lisp/terminal.el

   1 ;;; terminal.el --- terminal emulator for GNU Emacs.
   2
   3 ;; Copyright (C) 1986,87,88,89,93,94 Free Software Foundation, Inc.
   4
   5 ;; Author: Richard Mlynarik <mly@eddie.mit.edu>
   6 ;; Maintainer: FSF
   7 ;; Keywords: comm, terminals
   8
   9 ;; This file is part of GNU Emacs.
  10
  11 ;; GNU Emacs is free software; you can redistribute it and/or modify
  12 ;; it under the terms of the GNU General Public License as published by
  13 ;; the Free Software Foundation; either version 2, or (at your option)
  14 ;; any later version.
  15
  16 ;; GNU Emacs is distributed in the hope that it will be useful,
  17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 ;; GNU General Public License for more details.
  20
  21 ;; You should have received a copy of the GNU General Public License
  22 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  23 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  24 ;; Boston, MA 02111-1307, USA.
  25
  26 ;;; Commentary:
  27
  28 ;;; This file has been censored by the Communications Decency Act.
  29 ;;; That law was passed under the guise of a ban on pornography, but
  30 ;;; it bans far more than that.  This file did not contain pornography,
  31 ;;; but it was censored nonetheless.
  32
  33 ;;; For information on US government censorship of the Internet, and
  34 ;;; what you can do to bring back freedom of the press, see the web
  35 ;;; site http://www.vtw.org/
  36
  37 ;;; Code:
  38
  39 ;;>>TODO
  40 ;;>> ** Nothing can be done about emacs' meta-lossage **
  41 ;;>>  (without redoing keymaps `sanely' -- ask Mly for details)
  42
  43 ;;>> One probably wants to do setenv MORE -c when running with
  44 ;;>>   more-processing enabled.
  45
  46 (require 'ehelp)
  47
  48 (defgroup terminal nil
  49   "Terminal emulator for Emacs."
  50   :group 'terminals)
  51
  52
  53 (defcustom terminal-escape-char ?\C-^
  54   "*All characters except for this are passed verbatim through the
  55 terminal-emulator.  This character acts as a prefix for commands
  56 to the emulator program itself.  Type this character twice to send
  57 it through the emulator.  Type ? after typing it for a list of
  58 possible commands.
  59 This variable is local to each terminal-emulator buffer."
  60   :type 'character
  61   :group 'terminal)
  62
  63 (defcustom terminal-scrolling t ;;>> Setting this to T sort-of defeats my whole aim in writing this package...
  64   "*If non-nil, the terminal-emulator will losingly `scroll' when output occurs
  65 past the bottom of the screen.  If nil, output will win and `wrap' to the top
  66 of the screen.
  67 This variable is local to each terminal-emulator buffer."
  68   :type 'boolean
  69   :group 'terminal)
  70
  71 (defcustom terminal-more-processing t
  72   "*If non-nil, do more-processing.
  73 This variable is local to each terminal-emulator buffer."
  74   :type 'boolean
  75   :group 'terminal)
  76
  77 ;; If you are the sort of loser who uses scrolling without more breaks
  78 ;; and expects to actually see anything, you should probably set this to
  79 ;; around 400
  80 (defcustom terminal-redisplay-interval 5000
  81   "*Maximum number of characters which will be processed by the
  82 terminal-emulator before a screen redisplay is forced.
  83 Set this to a large value for greater throughput,
  84 set it smaller for more frequent updates but overall slower
  85 performance."
  86   :type 'integer
  87   :group 'terminal)
  88
  89 (defvar terminal-more-break-insertion
  90   "*** More break -- Press space to continue ***")
  91
  92 (defvar terminal-meta-map nil)
  93 (if terminal-meta-map
  94     nil
  95   (let ((map (make-sparse-keymap)))
  96     (define-key map [t] 'te-pass-through)
  97     (setq terminal-meta-map map)))
  98
  99 (defvar terminal-map nil)
 100 (if terminal-map
 101     nil
 102   (let ((map (make-sparse-keymap)))
 103     (define-key map [t] 'te-pass-through)
 104     (define-key map [switch-frame] 'handle-switch-frame)
 105     (define-key map "\e" terminal-meta-map)
 106     ;(define-key map "\C-l"
 107     ;  '(lambda () (interactive) (te-pass-through) (redraw-display)))
 108     (setq terminal-map map)))
 109
 110 (defvar terminal-escape-map nil)
 111 (if terminal-escape-map
 112     nil
 113   (let ((map (make-sparse-keymap)))
 114     (define-key map [t] 'undefined)
 115     (let ((s "0"))
 116       (while (<= (aref s 0) ?9)
 117         (define-key map s 'digit-argument)
 118         (aset s 0 (1+ (aref s 0)))))
 119     (define-key map "b" 'switch-to-buffer)
 120     (define-key map "o" 'other-window)
 121     (define-key map "e" 'te-set-escape-char)
 122     (define-key map "\C-l" 'redraw-display)
 123     (define-key map "\C-o" 'te-flush-pending-output)
 124     (define-key map "m" 'te-toggle-more-processing)
 125     (define-key map "x" 'te-escape-extended-command)
 126     ;;>> What use is this?  Why is it in the default terminal-emulator map?
 127     (define-key map "w" 'te-edit)
 128     (define-key map "?" 'te-escape-help)
 129     (define-key map (char-to-string help-char) 'te-escape-help)
 130     (setq terminal-escape-map map)))
 131
 132 (defvar te-escape-command-alist nil)
 133 (if te-escape-command-alist
 134     nil
 135   (setq te-escape-command-alist
 136         '(("Set Escape Character" . te-set-escape-char)
 137           ;;>> What use is this?  Why is it in the default terminal-emulator map?
 138           ("Edit" . te-edit)
 139           ("Refresh" . redraw-display)
 140           ("Record Output" . te-set-output-log)
 141           ("Photo" . te-set-output-log)
 142           ("Tofu" . te-tofu) ;; confuse the uninitiated
 143           ("Stuff Input" . te-stuff-string)
 144           ("Flush Pending Output" . te-flush-pending-output)
 145           ("Enable More Processing" . te-enable-more-processing)
 146           ("Disable More Processing" . te-disable-more-processing)
 147           ("Scroll at end of page" . te-do-scrolling)
 148           ("Wrap at end of page" . te-do-wrapping)
 149           ("Switch To Buffer" . switch-to-buffer)
 150           ("Other Window" . other-window)
 151           ("Kill Buffer" . kill-buffer)
 152           ("Help" . te-escape-help)
 153           ("Set Redisplay Interval" . te-set-redisplay-interval)
 154           )))
 155
 156 (defvar terminal-more-break-map nil)
 157 (if terminal-more-break-map
 158     nil
 159   (let ((map (make-sparse-keymap)))
 160     (define-key map [t] 'te-more-break-unread)
 161     (define-key map (char-to-string help-char) 'te-more-break-help)
 162     (define-key map " " 'te-more-break-resume)
 163     (define-key map "\C-l" 'redraw-display)
 164     (define-key map "\C-o" 'te-more-break-flush-pending-output)
 165     ;;>>> this isn't right
 166     ;(define-key map "\^?" 'te-more-break-flush-pending-output) ;DEL
 167     (define-key map "\r" 'te-more-break-advance-one-line)
 168
 169     (setq terminal-more-break-map map)))
 170
 171 \f
 172 ;;; Pacify the byte compiler
 173 (defvar te-process nil)
 174 (defvar te-log-buffer nil)
 175 (defvar te-height nil)
 176 (defvar te-width nil)
 177 (defvar te-more-count nil)
 178 (defvar te-redisplay-count nil)
 179 (defvar te-pending-output nil)
 180 (defvar te-saved-point)
 181 (defvar te-more-old-point nil)
 182 (defvar te-more-old-local-map nil)
 183 (defvar te-more-old-filter nil)
 184 (defvar te-more-old-mode-line-format nil)
 185 (defvar te-pending-output-info nil)
 186
 187 ;; Required to support terminfo systems
 188 (defconst te-terminal-name-prefix "emacs-em"
 189   "Prefix used for terminal type names for Terminfo.")
 190 (defconst te-terminfo-directory "/tmp/emacs-terminfo/"
 191   "Directory used for run-time terminal definition files for Terminfo.")
 192 (defvar te-terminal-name nil)
 193 \f
 194 ;;;;  escape map
 195
 196 (defun te-escape ()
 197   (interactive)
 198   (let (s
 199         (local (current-local-map))
 200         (global (current-global-map)))
 201     (unwind-protect
 202         (progn
 203           (use-global-map terminal-escape-map)
 204           (use-local-map terminal-escape-map)
 205           (setq s (read-key-sequence
 206                     (if current-prefix-arg
 207                         (format "Emacs Terminal escape> %d "
 208                                 (prefix-numeric-value current-prefix-arg))
 209                         "Emacs Terminal escape> "))))
 210       (use-global-map global)
 211       (use-local-map local))
 212
 213     (message "")
 214
 215     (cond
 216      ;;  Certain keys give vector notation, like [escape] when
 217      ;;  you hit esc key...
 218      ((and (stringp s)
 219            (string= s (make-string 1 terminal-escape-char)))
 220       (setq last-command-char terminal-escape-char)
 221       (let ((terminal-escape-char -259))
 222         (te-pass-through)))
 223
 224      ((setq s (lookup-key terminal-escape-map s))
 225       (call-interactively s)))
 226
 227     ))
 228
 229
 230 (defun te-escape-help ()
 231   "Provide help on commands available after terminal-escape-char is typed."
 232   (interactive)
 233   (message "Terminal emulator escape help...")
 234   (let ((char (single-key-description terminal-escape-char)))
 235     (with-electric-help
 236       (function (lambda ()
 237          (princ (format "Terminal-emulator escape, invoked by \"%s\"
 238 Type \"%s\" twice to send a single \"%s\" through.
 239
 240 Other chars following \"%s\" are interpreted as follows:\n"
 241                         char char char char))
 242
 243          (princ (substitute-command-keys "\\{terminal-escape-map}\n"))
 244          (princ (format "\nSubcommands of \"%s\" (%s)\n"
 245                         (where-is-internal 'te-escape-extended-command
 246                                            terminal-escape-map t)
 247                         'te-escape-extended-command))
 248          (let ((l (if (fboundp 'sortcar)
 249                       (sortcar (copy-sequence te-escape-command-alist)
 250                                'string<)
 251                       (sort (copy-sequence te-escape-command-alist)
 252                             (function (lambda (a b)
 253                               (string< (car a) (car b))))))))
 254            (while l
 255              (let ((doc (or (documentation (cdr (car l)))
 256                             "Not documented")))
 257                (if (string-match "\n" doc)
 258                    ;; just use first line of documentation
 259                    (setq doc (substring doc 0 (match-beginning 0))))
 260                (princ "  \"")
 261                (princ (car (car l)))
 262                (princ "\":\n     ")
 263                (princ doc)
 264                (write-char ?\n))
 265              (setq l (cdr l))))
 266          nil)))))
 267
 268
 269
 270 (defun te-escape-extended-command ()
 271   (interactive)
 272   (let ((c (let ((completion-ignore-case t))
 273              (completing-read "terminal command: "
 274                               te-escape-command-alist
 275                               nil t))))
 276     (if c
 277         (catch 'foo
 278           (setq c (downcase c))
 279           (let ((l te-escape-command-alist))
 280             (while l
 281               (if (string= c (downcase (car (car l))))
 282                   (throw 'foo (call-interactively (cdr (car l))))
 283                 (setq l (cdr l)))))))))
 284
 285 ;; not used.
 286 (defun te-escape-extended-command-unread ()
 287   (interactive)
 288   (setq unread-command-events (listify-key-sequence (this-command-keys)))
 289   (te-escape-extended-command))
 290
 291 (defun te-set-escape-char (c)
 292   "Change the terminal-emulator escape character."
 293   (interactive "cSet escape character to: ")
 294   (let ((o terminal-escape-char))
 295     (message (if (= o c)
 296                  "\"%s\" is the escape char"
 297                  "\"%s\" is now the escape; \"%s\" passes through")
 298              (single-key-description c)
 299              (single-key-description o))
 300     (setq terminal-escape-char c)))
 301
 302
 303 (defun te-stuff-string (string)
 304   "Read a string to send to through the terminal emulator
 305 as though that string had been typed on the keyboard.
 306
 307 Very poor man's file transfer protocol."
 308   (interactive "sStuff string: ")
 309   (process-send-string te-process string))
 310
 311 (defun te-set-output-log (name)
 312   "Record output from the terminal emulator in a buffer."
 313   (interactive (list (if te-log-buffer
 314                          nil
 315                        (read-buffer "Record output in buffer: "
 316                                     (format "%s output-log"
 317                                             (buffer-name (current-buffer)))
 318                                     nil))))
 319   (if (or (null name) (equal name ""))
 320       (progn (setq te-log-buffer nil)
 321              (message "Output logging off."))
 322     (if (get-buffer name)
 323         nil
 324       (save-excursion
 325         (set-buffer (get-buffer-create name))
 326         (fundamental-mode)
 327         (buffer-disable-undo (current-buffer))
 328         (erase-buffer)))
 329     (setq te-log-buffer (get-buffer name))
 330     (message "Recording terminal emulator output into buffer \"%s\""
 331              (buffer-name te-log-buffer))))
 332
 333 (defun te-tofu ()
 334   "Discontinue output log."
 335   (interactive)
 336   (te-set-output-log nil))
 337
 338
 339 (defun te-toggle (sym arg)
 340   (set sym (cond ((not (numberp arg)) arg)
 341                  ((= arg 1) (not (symbol-value sym)))
 342                  ((< arg 0) nil)
 343                  (t t))))
 344
 345 (defun te-toggle-more-processing (arg)
 346   (interactive "p")
 347   (message (if (te-toggle 'terminal-more-processing arg)
 348                "More processing on" "More processing off"))
 349   (if terminal-more-processing (setq te-more-count -1)))
 350
 351 (defun te-toggle-scrolling (arg)
 352   (interactive "p")
 353   (message (if (te-toggle 'terminal-scrolling arg)
 354                "Scroll at end of page" "Wrap at end of page")))
 355
 356 (defun te-enable-more-processing ()
 357   "Enable ** MORE ** processing"
 358   (interactive)
 359   (te-toggle-more-processing t))
 360
 361 (defun te-disable-more-processing ()
 362   "Disable ** MORE ** processing"
 363   (interactive)
 364   (te-toggle-more-processing nil))
 365
 366 (defun te-do-scrolling ()
 367   "Scroll at end of page (yuck)"
 368   (interactive)
 369   (te-toggle-scrolling t))
 370
 371 (defun te-do-wrapping ()
 372   "Wrap to top of window at end of page"
 373   (interactive)
 374   (te-toggle-scrolling nil))
 375
 376
 377 (defun te-set-redisplay-interval (arg)
 378   "Set the maximum interval (in output characters) between screen updates.
 379 Set this number to large value for greater throughput,
 380 set it smaller for more frequent updates (but overall slower performance."
 381   (interactive "NMax number of output chars between redisplay updates: ")
 382   (setq arg (max arg 1))
 383   (setq terminal-redisplay-interval arg
 384         te-redisplay-count 0))
 385 \f
 386 ;;;; more map
 387
 388 ;; every command -must- call te-more-break-unwind
 389 ;; or grave lossage will result
 390
 391 (put 'te-more-break-unread 'suppress-keymap t)
 392 (defun te-more-break-unread ()
 393   (interactive)
 394   (if (eq last-input-char terminal-escape-char)
 395       (call-interactively 'te-escape)
 396     (message "Continuing from more break (\"%s\" typed, %d chars output pending...)"
 397              (single-key-description last-input-char)
 398              (te-pending-output-length))
 399     (setq te-more-count 259259)
 400     (te-more-break-unwind)
 401     (let ((terminal-more-processing nil))
 402       (te-pass-through))))
 403
 404 (defun te-more-break-resume ()
 405   "Proceed past the **MORE** break,
 406 allowing the next page of output to appear"
 407   (interactive)
 408   (message "Continuing from more break")
 409   (te-more-break-unwind))
 410
 411 (defun te-more-break-help ()
 412   "Provide help on commands available in a terminal-emulator **MORE** break"
 413   (interactive)
 414   (message "Terminal-emulator more break help...")
 415   (sit-for 0)
 416   (with-electric-help
 417     (function (lambda ()
 418       (princ "Terminal-emulator more break.\n\n")
 419       (princ (format "Type \"%s\" (te-more-break-resume)\n%s\n"
 420                      (where-is-internal 'te-more-break-resume
 421                                         terminal-more-break-map t)
 422                      (documentation 'te-more-break-resume)))
 423       (princ (substitute-command-keys "\\{terminal-more-break-map}\n"))
 424       (princ "Any other key is passed through to the program
 425 running under the terminal emulator and disables more processing until
 426 all pending output has been dealt with.")
 427       nil))))
 428
 429
 430 (defun te-more-break-advance-one-line ()
 431   "Allow one more line of text to be output before doing another more break."
 432   (interactive)
 433   (setq te-more-count 1)
 434   (te-more-break-unwind))
 435
 436 (defun te-more-break-flush-pending-output ()
 437   "Discard any output which has been received by the terminal emulator but
 438 not yet processed and then proceed from the more break."
 439   (interactive)
 440   (te-more-break-unwind)
 441   (te-flush-pending-output))
 442
 443 (defun te-flush-pending-output ()
 444   "Discard any as-yet-unprocessed output which has been received by
 445 the terminal emulator."
 446   (interactive)
 447   ;; this could conceivably be confusing in the presence of
 448   ;; escape-sequences spanning process-output chunks
 449   (if (null (cdr te-pending-output))
 450       (message "(There is no output pending)")
 451     (let ((length (te-pending-output-length)))
 452       (message "Flushing %d chars of pending output" length)
 453       (setq te-pending-output
 454             (list 0 (format "\n*** %d chars of pending output flushed ***\n"
 455                             length)))
 456       (te-update-pending-output-display)
 457       (te-process-output nil)
 458       (sit-for 0))))
 459
 460 \f
 461 (defun te-pass-through ()
 462   "Character is passed to the program running under the terminal emulator.
 463 One characters is treated specially:
 464 the terminal escape character (normally C-^)
 465 lets you type a terminal emulator command."
 466   (interactive)
 467   (cond ((eq last-input-char terminal-escape-char)
 468          (call-interactively 'te-escape))
 469         (t
 470          ;; Convert `return' to C-m, etc.
 471          (if (and (symbolp last-input-char)
 472                   (get last-input-char 'ascii-character))
 473              (setq last-input-char (get last-input-char 'ascii-character)))
 474          ;; Convert meta characters to 8-bit form for transmission.
 475          (if (and (integerp last-input-char)
 476                   (not (zerop (logand last-input-char ?\M-\^@))))
 477              (setq last-input-char (+ 128 (logand last-input-char 127))))
 478          ;; Now ignore all but actual characters.
 479          ;; (It ought to be possible to send through function
 480          ;; keys as character sequences if we add a description
 481          ;; to our termcap entry of what they should look like.)
 482          (if (integerp last-input-char)
 483              (progn
 484                (and terminal-more-processing (null (cdr te-pending-output))
 485                     (te-set-more-count nil))
 486                (send-string te-process (make-string 1 last-input-char))
 487                (te-process-output t))
 488            (message "Function key `%s' ignored"
 489                     (single-key-description last-input-char))))))
 490
 491
 492 (defun te-set-window-start ()
 493   (let* ((w (get-buffer-window (current-buffer)))
 494          (h (if w (window-height w))))
 495     (cond ((not w)) ; buffer not displayed
 496           ((>= h (/ (- (point) (point-min)) (1+ te-width)))
 497            ;; this is the normal case
 498            (set-window-start w (point-min)))
 499           ;; this happens if some vandal shrinks our window.
 500           ((>= h (/ (- (point-max) (point)) (1+ te-width)))
 501            (set-window-start w (- (point-max) (* h (1+ te-width)) -1)))
 502           ;; I give up.
 503           (t nil))))
 504
 505 (defun te-pending-output-length ()
 506   (let ((length (car te-pending-output))
 507         (tem (cdr te-pending-output)))
 508     (while tem
 509       (setq length (+ length (length (car tem))) tem (cdr tem)))
 510     length))
 511 \f
 512 ;;>> What use is this terminal-edit stuff anyway?
 513 ;;>>  If nothing else, it was written by somebody who didn't
 514 ;;>>  competently understand the terminal-emulator...
 515
 516 (defvar terminal-edit-map nil)
 517 (if terminal-edit-map
 518     nil
 519   (setq terminal-edit-map (make-sparse-keymap))
 520   (define-key terminal-edit-map "\C-c\C-c" 'terminal-cease-edit))
 521
 522 ;; Terminal Edit mode is suitable only for specially formatted data.
 523 (put 'terminal-edit-mode 'mode-class 'special)
 524
 525 (defun terminal-edit-mode ()
 526   "Major mode for editing the contents of a terminal-emulator buffer.
 527 The editing commands are the same as in Fundamental mode,
 528 together with a command \\<terminal-edit-map>to return to terminal emulation: \\[terminal-cease-edit]."
 529   (use-local-map terminal-edit-map)
 530   (setq major-mode 'terminal-edit-mode)
 531   (setq mode-name "Terminal Edit")
 532   (setq mode-line-modified (default-value 'mode-line-modified))
 533   (setq mode-line-process nil)
 534   (run-hooks 'terminal-edit-mode-hook))
 535
 536 (defun te-edit ()
 537   "Start editing the terminal emulator buffer with ordinary Emacs commands."
 538   (interactive)
 539   (terminal-edit-mode)
 540   (force-mode-line-update)
 541   ;; Make mode line update.
 542   (if (eq (key-binding "\C-c\C-c") 'terminal-cease-edit)
 543       (message "Editing: Type C-c C-c to return to Terminal")
 544     (message "%s"
 545              (substitute-command-keys
 546                "Editing: Type \\[terminal-cease-edit] to return to Terminal"))))
 547
 548 (defun terminal-cease-edit ()
 549   "Finish editing message; switch back to Terminal proper."
 550   (interactive)
 551
 552   ;;>> emulator will blow out if buffer isn't exactly te-width x te-height
 553   (let ((buffer-read-only nil))
 554     (widen)
 555     (let ((opoint (point-marker))
 556           (width te-width)
 557           (h (1- te-height)))
 558       (goto-char (point-min))
 559       (while (>= h 0)
 560         (let ((p (point)))
 561           (cond ((search-forward "\n" (+ p width) 'move)
 562                  (forward-char -1)
 563                  (insert-char ?\  (- width (- (point) p)))
 564                  (forward-char 1))
 565                 ((eobp)
 566                  (insert-char ?\  (- width (- (point) p))))
 567                 ((= (following-char) ?\n)
 568                  (forward-char 1))
 569                 (t
 570                  (setq p (point))
 571                  (if (search-forward "\n" nil t)
 572                      (delete-region p (1- (point)))
 573                      (delete-region p (point-max))))))
 574         (if (= h 0)
 575             (if (not (eobp)) (delete-region (point) (point-max)))
 576             (if (eobp) (insert ?\n)))
 577         (setq h (1- h)))
 578       (goto-char opoint)
 579       (set-marker opoint nil nil)
 580       (setq te-saved-point (point))
 581       (setq te-redisplay-count 0)
 582       (setq te-more-count -1)))
 583
 584   (setq mode-line-modified (default-value 'mode-line-modified))
 585   (use-local-map terminal-map)
 586   (setq major-mode 'terminal-mode)
 587   (setq mode-name "terminal")
 588   (setq mode-line-process '(":%s")))
 589 \f
 590 ;;;; more break hair
 591
 592 (defun te-more-break ()
 593   (te-set-more-count t)
 594   (make-local-variable 'te-more-old-point)
 595   (setq te-more-old-point (point))
 596   (make-local-variable 'te-more-old-local-map)
 597   (setq te-more-old-local-map (current-local-map))
 598   (use-local-map terminal-more-break-map)
 599   (make-local-variable 'te-more-old-filter)
 600   (setq te-more-old-filter (process-filter te-process))
 601   (make-local-variable 'te-more-old-mode-line-format)
 602   (setq te-more-old-mode-line-format mode-line-format
 603         mode-line-format (list "--   **MORE**  "
 604                                mode-line-buffer-identification
 605                                "%-"))
 606   (set-process-filter te-process
 607     (function (lambda (process string)
 608                 (save-excursion
 609                   (set-buffer (process-buffer process))
 610                   (setq te-pending-output (nconc te-pending-output
 611                                                  (list string))))
 612                   (te-update-pending-output-display))))
 613   (te-update-pending-output-display)
 614   (if (eq (window-buffer (selected-window)) (current-buffer))
 615       (message "More break "))
 616   (or (eobp)
 617       (null terminal-more-break-insertion)
 618       (save-excursion
 619         (forward-char 1)
 620         (delete-region (point) (+ (point) te-width))
 621         (insert terminal-more-break-insertion)))
 622   (run-hooks 'terminal-more-break-hook)
 623   (sit-for 0) ;get display to update
 624   (throw 'te-process-output t))
 625
 626 (defun te-more-break-unwind ()
 627   (use-local-map te-more-old-local-map)
 628   (set-process-filter te-process te-more-old-filter)
 629   (goto-char te-more-old-point)
 630   (setq mode-line-format te-more-old-mode-line-format)
 631   (force-mode-line-update)
 632   (let ((buffer-read-only nil))
 633     (cond ((eobp))
 634           (terminal-more-break-insertion
 635            (forward-char 1)
 636            (delete-region (point)
 637                           (+ (point) (length terminal-more-break-insertion)))
 638            (insert-char ?\  te-width)
 639            (goto-char te-more-old-point)))
 640     (setq te-more-old-point nil)
 641     (let ((te-more-count 259259))
 642       (te-newline)))
 643   ;(sit-for 0)
 644   (te-process-output t))
 645
 646 (defun te-set-more-count (newline)
 647   (let ((line (/ (- (point) (point-min)) (1+ te-width))))
 648     (if newline (setq line (1+ line)))
 649     (cond ((= line te-height)
 650            (setq te-more-count te-height))
 651           ;>>>> something is strange.  Investigate this!
 652           ((= line (1- te-height))
 653            (setq te-more-count te-height))
 654           ((or (< line (/ te-height 2))
 655                (> (- te-height line) 10))
 656            ;; break at end of this page
 657            (setq te-more-count (- te-height line)))
 658           (t
 659            ;; migrate back towards top (ie bottom) of screen.
 660            (setq te-more-count (- te-height
 661                                   (if (> te-height 10) 2 1)))))))
 662
 663 \f
 664 ;;;; More or less straight-forward terminal escapes
 665
 666 ;; ^j, meaning `newline' to non-display programs.
 667 ;; (Who would think of ever writing a system which doesn't understand
 668 ;;  display terminals natively?  Un*x:  The Operating System of the Future.)
 669 (defun te-newline ()
 670   "Move down a line, optionally do more processing, perhaps wrap/scroll,
 671 move to start of new line, clear to end of line."
 672   (end-of-line)
 673   (cond ((not terminal-more-processing))
 674         ((< (setq te-more-count (1- te-more-count)) 0)
 675          (te-set-more-count t))
 676         ((eql te-more-count 0)
 677          ;; this doesn't return
 678          (te-more-break)))
 679   (if (eobp)
 680       (progn
 681         (delete-region (point-min) (+ (point-min) te-width))
 682         (goto-char (point-min))
 683         (if terminal-scrolling
 684             (progn (delete-char 1)
 685                    (goto-char (point-max))
 686                    (insert ?\n))))
 687     (forward-char 1)
 688     (delete-region (point) (+ (point) te-width)))
 689   (insert-char ?\  te-width)
 690   (beginning-of-line)
 691   (te-set-window-start))
 692
 693 ; ^p = x+32 y+32
 694 (defun te-move-to-position ()
 695   ;; must offset by #o40 since cretinous unix won't send a 004 char through
 696   (let ((y (- (te-get-char) 32))
 697         (x (- (te-get-char) 32)))
 698     (if (or (> x te-width)
 699             (> y te-height))
 700         ()
 701       (goto-char (+ (point-min) x (* y (1+ te-width))))
 702       ;(te-set-window-start?)
 703       ))
 704   (setq te-more-count -1))
 705
 706
 707
 708 ;; ^p c
 709 (defun te-clear-rest-of-line ()
 710   (save-excursion
 711     (let ((n (- (point) (progn (end-of-line) (point)))))
 712       (delete-region (point) (+ (point) n))
 713       (insert-char ?\  (- n)))))
 714
 715
 716 ;; ^p C
 717 (defun te-clear-rest-of-screen ()
 718   (save-excursion
 719     (te-clear-rest-of-line)
 720     (while (progn (end-of-line) (not (eobp)))
 721       (forward-char 1) (end-of-line)
 722       (delete-region (- (point) te-width) (point))
 723       (insert-char ?\  te-width))))
 724
 725
 726 ;; ^p ^l
 727 (defun te-clear-screen ()
 728   ;; regenerate buffer to compensate for (nonexistent!!) bugs.
 729   (erase-buffer)
 730   (let ((i 0))
 731     (while (< i te-height)
 732       (setq i (1+ i))
 733       (insert-char ?\  te-width)
 734       (insert ?\n)))
 735   (delete-region (1- (point-max)) (point-max))
 736   (goto-char (point-min))
 737   (setq te-more-count -1))
 738
 739
 740 ;; ^p ^o count+32
 741 (defun te-insert-lines ()
 742   (if (not (bolp))
 743       ();(error "fooI")
 744     (save-excursion
 745       (let* ((line (- te-height (/ (- (point) (point-min)) (1+ te-width)) -1))
 746              (n (min (- (te-get-char) ?\ ) line))
 747              (i 0))
 748         (delete-region (- (point-max) (* n (1+ te-width))) (point-max))
 749         (if (eql (point) (point-max)) (insert ?\n))
 750         (while (< i n)
 751           (setq i (1+ i))
 752           (insert-char ?\  te-width)
 753           (or (eql i line) (insert ?\n))))))
 754   (setq te-more-count -1))
 755
 756
 757 ;; ^p ^k count+32
 758 (defun te-delete-lines ()
 759   (if (not (bolp))
 760       ();(error "fooD")
 761     (let* ((line (- te-height (/ (- (point) (point-min)) (1+ te-width)) -1))
 762            (n (min (- (te-get-char) ?\ ) line))
 763            (i 0))
 764       (delete-region (point)
 765                      (min (+ (point) (* n (1+ te-width))) (point-max)))
 766       (save-excursion
 767         (goto-char (point-max))
 768         (while (< i n)
 769           (setq i (1+ i))
 770           (insert-char ?\  te-width)
 771           (or (eql i line) (insert ?\n))))))
 772   (setq te-more-count -1))
 773
 774 ;; ^p ^a
 775 (defun te-beginning-of-line ()
 776   (beginning-of-line))
 777
 778 ;; ^p ^b
 779 (defun te-backward-char ()
 780   (if (not (bolp))
 781       (backward-char 1)))
 782
 783 ;; ^p ^f
 784 (defun te-forward-char ()
 785   (if (not (eolp))
 786       (forward-char 1)))
 787
 788 \f
 789 ;; 0177
 790 (defun te-delete ()
 791   (if (bolp)
 792       ()
 793     (delete-region (1- (point)) (point))
 794     (insert ?\ )
 795     (forward-char -1)))
 796
 797 ;; ^p ^g
 798 (defun te-beep ()
 799   (beep))
 800
 801
 802 ;; ^p _ count+32
 803 (defun te-insert-spaces ()
 804   (let* ((p (point))
 805          (n (min (- (te-get-char) 32)
 806                  (- (progn (end-of-line) (point)) p))))
 807     (if (<= n 0)
 808         nil
 809       (delete-char (- n))
 810       (goto-char p)
 811       (insert-char ?\  n))
 812     (goto-char p)))
 813
 814 ;; ^p d count+32  (should be ^p ^d but cretinous un*x won't send ^d chars!!!)
 815 (defun te-delete-char ()
 816   (let* ((p (point))
 817          (n (min (- (te-get-char) 32)
 818                  (- (progn (end-of-line) (point)) p))))
 819     (if (<= n 0)
 820         nil
 821       (insert-char ?\  n)
 822       (goto-char p)
 823       (delete-char n))
 824     (goto-char p)))
 825
 826
 827 \f
 828 ;; disgusting unix-required excrement
 829 ;;  Are we living twenty years in the past yet?
 830
 831 (defun te-losing-unix ()
 832   nil)
 833
 834 ;; ^i
 835 (defun te-output-tab ()
 836   (let* ((p (point))
 837          (x (- p (progn (beginning-of-line) (point))))
 838          (l (min (- 8 (logand x 7))
 839                  (progn (end-of-line) (- (point) p)))))
 840     (goto-char (+ p l))))
 841
 842 ;; ^p ^j
 843 ;; Handle the `do' or `nl' termcap capability.
 844 ;;>> I am not sure why this broken, obsolete, capability is here.
 845 ;;>> Perhaps it is for VIle.  No comment was made about why it
 846 ;;>> was added (in "Sun Dec  6 01:22:27 1987  Richard Stallman")
 847 (defun te-down-vertically-or-scroll ()
 848   "Move down a line vertically, or scroll at bottom."
 849   (let ((column (current-column)))
 850     (end-of-line)
 851     (if (eobp)
 852         (progn
 853           (delete-region (point-min) (+ (point-min) te-width))
 854           (goto-char (point-min))
 855           (delete-char 1)
 856           (goto-char (point-max))
 857           (insert ?\n)
 858           (insert-char ?\  te-width)
 859           (beginning-of-line))
 860       (forward-line 1))
 861     (move-to-column column))
 862   (te-set-window-start))
 863
 864 ;; Also:
 865 ;;  ^m => beginning-of-line (for which it -should- be using ^p ^a, right?!!)
 866 ;;  ^g => te-beep (for which it should use ^p ^g)
 867 ;;  ^h => te-backward-char (for which it should use ^p ^b)
 868
 869 \f
 870
 871 (defun te-filter (process string)
 872   (let* ((obuf (current-buffer)))
 873     ;; can't use save-excursion, as that preserves point, which we don't want
 874     (unwind-protect
 875         (progn
 876           (set-buffer (process-buffer process))
 877           (goto-char te-saved-point)
 878           (and (bufferp te-log-buffer)
 879                (if (null (buffer-name te-log-buffer))
 880                    ;; killed
 881                    (setq te-log-buffer nil)
 882                  (set-buffer te-log-buffer)
 883                  (goto-char (point-max))
 884                  (insert-before-markers string)
 885                  (set-buffer (process-buffer process))))
 886           (setq te-pending-output (nconc te-pending-output (list string)))
 887           (te-update-pending-output-display)
 888           (te-process-output (eq (current-buffer)
 889                                  (window-buffer (selected-window))))
 890           (set-buffer (process-buffer process))
 891           (setq te-saved-point (point)))
 892       (set-buffer obuf))))
 893
 894 ;; (A version of the following comment which might be distractingly offensive
 895 ;; to some readers has been moved to term-nasty.el.)
 896 ;; unix lacks ITS-style tty control...
 897 (defun te-process-output (preemptible)
 898   ;;>> There seems no good reason to ever disallow preemption
 899   (setq preemptible t)
 900   (catch 'te-process-output
 901     (let ((buffer-read-only nil)
 902           (string nil) ostring start char (matchpos nil))
 903       (while (cdr te-pending-output)
 904         (setq ostring string
 905               start (car te-pending-output)
 906               string (car (cdr te-pending-output))
 907               char (aref string start))
 908         (if (eql (setq start (1+ start)) (length string))
 909             (progn (setq te-pending-output
 910                            (cons 0 (cdr (cdr te-pending-output)))
 911                          start 0
 912                          string (car (cdr te-pending-output)))
 913                    (te-update-pending-output-display))
 914             (setcar te-pending-output start))
 915         (if (and (> char ?\037) (< char ?\377))
 916             (cond ((eolp)
 917                    ;; unread char
 918                    (if (eql start 0)
 919                        (setq te-pending-output
 920                              (cons 0 (cons (make-string 1 char)
 921                                            (cdr te-pending-output))))
 922                        (setcar te-pending-output (1- start)))
 923                    (te-newline))
 924                   ((null string)
 925                    (delete-char 1) (insert char)
 926                    (te-redisplay-if-necessary 1))
 927                   (t
 928                    (let ((end (or (and (eq ostring string) matchpos)
 929                                   (setq matchpos (string-match
 930                                                    "[\000-\037\177-\377]"
 931                                                    string start))
 932                                   (length string))))
 933                      (delete-char 1) (insert char)
 934                      (setq char (point)) (end-of-line)
 935                      (setq end (min end (+ start (- (point) char))))
 936                      (goto-char char)
 937                      (if (eql end matchpos) (setq matchpos nil))
 938                      (delete-region (point) (+ (point) (- end start)))
 939                      (insert (if (and (eql start 0)
 940                                       (eql end (length string)))
 941                                  string
 942                                  (substring string start end)))
 943                      (if (eql end (length string))
 944                          (setq te-pending-output
 945                                (cons 0 (cdr (cdr te-pending-output))))
 946                          (setcar te-pending-output end))
 947                      (te-redisplay-if-necessary (1+ (- end start))))))
 948           ;; I suppose if I split the guts of this out into a separate
 949           ;;  function we could trivially emulate different terminals
 950           ;; Who cares in any case?  (Apart from stupid losers using rlogin)
 951           (funcall
 952             (if (eql char ?\^p)
 953                 (or (cdr (assq (te-get-char)
 954                                '((?= . te-move-to-position)
 955                                  (?c . te-clear-rest-of-line)
 956                                  (?C . te-clear-rest-of-screen)
 957                                  (?\C-o . te-insert-lines)
 958                                  (?\C-k . te-delete-lines)
 959                                  ;; not necessary, but help sometimes.
 960                                  (?\C-a . te-beginning-of-line)
 961                                  (?\C-b . te-backward-char)
 962                                  ;; should be C-d, but un*x
 963                                  ;;  pty's won't send \004 through!
 964                                  ;; Can you believe this?
 965                                  (?d . te-delete-char)
 966                                  (?_ . te-insert-spaces)
 967                                  ;; random
 968                                  (?\C-f . te-forward-char)
 969                                  (?\C-g . te-beep)
 970                                  (?\C-j . te-down-vertically-or-scroll)
 971                                  (?\C-l . te-clear-screen)
 972                                  )))
 973                     'te-losing-unix)
 974                 (or (cdr (assq char
 975                                '((?\C-j . te-newline)
 976                                  (?\177 . te-delete)
 977                                  ;; Did I ask to be sent these characters?
 978                                  ;; I don't remember doing so, either.
 979                                  ;; (Perhaps some operating system or
 980                                  ;; other is completely incompetent...)
 981                                  (?\C-m . te-beginning-of-line)
 982                                  (?\C-g . te-beep)
 983                                  (?\C-h . te-backward-char)
 984                                  (?\C-i . te-output-tab))))
 985                     'te-losing-unix)))
 986           (te-redisplay-if-necessary 1))
 987         (and preemptible
 988              (input-pending-p)
 989              ;; preemptible output!  Oh my!!
 990              (throw 'te-process-output t)))))
 991   ;; We must update window-point in every window displaying our buffer
 992   (let* ((s (selected-window))
 993          (w s))
 994     (while (not (eq s (setq w (next-window w))))
 995       (if (eq (window-buffer w) (current-buffer))
 996           (set-window-point w (point))))))
 997
 998 (defun te-get-char ()
 999   (if (cdr te-pending-output)
1000       (let ((start (car te-pending-output))
1001             (string (car (cdr te-pending-output))))
1002         (prog1 (aref string start)
1003           (if (eql (setq start (1+ start)) (length string))
1004               (setq te-pending-output (cons 0 (cdr (cdr te-pending-output))))
1005               (setcar te-pending-output start))))
1006     (catch 'char
1007       (let ((filter (process-filter te-process)))
1008         (unwind-protect
1009             (progn
1010               (set-process-filter te-process
1011                                   (function (lambda (p s)
1012                                     (or (eql (length s) 1)
1013                                         (setq te-pending-output (list 1 s)))
1014                                     (throw 'char (aref s 0)))))
1015               (accept-process-output te-process))
1016           (set-process-filter te-process filter))))))
1017
1018
1019 (defun te-redisplay-if-necessary (length)
1020   (and (<= (setq te-redisplay-count (- te-redisplay-count length)) 0)
1021        (eq (current-buffer) (window-buffer (selected-window)))
1022        (waiting-for-user-input-p)
1023        (progn (te-update-pending-output-display)
1024               (sit-for 0)
1025               (setq te-redisplay-count terminal-redisplay-interval))))
1026
1027 (defun te-update-pending-output-display ()
1028   (if (null (cdr te-pending-output))
1029       (setq te-pending-output-info "")
1030     (let ((length (te-pending-output-length)))
1031       (if (< length 1500)
1032           (setq te-pending-output-info "")
1033         (setq te-pending-output-info (format "(%dK chars output pending) "
1034                                              (/ (+ length 512) 1024))))))
1035   (force-mode-line-update))
1036
1037 \f
1038 (defun te-sentinel (process message)
1039   (cond ((eq (process-status process) 'run))
1040         ((null (buffer-name (process-buffer process)))) ;deleted
1041         (t (let ((b (current-buffer)))
1042              (save-excursion
1043                (set-buffer (process-buffer process))
1044                (setq buffer-read-only nil)
1045                (fundamental-mode)
1046                (goto-char (point-max))
1047                (delete-blank-lines)
1048                (delete-horizontal-space)
1049                (insert "\n*******\n" message "*******\n"))
1050              (if (and (eq b (process-buffer process))
1051                       (waiting-for-user-input-p))
1052                  (progn (goto-char (point-max))
1053                         (recenter -1)))))))
1054 \f
1055 (defvar te-stty-string "stty -nl erase '^?' kill '^u' intr '^c' echo pass8"
1056   "Shell command to set terminal modes for terminal emulator.")
1057 ;; This used to have `new' in it, but that loses outside BSD
1058 ;; and it's apparently not needed in BSD.
1059
1060 (defcustom explicit-shell-file-name nil
1061   "*If non-nil, is file name to use for explicitly requested inferior shell."
1062   :type '(choice (const :tag "None" nil)
1063                  file)
1064   :group 'terminal)
1065
1066 ;;;###autoload
1067 (defun terminal-emulator (buffer program args &optional width height)
1068   "Under a display-terminal emulator in BUFFER, run PROGRAM on arguments ARGS.
1069 ARGS is a list of argument-strings.  Remaining arguments are WIDTH and HEIGHT.
1070 BUFFER's contents are made an image of the display generated by that program,
1071 and any input typed when BUFFER is the current Emacs buffer is sent to that
1072 program an keyboard input.
1073
1074 Interactively, BUFFER defaults to \"*terminal*\" and PROGRAM and ARGS
1075 are parsed from an input-string using your usual shell.
1076 WIDTH and HEIGHT are determined from the size of the current window
1077 -- WIDTH will be one less than the window's width, HEIGHT will be its height.
1078
1079 To switch buffers and leave the emulator, or to give commands
1080 to the emulator itself (as opposed to the program running under it),
1081 type Control-^.  The following character is an emulator command.
1082 Type Control-^ twice to send it to the subprogram.
1083 This escape character may be changed using the variable `terminal-escape-char'.
1084
1085 `Meta' characters may not currently be sent through the terminal emulator.
1086
1087 Here is a list of some of the variables which control the behaviour
1088 of the emulator -- see their documentation for more information:
1089 terminal-escape-char, terminal-scrolling, terminal-more-processing,
1090 terminal-redisplay-interval.
1091
1092 This function calls the value of terminal-mode-hook if that exists
1093 and is non-nil after the terminal buffer has been set up and the
1094 subprocess started."
1095   (interactive
1096     (cons (save-excursion
1097             (set-buffer (get-buffer-create "*terminal*"))
1098             (buffer-name (if (or (not (boundp 'te-process))
1099                                  (null te-process)
1100                                  (not (eq (process-status te-process)
1101                                           'run)))
1102                              (current-buffer)
1103                            (generate-new-buffer "*terminal*"))))
1104           (append
1105             (let* ((default-s
1106                      ;; Default shell is same thing M-x shell uses.
1107                      (or explicit-shell-file-name
1108                          (getenv "ESHELL")
1109                          (getenv "SHELL")
1110                          "/bin/sh"))
1111                    (s (read-string
1112                        (format "Run program in emulator: (default %s) "
1113                                default-s))))
1114               (if (equal s "")
1115                   (list default-s '())
1116                 (te-parse-program-and-args s))))))
1117   (switch-to-buffer buffer)
1118   (if (null width) (setq width (- (window-width (selected-window)) 1)))
1119   (if (null height) (setq height (- (window-height (selected-window)) 1)))
1120   (terminal-mode)
1121   (setq te-width width te-height height)
1122   (setq te-terminal-name (concat te-terminal-name-prefix te-width
1123                                  te-height))
1124   (setq mode-line-buffer-identification
1125         (list (format "Emacs terminal %dx%d: %%b  " te-width te-height)
1126               'te-pending-output-info))
1127   (let ((buffer-read-only nil))
1128     (te-clear-screen))
1129   (let (process)
1130     (while (setq process (get-buffer-process (current-buffer)))
1131       (if (y-or-n-p (format "Kill process %s? " (process-name process)))
1132           (delete-process process)
1133         (error "Process %s not killed" (process-name process)))))
1134   (condition-case err
1135       (let ((process-environment
1136              (cons (concat "TERM=" te-terminal-name)
1137                    (cons (concat "TERMCAP=" (te-create-termcap))
1138                          (cons (concat "TERMINFO=" (te-create-terminfo))
1139                                process-environment)))))
1140         (setq te-process
1141               (start-process "terminal-emulator" (current-buffer)
1142                              "/bin/sh" "-c"
1143                              ;; Yuck!!! Start a shell to set some terminal
1144                              ;; control characteristics.  Then start the
1145                              ;; "env" program to setup the terminal type
1146                              ;; Then finally start the program we wanted.
1147                              (format "%s; exec %s"
1148                                      te-stty-string
1149                                      (mapconcat 'te-quote-arg-for-sh
1150                                                 (cons program args) " "))))
1151         (set-process-filter te-process 'te-filter)
1152         (set-process-sentinel te-process 'te-sentinel))
1153     (error (fundamental-mode)
1154            (signal (car err) (cdr err))))
1155   (setq inhibit-quit t)                 ;sport death
1156   (use-local-map terminal-map)
1157   (run-hooks 'terminal-mode-hook)
1158   (message "Entering emacs terminal-emulator...  Type %s %s for help"
1159            (single-key-description terminal-escape-char)
1160            (mapconcat 'single-key-description
1161                       (where-is-internal 'te-escape-help terminal-escape-map t)
1162                       " ")))
1163
1164
1165 (defun te-parse-program-and-args (s)
1166   (cond ((string-match "\\`\\([-a-zA-Z0-9+=_.@/:]+[ \t]*\\)+\\'" s)
1167          (let ((l ()) (p 0))
1168            (while p
1169              (setq l (cons (if (string-match
1170                                 "\\([-a-zA-Z0-9+=_.@/:]+\\)\\([ \t]+\\)*"
1171                                 s p)
1172                                (prog1 (substring s p (match-end 1))
1173                                  (setq p (match-end 0))
1174                                  (if (eql p (length s)) (setq p nil)))
1175                                (prog1 (substring s p)
1176                                  (setq p nil)))
1177                            l)))
1178            (setq l (nreverse l))
1179            (list (car l) (cdr l))))
1180         ((and (string-match "[ \t]" s) (not (file-exists-p s)))
1181          (list shell-file-name (list "-c" (concat "exec " s))))
1182         (t (list s ()))))
1183
1184 (put 'terminal-mode 'mode-class 'special)
1185 ;; This is only separated out from function terminal-emulator
1186 ;; to keep the latter a little more manageable.
1187 (defun terminal-mode ()
1188   "Set up variables for use with the terminal-emulator.
1189 One should not call this -- it is an internal function
1190 of the terminal-emulator"
1191   (kill-all-local-variables)
1192   (buffer-disable-undo (current-buffer))
1193   (setq major-mode 'terminal-mode)
1194   (setq mode-name "terminal")
1195 ; (make-local-variable 'Helper-return-blurb)
1196 ; (setq Helper-return-blurb "return to terminal simulator")
1197   (setq mode-line-process '(":%s"))
1198   (setq buffer-read-only t)
1199   (setq truncate-lines t)
1200   (make-local-variable 'terminal-escape-char)
1201   (setq terminal-escape-char (default-value 'terminal-escape-char))
1202   (make-local-variable 'terminal-scrolling)
1203   (setq terminal-scrolling (default-value 'terminal-scrolling))
1204   (make-local-variable 'terminal-more-processing)
1205   (setq terminal-more-processing (default-value 'terminal-more-processing))
1206   (make-local-variable 'terminal-redisplay-interval)
1207   (setq terminal-redisplay-interval (default-value 'terminal-redisplay-interval))
1208   (make-local-variable 'te-width)
1209   (make-local-variable 'te-height)
1210   (make-local-variable 'te-process)
1211   (make-local-variable 'te-pending-output)
1212   (setq te-pending-output (list 0))
1213   (make-local-variable 'te-saved-point)
1214   (setq te-saved-point (point-min))
1215   (make-local-variable 'te-pending-output-info) ;for the mode line
1216   (setq te-pending-output-info "")
1217   (make-local-variable 'inhibit-quit)
1218   ;(setq inhibit-quit t)
1219   (make-local-variable 'te-log-buffer)
1220   (setq te-log-buffer nil)
1221   (make-local-variable 'te-more-count)
1222   (setq te-more-count -1)
1223   (make-local-variable 'te-redisplay-count)
1224   (setq te-redisplay-count terminal-redisplay-interval)
1225   ;(use-local-map terminal-mode-map)
1226   ;; terminal-mode-hook is called above in function terminal-emulator
1227   )
1228 \f
1229 ;;;; what a complete loss
1230
1231 (defun te-quote-arg-for-sh (string)
1232   (cond ((string-match "\\`[-a-zA-Z0-9+=_.@/:]+\\'"
1233                        string)
1234          string)
1235         ((not (string-match "[$]" string))
1236          ;; "[\"\\]" are special to sh and the lisp reader in the same way
1237          (prin1-to-string string))
1238         (t
1239          (let ((harder "")
1240                (start 0)
1241                (end 0))
1242            (while (cond ((>= start (length string))
1243                          nil)
1244                         ;; this is the set of chars magic with "..." in `sh'
1245                         ((setq end (string-match "[\"\\$]"
1246                                                  string start))
1247                          t)
1248                         (t (setq harder (concat harder
1249                                                 (substring string start)))
1250                            nil))
1251              (setq harder (concat harder (substring string start end)
1252                                   ;; Can't use ?\\ since `concat'
1253                                   ;; unfortunately does prin1-to-string
1254                                   ;; on fixna.  Amazing.
1255                                   "\\"
1256                                   (substring string
1257                                              end
1258                                              (1+ end)))
1259                    start (1+ end)))
1260            (concat "\"" harder "\"")))))
1261
1262 (defun te-create-terminfo ()
1263   "Create and compile a terminfo entry for the virtual terminal. This is kept
1264 in the directory specified by `te-terminfo-directory'."
1265   (if (and system-uses-terminfo
1266            (not (file-exists-p (concat  te-terminfo-directory
1267                                         (substring te-terminal-name-prefix 0 1)
1268                                         "/" te-terminal-name))))
1269     (let ( (terminfo
1270             (concat
1271              ;; The first newline avoids trouble with ncurses.
1272              (format "%s,\n\tmir, xon,cols#%d, lines#%d,"
1273                      te-terminal-name te-width te-height)
1274              "bel=^P^G, clear=^P\\f, cr=^P^A, cub1=^P^B, cud1=^P\\n,"
1275              "cuf1=^P^F, cup=^P=%p1%'\\s'%+%c%p2%'\\s'%+%c,"
1276              "dch=^Pd%p1%'\\s'%+%c, dch1=^Pd!, dl=^P^K%p1%'\\s'%+%c,"
1277              "dl1=^P^K!, ed=^PC, el=^Pc, home=^P=\\s\\s,"
1278              "ich=^P_%p1%'\\s'%+%c, ich1=^P_!, il=^P^O%p1%'\\s'%+%c,"
1279              "il1=^P^O!, ind=^P\\n, nel=\\n,\n"))
1280            ;; The last newline avoids trouble with ncurses.
1281            (file-name (concat te-terminfo-directory te-terminal-name ".tif")) )
1282       (make-directory te-terminfo-directory t)
1283       (save-excursion
1284         (set-buffer (create-file-buffer file-name))
1285         (insert terminfo)
1286         (write-file file-name)
1287         (kill-buffer nil)
1288         )
1289       (let ( (process-environment
1290               (cons (concat "TERMINFO="
1291                             (directory-file-name te-terminfo-directory))
1292                     process-environment)) )
1293         (set-process-sentinel (start-process "tic" nil "tic" file-name)
1294                               'te-tic-sentinel))))
1295     (directory-file-name te-terminfo-directory)
1296 )
1297
1298 (defun te-create-termcap ()
1299   "Create a termcap entry for the virtual terminal"
1300   ;; Because of Unix Brain Death(tm), we can't change
1301   ;;  the terminal type of a running process, and so
1302   ;;  terminal size and scrollability are wired-down
1303   ;;  at this point.  ("Detach?  What's that?")
1304   (concat (format "%s:co#%d:li#%d:%s"
1305                   ;; Sigh.  These can't be dynamically changed.
1306                   te-terminal-name te-width te-height (if terminal-scrolling
1307                                          "" "ns:"))
1308           ;;-- Basic things
1309           ;; cursor-motion, bol, forward/backward char
1310           "cm=^p=%+ %+ :cr=^p^a:le=^p^b:nd=^p^f:"
1311           ;; newline, clear eof/eof, audible bell
1312           "nw=^j:ce=^pc:cd=^pC:cl=^p^l:bl=^p^g:"
1313           ;; insert/delete char/line
1314           "IC=^p_%+ :DC=^pd%+ :AL=^p^o%+ :DL=^p^k%+ :"
1315           ;;-- Not-widely-known (ie nonstandard) flags, which mean
1316           ;; o writing in the last column of the last line
1317           ;;   doesn't cause idiotic scrolling, and
1318           ;; o don't use idiotische c-s/c-q sogenannte
1319           ;;   ``flow control'' auf keinen Fall.
1320           "LP:NF:"
1321           ;;-- For stupid or obsolete programs
1322           "ic=^p_!:dc=^pd!:al=^p^o!:dl=^p^k!:ho=^p=  :"
1323           ;;-- For disgusting programs.
1324           ;; (VI? What losers need these, I wonder?)
1325           "im=:ei=:dm=:ed=:mi:do=^p^j:nl=^p^j:bs:")
1326 )
1327
1328 (defun te-tic-sentinel (proc state-change)
1329   "If tic has finished, delete the .tif file"
1330   (if (equal state-change "finished
1331 ")
1332       (delete-file (concat te-terminfo-directory te-terminal-name ".tif"))))
1333
1334 (provide 'terminal)
1335
1336 ;;; terminal.el ends here