-scrolling arg)
 306                "Scroll at end of page" "Wrap at end of page")))
 307
 308 (defun te-enable-more-processing ()
 309   "Enable ** MORE ** processing"
 310   (interactive)
 311   (te-toggle-more-processing t))
 312
 313 (defun te-disable-more-processing ()
 314   "Disable ** MORE ** processing"
 315   (interactive)
 316   (te-toggle-more-processing nil))
 317
 318 (defun te-do-scrolling ()
 319   "Scroll at end of page (yuck)"
 320   (interactive)
 321   (te-toggle-scrolling t))
 322
 323 (defun te-do-wrapping ()
 324   "Wrap to top of window at end of page"
 325   (interactive)
 326   (te-toggle-scrolling nil))
 327
 328
 329 (defun te-set-redisplay-interval (arg)
 330   "Set the maximum interval (in output characters) between screen updates.
 331 Set this number to large value for greater throughput,
 332 set it smaller for more frequent updates (but overall slower performance."
 333   (interactive "NMax number of output chars between redisplay updates: ")
 334   (setq arg (max arg 1))
 335   (setq terminal-redisplay-interval arg
 336         te-redisplay-count 0))
 337 \f
 338 ;;;; more map
 339
 340 ;; every command -must- call te-more-break-unwind
 341 ;; or grave lossage will result
 342
 343 (put 'te-more-break-unread 'suppress-keymap t)
 344 (defun te-more-break-unread ()
 345   (interactive)
 346   (if (= last-input-char terminal-escape-char)
 347       (call-interactively 'te-escape)
 348     (message "Continuing from more break (\"%s\" typed, %d chars output pending...)"
 349              (single-key-description last-input-char)
 350              (te-pending-output-length))
 351     (setq te-more-count 259259)
 352     (te-more-break-unwind)
 353     (let ((terminal-more-processing nil))
 354       (te-pass-through))))
 355
 356 (defun te-more-break-resume ()
 357   "Proceed past the **MORE** break,
 358 allowing the next page of output to appear"
 359   (interactive)
 360   (message "Continuing from more break")
 361   (te-more-break-unwind))
 362
 363 (defun te-more-break-help ()
 364   "Provide help on commands available in a terminal-emulator **MORE** break"
 365   (interactive)
 366   (message "Terminal-emulator more break help...")
 367   (sit-for 0)
 368   (with-electric-help
 369     (function (lambda ()
 370       (princ "Terminal-emulator more break.\n\n")
 371       (princ (format "Type \"%s\" (te-more-break-resume)\n%s\n"
 372                      (where-is-internal 'te-more-break-resume
 373                                         terminal-more-break-map nil t)
 374                      (documentation 'te-more-break-resume)))
 375       (princ (substitute-command-keys "\\{terminal-more-break-map}\n"))
 376       (princ "Any other key is passed through to the program
 377 running under the terminal emulator and disables more processing until
 378 all pending output has been dealt with.")
 379       nil))))
 380
 381
 382 (defun te-more-break-advance-one-line ()
 383   "Allow one more line of text to be output before doing another more break."
 384   (interactive)
 385   (setq te-more-count 1)
 386   (te-more-break-unwind))
 387
 388 (defun te-more-break-flush-pending-output ()
 389   "Discard any output which has been received by the terminal emulator but
 390 not yet proceesed and then proceed from the more break."
 391   (interactive)
 392   (te-more-break-unwind)
 393   (te-flush-pending-output))
 394
 395 (defun te-flush-pending-output ()
 396   "Discard any as-yet-unprocessed output which has been received by
 397 the terminal emulator."
 398   (interactive)
 399   ;; this could conceivably be confusing in the presence of
 400   ;; escape-sequences spanning process-output chunks
 401   (if (null (cdr te-pending-output))
 402       (message "(There is no output pending)")
 403     (let ((length (te-pending-output-length)))
 404       (message "Flushing %d chars of pending output" length)
 405       (setq te-pending-output
 406             (list 0 (format "\n*** %d chars of pending output flushed ***\n"
 407                             length)))
 408       (te-update-pending-output-display)
 409       (te-process-output nil)
 410       (sit-for 0))))
 411
 412 \f
 413 (defun te-pass-through ()
 414   "Character is passed to the program running under the terminal emulator.
 415 One characters is treated specially:
 416 the terminal escape character (normally C-^)
 417 lets you type a terminal emulator command."
 418   (interactive)
 419   (cond ((= last-input-char terminal-escape-char)
 420          (call-interactively 'te-escape))
 421         (t
 422          (and terminal-more-processing (null (cdr te-pending-output))
 423               (te-set-more-count nil))
 424          (send-string te-process (make-string 1 last-input-char))
 425          (te-process-output t))))
 426
 427
 428 (defun te-set-window-start ()
 429   (let* ((w (get-buffer-window (current-buffer)))
 430          (h (if w (window-height w))))
 431     (cond ((not w)) ; buffer not displayed
 432           ((>= h (/ (- (point) (point-min)) (1+ te-width)))
 433            ;; this is the normal case
 434            (set-window-start w (point-min)))
 435           ;; this happens if some vandal shrinks our window.
 436           ((>= h (/ (- (point-max) (point)) (1+ te-width)))
 437            (set-window-start w (- (point-max) (* h (1+ te-width)) -1)))
 438           ;; I give up.
 439           (t nil))))
 440
 441 (defun te-pending-output-length ()
 442   (let ((length (car te-pending-output))
 443         (tem (cdr te-pending-output)))
 444     (while tem
 445       (setq length (+ length (length (car tem))) tem (cdr tem)))
 446     length))
 447 \f
 448 ;;>> What use is this terminal-edit stuff anyway?
 449 ;;>>  If nothing else, it was written by somebody who didn't
 450 ;;>>  competently understand the terminal-emulator...
 451
 452 (defvar terminal-edit-map nil)
 453 (if terminal-edit-map
 454     nil
 455   (setq terminal-edit-map (make-sparse-keymap))
 456   (define-key terminal-edit-map "\C-c\C-c" 'terminal-cease-edit))
 457
 458 ;; Terminal Edit mode is suitable only for specially formatted data.
 459 (put 'terminal-edit-mode 'mode-class 'special)
 460
 461 (defun terminal-edit-mode ()
 462   "Major mode for editing the contents of a terminal-emulator buffer.
 463 The editing commands are the same as in Fundamental mode,
 464 together with a command \\<terminal-edit-mode-map>to return to terminal emulation: \\[terminal-cease-edit]."
 465   (use-local-map terminal-edit-map)
 466   (setq major-mode 'terminal-edit-mode)
 467   (setq mode-name "Terminal Edit")
 468   (setq mode-line-modified (default-value 'mode-line-modified))
 469   (setq mode-line-process nil)
 470   (run-hooks 'terminal-edit-mode-hook))
 471
 472 (defun te-edit ()
 473   "Start editing the terminal emulator buffer with ordinary Emacs commands."
 474   (interactive)
 475   (terminal-edit-mode)
 476   (set-buffer-modified-p (buffer-modified-p))
 477   ;; Make mode line update.
 478   (if (eq (key-binding "\C-c\C-c") 'terminal-cease-edit)
 479       (message "Editing: Type C-c C-c to return to Terminal")
 480     (message (substitute-command-keys
 481                "Editing: Type \\[terminal-cease-edit] to return to Terminal"))))
 482
 483 (defun terminal-cease-edit ()
 484   "Finish editing message; switch back to Terminal proper."
 485   (interactive)
 486
 487   ;;>> emulator will blow out if buffer isn't exactly te-width x te-height
 488   (let ((buffer-read-only nil))
 489     (widen)
 490     (let ((opoint (point-marker))
 491           (width te-width)
 492           (h (1- te-height)))
 493       (goto-char (point-min))
 494       (while (>= h 0)
 495         (let ((p (point)))
 496           (cond ((search-forward "\n" (+ p width) 'move)
 497                  (forward-char -1)
 498                  (insert-char ?\  (- width (- (point) p)))
 499                  (forward-char 1))
 500                 ((eobp)
 501                  (insert-char ?\  (- width (- (point) p))))
 502                 ((= (following-char) ?\n)
 503                  (forward-char 1))
 504                 (t
 505                  (setq p (point))
 506                  (if (search-forward "\n" nil t)
 507                      (delete-region p (1- (point)))
 508                      (delete-region p (point-max))))))
 509         (if (= h 0)
 510             (if (not (eobp)) (delete-region (point) (point-max)))
 511             (if (eobp) (insert ?\n)))
 512         (setq h (1- h)))
 513       (goto-char opoint)
 514       (set-marker opoint nil nil)
 515       (setq te-saved-point (point))
 516       (setq te-redisplay-count 0)
 517       (setq te-more-count -1)))
 518
 519   (setq mode-line-modified (default-value 'mode-line-modified))
 520   (setq major-mode 'terminal-mode)
 521   (setq mode-name "terminal")
 522   (setq mode-line-process '(": %s")))
 523 \f
 524 ;;;; more break hair
 525
 526 (defun te-more-break ()
 527   (te-set-more-count t)
 528   (make-local-variable 'te-more-old-point)
 529   (setq te-more-old-point (point))
 530   (make-local-variable 'te-more-old-local-map)
 531   (setq te-more-old-local-map (current-local-map))
 532   (use-local-map terminal-more-break-map)
 533   (make-local-variable 'te-more-old-filter)
 534   (setq te-more-old-filter (process-filter te-process))
 535   (make-local-variable 'te-more-old-mode-line-format)
 536   (setq te-more-old-mode-line-format mode-line-format
 537         mode-line-format (list "--   **MORE**  "
 538                                mode-line-buffer-identification
 539                                "%-"))
 540   (set-process-filter te-process
 541     (function (lambda (process string)
 542                 (save-excursion
 543                   (set-buffer (process-buffer process))
 544                   (setq te-pending-output (nconc te-pending-output
 545                                                  (list string))))
 546                   (te-update-pending-output-display))))
 547   (te-update-pending-output-display)
 548   (if (eq (window-buffer (selected-window)) (current-buffer))
 549       (message "More break "))
 550   (or (eobp)
 551       (null terminal-more-break-insertion)
 552       (save-excursion
 553         (forward-char 1)
 554         (delete-region (point) (+ (point) te-width))
 555         (insert terminal-more-break-insertion)))
 556   (run-hooks 'terminal-more-break-hook)
 557   (sit-for 0) ;get display to update
 558   (throw 'te-process-output t))
 559
 560 (defun te-more-break-unwind ()
 561   (use-local-map te-more-old-local-map)
 562   (set-process-filter te-process te-more-old-filter)
 563   (goto-char te-more-old-point)
 564   (setq mode-line-format te-more-old-mode-line-format)
 565   (set-buffer-modified-p (buffer-modified-p))
 566   (let ((buffer-read-only nil))
 567     (cond ((eobp))
 568           (terminal-more-break-insertion
 569            (forward-char 1)
 570            (delete-region (point)
 571                           (+ (point) (length terminal-more-break-insertion)))
 572            (insert-char ?\  te-width)
 573            (goto-char te-more-old-point)))
 574     (setq te-more-old-point nil)
 575     (let ((te-more-count 259259))
 576       (te-newline)))
 577   ;(sit-for 0)
 578   (te-process-output t))
 579
 580 (defun te-set-more-count (newline)
 581   (let ((line (/ (- (point) (point-min)) (1+ te-width))))
 582     (if newline (setq line (1+ line)))
 583     (cond ((= line te-height)
 584            (setq te-more-count te-height))
 585           ;>>>> something is strange.  Investigate this!
 586           ((= line (1- te-height))
 587            (setq te-more-count te-height))
 588           ((or (< line (/ te-height 2))
 589                (> (- te-height line) 10))
 590            ;; break at end of this page
 591            (setq te-more-count (- te-height line)))
 592           (t
 593            ;; migrate back towards top (ie bottom) of screen.
 594            (setq te-more-count (- te-height
 595                                   (if (> te-height 10) 2 1)))))))
 596
 597 \f
 598 ;;;; More or less straight-forward terminal escapes
 599
 600 ;; ^j, meaning `newline' to non-display programs.
 601 ;; (Who would think of ever writing a system which doesn't understand
 602 ;;  display terminals natively?  Un*x:  The Operating System of the Future.)
 603 (defun te-newline ()
 604   "Move down a line, optionally do more processing, perhaps wrap/scroll,
 605 move to start of new line, clear to end of line."
 606   (end-of-line)
 607   (cond ((not terminal-more-processing))
 608         ((< (setq te-more-count (1- te-more-count)) 0)
 609          (te-set-more-count t))
 610         ((eql te-more-count 0)
 611          ;; this doesn't return
 612          (te-more-break)))
 613   (if (eobp)
 614       (progn
 615         (delete-region (point-min) (+ (point-min) te-width))
 616         (goto-char (point-min))
 617         (if terminal-scrolling
 618             (progn (delete-char 1)
 619                    (goto-char (point-max))
 620                    (insert ?\n))))
 621     (forward-char 1)
 622     (delete-region (point) (+ (point) te-width)))
 623   (insert-char ?\  te-width)
 624   (beginning-of-line)
 625   (te-set-window-start))
 626
 627 ; ^p = x+32 y+32
 628 (defun te-move-to-position ()
 629   ;; must offset by #o40 since cretinous unix won't send a 004 char through
 630   (let ((y (- (te-get-char) 32))
 631         (x (- (te-get-char) 32)))
 632     (if (or (> x te-width)
 633             (> y te-height))
 634         ()
 635       (goto-char (+ (point-min) x (* y (1+ te-width))))
 636       ;(te-set-window-start?)
 637       ))
 638   (setq te-more-count -1))
 639
 640
 641
 642 ;; ^p c
 643 (defun te-clear-rest-of-line ()
 644   (save-excursion
 645     (let ((n (- (point) (progn (end-of-line) (point)))))
 646       (delete-region (point) (+ (point) n))
 647       (insert-char ?\  (- n)))))
 648
 649
 650 ;; ^p C
 651 (defun te-clear-rest-of-screen ()
 652   (save-excursion
 653     (te-clear-rest-of-line)
 654     (while (progn (end-of-line) (not (eobp)))
 655       (forward-char 1) (end-of-line)
 656       (delete-region (- (point) te-width) (point))
 657       (insert-char ?\  te-width))))
 658
 659
 660 ;; ^p ^l
 661 (defun te-clear-screen ()
 662   ;; regenerate buffer to compensate for (nonexistent!!) bugs.
 663   (erase-buffer)
 664   (let ((i 0))
 665     (while (< i te-height)
 666       (setq i (1+ i))
 667       (insert-char ?\  te-width)
 668       (insert ?\n)))
 669   (delete-region (1- (point-max)) (point-max))
 670   (goto-char (point-min))
 671   (setq te-more-count -1))
 672
 673
 674 ;; ^p ^o count+32
 675 (defun te-insert-lines ()
 676   (if (not (bolp))
 677       ();(error "fooI")
 678     (save-excursion
 679       (let* ((line (- te-height (/ (- (point) (point-min)) (1+ te-width)) -1))
 680              (n (min (- (te-get-char) ?\ ) line))
 681              (i 0))
 682         (delete-region (- (point-max) (* n (1+ te-width))) (point-max))
 683         (if (eql (point) (point-max)) (insert ?\n))
 684         (while (< i n)
 685           (setq i (1+ i))
 686           (insert-char ?\  te-width)
 687           (or (eql i line) (insert ?\n))))))
 688   (setq te-more-count -1))
 689
 690
 691 ;; ^p ^k count+32
 692 (defun te-delete-lines ()
 693   (if (not (bolp))
 694       ();(error "fooD")
 695     (let* ((line (- te-height (/ (- (point) (point-min)) (1+ te-width)) -1))
 696            (n (min (- (te-get-char) ?\ ) line))
 697            (i 0))
 698       (delete-region (point)
 699                      (min (+ (point) (* n (1+ te-width))) (point-max)))
 700       (save-excursion
 701         (goto-char (point-max))
 702         (while (< i n)
 703           (setq i (1+ i))
 704           (insert-char ?\  te-width)
 705           (or (eql i line) (insert ?\n))))))
 706   (setq te-more-count -1))
 707
 708 ;; ^p ^a
 709 (defun te-beginning-of-line ()
 710   (beginning-of-line))
 711
 712 ;; ^p ^b
 713 (defun te-backward-char ()
 714   (if (not (bolp))
 715       (backward-char 1)))
 716
 717 ;; ^p ^f
 718 (defun te-forward-char ()
 719   (if (not (eolp))
 720       (forward-char 1)))
 721
 722 \f
 723 ;; 0177
 724 (defun te-delete ()
 725   (if (bolp)
 726       ()
 727     (delete-region (1- (point)) (point))
 728     (insert ?\ )
 729     (forward-char -1)))
 730
 731 ;; ^p ^g
 732 (defun te-beep ()
 733   (beep))
 734
 735
 736 ;; ^p _ count+32
 737 (defun te-insert-spaces ()
 738   (let* ((p (point))
 739          (n (min (- (te-get-char) 32)
 740                  (- (progn (end-of-line) (point)) p))))
 741     (if (<= n 0)
 742         nil
 743       (delete-char (- n))
 744       (goto-char p)
 745       (insert-char ?\  n))
 746     (goto-char p)))
 747
 748 ;; ^p d count+32  (should be ^p ^d but cretinous un*x won't send ^d chars!!!)
 749 (defun te-delete-char ()
 750   (let* ((p (point))
 751          (n (min (- (te-get-char) 32)
 752                  (- (progn (end-of-line) (point)) p))))
 753     (if (<= n 0)
 754         nil
 755       (insert-char ?\  n)
 756       (goto-char p)
 757       (delete-char n))
 758     (goto-char p)))
 759
 760
 761 \f
 762 ;; disgusting unix-required shit
 763 ;;  Are we living twenty years in the past yet?
 764
 765 (defun te-losing-unix ()
 766   nil)
 767
 768 ;; ^i
 769 (defun te-output-tab ()
 770   (let* ((p (point))
 771          (x (- p (progn (beginning-of-line) (point))))
 772          (l (min (- 8 (logand x 7))
 773                  (progn (end-of-line) (- (point) p)))))
 774     (goto-char (+ p l))))
 775
 776 ;; ^p ^j
 777 ;; Handle the `do' or `nl' termcap capability.
 778 ;;>> I am not sure why this broken, obsolete, capability is here.
 779 ;;>> Perhaps it is for VIle.  No comment was made about why it
 780 ;;>> was added (in "Sun Dec  6 01:22:27 1987  Richard Stallman")
 781 (defun te-down-vertically-or-scroll ()
 782   "Move down a line vertically, or scroll at bottom."
 783   (let ((column (current-column)))
 784     (end-of-line)
 785     (if (eobp)
 786         (progn
 787           (delete-region (point-min) (+ (point-min) te-width))
 788           (goto-char (point-min))
 789           (delete-char 1)
 790           (goto-char (point-max))
 791           (insert ?\n)
 792           (insert-char ?\  te-width)
 793           (beginning-of-line))
 794       (forward-line 1))
 795     (move-to-column column))
 796   (te-set-window-start))
 797
 798 ;; Also:
 799 ;;  ^m => beginning-of-line (for which it -should- be using ^p ^a, right?!!)
 800 ;;  ^g => te-beep (for which it should use ^p ^g)
 801 ;;  ^h => te-backward-char (for which it should use ^p ^b)
 802
 803 \f
 804
 805 (defun te-filter (process string)
 806   (let* ((obuf (current-buffer))
 807          (m meta-flag))
 808     ;; can't use save-excursion, as that preserves point, which we don't want
 809     (unwind-protect
 810         (progn
 811           (set-buffer (process-buffer process))
 812           (goto-char te-saved-point)
 813           (and (bufferp te-log-buffer)
 814                (if (null (buffer-name te-log-buffer))
 815                    ;; killed
 816                    (setq te-log-buffer nil)
 817                  (set-buffer te-log-buffer)
 818                  (goto-char (point-max))
 819                  (insert-before-markers string)
 820                  (set-buffer (process-buffer process))))
 821           (setq te-pending-output (nconc te-pending-output (list string)))
 822           (te-update-pending-output-display)
 823           ;; this binding is needed because emacs looks at meta-flag when
 824           ;;  the keystroke is read from the keyboard, not when it is about
 825           ;;  to be fed into a keymap (or returned by read-char)
 826           ;; There still could be some screws, though.
 827           (let ((meta-flag m))
 828             (te-process-output (eq (current-buffer)
 829                                    (window-buffer (selected-window)))))
 830           (set-buffer (process-buffer process))
 831           (setq te-saved-point (point)))
 832       (set-buffer obuf))))
 833
 834 ;; (A version of the following comment which might be distractingly offensive
 835 ;; to some readers has been moved to term-nasty.el.)
 836 ;; unix lacks ITS-style tty control...
 837 (defun te-process-output (preemptable)
 838   ;;>> There seems no good reason to ever disallow preemption
 839   (setq preemptable t)
 840   (catch 'te-process-output
 841     (let ((buffer-read-only nil)
 842           (string nil) ostring start char (matchpos nil))
 843       (while (cdr te-pending-output)
 844         (setq ostring string
 845               start (car te-pending-output)
 846               string (car (cdr te-pending-output))
 847               char (aref string start))
 848         (if (eql (setq start (1+ start)) (length string))
 849             (progn (setq te-pending-output
 850                            (cons 0 (cdr (cdr te-pending-output)))
 851                          start 0
 852                          string (car (cdr te-pending-output)))
 853                    (te-update-pending-output-display))
 854             (setcar te-pending-output start))
 855         (if (and (> char ?\037) (< char ?\377))
 856             (cond ((eolp)
 857                    ;; unread char
 858                    (if (eql start 0)
 859                        (setq te-pending-output
 860                              (cons 0 (cons (make-string 1 char)
 861                                            (cdr te-pending-output))))
 862                        (setcar te-pending-output (1- start)))
 863                    (te-newline))
 864                   ((null string)
 865                    (delete-char 1) (insert char)
 866                    (te-redisplay-if-necessary 1))
 867                   (t
 868                    (let ((end (or (and (eq ostring string) matchpos)
 869                                   (setq matchpos (string-match
 870                                                    "[\000-\037\177-\377]"
 871                                                    string start))
 872                                   (length string))))
 873                      (delete-char 1) (insert char)
 874                      (setq char (point)) (end-of-line)
 875                      (setq end (min end (+ start (- (point) char))))
 876                      (goto-char char)
 877                      (if (eql end matchpos) (setq matchpos nil))
 878                      (delete-region (point) (+ (point) (- end start)))
 879                      (insert (if (and (eql start 0)
 880                                       (eql end (length string)))
 881                                  string
 882                                  (substring string start end)))
 883                      (if (eql end (length string))
 884                          (setq te-pending-output
 885                                (cons 0 (cdr (cdr te-pending-output))))
 886                          (setcar te-pending-output end))
 887                      (te-redisplay-if-necessary (1+ (- end start))))))
 888           ;; I suppose if I split the guts of this out into a separate
 889           ;;  function we could trivially emulate different terminals
 890           ;; Who cares in any case?  (Apart from stupid losers using rlogin)
 891           (funcall
 892             (if (eql char ?\^p)
 893                 (or (cdr (assq (te-get-char)
 894                                '((?= . te-move-to-position)
 895                                  (?c . te-clear-rest-of-line)
 896                                  (?C . te-clear-rest-of-screen)
 897                                  (?\C-o . te-insert-lines)
 898                                  (?\C-k . te-delete-lines)
 899                                  ;; not necessary, but help sometimes.
 900                                  (?\C-a . te-beginning-of-line)
 901                                  (?\C-b . te-backward-char)
 902                                  ;; should be C-d, but un*x
 903                                  ;;  pty's won't send \004 through!
 904                                  ;; Can you believe this?
 905                                  (?d . te-delete-char)
 906                                  (?_ . te-insert-spaces)
 907                                  ;; random
 908                                  (?\C-f . te-forward-char)
 909                                  (?\C-g . te-beep)
 910                                  (?\C-j . te-down-vertically-or-scroll)
 911                                  (?\C-l . te-clear-screen)
 912                                  )))
 913                     'te-losing-unix)
 914                 (or (cdr (assq char
 915                                '((?\C-j . te-newline)
 916                                  (?\177 . te-delete)
 917                                  ;; Did I ask to be sent these characters?
 918                                  ;; I don't remember doing so, either.
 919                                  ;; (Perhaps some operating system or
 920                                  ;; other is completely incompetent...)
 921                                  (?\C-m . te-beginning-of-line)
 922                                  (?\C-g . te-beep)
 923                                  (?\C-h . te-backward-char)
 924                                  (?\C-i . te-output-tab))))
 925                     'te-losing-unix)))
 926           (te-redisplay-if-necessary 1))
 927         (and preemptable
 928              (input-pending-p)
 929              ;; preemptable output!  Oh my!!
 930              (throw 'te-process-output t)))))
 931   ;; We must update window-point in every window displaying our buffer
 932   (let* ((s (selected-window))
 933          (w s))
 934     (while (not (eq s (setq w (next-window w))))
 935       (if (eq (window-buffer w) (current-buffer))
 936           (set-window-point w (point))))))
 937
 938 (defun te-get-char ()
 939   (if (cdr te-pending-output)
 940       (let ((start (car te-pending-output))
 941             (string (car (cdr te-pending-output))))
 942         (prog1 (aref string start)
 943           (if (eql (setq start (1+ start)) (length string))
 944               (setq te-pending-output (cons 0 (cdr (cdr te-pending-output))))
 945               (setcar te-pending-output start))))
 946     (catch 'char
 947       (let ((filter (process-filter te-process)))
 948         (unwind-protect
 949             (progn
 950               (set-process-filter te-process
 951                                   (function (lambda (p s)
 952                                     (or (eql (length s) 1)
 953                                         (setq te-pending-output (list 1 s)))
 954                                     (throw 'char (aref s 0)))))
 955               (accept-process-output te-process))
 956           (set-process-filter te-process filter))))))
 957
 958
 959 (defun te-redisplay-if-necessary (length)
 960   (and (<= (setq te-redisplay-count (- te-redisplay-count length)) 0)
 961        (eq (current-buffer) (window-buffer (selected-window)))
 962        (waiting-for-user-input-p)
 963        (progn (te-update-pending-output-display)
 964               (sit-for 0)
 965               (setq te-redisplay-count terminal-redisplay-interval))))
 966
 967 (defun te-update-pending-output-display ()
 968   (if (null (cdr te-pending-output))
 969       (setq te-pending-output-info "")
 970     (let ((length (te-pending-output-length)))
 971       (if (< length 1500)
 972           (setq te-pending-output-info "")
 973         (setq te-pending-output-info (format "(%dK chars output pending) "
 974                                              (/ (+ length 512) 1024))))))
 975   ;; update mode line
 976   (set-buffer-modified-p (buffer-modified-p)))
 977
 978 \f
 979 (defun te-sentinel (process message)
 980   (cond ((eq (process-status process) 'run))
 981         ((null (buffer-name (process-buffer process)))) ;deleted
 982         (t (let ((b (current-buffer)))
 983              (save-excursion
 984                (set-buffer (process-buffer process))
 985                (setq buffer-read-only nil)
 986                (fundamental-mode)
 987                (goto-char (point-max))
 988                (delete-blank-lines)
 989                (delete-horizontal-space)
 990                (insert "\n*******\n" message "*******\n"))
 991              (if (and (eq b (process-buffer process))
 992                       (waiting-for-user-input-p))
 993                  (progn (goto-char (point-max))
 994                         (recenter -1)))))))
 995 \f
 996 (defvar te-stty-string "stty -nl erase ^? kill ^u intr ^c echo"
 997   "Shell command to set terminal modes for terminal emulator.")
 998 ;; This used to have `new' in it, but that loses outside BSD
 999 ;; and it's apparently not needed in BSD.
1000
1001 (defvar explicit-shell-file-name nil
1002   "*If non-nil, is file name to use for explicitly requested inferior shell.")
1003
1004 ;;;###autoload
1005 (defun terminal-emulator (buffer program args &optional width height)
1006   "Under a display-terminal emulator in BUFFER, run PROGRAM on arguments ARGS.
1007 ARGS is a list of argument-strings.  Remaining arguments are WIDTH and HEIGHT.
1008 BUFFER's contents are made an image of the display generated by that program,
1009 and any input typed when BUFFER is the current Emacs buffer is sent to that
1010 program an keyboard input.
1011
1012 Interactively, BUFFER defaults to \"*terminal*\" and PROGRAM and ARGS
1013 are parsed from an input-string using your usual shell.
1014 WIDTH and HEIGHT are determined from the size of the current window
1015 -- WIDTH will be one less than the window's width, HEIGHT will be its height.
1016
1017 To switch buffers and leave the emulator, or to give commands
1018 to the emulator itself (as opposed to the program running under it),
1019 type Control-^.  The following character is an emulator command.
1020 Type Control-^ twice to send it to the subprogram.
1021 This escape character may be changed using the variable `terminal-escape-char'.
1022
1023 `Meta' characters may not currently be sent through the terminal emulator.
1024
1025 Here is a list of some of the variables which control the behaviour
1026 of the emulator -- see their documentation for more information:
1027 terminal-escape-char, terminal-scrolling, terminal-more-processing,
1028 terminal-redisplay-interval.
1029
1030 This function calls the value of terminal-mode-hook if that exists
1031 and is non-nil after the terminal buffer has been set up and the
1032 subprocess started.
1033
1034 Presently with `termcap' only; if somebody sends us code to make this
1035 work with `terminfo' we will try to use it."
1036   (interactive
1037     (cons (save-excursion
1038             (set-buffer (get-buffer-create "*terminal*"))
1039             (buffer-name (if (or (not (boundp 'te-process))
1040                                  (null te-process)
1041                                  (not (eq (process-status te-process)
1042                                           'run)))
1043                              (current-buffer)
1044                            (generate-new-buffer "*terminal*"))))
1045           (append
1046             (let* ((default-s
1047                      ;; Default shell is same thing M-x shell uses.
1048                      (or explicit-shell-file-name
1049                          (getenv "ESHELL")
1050                          (getenv "SHELL")
1051                          "/bin/sh"))
1052                    (s (read-string
1053                        (format "Run program in emulator: (default %s) "
1054                                default-s))))
1055               (if (equal s "")
1056                   (list default-s '())
1057                 (te-parse-program-and-args s))))))
1058   (switch-to-buffer buffer)
1059   (if (null width) (setq width (- (window-width (selected-window)) 1)))
1060   (if (null height) (setq height (- (window-height (selected-window)) 1)))
1061   (terminal-mode)
1062   (setq te-width width te-height height)
1063   (setq mode-line-buffer-identification
1064         (list (format "Emacs terminal %dx%d: %%b  " te-width te-height)
1065               'te-pending-output-info))
1066   (let ((buffer-read-only nil))
1067     (te-clear-screen))
1068   (let (process)
1069     (while (setq process (get-buffer-process (current-buffer)))
1070       (if (y-or-n-p (format "Kill process %s? " (process-name process)))
1071           (delete-process process)
1072         (error "Process %s not killed" (process-name process)))))
1073   (condition-case err
1074       (let ((termcap
1075              ;; Because of Unix Brain Death(tm), we can't change
1076              ;;  the terminal type of a running process, and so
1077              ;;  terminal size and scrollability are wired-down
1078              ;;  at this point.  ("Detach?  What's that?")
1079              (concat (format "emacs-virtual:co#%d:li#%d:%s"
1080                              ;; Sigh.  These can't be dynamically changed.
1081                              te-width te-height (if terminal-scrolling
1082                                                     "" "ns:"))
1083                      ;;-- Basic things
1084                      ;; cursor-motion, bol, forward/backward char
1085                      "cm=^p=%+ %+ :cr=^p^a:le=^p^b:nd=^p^f:"
1086                      ;; newline, clear eof/eof, audible bell
1087                      "nw=^j:ce=^pc:cd=^pC:cl=^p^l:bl=^p^g:"
1088                      ;; insert/delete char/line
1089                      "IC=^p_%+ :DC=^pd%+ :AL=^p^o%+ :DL=^p^k%+ :"
1090                      ;;-- Not-widely-known (ie nonstandard) flags, which mean
1091                      ;; o writing in the last column of the last line
1092                      ;;   doesn't cause idiotic scrolling, and
1093                      ;; o don't use idiotische c-s/c-q sogenannte
1094                      ;;   ``flow control'' auf keinen Fall.
1095                      "LP:NF:"
1096                      ;;-- For stupid or obsolete programs
1097                      "ic=^p_!:dc=^pd!:al=^p^o!:dl=^p^k!:ho=^p=  :"
1098                      ;;-- For disgusting programs.
1099                      ;; (VI? What losers need these, I wonder?)
1100                      "im=:ei=:dm=:ed=:mi:do=^p^j:nl=^p^j:bs:")))
1101         (let ((process-environment
1102                (cons "TERM=emacs-virtual"
1103                      (cons (concat "TERMCAP=" termcap)
1104                            process-environment))))
1105           (setq te-process
1106                 (start-process "terminal-emulator" (current-buffer)
1107                                "/bin/sh" "-c"
1108                                ;; Yuck!!! Start a shell to set some terminal
1109                                ;; control characteristics.  Then start the
1110                                ;; "env" program to setup the terminal type
1111                                ;; Then finally start the program we wanted.
1112                                (format "%s; exec %s"
1113                                        te-stty-string
1114                                        (mapconcat 'te-quote-arg-for-sh
1115                                                   (cons program args) " ")))))
1116         (set-process-filter te-process 'te-filter)
1117         (set-process-sentinel te-process 'te-sentinel))
1118     (error (fundamental-mode)
1119            (signal (car err) (cdr err))))
1120   ;; sigh
1121   (if (default-value 'meta-flag)
1122       (progn (message
1123  "Note:  Meta key disabled due to maybe-eventually-reparable braindamage")
1124              (sit-for 1)))
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
1132                                          terminal-escape-map
1133                                          nil t)
1134                       " ")))
1135
1136
1137 (defun te-parse-program-and-args (s)
1138   (cond ((string-match "\\`\\([a-zA-Z0-9-+=_.@/:]+[ \t]*\\)+\\'" s)
1139          (let ((l ()) (p 0))
1140            (while p
1141              (setq l (cons (if (string-match
1142                                 "\\([a-zA-Z0-9-+=_.@/:]+\\)\\([ \t]+\\)*"
1143                                 s p)
1144                                (prog1 (substring s p (match-end 1))
1145                                  (setq p (match-end 0))
1146                                  (if (eql p (length s)) (setq p nil)))
1147                                (prog1 (substring s p)
1148                                  (setq p nil)))
1149                            l)))
1150            (setq l (nreverse l))
1151            (list (car l) (cdr l))))
1152         ((and (string-match "[ \t]" s) (not (file-exists-p s)))
1153          (list shell-file-name (list "-c" (concat "exec " s))))
1154         (t (list s ()))))
1155
1156 (put 'terminal-mode 'mode-class 'special)
1157 ;; This is only separated out from function terminal-emulator
1158 ;; to keep the latter a little more managable.
1159 (defun terminal-mode ()
1160   "Set up variables for use f the terminal-emualtor.
1161 One should not call this -- it is an internal function
1162 of the terminal-emulator"
1163   (kill-all-local-variables)
1164   (buffer-disable-undo (current-buffer))
1165   (setq major-mode 'terminal-mode)
1166   (setq mode-name "terminal")
1167 ; (make-local-variable 'Helper-return-blurb)
1168 ; (setq Helper-return-blurb "return to terminal simulator")
1169   (setq mode-line-process '(": %s"))
1170   (setq buffer-read-only t)
1171   (setq truncate-lines t)
1172   (make-local-variable 'terminal-escape-char)
1173   (setq terminal-escape-char (default-value 'terminal-escape-char))
1174   (make-local-variable 'terminal-scrolling)
1175   (setq terminal-scrolling (default-value 'terminal-scrolling))
1176   (make-local-variable 'terminal-more-processing)
1177   (setq terminal-more-processing (default-value 'terminal-more-processing))
1178   (make-local-variable 'terminal-redisplay-interval)
1179   (setq terminal-redisplay-interval (default-value 'terminal-redisplay-interval))
1180   (make-local-variable 'te-width)
1181   (make-local-variable 'te-height)
1182   (make-local-variable 'te-process)
1183   (make-local-variable 'te-pending-output)
1184   (setq te-pending-output (list 0))
1185   (make-local-variable 'te-saved-point)
1186   (setq te-saved-point (point-min))
1187   (make-local-variable 'te-pending-output-info) ;for the mode line
1188   (setq te-pending-output-info "")
1189   (make-local-variable 'inhibit-quit)
1190   ;(setq inhibit-quit t)
1191   (make-local-variable 'te-log-buffer)
1192   (setq te-log-buffer nil)
1193   (make-local-variable 'te-more-count)
1194   (setq te-more-count -1)
1195   (make-local-variable 'te-redisplay-count)
1196   (setq te-redisplay-count terminal-redisplay-interval)
1197   ;;>> Nothing can be done about this without decruftifying
1198   ;;>>  emacs keymaps.
1199   (make-local-variable 'meta-flag) ;sigh
1200   (setq meta-flag nil)
1201   ;(use-local-map terminal-mode-map)
1202   ;; terminal-mode-hook is called above in function terminal-emulator
1203   )
1204 \f
1205 ;;;; what a complete loss
1206
1207 (defun te-quote-arg-for-sh (string)
1208   (cond ((string-match "\\`[a-zA-Z0-9-+=_.@/:]+\\'"
1209                        string)
1210          string)
1211         ((not (string-match "[$]" string))
1212          ;; "[\"\\]" are special to sh and the lisp reader in the same way
1213          (prin1-to-string string))
1214         (t
1215          (let ((harder "")
1216                (start 0)
1217                (end 0))
1218            (while (cond ((>= start (length string))
1219                          nil)
1220                         ;; this is the set of chars magic with "..." in `sh'
1221                         ((setq end (string-match "[\"\\$]"
1222                                                  string start))
1223                          t)
1224                         (t (setq harder (concat harder
1225                                                 (substring string start)))
1226                            nil))
1227              (setq harder (concat harder (substring string start end)
1228                                   ;; Can't use ?\\ since `concat'
1229                                   ;; unfortunately does prin1-to-string
1230                                   ;; on fixna.  Amazing.
1231                                   "\\"
1232                                   (substring string
1233                                              end
1234                                              (1+ end)))
1235                    start (1+ end)))
1236            (concat "\"" harder "\"")))))
1237
1238 (provide 'terminal)
1239
1240 ;;; terminal.el ends here