summaryrefslogtreecommitdiff
path: root/lisp/terminal.el
blob: a015a91804755fd822b351e5cb17b5429ecb5816 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
;;; terminal.el --- terminal emulator for GNU Emacs

;; Copyright (C) 1986, 1987, 1988, 1989, 1993, 1994, 2001, 2002, 2003,
;;   2004, 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc.

;; Author: Richard Mlynarik <mly@eddie.mit.edu>
;; Maintainer: FSF
;; Keywords: comm, terminals

;; This file is part of GNU Emacs.

;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.

;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.

;;; Commentary:

;;; This file has been censored by the Communications Decency Act.
;;; That law was passed under the guise of a ban on pornography, but
;;; it bans far more than that.  This file did not contain pornography,
;;; but it was censored nonetheless.

;;; For information on US government censorship of the Internet, and
;;; what you can do to bring back freedom of the press, see the web
;;; site http://www.vtw.org/

;;; Code:

;;>>TODO
;;>> ** Nothing can be done about emacs' meta-lossage **
;;>>  (without redoing keymaps `sanely' -- ask Mly for details)

;;>> One probably wants to do setenv MORE -c when running with
;;>>   more-processing enabled.

(require 'ehelp)

(defgroup terminal nil
  "Terminal emulator for Emacs."
  :group 'terminals)


(defcustom terminal-escape-char ?\C-^
  "All characters except for this are passed verbatim through the
terminal-emulator.  This character acts as a prefix for commands
to the emulator program itself.  Type this character twice to send
it through the emulator.  Type ? after typing it for a list of
possible commands.
This variable is local to each terminal-emulator buffer."
  :type 'character
  :group 'terminal)

(defcustom terminal-scrolling t ;;>> Setting this to t sort-of defeats my whole aim in writing this package...
  "If non-nil, the terminal-emulator will losingly `scroll' when output occurs
past the bottom of the screen.  If nil, output will win and `wrap' to the top
of the screen.
This variable is local to each terminal-emulator buffer."
  :type 'boolean
  :group 'terminal)

(defcustom terminal-more-processing t
  "If non-nil, do more-processing.
This variable is local to each terminal-emulator buffer."
  :type 'boolean
  :group 'terminal)

;; If you are the sort of loser who uses scrolling without more breaks
;; and expects to actually see anything, you should probably set this to
;; around 400
(defcustom terminal-redisplay-interval 5000
  "Maximum number of characters which will be processed by the
terminal-emulator before a screen redisplay is forced.
Set this to a large value for greater throughput,
set it smaller for more frequent updates but overall slower
performance."
  :type 'integer
  :group 'terminal)

(defvar terminal-more-break-insertion
  "*** More break -- Press space to continue ***")

(defvar terminal-meta-map nil)
(if terminal-meta-map
    nil
  (let ((map (make-sparse-keymap)))
    (define-key map [t] 'te-pass-through)
    (setq terminal-meta-map map)))

(defvar terminal-map nil)
(if terminal-map
    nil
  (let ((map (make-sparse-keymap)))
    ;; Prevent defining [menu-bar] as te-pass-through
    ;; so we allow the global menu bar to be visible.
    (define-key map [menu-bar] (make-sparse-keymap))
    (define-key map [t] 'te-pass-through)
    (define-key map [switch-frame] 'handle-switch-frame)
    (define-key map "\e" terminal-meta-map)
    ;(define-key map "\C-l"
    ;  '(lambda () (interactive) (te-pass-through) (redraw-display)))
    (setq terminal-map map)))

(defvar terminal-escape-map nil)
(if terminal-escape-map
    nil
  (let ((map (make-sparse-keymap)))
    (define-key map [t] 'undefined)
    (let ((s "0"))
      (while (<= (aref s 0) ?9)
	(define-key map s 'digit-argument)
	(aset s 0 (1+ (aref s 0)))))
    (define-key map "b" 'switch-to-buffer)
    (define-key map "o" 'other-window)
    (define-key map "e" 'te-set-escape-char)
    (define-key map "\C-l" 'redraw-display)
    (define-key map "\C-o" 'te-flush-pending-output)
    (define-key map "m" 'te-toggle-more-processing)
    (define-key map "x" 'te-escape-extended-command)
    ;;>> What use is this?  Why is it in the default terminal-emulator map?
    (define-key map "w" 'te-edit)
    (define-key map "?" 'te-escape-help)
    (define-key map (char-to-string help-char) 'te-escape-help)
    (setq terminal-escape-map map)))

(defvar te-escape-command-alist nil)
(if te-escape-command-alist
    nil
  (setq te-escape-command-alist
	'(("Set Escape Character" . te-set-escape-char)
          ;;>> What use is this?  Why is it in the default terminal-emulator map?
	  ("Edit" . te-edit)
	  ("Refresh" . redraw-display)
	  ("Record Output" . te-set-output-log)
	  ("Photo" . te-set-output-log)
	  ("Tofu" . te-tofu) ;; confuse the uninitiated
	  ("Stuff Input" . te-stuff-string)
	  ("Flush Pending Output" . te-flush-pending-output)
	  ("Enable More Processing" . te-enable-more-processing)
	  ("Disable More Processing" . te-disable-more-processing)
	  ("Scroll at end of page" . te-do-scrolling)
	  ("Wrap at end of page" . te-do-wrapping)
	  ("Switch To Buffer" . switch-to-buffer)
	  ("Other Window" . other-window)
	  ("Kill Buffer" . kill-buffer)
	  ("Help" . te-escape-help)
	  ("Set Redisplay Interval" . te-set-redisplay-interval)
	  )))

(defvar terminal-more-break-map nil)
(if terminal-more-break-map
    nil
  (let ((map (make-sparse-keymap)))
    (define-key map [t] 'te-more-break-unread)
    (define-key map (char-to-string help-char) 'te-more-break-help)
    (define-key map " " 'te-more-break-resume)
    (define-key map "\C-l" 'redraw-display)
    (define-key map "\C-o" 'te-more-break-flush-pending-output)
    ;;>>> this isn't right
    ;(define-key map "\^?" 'te-more-break-flush-pending-output) ;DEL
    (define-key map "\r" 'te-more-break-advance-one-line)

    (setq terminal-more-break-map map)))


;;; Pacify the byte compiler
(defvar te-process nil)
(defvar te-log-buffer nil)
(defvar te-height nil)
(defvar te-width nil)
(defvar te-more-count nil)
(defvar te-redisplay-count nil)
(defvar te-pending-output nil)
(defvar te-saved-point)
(defvar te-more-old-point nil)
(defvar te-more-old-local-map nil)
(defvar te-more-old-filter nil)
(defvar te-more-old-mode-line-format nil)
(defvar te-pending-output-info nil)

;; Required to support terminfo systems
(defconst te-terminal-name-prefix "emacs-em"
  "Prefix used for terminal type names for Terminfo.")
(defconst te-terminfo-directory
  (file-name-as-directory
   (expand-file-name "emacs-terminfo" temporary-file-directory))
  "Directory used for run-time terminal definition files for Terminfo.")
(defvar te-terminal-name nil)

;;;;  escape map

(defun te-escape ()
  (interactive)
  (let (s
        (local (current-local-map))
        (global (current-global-map)))
    (unwind-protect
        (progn
          (use-global-map terminal-escape-map)
          (use-local-map terminal-escape-map)
          (setq s (read-key-sequence
                    (if current-prefix-arg
                        (format "Emacs Terminal escape[%s for help]> %d "
				(substitute-command-keys
				 "\\<terminal-escape-map>\\[te-escape-help]")
                                (prefix-numeric-value current-prefix-arg))
                        (format "Emacs Terminal escape[%s for help]> "
				(substitute-command-keys
				 "\\<terminal-escape-map>\\[te-escape-help]"))))))
      (use-global-map global)
      (use-local-map local))

    (message "")

    (cond
     ;;  Certain keys give vector notation, like [escape] when
     ;;  you hit esc key...
     ((and (stringp s)
	   (string= s (make-string 1 terminal-escape-char)))
      (setq last-command-event terminal-escape-char)
      (let ((terminal-escape-char -259))
	(te-pass-through)))

     ((setq s (lookup-key terminal-escape-map s))
      (call-interactively s)))

    ))


(defun te-escape-help ()
  "Provide help on commands available after terminal-escape-char is typed."
  (interactive)
  (message "Terminal emulator escape help...")
  (let ((char (single-key-description terminal-escape-char)))
    (with-electric-help
      (function (lambda ()
	 (princ (format "Terminal-emulator escape, invoked by \"%s\"
Type \"%s\" twice to send a single \"%s\" through.

Other chars following \"%s\" are interpreted as follows:\n"
			char char char char))

	 (princ (substitute-command-keys "\\{terminal-escape-map}\n"))
	 (princ (format "\nSubcommands of \"%s\" (%s)\n"
			(where-is-internal 'te-escape-extended-command
					   terminal-escape-map t)
			'te-escape-extended-command))
	 (let ((l (sort (copy-sequence te-escape-command-alist)
			(function (lambda (a b)
				    (string< (car a) (car b)))))))
	   (while l
	     (let ((doc (or (documentation (cdr (car l)))
			    "Not documented")))
	       (if (string-match "\n" doc)
		   ;; just use first line of documentation
		   (setq doc (substring doc 0 (match-beginning 0))))
	       (princ "  \"")
	       (princ (car (car l)))
	       (princ "\":\n     ")
	       (princ doc)
	       (write-char ?\n))
	     (setq l (cdr l))))
	 nil)))))



(defun te-escape-extended-command ()
  (interactive)
  (let ((c (let ((completion-ignore-case t))
	     (completing-read "terminal command: "
			      te-escape-command-alist
			      nil t))))
    (if c
	(catch 'foo
	  (setq c (downcase c))
	  (let ((l te-escape-command-alist))
	    (while l
	      (if (string= c (downcase (car (car l))))
		  (throw 'foo (call-interactively (cdr (car l))))
		(setq l (cdr l)))))))))

;; not used.
(defun te-escape-extended-command-unread ()
  (interactive)
  (setq unread-command-events (listify-key-sequence (this-command-keys)))
  (te-escape-extended-command))

(defun te-set-escape-char (c)
  "Change the terminal-emulator escape character."
  (interactive "cSet escape character to: ")
  (let ((o terminal-escape-char))
    (message (if (= o c)
		 "\"%s\" is the escape char"
	         "\"%s\" is now the escape; \"%s\" passes through")
	     (single-key-description c)
	     (single-key-description o))
    (setq terminal-escape-char c)))


(defun te-stuff-string (string)
  "Read a string to send to through the terminal emulator
as though that string had been typed on the keyboard.

Very poor man's file transfer protocol."
  (interactive "sStuff string: ")
  (process-send-string te-process string))

(defun te-set-output-log (name)
  "Record output from the terminal emulator in a buffer."
  (interactive (list (if te-log-buffer
			 nil
		       (read-buffer "Record output in buffer: "
				    (format "%s output-log"
					    (buffer-name (current-buffer)))
				    nil))))
  (if (or (null name) (equal name ""))
      (progn (setq te-log-buffer nil)
	     (message "Output logging off."))
    (if (get-buffer name)
	nil
      (save-excursion
	(set-buffer (get-buffer-create name))
	(fundamental-mode)
	(buffer-disable-undo (current-buffer))
	(erase-buffer)))
    (setq te-log-buffer (get-buffer name))
    (message "Recording terminal emulator output into buffer \"%s\""
	     (buffer-name te-log-buffer))))

(defun te-tofu ()
  "Discontinue output log."
  (interactive)
  (te-set-output-log nil))


(defun te-toggle (sym arg)
  (set sym (cond ((not (numberp arg)) arg)
		 ((= arg 1) (not (symbol-value sym)))
		 ((< arg 0) nil)
		 (t t))))

(defun te-toggle-more-processing (arg)
  (interactive "p")
  (message (if (te-toggle 'terminal-more-processing arg)
	       "More processing on" "More processing off"))
  (if terminal-more-processing (setq te-more-count -1)))

(defun te-toggle-scrolling (arg)
  (interactive "p")
  (message (if (te-toggle 'terminal-scrolling arg)
	       "Scroll at end of page" "Wrap at end of page")))

(defun te-enable-more-processing ()
  "Enable ** MORE ** processing"
  (interactive)
  (te-toggle-more-processing t))

(defun te-disable-more-processing ()
  "Disable ** MORE ** processing"
  (interactive)
  (te-toggle-more-processing nil))

(defun te-do-scrolling ()
  "Scroll at end of page (yuck)"
  (interactive)
  (te-toggle-scrolling t))

(defun te-do-wrapping ()
  "Wrap to top of window at end of page"
  (interactive)
  (te-toggle-scrolling nil))


(defun te-set-redisplay-interval (arg)
  "Set the maximum interval (in output characters) between screen updates.
Set this number to large value for greater throughput,
set it smaller for more frequent updates (but overall slower performance."
  (interactive "NMax number of output chars between redisplay updates: ")
  (setq arg (max arg 1))
  (setq terminal-redisplay-interval arg
	te-redisplay-count 0))

;;;; more map

;; every command -must- call te-more-break-unwind
;; or grave lossage will result

(put 'te-more-break-unread 'suppress-keymap t)
(defun te-more-break-unread ()
  (interactive)
  (if (eq last-input-event terminal-escape-char)
      (call-interactively 'te-escape)
    (message "Continuing from more break (\"%s\" typed, %d chars output pending...)"
	     (single-key-description last-input-event)
	     (te-pending-output-length))
    (setq te-more-count 259259)
    (te-more-break-unwind)
    (let ((terminal-more-processing nil))
      (te-pass-through))))

(defun te-more-break-resume ()
  "Proceed past the **MORE** break,
allowing the next page of output to appear"
  (interactive)
  (message "Continuing from more break")
  (te-more-break-unwind))

(defun te-more-break-help ()
  "Provide help on commands available in a terminal-emulator **MORE** break"
  (interactive)
  (message "Terminal-emulator more break help...")
  (sit-for 0)
  (with-electric-help
    (function (lambda ()
      (princ "Terminal-emulator more break.\n\n")
      (princ (format "Type \"%s\" (te-more-break-resume)\n%s\n"
		     (where-is-internal 'te-more-break-resume
					terminal-more-break-map t)
		     (documentation 'te-more-break-resume)))
      (princ (substitute-command-keys "\\{terminal-more-break-map}\n"))
      (princ "Any other key is passed through to the program
running under the terminal emulator and disables more processing until
all pending output has been dealt with.")
      nil))))


(defun te-more-break-advance-one-line ()
  "Allow one more line of text to be output before doing another more break."
  (interactive)
  (setq te-more-count 1)
  (te-more-break-unwind))

(defun te-more-break-flush-pending-output ()
  "Discard any output which has been received by the terminal emulator but
not yet processed and then proceed from the more break."
  (interactive)
  (te-more-break-unwind)
  (te-flush-pending-output))

(defun te-flush-pending-output ()
  "Discard any as-yet-unprocessed output which has been received by
the terminal emulator."
  (interactive)
  ;; this could conceivably be confusing in the presence of
  ;; escape-sequences spanning process-output chunks
  (if (null (cdr te-pending-output))
      (message "(There is no output pending)")
    (let ((length (te-pending-output-length)))
      (message "Flushing %d chars of pending output" length)
      (setq te-pending-output
	    (list 0 (format "\n*** %d chars of pending output flushed ***\n"
			    length)))
      (te-update-pending-output-display)
      (te-process-output nil)
      (sit-for 0))))


(defun te-pass-through ()
  "Character is passed to the program running under the terminal emulator.
One characters is treated specially:
the terminal escape character (normally C-^)
lets you type a terminal emulator command."
  (interactive)
  (cond ((eq last-input-event terminal-escape-char)
	 (call-interactively 'te-escape))
	(t
	 ;; Convert `return' to C-m, etc.
	 (if (and (symbolp last-input-event)
		  (get last-input-event 'ascii-character))
	     (setq last-input-event (get last-input-event 'ascii-character)))
	 ;; Convert meta characters to 8-bit form for transmission.
	 (if (and (integerp last-input-event)
		  (not (zerop (logand last-input-event ?\M-\^@))))
	     (setq last-input-event (+ 128 (logand last-input-event 127))))
	 ;; Now ignore all but actual characters.
	 ;; (It ought to be possible to send through function
	 ;; keys as character sequences if we add a description
	 ;; to our termcap entry of what they should look like.)
	 (if (integerp last-input-event)
	     (progn
	       (and terminal-more-processing (null (cdr te-pending-output))
		    (te-set-more-count nil))
	       (process-send-string te-process (make-string 1 last-input-event))
	       (te-process-output t))
	   (message "Function key `%s' ignored"
		    (single-key-description last-input-event))))))


(defun te-set-window-start ()
  (let* ((w (get-buffer-window (current-buffer)))
	 (h (if w (window-height w))))
    (cond ((not w)) ; buffer not displayed
	  ((>= h (/ (- (point) (point-min)) (1+ te-width)))
	   ;; this is the normal case
	   (set-window-start w (point-min)))
	  ;; this happens if some vandal shrinks our window.
	  ((>= h (/ (- (point-max) (point)) (1+ te-width)))
	   (set-window-start w (- (point-max) (* h (1+ te-width)) -1)))
	  ;; I give up.
	  (t nil))))

(defun te-pending-output-length ()
  (let ((length (car te-pending-output))
	(tem (cdr te-pending-output)))
    (while tem
      (setq length (+ length (length (car tem))) tem (cdr tem)))
    length))

;;>> What use is this terminal-edit stuff anyway?
;;>>  If nothing else, it was written by somebody who didn't
;;>>  competently understand the terminal-emulator...

(defvar terminal-edit-map nil)
(if terminal-edit-map
    nil
  (setq terminal-edit-map (make-sparse-keymap))
  (define-key terminal-edit-map "\C-c\C-c" 'terminal-cease-edit))

;; Terminal Edit mode is suitable only for specially formatted data.
(put 'terminal-edit-mode 'mode-class 'special)

(defun terminal-edit-mode ()
  "Major mode for editing the contents of a terminal-emulator buffer.
The editing commands are the same as in Fundamental mode,
together with a command \\<terminal-edit-map>to return to terminal emulation: \\[terminal-cease-edit]."
  (use-local-map terminal-edit-map)
  (setq major-mode 'terminal-edit-mode)
  (setq mode-name "Terminal Edit")
  (setq mode-line-modified (default-value 'mode-line-modified))
  (setq mode-line-process nil)
  (run-mode-hooks 'terminal-edit-mode-hook))

(defun te-edit ()
  "Start editing the terminal emulator buffer with ordinary Emacs commands."
  (interactive)
  (terminal-edit-mode)
  (force-mode-line-update)
  ;; Make mode line update.
  (if (eq (key-binding "\C-c\C-c") 'terminal-cease-edit)
      (message "Editing: Type C-c C-c to return to Terminal")
    (message "%s"
	     (substitute-command-keys
	       "Editing: Type \\[terminal-cease-edit] to return to Terminal"))))

(defun terminal-cease-edit ()
  "Finish editing message; switch back to Terminal proper."
  (interactive)

  ;;>> emulator will blow out if buffer isn't exactly te-width x te-height
  (let ((buffer-read-only nil))
    (widen)
    (let ((opoint (point-marker))
          (width te-width)
          (h (1- te-height)))
      (goto-char (point-min))
      (while (>= h 0)
        (let ((p (point)))
          (cond ((search-forward "\n" (+ p width) 'move)
                 (forward-char -1)
                 (insert-char ?\s (- width (- (point) p)))
                 (forward-char 1))
                ((eobp)
                 (insert-char ?\s (- width (- (point) p))))
                ((= (following-char) ?\n)
                 (forward-char 1))
                (t
                 (setq p (point))
                 (if (search-forward "\n" nil t)
                     (delete-region p (1- (point)))
                     (delete-region p (point-max))))))
        (if (= h 0)
            (if (not (eobp)) (delete-region (point) (point-max)))
            (if (eobp) (insert ?\n)))
        (setq h (1- h)))
      (goto-char opoint)
      (set-marker opoint nil nil)
      (setq te-saved-point (point))
      (setq te-redisplay-count 0)
      (setq te-more-count -1)))

  (setq mode-line-modified (default-value 'mode-line-modified))
  (use-local-map terminal-map)
  (setq major-mode 'terminal-mode)
  (setq mode-name "terminal")
  (setq mode-line-process '(":%s")))

;;;; more break hair

(defun te-more-break ()
  (te-set-more-count t)
  (make-local-variable 'te-more-old-point)
  (setq te-more-old-point (point))
  (make-local-variable 'te-more-old-local-map)
  (setq te-more-old-local-map (current-local-map))
  (use-local-map terminal-more-break-map)
  (make-local-variable 'te-more-old-filter)
  (setq te-more-old-filter (process-filter te-process))
  (make-local-variable 'te-more-old-mode-line-format)
  (setq te-more-old-mode-line-format mode-line-format
	mode-line-format (list "--   **MORE**  "
			       mode-line-buffer-identification
			       "%-"))
  (set-process-filter te-process
    (function (lambda (process string)
		(save-excursion
		  (set-buffer (process-buffer process))
		  (setq te-pending-output (nconc te-pending-output
						 (list string))))
		  (te-update-pending-output-display))))
  (te-update-pending-output-display)
  (if (eq (window-buffer (selected-window)) (current-buffer))
      (message "More break "))
  (or (eobp)
      (null terminal-more-break-insertion)
      (save-excursion
	(forward-char 1)
	(delete-region (point) (+ (point) te-width))
	(insert terminal-more-break-insertion)))
  (run-hooks 'terminal-more-break-hook)
  (sit-for 0) ;get display to update
  (throw 'te-process-output t))

(defun te-more-break-unwind ()
  (use-local-map te-more-old-local-map)
  (set-process-filter te-process te-more-old-filter)
  (goto-char te-more-old-point)
  (setq mode-line-format te-more-old-mode-line-format)
  (force-mode-line-update)
  (let ((buffer-read-only nil))
    (cond ((eobp))
	  (terminal-more-break-insertion
	   (forward-char 1)
	   (delete-region (point)
			  (+ (point) (length terminal-more-break-insertion)))
	   (insert-char ?\s te-width)
	   (goto-char te-more-old-point)))
    (setq te-more-old-point nil)
    (let ((te-more-count 259259))
      (te-newline)))
  ;(sit-for 0)
  (te-process-output t))

(defun te-set-more-count (newline)
  (let ((line (/ (- (point) (point-min)) (1+ te-width))))
    (if newline (setq line (1+ line)))
    (cond ((= line te-height)
	   (setq te-more-count te-height))
	  ;>>>> something is strange.  Investigate this!
	  ((= line (1- te-height))
	   (setq te-more-count te-height))
	  ((or (< line (/ te-height 2))
	       (> (- te-height line) 10))
	   ;; break at end of this page
	   (setq te-more-count (- te-height line)))
	  (t
	   ;; migrate back towards top (ie bottom) of screen.
	   (setq te-more-count (- te-height
				  (if (> te-height 10) 2 1)))))))


;;;; More or less straight-forward terminal escapes

;; ^j, meaning `newline' to non-display programs.
;; (Who would think of ever writing a system which doesn't understand
;;  display terminals natively?  Un*x:  The Operating System of the Future.)
(defun te-newline ()
  "Move down a line, optionally do more processing, perhaps wrap/scroll,
move to start of new line, clear to end of line."
  (end-of-line)
  (cond ((not terminal-more-processing))
	((< (setq te-more-count (1- te-more-count)) 0)
	 (te-set-more-count t))
	((eq te-more-count 0)
	 ;; this doesn't return
	 (te-more-break)))
  (if (eobp)
      (progn
	(delete-region (point-min) (+ (point-min) te-width))
	(goto-char (point-min))
	(if terminal-scrolling
	    (progn (delete-char 1)
		   (goto-char (point-max))
		   (insert ?\n))))
    (forward-char 1)
    (delete-region (point) (+ (point) te-width)))
  (insert-char ?\s te-width)
  (beginning-of-line)
  (te-set-window-start))

; ^p = x+32 y+32
(defun te-move-to-position ()
  ;; must offset by #o40 since cretinous unix won't send a 004 char through
  (let ((y (- (te-get-char) 32))
	(x (- (te-get-char) 32)))
    (if (or (> x te-width)
	    (> y te-height))
	()
      (goto-char (+ (point-min) x (* y (1+ te-width))))
      ;(te-set-window-start?)
      ))
  (setq te-more-count -1))



;; ^p c
(defun te-clear-rest-of-line ()
  (save-excursion
    (let ((n (- (point) (progn (end-of-line) (point)))))
      (delete-region (point) (+ (point) n))
      (insert-char ?\s (- n)))))


;; ^p C
(defun te-clear-rest-of-screen ()
  (save-excursion
    (te-clear-rest-of-line)
    (while (progn (end-of-line) (not (eobp)))
      (forward-char 1) (end-of-line)
      (delete-region (- (point) te-width) (point))
      (insert-char ?\s te-width))))


;; ^p ^l
(defun te-clear-screen ()
  ;; regenerate buffer to compensate for (nonexistent!!) bugs.
  (erase-buffer)
  (let ((i 0))
    (while (< i te-height)
      (setq i (1+ i))
      (insert-char ?\s te-width)
      (insert ?\n)))
  (delete-region (1- (point-max)) (point-max))
  (goto-char (point-min))
  (setq te-more-count -1))


;; ^p ^o count+32
(defun te-insert-lines ()
  (if (not (bolp))
      ();(error "fooI")
    (save-excursion
      (let* ((line (- te-height (/ (- (point) (point-min)) (1+ te-width)) -1))
	     (n (min (- (te-get-char) ?\s) line))
	     (i 0))
	(delete-region (- (point-max) (* n (1+ te-width))) (point-max))
	(if (eq (point) (point-max)) (insert ?\n))
	(while (< i n)
	  (setq i (1+ i))
	  (insert-char ?\s te-width)
	  (or (eq i line) (insert ?\n))))))
  (setq te-more-count -1))


;; ^p ^k count+32
(defun te-delete-lines ()
  (if (not (bolp))
      ();(error "fooD")
    (let* ((line (- te-height (/ (- (point) (point-min)) (1+ te-width)) -1))
	   (n (min (- (te-get-char) ?\s) line))
	   (i 0))
      (delete-region (point)
		     (min (+ (point) (* n (1+ te-width))) (point-max)))
      (save-excursion
	(goto-char (point-max))
	(while (< i n)
	  (setq i (1+ i))
	  (insert-char ?\s te-width)
	  (or (eq i line) (insert ?\n))))))
  (setq te-more-count -1))

;; ^p ^a
(defun te-beginning-of-line ()
  (beginning-of-line))

;; ^p ^b
(defun te-backward-char ()
  (if (not (bolp))
      (backward-char 1)))

;; ^p ^f
(defun te-forward-char ()
  (if (not (eolp))
      (forward-char 1)))


;; 0177
(defun te-delete ()
  (if (bolp)
      ()
    (delete-region (1- (point)) (point))
    (insert ?\s)
    (forward-char -1)))

;; ^p ^g
(defun te-beep ()
  (beep))


;; ^p _ count+32
(defun te-insert-spaces ()
  (let* ((p (point))
	 (n (min (- (te-get-char) 32)
		 (- (progn (end-of-line) (point)) p))))
    (if (<= n 0)
	nil
      (delete-char (- n))
      (goto-char p)
      (insert-char ?\s n))
    (goto-char p)))

;; ^p d count+32  (should be ^p ^d but cretinous un*x won't send ^d chars!!!)
(defun te-delete-char ()
  (let* ((p (point))
	 (n (min (- (te-get-char) 32)
		 (- (progn (end-of-line) (point)) p))))
    (if (<= n 0)
	nil
      (insert-char ?\s n)
      (goto-char p)
      (delete-char n))
    (goto-char p)))



;; disgusting unix-required excrement
;;  Are we living twenty years in the past yet?

(defun te-losing-unix ()
  nil)

;; ^i
(defun te-output-tab ()
  (let* ((p (point))
	 (x (- p (progn (beginning-of-line) (point))))
	 (l (min (- 8 (logand x 7))
		 (progn (end-of-line) (- (point) p)))))
    (goto-char (+ p l))))

;; ^p ^j
;; Handle the `do' or `nl' termcap capability.
;;>> I am not sure why this broken, obsolete, capability is here.
;;>> Perhaps it is for VIle.  No comment was made about why it
;;>> was added (in "Sun Dec  6 01:22:27 1987  Richard Stallman")
(defun te-down-vertically-or-scroll ()
  "Move down a line vertically, or scroll at bottom."
  (let ((column (current-column)))
    (end-of-line)
    (if (eobp)
	(progn
	  (delete-region (point-min) (+ (point-min) te-width))
	  (goto-char (point-min))
	  (delete-char 1)
	  (goto-char (point-max))
	  (insert ?\n)
	  (insert-char ?\s te-width)
	  (beginning-of-line))
      (forward-line 1))
    (move-to-column column))
  (te-set-window-start))

;; Also:
;;  ^m => beginning-of-line (for which it -should- be using ^p ^a, right?!!)
;;  ^g => te-beep (for which it should use ^p ^g)
;;  ^h => te-backward-char (for which it should use ^p ^b)



(defun te-filter (process string)
  (let* ((obuf (current-buffer)))
    ;; can't use save-excursion, as that preserves point, which we don't want
    (unwind-protect
	(progn
	  (set-buffer (process-buffer process))
	  (goto-char te-saved-point)
	  (and (bufferp te-log-buffer)
	       (if (null (buffer-name te-log-buffer))
		   ;; killed
		   (setq te-log-buffer nil)
		 (set-buffer te-log-buffer)
		 (goto-char (point-max))
		 (insert-before-markers string)
		 (set-buffer (process-buffer process))))
	  (setq te-pending-output (nconc te-pending-output (list string)))
	  (te-update-pending-output-display)
	  (te-process-output (eq (current-buffer)
				 (window-buffer (selected-window))))
	  (set-buffer (process-buffer process))
	  (setq te-saved-point (point)))
      (set-buffer obuf))))

;; (A version of the following comment which might be distractingly offensive
;; to some readers has been moved to term-nasty.el.)
;; unix lacks ITS-style tty control...
(defun te-process-output (preemptible)
  ;;>> There seems no good reason to ever disallow preemption
  (setq preemptible t)
  (catch 'te-process-output
    (let ((buffer-read-only nil)
	  (string nil) ostring start char (matchpos nil))
      (while (cdr te-pending-output)
	(setq ostring string
	      start (car te-pending-output)
	      string (car (cdr te-pending-output))
	      char (aref string start))
	(if (eq (setq start (1+ start)) (length string))
	    (progn (setq te-pending-output
			   (cons 0 (cdr (cdr te-pending-output)))
			 start 0
			 string (car (cdr te-pending-output)))
		   (te-update-pending-output-display))
	    (setcar te-pending-output start))
	(if (and (> char ?\037) (< char ?\377))
	    (cond ((eolp)
		   ;; unread char
		   (if (eq start 0)
		       (setq te-pending-output
			     (cons 0 (cons (make-string 1 char)
					   (cdr te-pending-output))))
		       (setcar te-pending-output (1- start)))
		   (te-newline))
		  ((null string)
		   (delete-char 1) (insert char)
		   (te-redisplay-if-necessary 1))
		  (t
		   (let ((end (or (and (eq ostring string) matchpos)
				  (setq matchpos (string-match
						   "[\000-\037\177-\377]"
						   string start))
				  (length string))))
		     (delete-char 1) (insert char)
		     (setq char (point)) (end-of-line)
		     (setq end (min end (+ start (- (point) char))))
		     (goto-char char)
		     (if (eq end matchpos) (setq matchpos nil))
		     (delete-region (point) (+ (point) (- end start)))
		     (insert (if (and (eq start 0)
				      (eq end (length string)))
				 string
			         (substring string start end)))
		     (if (eq end (length string))
			 (setq te-pending-output
			       (cons 0 (cdr (cdr te-pending-output))))
		         (setcar te-pending-output end))
		     (te-redisplay-if-necessary (1+ (- end start))))))
	  ;; I suppose if I split the guts of this out into a separate
	  ;;  function we could trivially emulate different terminals
	  ;; Who cares in any case?  (Apart from stupid losers using rlogin)
	  (funcall
	    (if (eq char ?\^p)
	        (or (cdr (assq (te-get-char)
			       '((?= . te-move-to-position)
				 (?c . te-clear-rest-of-line)
				 (?C . te-clear-rest-of-screen)
				 (?\C-o . te-insert-lines)
				 (?\C-k . te-delete-lines)
				 ;; not necessary, but help sometimes.
				 (?\C-a . te-beginning-of-line)
				 (?\C-b . te-backward-char)
				 ;; should be C-d, but un*x
				 ;;  pty's won't send \004 through!
                                 ;; Can you believe this?
				 (?d . te-delete-char)
				 (?_ . te-insert-spaces)
				 ;; random
				 (?\C-f . te-forward-char)
				 (?\C-g . te-beep)
				 (?\C-j . te-down-vertically-or-scroll)
				 (?\C-l . te-clear-screen)
				 )))
		    'te-losing-unix)
	        (or (cdr (assq char
			       '((?\C-j . te-newline)
				 (?\177 . te-delete)
				 ;; Did I ask to be sent these characters?
				 ;; I don't remember doing so, either.
				 ;; (Perhaps some operating system or
				 ;; other is completely incompetent...)
				 (?\C-m . te-beginning-of-line)
				 (?\C-g . te-beep)
				 (?\C-h . te-backward-char)
				 (?\C-i . te-output-tab))))
		    'te-losing-unix)))
	  (te-redisplay-if-necessary 1))
	(and preemptible
	     (input-pending-p)
	     ;; preemptible output!  Oh my!!
	     (throw 'te-process-output t)))))
  ;; We must update window-point in every window displaying our buffer
  (walk-windows (lambda (w)
		  (when (and (not (eq w (selected-window)))
			     (eq (window-buffer w) (current-buffer)))
		    (set-window-point w (point))))))

(defun te-get-char ()
  (if (cdr te-pending-output)
      (let ((start (car te-pending-output))
	    (string (car (cdr te-pending-output))))
	(prog1 (aref string start)
	  (if (eq (setq start (1+ start)) (length string))
	      (setq te-pending-output (cons 0 (cdr (cdr te-pending-output))))
	      (setcar te-pending-output start))))
    (catch 'char
      (let ((filter (process-filter te-process)))
	(unwind-protect
	    (progn
	      (set-process-filter te-process
				  (function (lambda (p s)
                                    (or (eq (length s) 1)
                                        (setq te-pending-output (list 1 s)))
                                    (throw 'char (aref s 0)))))
	      (accept-process-output te-process))
	  (set-process-filter te-process filter))))))


(defun te-redisplay-if-necessary (length)
  (and (<= (setq te-redisplay-count (- te-redisplay-count length)) 0)
       (eq (current-buffer) (window-buffer (selected-window)))
       (waiting-for-user-input-p)
       (progn (te-update-pending-output-display)
	      (sit-for 0)
	      (setq te-redisplay-count terminal-redisplay-interval))))

(defun te-update-pending-output-display ()
  (if (null (cdr te-pending-output))
      (setq te-pending-output-info "")
    (let ((length (te-pending-output-length)))
      (if (< length 1500)
	  (setq te-pending-output-info "")
	(setq te-pending-output-info (format "(%dK chars output pending) "
					     (/ (+ length 512) 1024))))))
  (force-mode-line-update))


(defun te-sentinel (process message)
  (cond ((eq (process-status process) 'run))
	((null (buffer-name (process-buffer process)))) ;deleted
	(t (let ((b (current-buffer)))
	     (save-excursion
	       (set-buffer (process-buffer process))
	       (setq buffer-read-only nil)
	       (fundamental-mode)
	       (goto-char (point-max))
	       (delete-blank-lines)
	       (delete-horizontal-space)
	       (insert "\n*******\n" message "*******\n"))
	     (if (and (eq b (process-buffer process))
		      (waiting-for-user-input-p))
		 (progn (goto-char (point-max))
			(recenter -1)))))))

(defvar te-stty-string "stty -nl erase '^?' kill '^u' intr '^c' echo pass8"
  "Shell command to set terminal modes for terminal emulator.")
;; This used to have `new' in it, but that loses outside BSD
;; and it's apparently not needed in BSD.

(defcustom explicit-shell-file-name nil
  "If non-nil, is file name to use for explicitly requested inferior shell."
  :type '(choice (const :tag "None" nil)
		 file)
  :group 'terminal)

;;;###autoload
(defun terminal-emulator (buffer program args &optional width height)
  "Under a display-terminal emulator in BUFFER, run PROGRAM on arguments ARGS.
ARGS is a list of argument-strings.  Remaining arguments are WIDTH and HEIGHT.
BUFFER's contents are made an image of the display generated by that program,
and any input typed when BUFFER is the current Emacs buffer is sent to that
program as keyboard input.

Interactively, BUFFER defaults to \"*terminal*\" and PROGRAM and ARGS
are parsed from an input-string using your usual shell.
WIDTH and HEIGHT are determined from the size of the current window
-- WIDTH will be one less than the window's width, HEIGHT will be its height.

To switch buffers and leave the emulator, or to give commands
to the emulator itself (as opposed to the program running under it),
type Control-^.  The following character is an emulator command.
Type Control-^ twice to send it to the subprogram.
This escape character may be changed using the variable `terminal-escape-char'.

`Meta' characters may not currently be sent through the terminal emulator.

Here is a list of some of the variables which control the behavior
of the emulator -- see their documentation for more information:
terminal-escape-char, terminal-scrolling, terminal-more-processing,
terminal-redisplay-interval.

This function calls the value of terminal-mode-hook if that exists
and is non-nil after the terminal buffer has been set up and the
subprocess started."
  (interactive
    (cons (save-excursion
	    (set-buffer (get-buffer-create "*terminal*"))
	    (buffer-name (if (or (not (boundp 'te-process))
				 (null te-process)
				 (not (eq (process-status te-process)
					  'run)))
			     (current-buffer)
			   (generate-new-buffer "*terminal*"))))
	  (append
	    (let* ((default-s
		     ;; Default shell is same thing M-x shell uses.
		     (or explicit-shell-file-name
			 (getenv "ESHELL")
			 (getenv "SHELL")
			 "/bin/sh"))
		   (s (read-string
		       (format "Run program in emulator (default %s): "
			       default-s))))
	      (if (equal s "")
		  (list default-s '())
		(te-parse-program-and-args s))))))
  (switch-to-buffer buffer)
  (if (null width) (setq width (- (window-width (selected-window)) 1)))
  (if (null height) (setq height (- (window-height (selected-window)) 1)))
  (terminal-mode)
  (setq te-width width te-height height)
  (setq te-terminal-name (concat te-terminal-name-prefix
				 (number-to-string te-width)
				 (number-to-string te-height)))
  (setq mode-line-buffer-identification
	(list (format "Emacs terminal %dx%d: %%b  " te-width te-height)
	      'te-pending-output-info))
  (let ((buffer-read-only nil))
    (te-clear-screen))
  (let (process)
    (while (setq process (get-buffer-process (current-buffer)))
      (if (y-or-n-p (format "Kill process %s? " (process-name process)))
	  (delete-process process)
	(error "Process %s not killed" (process-name process)))))
  (condition-case err
      (let ((process-environment
	     (cons (concat "TERM=" te-terminal-name)
		   (cons (concat "TERMCAP=" (te-create-termcap))
			 (cons (concat "TERMINFO=" (te-create-terminfo))
			       process-environment)))))
	(setq te-process
	      (start-process "terminal-emulator" (current-buffer)
			     "/bin/sh" "-c"
			     ;; Yuck!!! Start a shell to set some terminal
			     ;; control characteristics.  Then start the
			     ;; "env" program to setup the terminal type
			     ;; Then finally start the program we wanted.
			     (format "%s; exec %s"
				     te-stty-string
				     (mapconcat 'te-quote-arg-for-sh
						(cons program args) " "))))
	(set-process-filter te-process 'te-filter)
	(set-process-sentinel te-process 'te-sentinel))
    (error (fundamental-mode)
	   (signal (car err) (cdr err))))
  (setq inhibit-quit t)			;sport death
  (use-local-map terminal-map)
  (run-hooks 'terminal-mode-hook)
  (message "Entering Emacs terminal-emulator...  Type %s %s for help"
	   (single-key-description terminal-escape-char)
	   (mapconcat 'single-key-description
		      (where-is-internal 'te-escape-help terminal-escape-map t)
		      " ")))


(defun te-parse-program-and-args (s)
  (cond ((string-match "\\`\\([-a-zA-Z0-9+=_.@/:]+[ \t]*\\)+\\'" s)
	 (let ((l ()) (p 0))
	   (while p
	     (setq l (cons (if (string-match
				"\\([-a-zA-Z0-9+=_.@/:]+\\)\\([ \t]+\\)*"
				s p)
			       (prog1 (substring s p (match-end 1))
				 (setq p (match-end 0))
				 (if (eq p (length s)) (setq p nil)))
			       (prog1 (substring s p)
				 (setq p nil)))
			   l)))
	   (setq l (nreverse l))
	   (list (car l) (cdr l))))
	((and (string-match "[ \t]" s) (not (file-exists-p s)))
	 (list shell-file-name (list "-c" (concat "exec " s))))
	(t (list s ()))))

(put 'terminal-mode 'mode-class 'special)
;; This is only separated out from function terminal-emulator
;; to keep the latter a little more manageable.
(defun terminal-mode ()
  "Set up variables for use with the terminal-emulator.
One should not call this -- it is an internal function
of the terminal-emulator"
  (kill-all-local-variables)
  (buffer-disable-undo (current-buffer))
  (setq major-mode 'terminal-mode)
  (setq mode-name "terminal")
; (make-local-variable 'Helper-return-blurb)
; (setq Helper-return-blurb "return to terminal simulator")
  (setq mode-line-process '(":%s"))
  (setq buffer-read-only t)
  (setq truncate-lines t)
  (make-local-variable 'terminal-escape-char)
  (setq terminal-escape-char (default-value 'terminal-escape-char))
  (make-local-variable 'terminal-scrolling)
  (setq terminal-scrolling (default-value 'terminal-scrolling))
  (make-local-variable 'terminal-more-processing)
  (setq terminal-more-processing (default-value 'terminal-more-processing))
  (make-local-variable 'terminal-redisplay-interval)
  (setq terminal-redisplay-interval (default-value 'terminal-redisplay-interval))
  (make-local-variable 'te-width)
  (make-local-variable 'te-height)
  (make-local-variable 'te-process)
  (make-local-variable 'te-pending-output)
  (setq te-pending-output (list 0))
  (make-local-variable 'te-saved-point)
  (setq te-saved-point (point-min))
  (make-local-variable 'te-pending-output-info) ;for the mode line
  (setq te-pending-output-info "")
  (make-local-variable 'inhibit-quit)
  ;(setq inhibit-quit t)
  (make-local-variable 'te-log-buffer)
  (setq te-log-buffer nil)
  (make-local-variable 'te-more-count)
  (setq te-more-count -1)
  (make-local-variable 'te-redisplay-count)
  (setq te-redisplay-count terminal-redisplay-interval)
  ;(use-local-map terminal-mode-map)
  ;; terminal-mode-hook is called above in function terminal-emulator
  )

;;;; what a complete loss

(defun te-quote-arg-for-sh (string)
  (cond ((string-match "\\`[-a-zA-Z0-9+=_.@/:]+\\'"
		       string)
	 string)
	((not (string-match "[$]" string))
	 ;; "[\"\\]" are special to sh and the lisp reader in the same way
	 (prin1-to-string string))
	(t
	 (let ((harder "")
	       (start 0)
	       (end 0))
	   (while (cond ((>= start (length string))
			 nil)
			;; this is the set of chars magic with "..." in `sh'
			((setq end (string-match "[\"\\$]"
						 string start))
			 t)
			(t (setq harder (concat harder
						(substring string start)))
			   nil))
	     (setq harder (concat harder (substring string start end)
                                  ;; Can't use ?\\ since `concat'
                                  ;; unfortunately does prin1-to-string
                                  ;; on fixna.  Amazing.
				  "\\"
				  (substring string
					     end
					     (1+ end)))
		   start (1+ end)))
	   (concat "\"" harder "\"")))))

(defun te-create-terminfo ()
  "Create and compile a terminfo entry for the virtual terminal. This is kept
in the directory specified by `te-terminfo-directory'."
  (when (and system-uses-terminfo
	     (not (file-exists-p (concat te-terminfo-directory
					 (substring te-terminal-name-prefix 0 1)
					 "/" te-terminal-name))))
    (let ( (terminfo
	    (concat
	     ;; The first newline avoids trouble with ncurses.
	     (format "%s,\n\tmir, xon,cols#%d, lines#%d,"
		     te-terminal-name te-width te-height)
	     "bel=^P^G, clear=^P\\f, cr=^P^A, cub1=^P^B, cud1=^P\\n,"
	     "cuf1=^P^F, cup=^P=%p1%'\\s'%+%c%p2%'\\s'%+%c,"
	     "dch=^Pd%p1%'\\s'%+%c, dch1=^Pd!, dl=^P^K%p1%'\\s'%+%c,"
	     "dl1=^P^K!, ed=^PC, el=^Pc, home=^P=\\s\\s,"
	     "ich=^P_%p1%'\\s'%+%c, ich1=^P_!, il=^P^O%p1%'\\s'%+%c,"
	     ;; The last newline avoids trouble with ncurses.
	     "il1=^P^O!, ind=^P\\n, nel=\\n,\n"))
	   ;; This is the desired name for the source file.
	   (file-name (concat te-terminfo-directory te-terminal-name ".tif")) )
      (make-directory te-terminfo-directory t)
      (let ((temp-file
	     (make-temp-file (expand-file-name "tif" te-terminfo-directory))))
	;; Store the source file under a random temp name.
	(with-temp-file temp-file
	  (insert terminfo))
	;; Rename it to the desired name.
	;; We use this roundabout approach
	;; to avoid any risk of writing a name that
	;; was michievouslyt set up as a symlink.
	(rename-file temp-file file-name))
      ;; Now compile that source to make the binary that the
      ;; programs actually use.
      (let ((process-environment
	     (cons (concat "TERMINFO="
			   (directory-file-name te-terminfo-directory))
		   process-environment)))
	(set-process-sentinel (start-process "tic" nil "tic" file-name)
			      'te-tic-sentinel))))
    (directory-file-name te-terminfo-directory))

(defun te-create-termcap ()
  "Create a termcap entry for the virtual terminal"
  ;; Because of Unix Brain Death(tm), we can't change
  ;;  the terminal type of a running process, and so
  ;;  terminal size and scrollability are wired-down
  ;;  at this point.  ("Detach?  What's that?")
  (concat (format "%s:co#%d:li#%d:%s"
		  ;; Sigh.  These can't be dynamically changed.
		  te-terminal-name te-width te-height (if terminal-scrolling
					 "" "ns:"))
	  ;;-- Basic things
	  ;; cursor-motion, bol, forward/backward char
	  "cm=^p=%+ %+ :cr=^p^a:le=^p^b:nd=^p^f:"
	  ;; newline, clear eof/eof, audible bell
	  "nw=^j:ce=^pc:cd=^pC:cl=^p^l:bl=^p^g:"
	  ;; insert/delete char/line
	  "IC=^p_%+ :DC=^pd%+ :AL=^p^o%+ :DL=^p^k%+ :"
	  ;;-- Not-widely-known (ie nonstandard) flags, which mean
	  ;; o writing in the last column of the last line
	  ;;   doesn't cause idiotic scrolling, and
	  ;; o don't use idiotische c-s/c-q sogenannte
	  ;;   ``flow control'' auf keinen Fall.
	  "LP:NF:"
	  ;;-- For stupid or obsolete programs
	  "ic=^p_!:dc=^pd!:al=^p^o!:dl=^p^k!:ho=^p=  :"
	  ;;-- For disgusting programs.
	  ;; (VI? What losers need these, I wonder?)
	  "im=:ei=:dm=:ed=:mi:do=^p^j:nl=^p^j:bs:")
)

(defun te-tic-sentinel (proc state-change)
  "If tic has finished, delete the .tif file"
  (if (equal state-change "finished
")
      (delete-file (concat te-terminfo-directory te-terminal-name ".tif"))))

(provide 'terminal)

;; arch-tag: 0ae1d7d7-90ef-4566-a531-6e7ff8c79b2f
;;; terminal.el ends here