lisp/terminal.el

   1 ;;; terminal.el --- terminal emulator for GNU Emacs.
   2
   3 ;; Copyright (C) 1986,87,88,89,93,94 Free Software Foundation, Inc.
   4
   5 ;; Author: Richard Mlynarik <mly@eddie.mit.edu>
   6 ;; Maintainer: FSF
   7 ;; Keywords: comm, terminals
   8
   9 ;; This file is part of GNU Emacs.
  10
  11 ;; GNU Emacs is free software; you can redistribute it and/or modify
  12 ;; it under the terms of the GNU General Public License as published by
  13 ;; the Free Software Foundation; either version 2, or (at your option)
  14 ;; any later version.
  15
  16 ;; GNU Emacs is distributed in the hope that it will be useful,
  17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 ;; GNU General Public License for more details.
  20
  21 ;; You should have received a copy of the GNU General Public License
  22 ;; along with GNU Emacs; see the file COPYING.  If not, write to
  23 ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  24
  25 ;;; Code:
  26
  27 ;;>>TODO
  28 ;;>> ** Nothing can be done about emacs' meta-lossage **
  29 ;;>>  (without redoing keymaps `sanely' -- ask Mly for details)
  30
  31 ;;>> One probably wants to do setenv MORE -c when running with
  32 ;;>>   more-processing enabled.
  33
  34 (require 'ehelp)
  35
  36 (defvar terminal-escape-char ?\C-^
  37   "*All characters except for this are passed verbatim through the
  38 terminal-emulator.  This character acts as a prefix for commands
  39 to the emulator program itself.  Type this character twice to send
  40 it through the emulator.  Type ? after typing it for a list of
  41 possible commands.
  42 This variable is local to each terminal-emulator buffer.")
  43
  44 (defvar terminal-scrolling t ;;>> Setting this to T sort-of defeats my whole aim in writing this package...
  45   "*If non-nil, the terminal-emulator will losingly `scroll' when output occurs
  46 past the bottom of the screen.  If nil, output will win and `wrap' to the top
  47 of the screen.
  48 This variable is local to each terminal-emulator buffer.")
  49
  50 (defvar terminal-more-processing t
  51   "*If non-nil, do more-processing.
  52 This variable is local to each terminal-emulator buffer.")
  53
  54 ;; If you are the sort of loser who uses scrolling without more breaks
  55 ;; and expects to actually see anything, you should probably set this to
  56 ;; around 400
  57 (defvar terminal-redisplay-interval 5000
  58   "*Maximum number of characters which will be processed by the
  59 terminal-emulator before a screen redisplay is forced.
  60 Set this to a large value for greater throughput,
  61 set it smaller for more frequent updates but overall slower
  62 performance.")
  63
  64 (defvar terminal-more-break-insertion
  65   "*** More break -- Press space to continue ***")
  66
  67 (defvar terminal-meta-map nil)
  68 (if terminal-meta-map
  69     nil
  70   (let ((map (make-sparse-keymap)))
  71     (define-key map [t] 'te-pass-through)
  72     (setq terminal-meta-map map)))
  73
  74 (defvar terminal-map nil)
  75 (if terminal-map
  76     nil
  77   (let ((map (make-sparse-keymap)))
  78     (define-key map [t] 'te-pass-through)
  79     (define-key map [switch-frame] 'handle-switch-frame)
  80     (define-key map "\e" terminal-meta-map)
  81     ;(define-key map "\C-l"
  82     ;  '(lambda () (interactive) (te-pass-through) (redraw-display)))
  83     (setq terminal-map map)))
  84
  85 (defvar terminal-escape-map nil)
  86 (if terminal-escape-map
  87     nil
  88   (let ((map (make-sparse-keymap)))
  89     (define-key map [t] 'undefined)
  90     (let ((s "0"))
  91       (while (<= (aref s 0) ?9)
  92         (define-key map s 'digit-argument)
  93         (aset s 0 (1+ (aref s 0)))))
  94     (define-key map "b" 'switch-to-buffer)
  95     (define-key map "o" 'other-window)
  96     (define-key map "e" 'te-set-escape-char)
  97     (define-key map "\C-l" 'redraw-display)
  98     (define-key map "\C-o" 'te-flush-pending-output)
  99     (define-key map "m" 'te-toggle-more-processing)
 100     (define-key map "x" 'te-escape-extended-command)
 101     ;;>> What use is this?  Why is it in the default terminal-emulator map?
 102     (define-key map "w" 'te-edit)
 103     (define-key map "?" 'te-escape-help)
 104     (define-key map (char-to-string help-char) 'te-escape-help)
 105     (setq terminal-escape-map map)))
 106
 107 (defvar te-escape-command-alist nil)
 108 (if te-escape-command-alist
 109     nil
 110   (setq te-escape-command-alist
 111         '(("Set Escape Character" . te-set-escape-char)
 112           ;;>> What use is this?  Why is it in the default terminal-emulator map?
 113           ("Edit" . te-edit)
 114           ("Refresh" . redraw-display)
 115           ("Record Output" . te-set-output-log)
 116           ("Photo" . te-set-output-log)
 117           ("Tofu" . te-tofu) ;; confuse the uninitiated
 118           ("Stuff Input" . te-stuff-string)
 119           ("Flush Pending Output" . te-flush-pending-output)
 120           ("Enable More Processing" . te-enable-more-processing)
 121           ("Disable More Processing" . te-disable-more-processing)
 122           ("Scroll at end of page" . te-do-scrolling)
 123           ("Wrap at end of page" . te-do-wrapping)
 124           ("Switch To Buffer" . switch-to-buffer)
 125           ("Other Window" . other-window)
 126           ("Kill Buffer" . kill-buffer)
 127           ("Help" . te-escape-help)
 128           ("Set Redisplay Interval" . te-set-redisplay-interval)
 129           )))
 130
 131 (defvar terminal-more-break-map nil)
 132 (if terminal-more-break-map
 133     nil
 134   (let ((map (make-sparse-keymap)))
 135     (define-key map [t] 'te-more-break-unread)
 136     (define-key map (char-to-string help-char) 'te-more-break-help)
 137     (define-key map " " 'te-more-break-resume)
 138     (define-key map "\C-l" 'redraw-display)
 139     (define-key map "\C-o" 'te-more-break-flush-pending-output)
 140     ;;>>> this isn't right
 141     ;(define-key map "\^?" 'te-more-break-flush-pending-output) ;DEL
 142     (define-key map "\r" 'te-more-break-advance-one-line)
 143
 144     (setq terminal-more-break-map map)))
 145
 146 \f
 147 ;;; Pacify the byte compiler
 148 (defvar te-process nil)
 149 (defvar te-log-buffer nil)
 150 (defvar te-height nil)
 151 (defvar te-width nil)
 152 (defvar te-more-count nil)
 153 (defvar te-redisplay-count nil)
 154 (defvar te-pending-output nil)
 155 (defvar te-saved-point)
 156 (defvar te-more-old-point nil)
 157 (defvar te-more-old-local-map nil)
 158 (defvar te-more-old-filter nil)
 159 (defvar te-more-old-mode-line-format nil)
 160 (defvar te-pending-output-info nil)
 161
 162 ;; Required to support terminfo systems
 163 (defconst te-terminal-name-prefix "emacs-virtual")
 164 (defvar te-terminal-name nil)
 165 \f
 166 ;;;;  escape map
 167
 168 (defun te-escape ()
 169   (interactive)
 170   (let (s
 171         (local (current-local-map))
 172         (global (current-global-map)))
 173     (unwind-protect
 174         (progn
 175           (use-global-map terminal-escape-map)
 176           (use-local-map terminal-escape-map)
 177           (setq s (read-key-sequence
 178                     (if prefix-arg
 179                         (format "Emacs Terminal escape> %d "
 180                                 (prefix-numeric-value prefix-arg))
 181                         "Emacs Terminal escape> "))))
 182       (use-global-map global)
 183       (use-local-map local))
 184     (message "")
 185     (cond ((string= s (make-string 1 terminal-escape-char))
 186            (setq last-command-char terminal-escape-char)
 187            (let ((terminal-escape-char -259))
 188              (te-pass-through)))
 189           ((setq s (lookup-key terminal-escape-map s))
 190            (call-interactively s)))))
 191
 192 (defun te-escape-help ()
 193   "Provide help on commands available after terminal-escape-char is typed."
 194   (interactive)
 195   (message "Terminal emulator escape help...")
 196   (let ((char (single-key-description terminal-escape-char)))
 197     (with-electric-help
 198       (function (lambda ()
 199          (princ (format "Terminal-emulator escape, invoked by \"%s\"
 200 Type \"%s\" twice to send a single \"%s\" through.
 201
 202 Other chars following \"%s\" are interpreted as follows:\n"
 203                         char char char char))
 204
 205          (princ (substitute-command-keys "\\{terminal-escape-map}\n"))
 206          (princ (format "\nSubcommands of \"%s\" (%s)\n"
 207                         (where-is-internal 'te-escape-extended-command
 208                                            terminal-escape-map t)
 209                         'te-escape-extended-command))
 210          (let ((l (if (fboundp 'sortcar)
 211                       (sortcar (copy-sequence te-escape-command-alist)
 212                                'string<)
 213                       (sort (copy-sequence te-escape-command-alist)
 214                             (function (lambda (a b)
 215                               (string< (car a) (car b))))))))
 216            (while l
 217              (let ((doc (or (documentation (cdr (car l)))
 218                             "Not documented")))
 219                (if (string-match "\n" doc)
 220                    ;; just use first line of documentation
 221                    (setq doc (substring doc 0 (match-beginning 0))))
 222                (princ "  \"")
 223                (princ (car (car l)))
 224                (princ "\":\n     ")
 225                (princ doc)
 226                (write-char ?\n))
 227              (setq l (cdr l))))
 228          nil)))))
 229
 230
 231
 232 (defun te-escape-extended-command ()
 233   (interactive)
 234   (let ((c (let ((completion-ignore-case t))
 235              (completing-read "terminal command: "
 236                               te-escape-command-alist
 237                               nil t))))
 238     (if c
 239         (catch 'foo
 240           (setq c (downcase c))
 241           (let ((l te-escape-command-alist))
 242             (while l
 243               (if (string= c (downcase (car (car l))))
 244                   (throw 'foo (call-interactively (cdr (car l))))
 245                 (setq l (cdr l)))))))))
 246
 247 ;; not used.
 248 (defun te-escape-extended-command-unread ()
 249   (interactive)
 250   (setq unread-command-events (listify-key-sequence (this-command-keys)))
 251   (te-escape-extended-command))
 252
 253 (defun te-set-escape-char (c)
 254   "Change the terminal-emulator escape character."
 255   (interactive "cSet escape character to: ")
 256   (let ((o terminal-escape-char))
 257     (message (if (= o c)
 258                  "\"%s\" is the escape char"
 259                  "\"%s\" is now the escape; \"%s\" passes through")
 260              (single-key-description c)
 261              (single-key-description o))
 262     (setq terminal-escape-char c)))
 263
 264
 265 (defun te-stuff-string (string)
 266   "Read a string to send to through the terminal emulator
 267 as though that string had been typed on the keyboard.
 268
 269 Very poor man's file transfer protocol."
 270   (interactive "sStuff string: ")
 271   (process-send-string te-process string))
 272
 273 (defun te-set-output-log (name)
 274   "Record output from the terminal emulator in a buffer."
 275   (interactive (list (if te-log-buffer
 276                          nil
 277                        (read-buffer "Record output in buffer: "
 278                                     (format "%s output-log"
 279                                             (buffer-name (current-buffer)))
 280                                     nil))))
 281   (if (or (null name) (equal name ""))
 282       (progn (setq te-log-buffer nil)
 283              (message "Output logging off."))
 284     (if (get-buffer name)
 285         nil
 286       (save-excursion
 287         (set-buffer (get-buffer-create name))
 288         (fundamental-mode)
 289         (buffer-disable-undo (current-buffer))
 290         (erase-buffer)))
 291     (setq te-log-buffer (get-buffer name))
 292     (message "Recording terminal emulator output into buffer \"%s\""
 293              (buffer-name te-log-buffer))))
 294
 295 (defun te-tofu ()
 296   "Discontinue output log."
 297   (interactive)
 298   (te-set-output-log nil))
 299
 300
 301 (defun te-toggle (sym arg)
 302   (set sym (cond ((not (numberp arg)) arg)
 303                  ((= arg 1) (not (symbol-value sym)))
 304                  ((< arg 0) nil)
 305                  (t t))))
 306
 307 (defun te-toggle-more-processing (arg)
 308   (interactive "p")
 309   (message (if (te-toggle 'terminal-more-processing arg)
 310                "More processing on" "More processing off"))
 311   (if terminal-more-processing (setq te-more-count -1)))
 312
 313 (defun te-toggle-scrolling (arg)
 314   (interactive "p")
 315   (message (if (te-toggle 'terminal-scrolling arg)
 316                "Scroll at end of page" "Wrap at end of page")))
 317
 318 (defun te-enable-more-processing ()
 319   "Enable ** MORE ** processing"
 320   (interactive)
 321   (te-toggle-more-processing t))
 322
 323 (defun te-disable-more-processing ()
 324   "Disable ** MORE ** processing"
 325   (interactive)
 326   (te-toggle-more-processing nil))
 327
 328 (defun te-do-scrolling ()
 329   "Scroll at end of page (yuck)"
 330   (interactive)
 331   (te-toggle-scrolling t))
 332
 333 (defun te-do-wrapping ()
 334   "Wrap to top of window at end of page"
 335   (interactive)
 336   (te-toggle-scrolling nil))
 337
 338
 339 (defun te-set-redisplay-interval (arg)
 340   "Set the maximum interval (in output characters) between screen updates.
 341 Set this number to large value for greater throughput,
 342 set it smaller for more frequent updates (but overall slower performance."
 343   (interactive "NMax number of output chars between redisplay updates: ")
 344   (setq arg (max arg 1))
 345   (setq terminal-redisplay-interval arg
 346         te-redisplay-count 0))
 347 \f
 348 ;;;; more map
 349
 350 ;; every command -must- call te-more-break-unwind
 351 ;; or grave lossage will result
 352
 353 (put 'te-more-break-unread 'suppress-keymap t)
 354 (defun te-more-break-unread ()
 355   (interactive)
 356   (if (eq last-input-char terminal-escape-char)
 357       (call-interactively 'te-escape)
 358     (message "Continuing from more break (\"%s\" typed, %d chars output pending...)"
 359              (single-key-description last-input-char)
 360              (te-pending-output-length))
 361     (setq te-more-count 259259)
 362     (te-more-break-unwind)
 363     (let ((terminal-more-processing nil))
 364       (te-pass-through))))
 365
 366 (defun te-more-break-resume ()
 367   "Proceed past the **MORE** break,
 368 allowing the next page of output to appear"
 369   (interactive)
 370   (message "Continuing from more break")
 371   (te-more-break-unwind))
 372
 373 (defun te-more-break-help ()
 374   "Provide help on commands available in a terminal-emulator **MORE** break"
 375   (interactive)
 376   (message "Terminal-emulator more break help...")
 377   (sit-for 0)
 378   (with-electric-help
 379     (function (lambda ()
 380       (princ "Terminal-emulator more break.\n\n")
 381       (princ (format "Type \"%s\" (te-more-break-resume)\n%s\n"
 382                      (where-is-internal 'te-more-break-resume
 383                                         terminal-more-break-map t)
 384                      (documentation 'te-more-break-resume)))
 385       (princ (substitute-command-keys "\\{terminal-more-break-map}\n"))
 386       (princ "Any other key is passed through to the program
 387 running under the terminal emulator and disables more processing until
 388 all pending output has been dealt with.")
 389       nil))))
 390
 391
 392 (defun te-more-break-advance-one-line ()
 393   "Allow one more line of text to be output before doing another more break."
 394   (interactive)
 395   (setq te-more-count 1)
 396   (te-more-break-unwind))
 397
 398 (defun te-more-break-flush-pending-output ()
 399   "Discard any output which has been received by the terminal emulator but
 400 not yet processed and then proceed from the more break."
 401   (interactive)
 402   (te-more-break-unwind)
 403   (te-flush-pending-output))
 404
 405 (defun te-flush-pending-output ()
 406   "Discard any as-yet-unprocessed output which has been received by
 407 the terminal emulator."
 408   (interactive)
 409   ;; this could conceivably be confusing in the presence of
 410   ;; escape-sequences spanning process-output chunks
 411   (if (null (cdr te-pending-output))
 412       (message "(There is no output pending)")
 413     (let ((length (te-pending-output-length)))
 414       (message "Flushing %d chars of pending output" length)
 415       (setq te-pending-output
 416             (list 0 (format "\n*** %d chars of pending output flushed ***\n"
 417                             length)))
 418       (te-update-pending-output-display)
 419       (te-process-output nil)
 420       (sit-for 0))))
 421
 422 \f
 423 (defun te-pass-through ()
 424   "Character is passed to the program running under the terminal emulator.
 425 One characters is treated specially:
 426 the terminal escape character (normally C-^)
 427 lets you type a terminal emulator command."
 428   (interactive)
 429   (cond ((eq last-input-char terminal-escape-char)
 430          (call-interactively 'te-escape))
 431         (t
 432          ;; Convert `return' to C-m, etc.
 433          (if (and (symbolp last-input-char)
 434                   (get last-input-char 'ascii-character))
 435              (setq last-input-char (get last-input-char 'ascii-character)))
 436          ;; Convert meta characters to 8-bit form for transmission.
 437          (if (and (integerp last-input-char)
 438                   (not (zerop (logand last-input-char ?\M-\^@))))
 439              (setq last-input-char (+ 128 (logand last-input-char 127))))
 440          ;; Now ignore all but actual characters.
 441          ;; (It ought to be possible to send through function
 442          ;; keys as character sequences if we add a description
 443          ;; to our termcap entry of what they should look like.)
 444          (if (integerp last-input-char)
 445              (progn
 446                (and terminal-more-processing (null (cdr te-pending-output))
 447                     (te-set-more-count nil))
 448                (send-string te-process (make-string 1 last-input-char))
 449                (te-process-output t))
 450            (message "Function key `%s' ignored"
 451                     (single-key-description last-input-char))))))
 452
 453
 454 (defun te-set-window-start ()
 455   (let* ((w (get-buffer-window (current-buffer)))
 456          (h (if w (window-height w))))
 457     (cond ((not w)) ; buffer not displayed
 458           ((>= h (/ (- (point) (point-min)) (1+ te-width)))
 459            ;; this is the normal case
 460            (set-window-start w (point-min)))
 461           ;; this happens if some vandal shrinks our window.
 462           ((>= h (/ (- (point-max) (point)) (1+ te-width)))
 463            (set-window-start w (- (point-max) (* h (1+ te-width)) -1)))
 464           ;; I give up.
 465           (t nil))))
 466
 467 (defun te-pending-output-length ()
 468   (let ((length (car te-pending-output))
 469         (tem (cdr te-pending-output)))
 470     (while tem
 471       (setq length (+ length (length (car tem))) tem (cdr tem)))
 472     length))
 473 \f
 474 ;;>> What use is this terminal-edit stuff anyway?
 475 ;;>>  If nothing else, it was written by somebody who didn't
 476 ;;>>  competently understand the terminal-emulator...
 477
 478 (defvar terminal-edit-map nil)
 479 (if terminal-edit-map
 480     nil
 481   (setq terminal-edit-map (make-sparse-keymap))
 482   (define-key terminal-edit-map "\C-c\C-c" 'terminal-cease-edit))
 483
 484 ;; Terminal Edit mode is suitable only for specially formatted data.
 485 (put 'terminal-edit-mode 'mode-class 'special)
 486
 487 (defun terminal-edit-mode ()
 488   "Major mode for editing the contents of a terminal-emulator buffer.
 489 The editing commands are the same as in Fundamental mode,
 490 together with a command \\<terminal-edit-map>to return to terminal emulation: \\[terminal-cease-edit]."
 491   (use-local-map terminal-edit-map)
 492   (setq major-mode 'terminal-edit-mode)
 493   (setq mode-name "Terminal Edit")
 494   (setq mode-line-modified (default-value 'mode-line-modified))
 495   (setq mode-line-process nil)
 496   (run-hooks 'terminal-edit-mode-hook))
 497
 498 (defun te-edit ()
 499   "Start editing the terminal emulator buffer with ordinary Emacs commands."
 500   (interactive)
 501   (terminal-edit-mode)
 502   (set-buffer-modified-p (buffer-modified-p))
 503   ;; Make mode line update.
 504   (if (eq (key-binding "\C-c\C-c") 'terminal-cease-edit)
 505       (message "Editing: Type C-c C-c to return to Terminal")
 506     (message (substitute-command-keys
 507                "Editing: Type \\[terminal-cease-edit] to return to Terminal"))))
 508
 509 (defun terminal-cease-edit ()
 510   "Finish editing message; switch back to Terminal proper."
 511   (interactive)
 512
 513   ;;>> emulator will blow out if buffer isn't exactly te-width x te-height
 514   (let ((buffer-read-only nil))
 515     (widen)
 516     (let ((opoint (point-marker))
 517           (width te-width)
 518           (h (1- te-height)))
 519       (goto-char (point-min))
 520       (while (>= h 0)
 521         (let ((p (point)))
 522           (cond ((search-forward "\n" (+ p width) 'move)
 523                  (forward-char -1)
 524                  (insert-char ?\  (- width (- (point) p)))
 525                  (forward-char 1))
 526                 ((eobp)
 527                  (insert-char ?\  (- width (- (point) p))))
 528                 ((= (following-char) ?\n)
 529                  (forward-char 1))
 530                 (t
 531                  (setq p (point))
 532                  (if (search-forward "\n" nil t)
 533                      (delete-region p (1- (point)))
 534                      (delete-region p (point-max))))))
 535         (if (= h 0)
 536             (if (not (eobp)) (delete-region (point) (point-max)))
 537             (if (eobp) (insert ?\n)))
 538         (setq h (1- h)))
 539       (goto-char opoint)
 540       (set-marker opoint nil nil)
 541       (setq te-saved-point (point))
 542       (setq te-redisplay-count 0)
 543       (setq te-more-count -1)))
 544
 545   (setq mode-line-modified (default-value 'mode-line-modified))
 546   (use-local-map terminal-map)
 547   (setq major-mode 'terminal-mode)
 548   (setq mode-name "terminal")
 549   (setq mode-line-process '(":%s")))
 550 \f
 551 ;;;; more break hair
 552
 553 (defun te-more-break ()
 554   (te-set-more-count t)
 555   (make-local-variable 'te-more-old-point)
 556   (setq te-more-old-point (point))
 557   (make-local-variable 'te-more-old-local-map)
 558   (setq te-more-old-local-map (current-local-map))
 559   (use-local-map terminal-more-break-map)
 560   (make-local-variable 'te-more-old-filter)
 561   (setq te-more-old-filter (process-filter te-process))
 562   (make-local-variable 'te-more-old-mode-line-format)
 563   (setq te-more-old-mode-line-format mode-line-format
 564         mode-line-format (list "--   **MORE**  "
 565                                mode-line-buffer-identification
 566                                "%-"))
 567   (set-process-filter te-process
 568     (function (lambda (process string)
 569                 (save-excursion
 570                   (set-buffer (process-buffer process))
 571                   (setq te-pending-output (nconc te-pending-output
 572                                                  (list string))))
 573                   (te-update-pending-output-display))))
 574   (te-update-pending-output-display)
 575   (if (eq (window-buffer (selected-window)) (current-buffer))
 576       (message "More break "))
 577   (or (eobp)
 578       (null terminal-more-break-insertion)
 579       (save-excursion
 580         (forward-char 1)
 581         (delete-region (point) (+ (point) te-width))
 582         (insert terminal-more-break-insertion)))
 583   (run-hooks 'terminal-more-break-hook)
 584   (sit-for 0) ;get display to update
 585   (throw 'te-process-output t))
 586
 587 (defun te-more-break-unwind ()
 588   (use-local-map te-more-old-local-map)
 589   (set-process-filter te-process te-more-old-filter)
 590   (goto-char te-more-old-point)
 591   (setq mode-line-format te-more-old-mode-line-format)
 592   (set-buffer-modified-p (buffer-modified-p))
 593   (let ((buffer-read-only nil))
 594     (cond ((eobp))
 595           (terminal-more-break-insertion
 596            (forward-char 1)
 597            (delete-region (point)
 598                           (+ (point) (length terminal-more-break-insertion)))
 599            (insert-char ?\  te-width)
 600            (goto-char te-more-old-point)))
 601     (setq te-more-old-point nil)
 602     (let ((te-more-count 259259))
 603       (te-newline)))
 604   ;(sit-for 0)
 605   (te-process-output t))
 606
 607 (defun te-set-more-count (newline)
 608   (let ((line (/ (- (point) (point-min)) (1+ te-width))))
 609     (if newline (setq line (1+ line)))
 610     (cond ((= line te-height)
 611            (setq te-more-count te-height))
 612           ;>>>> something is strange.  Investigate this!
 613           ((= line (1- te-height))
 614            (setq te-more-count te-height))
 615           ((or (< line (/ te-height 2))
 616                (> (- te-height line) 10))
 617            ;; break at end of this page
 618            (setq te-more-count (- te-height line)))
 619           (t
 620            ;; migrate back towards top (ie bottom) of screen.
 621            (setq te-more-count (- te-height
 622                                   (if (> te-height 10) 2 1)))))))
 623
 624 \f
 625 ;;;; More or less straight-forward terminal escapes
 626
 627 ;; ^j, meaning `newline' to non-display programs.
 628 ;; (Who would think of ever writing a system which doesn't understand
 629 ;;  display terminals natively?  Un*x:  The Operating System of the Future.)
 630 (defun te-newline ()
 631   "Move down a line, optionally do more processing, perhaps wrap/scroll,
 632 move to start of new line, clear to end of line."
 633   (end-of-line)
 634   (cond ((not terminal-more-processing))
 635         ((< (setq te-more-count (1- te-more-count)) 0)
 636          (te-set-more-count t))
 637         ((eql te-more-count 0)
 638          ;; this doesn't return
 639          (te-more-break)))
 640   (if (eobp)
 641       (progn
 642         (delete-region (point-min) (+ (point-min) te-width))
 643         (goto-char (point-min))
 644         (if terminal-scrolling
 645             (progn (delete-char 1)
 646                    (goto-char (point-max))
 647                    (insert ?\n))))
 648     (forward-char 1)
 649     (delete-region (point) (+ (point) te-width)))
 650   (insert-char ?\  te-width)
 651   (beginning-of-line)
 652   (te-set-window-start))
 653
 654 ; ^p = x+32 y+32
 655 (defun te-move-to-position ()
 656   ;; must offset by #o40 since cretinous unix won't send a 004 char through
 657   (let ((y (- (te-get-char) 32))
 658         (x (- (te-get-char) 32)))
 659     (if (or (> x te-width)
 660             (> y te-height))
 661         ()
 662       (goto-char (+ (point-min) x (* y (1+ te-width))))
 663       ;(te-set-window-start?)
 664       ))
 665   (setq te-more-count -1))
 666
 667
 668
 669 ;; ^p c
 670 (defun te-clear-rest-of-line ()
 671   (save-excursion
 672     (let ((n (- (point) (progn (end-of-line) (point)))))
 673       (delete-region (point) (+ (point) n))
 674       (insert-char ?\  (- n)))))
 675
 676
 677 ;; ^p C
 678 (defun te-clear-rest-of-screen ()
 679   (save-excursion
 680     (te-clear-rest-of-line)
 681     (while (progn (end-of-line) (not (eobp)))
 682       (forward-char 1) (end-of-line)
 683       (delete-region (- (point) te-width) (point))
 684       (insert-char ?\  te-width))))
 685
 686
 687 ;; ^p ^l
 688 (defun te-clear-screen ()
 689   ;; regenerate buffer to compensate for (nonexistent!!) bugs.
 690   (erase-buffer)
 691   (let ((i 0))
 692     (while (< i te-height)
 693       (setq i (1+ i))
 694       (insert-char ?\  te-width)
 695       (insert ?\n)))
 696   (delete-region (1- (point-max)) (point-max))
 697   (goto-char (point-min))
 698   (setq te-more-count -1))
 699
 700
 701 ;; ^p ^o count+32
 702 (defun te-insert-lines ()
 703   (if (not (bolp))
 704       ();(error "fooI")
 705     (save-excursion
 706       (let* ((line (- te-height (/ (- (point) (point-min)) (1+ te-width)) -1))
 707              (n (min (- (te-get-char) ?\ ) line))
 708              (i 0))
 709         (delete-region (- (point-max) (* n (1+ te-width))) (point-max))
 710         (if (eql (point) (point-max)) (insert ?\n))
 711         (while (< i n)
 712           (setq i (1+ i))
 713           (insert-char ?\  te-width)
 714           (or (eql i line) (insert ?\n))))))
 715   (setq te-more-count -1))
 716
 717
 718 ;; ^p ^k count+32
 719 (defun te-delete-lines ()
 720   (if (not (bolp))
 721       ();(error "fooD")
 722     (let* ((line (- te-height (/ (- (point) (point-min)) (1+ te-width)) -1))
 723            (n (min (- (te-get-char) ?\ ) line))
 724            (i 0))
 725       (delete-region (point)
 726                      (min (+ (point) (* n (1+ te-width))) (point-max)))
 727       (save-excursion
 728         (goto-char (point-max))
 729         (while (< i n)
 730           (setq i (1+ i))
 731           (insert-char ?\  te-width)
 732           (or (eql i line) (insert ?\n))))))
 733   (setq te-more-count -1))
 734
 735 ;; ^p ^a
 736 (defun te-beginning-of-line ()
 737   (beginning-of-line))
 738
 739 ;; ^p ^b
 740 (defun te-backward-char ()
 741   (if (not (bolp))
 742       (backward-char 1)))
 743
 744 ;; ^p ^f
 745 (defun te-forward-char ()
 746   (if (not (eolp))
 747       (forward-char 1)))
 748
 749 \f
 750 ;; 0177
 751 (defun te-delete ()
 752   (if (bolp)
 753       ()
 754     (delete-region (1- (point)) (point))
 755     (insert ?\ )
 756     (forward-char -1)))
 757
 758 ;; ^p ^g
 759 (defun te-beep ()
 760   (beep))
 761
 762
 763 ;; ^p _ count+32
 764 (defun te-insert-spaces ()
 765   (let* ((p (point))
 766          (n (min (- (te-get-char) 32)
 767                  (- (progn (end-of-line) (point)) p))))
 768     (if (<= n 0)
 769         nil
 770       (delete-char (- n))
 771       (goto-char p)
 772       (insert-char ?\  n))
 773     (goto-char p)))
 774
 775 ;; ^p d count+32  (should be ^p ^d but cretinous un*x won't send ^d chars!!!)
 776 (defun te-delete-char ()
 777   (let* ((p (point))
 778          (n (min (- (te-get-char) 32)
 779                  (- (progn (end-of-line) (point)) p))))
 780     (if (<= n 0)
 781         nil
 782       (insert-char ?\  n)
 783       (goto-char p)
 784       (delete-char n))
 785     (goto-char p)))
 786
 787
 788 \f
 789 ;; disgusting unix-required shit
 790 ;;  Are we living twenty years in the past yet?
 791
 792 (defun te-losing-unix ()
 793   nil)
 794
 795 ;; ^i
 796 (defun te-output-tab ()
 797   (let* ((p (point))
 798          (x (- p (progn (beginning-of-line) (point))))
 799          (l (min (- 8 (logand x 7))
 800                  (progn (end-of-line) (- (point) p)))))
 801     (goto-char (+ p l))))
 802
 803 ;; ^p ^j
 804 ;; Handle the `do' or `nl' termcap capability.
 805 ;;>> I am not sure why this broken, obsolete, capability is here.
 806 ;;>> Perhaps it is for VIle.  No comment was made about why it
 807 ;;>> was added (in "Sun Dec  6 01:22:27 1987  Richard Stallman")
 808 (defun te-down-vertically-or-scroll ()
 809   "Move down a line vertically, or scroll at bottom."
 810   (let ((column (current-column)))
 811     (end-of-line)
 812     (if (eobp)
 813         (progn
 814           (delete-region (point-min) (+ (point-min) te-width))
 815           (goto-char (point-min))
 816           (delete-char 1)
 817           (goto-char (point-max))
 818           (insert ?\n)
 819           (insert-char ?\  te-width)
 820           (beginning-of-line))
 821       (forward-line 1))
 822     (move-to-column column))
 823   (te-set-window-start))
 824
 825 ;; Also:
 826 ;;  ^m => beginning-of-line (for which it -should- be using ^p ^a, right?!!)
 827 ;;  ^g => te-beep (for which it should use ^p ^g)
 828 ;;  ^h => te-backward-char (for which it should use ^p ^b)
 829
 830 \f
 831
 832 (defun te-filter (process string)
 833   (let* ((obuf (current-buffer)))
 834     ;; can't use save-excursion, as that preserves point, which we don't want
 835     (unwind-protect
 836         (progn
 837           (set-buffer (process-buffer process))
 838           (goto-char te-saved-point)
 839           (and (bufferp te-log-buffer)
 840                (if (null (buffer-name te-log-buffer))
 841                    ;; killed
 842                    (setq te-log-buffer nil)
 843                  (set-buffer te-log-buffer)
 844                  (goto-char (point-max))
 845                  (insert-before-markers string)
 846                  (set-buffer (process-buffer process))))
 847           (setq te-pending-output (nconc te-pending-output (list string)))
 848           (te-update-pending-output-display)
 849           (te-process-output (eq (current-buffer)
 850                                  (window-buffer (selected-window))))
 851           (set-buffer (process-buffer process))
 852           (setq te-saved-point (point)))
 853       (set-buffer obuf))))
 854
 855 ;; (A version of the following comment which might be distractingly offensive
 856 ;; to some readers has been moved to term-nasty.el.)
 857 ;; unix lacks ITS-style tty control...
 858 (defun te-process-output (preemptable)
 859   ;;>> There seems no good reason to ever disallow preemption
 860   (setq preemptable t)
 861   (catch 'te-process-output
 862     (let ((buffer-read-only nil)
 863           (string nil) ostring start char (matchpos nil))
 864       (while (cdr te-pending-output)
 865         (setq ostring string
 866               start (car te-pending-output)
 867               string (car (cdr te-pending-output))
 868               char (aref string start))
 869         (if (eql (setq start (1+ start)) (length string))
 870             (progn (setq te-pending-output
 871                            (cons 0 (cdr (cdr te-pending-output)))
 872                          start 0
 873                          string (car (cdr te-pending-output)))
 874                    (te-update-pending-output-display))
 875             (setcar te-pending-output start))
 876         (if (and (> char ?\037) (< char ?\377))
 877             (cond ((eolp)
 878                    ;; unread char
 879                    (if (eql start 0)
 880                        (setq te-pending-output
 881                              (cons 0 (cons (make-string 1 char)
 882                                            (cdr te-pending-output))))
 883                        (setcar te-pending-output (1- start)))
 884                    (te-newline))
 885                   ((null string)
 886                    (delete-char 1) (insert char)
 887                    (te-redisplay-if-necessary 1))
 888                   (t
 889                    (let ((end (or (and (eq ostring string) matchpos)
 890                                   (setq matchpos (string-match
 891                                                    "[\000-\037\177-\377]"
 892                                                    string start))
 893                                   (length string))))
 894                      (delete-char 1) (insert char)
 895                      (setq char (point)) (end-of-line)
 896                      (setq end (min end (+ start (- (point) char))))
 897                      (goto-char char)
 898                      (if (eql end matchpos) (setq matchpos nil))
 899                      (delete-region (point) (+ (point) (- end start)))
 900                      (insert (if (and (eql start 0)
 901                                       (eql end (length string)))
 902                                  string
 903                                  (substring string start end)))
 904                      (if (eql end (length string))
 905                          (setq te-pending-output
 906                                (cons 0 (cdr (cdr te-pending-output))))
 907                          (setcar te-pending-output end))
 908                      (te-redisplay-if-necessary (1+ (- end start))))))
 909           ;; I suppose if I split the guts of this out into a separate
 910           ;;  function we could trivially emulate different terminals
 911           ;; Who cares in any case?  (Apart from stupid losers using rlogin)
 912           (funcall
 913             (if (eql char ?\^p)
 914                 (or (cdr (assq (te-get-char)
 915                                '((?= . te-move-to-position)
 916                                  (?c . te-clear-rest-of-line)
 917                                  (?C . te-clear-rest-of-screen)
 918                                  (?\C-o . te-insert-lines)
 919                                  (?\C-k . te-delete-lines)
 920                                  ;; not necessary, but help sometimes.
 921                                  (?\C-a . te-beginning-of-line)
 922                                  (?\C-b . te-backward-char)
 923                                  ;; should be C-d, but un*x
 924                                  ;;  pty's won't send \004 through!
 925                                  ;; Can you believe this?
 926                                  (?d . te-delete-char)
 927                                  (?_ . te-insert-spaces)
 928                                  ;; random
 929                                  (?\C-f . te-forward-char)
 930                                  (?\C-g . te-beep)
 931                                  (?\C-j . te-down-vertically-or-scroll)
 932                                  (?\C-l . te-clear-screen)
 933                                  )))
 934                     'te-losing-unix)
 935                 (or (cdr (assq char
 936                                '((?\C-j . te-newline)
 937                                  (?\177 . te-delete)
 938                                  ;; Did I ask to be sent these characters?
 939                                  ;; I don't remember doing so, either.
 940                                  ;; (Perhaps some operating system or
 941                                  ;; other is completely incompetent...)
 942                                  (?\C-m . te-beginning-of-line)
 943                                  (?\C-g . te-beep)
 944                                  (?\C-h . te-backward-char)
 945                                  (?\C-i . te-output-tab))))
 946                     'te-losing-unix)))
 947           (te-redisplay-if-necessary 1))
 948         (and preemptable
 949              (input-pending-p)
 950              ;; preemptable output!  Oh my!!
 951              (throw 'te-process-output t)))))
 952   ;; We must update window-point in every window displaying our buffer
 953   (let* ((s (selected-window))
 954          (w s))
 955     (while (not (eq s (setq w (next-window w))))
 956       (if (eq (window-buffer w) (current-buffer))
 957           (set-window-point w (point))))))
 958
 959 (defun te-get-char ()
 960   (if (cdr te-pending-output)
 961       (let ((start (car te-pending-output))
 962             (string (car (cdr te-pending-output))))
 963         (prog1 (aref string start)
 964           (if (eql (setq start (1+ start)) (length string))
 965               (setq te-pending-output (cons 0 (cdr (cdr te-pending-output))))
 966               (setcar te-pending-output start))))
 967     (catch 'char
 968       (let ((filter (process-filter te-process)))
 969         (unwind-protect
 970             (progn
 971               (set-process-filter te-process
 972                                   (function (lambda (p s)
 973                                     (or (eql (length s) 1)
 974                                         (setq te-pending-output (list 1 s)))
 975                                     (throw 'char (aref s 0)))))
 976               (accept-process-output te-process))
 977           (set-process-filter te-process filter))))))
 978
 979
 980 (defun te-redisplay-if-necessary (length)
 981   (and (<= (setq te-redisplay-count (- te-redisplay-count length)) 0)
 982        (eq (current-buffer) (window-buffer (selected-window)))
 983        (waiting-for-user-input-p)
 984        (progn (te-update-pending-output-display)
 985               (sit-for 0)
 986               (setq te-redisplay-count terminal-redisplay-interval))))
 987
 988 (defun te-update-pending-output-display ()
 989   (if (null (cdr te-pending-output))
 990       (setq te-pending-output-info "")
 991     (let ((length (te-pending-output-length)))
 992       (if (< length 1500)
 993           (setq te-pending-output-info "")
 994         (setq te-pending-output-info (format "(%dK chars output pending) "
 995                                              (/ (+ length 512) 1024))))))
 996   ;; update mode line
 997   (set-buffer-modified-p (buffer-modified-p)))
 998
 999 \f
1000 (defun te-sentinel (process message)
1001   (cond ((eq (process-status process) 'run))
1002         ((null (buffer-name (process-buffer process)))) ;deleted
1003         (t (let ((b (current-buffer)))
1004              (save-excursion
1005                (set-buffer (process-buffer process))
1006                (setq buffer-read-only nil)
1007                (fundamental-mode)
1008                (goto-char (point-max))
1009                (delete-blank-lines)
1010                (delete-horizontal-space)
1011                (insert "\n*******\n" message "*******\n"))
1012              (if (and (eq b (process-buffer process))
1013                       (waiting-for-user-input-p))
1014                  (progn (goto-char (point-max))
1015                         (recenter -1)))))))
1016 \f
1017 (defvar te-stty-string "stty -nl erase '^?' kill '^u' intr '^c' echo pass8"
1018   "Shell command to set terminal modes for terminal emulator.")
1019 ;; This used to have `new' in it, but that loses outside BSD
1020 ;; and it's apparently not needed in BSD.
1021
1022 (defvar explicit-shell-file-name nil
1023   "*If non-nil, is file name to use for explicitly requested inferior shell.")
1024
1025 ;;;###autoload
1026 (defun terminal-emulator (buffer program args &optional width height)
1027   "Under a display-terminal emulator in BUFFER, run PROGRAM on arguments ARGS.
1028 ARGS is a list of argument-strings.  Remaining arguments are WIDTH and HEIGHT.
1029 BUFFER's contents are made an image of the display generated by that program,
1030 and any input typed when BUFFER is the current Emacs buffer is sent to that
1031 program an keyboard input.
1032
1033 Interactively, BUFFER defaults to \"*terminal*\" and PROGRAM and ARGS
1034 are parsed from an input-string using your usual shell.
1035 WIDTH and HEIGHT are determined from the size of the current window
1036 -- WIDTH will be one less than the window's width, HEIGHT will be its height.
1037
1038 To switch buffers and leave the emulator, or to give commands
1039 to the emulator itself (as opposed to the program running under it),
1040 type Control-^.  The following character is an emulator command.
1041 Type Control-^ twice to send it to the subprogram.
1042 This escape character may be changed using the variable `terminal-escape-char'.
1043
1044 `Meta' characters may not currently be sent through the terminal emulator.
1045
1046 Here is a list of some of the variables which control the behaviour
1047 of the emulator -- see their documentation for more information:
1048 terminal-escape-char, terminal-scrolling, terminal-more-processing,
1049 terminal-redisplay-interval.
1050
1051 This function calls the value of terminal-mode-hook if that exists
1052 and is non-nil after the terminal buffer has been set up and the
1053 subprocess started."
1054   (interactive
1055     (cons (save-excursion
1056             (set-buffer (get-buffer-create "*terminal*"))
1057             (buffer-name (if (or (not (boundp 'te-process))
1058                                  (null te-process)
1059                                  (not (eq (process-status te-process)
1060                                           'run)))
1061                              (current-buffer)
1062                            (generate-new-buffer "*terminal*"))))
1063           (append
1064             (let* ((default-s
1065                      ;; Default shell is same thing M-x shell uses.
1066                      (or explicit-shell-file-name
1067                          (getenv "ESHELL")
1068                          (getenv "SHELL")
1069                          "/bin/sh"))
1070                    (s (read-string
1071                        (format "Run program in emulator: (default %s) "
1072                                default-s))))
1073               (if (equal s "")
1074                   (list default-s '())
1075                 (te-parse-program-and-args s))))))
1076   (switch-to-buffer buffer)
1077   (if (null width) (setq width (- (window-width (selected-window)) 1)))
1078   (if (null height) (setq height (- (window-height (selected-window)) 1)))
1079   (terminal-mode)
1080   (setq te-width width te-height height)
1081   (setq te-terminal-name (concat te-terminal-name-prefix "-" te-width
1082                                  te-height))
1083   (setq mode-line-buffer-identification
1084         (list (format "Emacs terminal %dx%d: %%b  " te-width te-height)
1085               'te-pending-output-info))
1086   (let ((buffer-read-only nil))
1087     (te-clear-screen))
1088   (let (process)
1089     (while (setq process (get-buffer-process (current-buffer)))
1090       (if (y-or-n-p (format "Kill process %s? " (process-name process)))
1091           (delete-process process)
1092         (error "Process %s not killed" (process-name process)))))
1093   (condition-case err
1094       (let ((process-environment
1095              (cons (concat "TERM=" te-terminal-name)
1096                    (cons (concat "TERMCAP=" (te-create-termcap))
1097                          (cons (concat "TERMINFO=" (te-create-terminfo))
1098                                process-environment)))))
1099         (setq te-process
1100               (start-process "terminal-emulator" (current-buffer)
1101                              "/bin/sh" "-c"
1102                              ;; Yuck!!! Start a shell to set some terminal
1103                              ;; control characteristics.  Then start the
1104                              ;; "env" program to setup the terminal type
1105                              ;; Then finally start the program we wanted.
1106                              (format "%s; exec %s"
1107                                      te-stty-string
1108                                      (mapconcat 'te-quote-arg-for-sh
1109                                                 (cons program args) " "))))
1110         (set-process-filter te-process 'te-filter)
1111         (set-process-sentinel te-process 'te-sentinel))
1112     (error (fundamental-mode)
1113            (signal (car err) (cdr err))))
1114   (setq inhibit-quit t)                 ;sport death
1115   (use-local-map terminal-map)
1116   (run-hooks 'terminal-mode-hook)
1117   (message "Entering emacs terminal-emulator...  Type %s %s for help"
1118            (single-key-description terminal-escape-char)
1119            (mapconcat 'single-key-description
1120                       (where-is-internal 'te-escape-help terminal-escape-map t)
1121                       " ")))
1122
1123
1124 (defun te-parse-program-and-args (s)
1125   (cond ((string-match "\\`\\([-a-zA-Z0-9+=_.@/:]+[ \t]*\\)+\\'" s)
1126          (let ((l ()) (p 0))
1127            (while p
1128              (setq l (cons (if (string-match
1129                                 "\\([-a-zA-Z0-9+=_.@/:]+\\)\\([ \t]+\\)*"
1130                                 s p)
1131                                (prog1 (substring s p (match-end 1))
1132                                  (setq p (match-end 0))
1133                                  (if (eql p (length s)) (setq p nil)))
1134                                (prog1 (substring s p)
1135                                  (setq p nil)))
1136                            l)))
1137            (setq l (nreverse l))
1138            (list (car l) (cdr l))))
1139         ((and (string-match "[ \t]" s) (not (file-exists-p s)))
1140          (list shell-file-name (list "-c" (concat "exec " s))))
1141         (t (list s ()))))
1142
1143 (put 'terminal-mode 'mode-class 'special)
1144 ;; This is only separated out from function terminal-emulator
1145 ;; to keep the latter a little more manageable.
1146 (defun terminal-mode ()
1147   "Set up variables for use with the terminal-emulator.
1148 One should not call this -- it is an internal function
1149 of the terminal-emulator"
1150   (kill-all-local-variables)
1151   (buffer-disable-undo (current-buffer))
1152   (setq major-mode 'terminal-mode)
1153   (setq mode-name "terminal")
1154 ; (make-local-variable 'Helper-return-blurb)
1155 ; (setq Helper-return-blurb "return to terminal simulator")
1156   (setq mode-line-process '(":%s"))
1157   (setq buffer-read-only t)
1158   (setq truncate-lines t)
1159   (make-local-variable 'terminal-escape-char)
1160   (setq terminal-escape-char (default-value 'terminal-escape-char))
1161   (make-local-variable 'terminal-scrolling)
1162   (setq terminal-scrolling (default-value 'terminal-scrolling))
1163   (make-local-variable 'terminal-more-processing)
1164   (setq terminal-more-processing (default-value 'terminal-more-processing))
1165   (make-local-variable 'terminal-redisplay-interval)
1166   (setq terminal-redisplay-interval (default-value 'terminal-redisplay-interval))
1167   (make-local-variable 'te-width)
1168   (make-local-variable 'te-height)
1169   (make-local-variable 'te-process)
1170   (make-local-variable 'te-pending-output)
1171   (setq te-pending-output (list 0))
1172   (make-local-variable 'te-saved-point)
1173   (setq te-saved-point (point-min))
1174   (make-local-variable 'te-pending-output-info) ;for the mode line
1175   (setq te-pending-output-info "")
1176   (make-local-variable 'inhibit-quit)
1177   ;(setq inhibit-quit t)
1178   (make-local-variable 'te-log-buffer)
1179   (setq te-log-buffer nil)
1180   (make-local-variable 'te-more-count)
1181   (setq te-more-count -1)
1182   (make-local-variable 'te-redisplay-count)
1183   (setq te-redisplay-count terminal-redisplay-interval)
1184   ;(use-local-map terminal-mode-map)
1185   ;; terminal-mode-hook is called above in function terminal-emulator
1186   )
1187 \f
1188 ;;;; what a complete loss
1189
1190 (defun te-quote-arg-for-sh (string)
1191   (cond ((string-match "\\`[-a-zA-Z0-9+=_.@/:]+\\'"
1192                        string)
1193          string)
1194         ((not (string-match "[$]" string))
1195          ;; "[\"\\]" are special to sh and the lisp reader in the same way
1196          (prin1-to-string string))
1197         (t
1198          (let ((harder "")
1199                (start 0)
1200                (end 0))
1201            (while (cond ((>= start (length string))
1202                          nil)
1203                         ;; this is the set of chars magic with "..." in `sh'
1204                         ((setq end (string-match "[\"\\$]"
1205                                                  string start))
1206                          t)
1207                         (t (setq harder (concat harder
1208                                                 (substring string start)))
1209                            nil))
1210              (setq harder (concat harder (substring string start end)
1211                                   ;; Can't use ?\\ since `concat'
1212                                   ;; unfortunately does prin1-to-string
1213                                   ;; on fixna.  Amazing.
1214                                   "\\"
1215                                   (substring string
1216                                              end
1217                                              (1+ end)))
1218                    start (1+ end)))
1219            (concat "\"" harder "\"")))))
1220
1221 (defun te-create-terminfo ()
1222   "Create and compile a terminfo entry for the virtual terminal. This is kept
1223 in the /tmp directory"
1224   (if (and system-uses-terminfo
1225            (not (file-exists-p (concat  "/tmp/"
1226                                         (substring te-terminal-name-prefix 0 1)
1227                                         "/" te-terminal-name))))
1228     (let ( (terminfo
1229             (concat
1230              (format "%s,mir, xon,cols#%d, lines#%d,"
1231                      te-terminal-name te-width te-height)
1232              "bel=^P^G, clear=^P\\f, cr=^P^A, cub1=^P^B, cud1=^P\\n,"
1233              "cuf1=^P^F, cup=^P=%p1%'\\s'%+%c%p2%'\\s'%+%c,"
1234              "dch=^Pd%p1%'\\s'%+%c, dch1=^Pd!, dl=^P^K%p1%'\\s'%+%c,"
1235              "dl1=^P^K!, ed=^PC, el=^Pc, home=^P=\\s\\s,"
1236              "ich=^P_%p1%'\\s'%+%c, ich1=^P_!, il=^P^O%p1%'\\s'%+%c,"
1237              "il1=^P^O!, ind=^P\\n, nel=\\n,"))
1238            (file-name (concat "/tmp/" te-terminal-name ".tif")) )
1239       (save-excursion
1240         (set-buffer (create-file-buffer file-name))
1241         (insert terminfo)
1242         (write-file file-name)
1243         (kill-buffer nil)
1244         )
1245       (let ( (process-environment
1246               (cons (concat "TERMINFO=" "/tmp")
1247                     process-environment)) )
1248         (set-process-sentinel (start-process "tic" nil "tic" file-name)
1249                               'te-tic-sentinel))))
1250     "/tmp"
1251 )
1252
1253 (defun te-create-termcap ()
1254   "Create a termcap entry for the virtual terminal"
1255   ;; Because of Unix Brain Death(tm), we can't change
1256   ;;  the terminal type of a running process, and so
1257   ;;  terminal size and scrollability are wired-down
1258   ;;  at this point.  ("Detach?  What's that?")
1259   (concat (format "%s:co#%d:li#%d:%s"
1260                   ;; Sigh.  These can't be dynamically changed.
1261                   te-terminal-name te-width te-height (if terminal-scrolling
1262                                          "" "ns:"))
1263           ;;-- Basic things
1264           ;; cursor-motion, bol, forward/backward char
1265           "cm=^p=%+ %+ :cr=^p^a:le=^p^b:nd=^p^f:"
1266           ;; newline, clear eof/eof, audible bell
1267           "nw=^j:ce=^pc:cd=^pC:cl=^p^l:bl=^p^g:"
1268           ;; insert/delete char/line
1269           "IC=^p_%+ :DC=^pd%+ :AL=^p^o%+ :DL=^p^k%+ :"
1270           ;;-- Not-widely-known (ie nonstandard) flags, which mean
1271           ;; o writing in the last column of the last line
1272           ;;   doesn't cause idiotic scrolling, and
1273           ;; o don't use idiotische c-s/c-q sogenannte
1274           ;;   ``flow control'' auf keinen Fall.
1275           "LP:NF:"
1276           ;;-- For stupid or obsolete programs
1277           "ic=^p_!:dc=^pd!:al=^p^o!:dl=^p^k!:ho=^p=  :"
1278           ;;-- For disgusting programs.
1279           ;; (VI? What losers need these, I wonder?)
1280           "im=:ei=:dm=:ed=:mi:do=^p^j:nl=^p^j:bs:")
1281 )
1282
1283 (defun te-tic-sentinel (proc state-change)
1284   "If tic has finished, delete the .tif file"
1285   (if (equal state-change "finished
1286 ")
1287       (delete-file (concat "/tmp/" te-terminal-name ".tif"))))
1288
1289 (provide 'terminal)
1290
1291 ;;; terminal.el ends here