?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Move less-4/ to less/. No need for versioned directories.
[dragonfly.git] / contrib / less / command.c
blob7012458596306315d9ef368f7cf92f1f156de6df
1 /*
2 * Copyright (C) 1984-2007 Mark Nudelman
3 *
4 * You may distribute under the terms of either the GNU General Public
5 * License or the Less License, as specified in the README file.
6 *
7 * For more information about less, or for information on how to
8 * contact the author, see the README file.
9 */
10
11
12 /*
13 * User-level command processor.
14 */
15
16 #include "less.h"
17 #if MSDOS_COMPILER==WIN32C
18 #include <windows.h>
19 #endif
20 #include "position.h"
21 #include "option.h"
22 #include "cmd.h"
23
24 extern int erase_char, erase2_char, kill_char;
25 extern int sigs;
26 extern int quit_if_one_screen;
27 extern int squished;
28 extern int hit_eof;
29 extern int sc_width;
30 extern int sc_height;
31 extern int swindow;
32 extern int jump_sline;
33 extern int quitting;
34 extern int wscroll;
35 extern int top_scroll;
36 extern int ignore_eoi;
37 extern int secure;
38 extern int hshift;
39 extern int show_attn;
40 extern char *every_first_cmd;
41 extern char *curr_altfilename;
42 extern char version[];
43 extern struct scrpos initial_scrpos;
44 extern IFILE curr_ifile;
45 extern void constant *ml_search;
46 extern void constant *ml_examine;
47 #if SHELL_ESCAPE || PIPEC
48 extern void constant *ml_shell;
49 #endif
50 #if EDITOR
51 extern char *editor;
52 extern char *editproto;
53 #endif
54 extern int screen_trashed; /* The screen has been overwritten */
55 extern int shift_count;
56 extern int oldbot;
57 extern int forw_prompt;
58
59 static char ungot[UNGOT_SIZE];
60 static char *ungotp = NULL;
61 #if SHELL_ESCAPE
62 static char *shellcmd = NULL; /* For holding last shell command for "!!" */
63 #endif
64 static int mca; /* The multicharacter command (action) */
65 static int search_type; /* The previous type of search */
66 static LINENUM number; /* The number typed by the user */
67 static long fraction; /* The fractional part of the number */
68 static char optchar;
69 static int optflag;
70 static int optgetname;
71 static POSITION bottompos;
72 static int save_hshift;
73 #if PIPEC
74 static char pipec;
75 #endif
76
77 static void multi_search();
78
79 /*
80 * Move the cursor to start of prompt line before executing a command.
81 * This looks nicer if the command takes a long time before
82 * updating the screen.
83 */
84 static void
85 cmd_exec()
86 {
87 clear_attn();
88 clear_bot();
89 flush();
90 }
91
92 /*
93 * Set up the display to start a new multi-character command.
94 */
95 static void
96 start_mca(action, prompt, mlist, cmdflags)
97 int action;
98 char *prompt;
99 void *mlist;
100 int cmdflags;
101 {
102 mca = action;
103 clear_bot();
104 clear_cmd();
105 cmd_putstr(prompt);
106 set_mlist(mlist, cmdflags);
107 }
108
109 public int
110 in_mca()
111 {
112 return (mca != 0 && mca != A_PREFIX);
113 }
114
115 /*
116 * Set up the display to start a new search command.
117 */
118 static void
119 mca_search()
120 {
121 if (search_type & SRCH_FORW)
122 mca = A_F_SEARCH;
123 else
124 mca = A_B_SEARCH;
125
126 clear_bot();
127 clear_cmd();
128
129 if (search_type & SRCH_NO_MATCH)
130 cmd_putstr("Non-match ");
131 if (search_type & SRCH_FIRST_FILE)
132 cmd_putstr("First-file ");
133 if (search_type & SRCH_PAST_EOF)
134 cmd_putstr("EOF-ignore ");
135 if (search_type & SRCH_NO_MOVE)
136 cmd_putstr("Keep-pos ");
137 if (search_type & SRCH_NO_REGEX)
138 cmd_putstr("Regex-off ");
139
140 if (search_type & SRCH_FORW)
141 cmd_putstr("/");
142 else
143 cmd_putstr("?");
144 set_mlist(ml_search, 0);
145 }
146
147 /*
148 * Set up the display to start a new toggle-option command.
149 */
150 static void
151 mca_opt_toggle()
152 {
153 int no_prompt;
154 int flag;
155 char *dash;
156
157 no_prompt = (optflag & OPT_NO_PROMPT);
158 flag = (optflag & ~OPT_NO_PROMPT);
159 dash = (flag == OPT_NO_TOGGLE) ? "_" : "-";
160
161 mca = A_OPT_TOGGLE;
162 clear_bot();
163 clear_cmd();
164 cmd_putstr(dash);
165 if (optgetname)
166 cmd_putstr(dash);
167 if (no_prompt)
168 cmd_putstr("(P)");
169 switch (flag)
170 {
171 case OPT_UNSET:
172 cmd_putstr("+");
173 break;
174 case OPT_SET:
175 cmd_putstr("!");
176 break;
177 }
178 set_mlist(NULL, 0);
179 }
180
181 /*
182 * Execute a multicharacter command.
183 */
184 static void
185 exec_mca()
186 {
187 register char *cbuf;
188
189 cmd_exec();
190 cbuf = get_cmdbuf();
191
192 switch (mca)
193 {
194 case A_F_SEARCH:
195 case A_B_SEARCH:
196 multi_search(cbuf, (int) number);
197 break;
198 case A_FIRSTCMD:
199 /*
200 * Skip leading spaces or + signs in the string.
201 */
202 while (*cbuf == '+' || *cbuf == ' ')
203 cbuf++;
204 if (every_first_cmd != NULL)
205 free(every_first_cmd);
206 if (*cbuf == '\0')
207 every_first_cmd = NULL;
208 else
209 every_first_cmd = save(cbuf);
210 break;
211 case A_OPT_TOGGLE:
212 toggle_option(optchar, cbuf, optflag);
213 optchar = '\0';
214 break;
215 case A_F_BRACKET:
216 match_brac(cbuf[0], cbuf[1], 1, (int) number);
217 break;
218 case A_B_BRACKET:
219 match_brac(cbuf[1], cbuf[0], 0, (int) number);
220 break;
221 #if EXAMINE
222 case A_EXAMINE:
223 if (secure)
224 break;
225 edit_list(cbuf);
226 #if TAGS
227 /* If tag structure is loaded then clean it up. */
228 cleantags();
229 #endif
230 break;
231 #endif
232 #if SHELL_ESCAPE
233 case A_SHELL:
234 /*
235 * !! just uses whatever is in shellcmd.
236 * Otherwise, copy cmdbuf to shellcmd,
237 * expanding any special characters ("%" or "#").
238 */
239 if (*cbuf != '!')
240 {
241 if (shellcmd != NULL)
242 free(shellcmd);
243 shellcmd = fexpand(cbuf);
244 }
245
246 if (secure)
247 break;
248 if (shellcmd == NULL)
249 lsystem("", "!done");
250 else
251 lsystem(shellcmd, "!done");
252 break;
253 #endif
254 #if PIPEC
255 case A_PIPE:
256 if (secure)
257 break;
258 (void) pipe_mark(pipec, cbuf);
259 error("|done", NULL_PARG);
260 break;
261 #endif
262 }
263 }
264
265 /*
266 * Add a character to a multi-character command.
267 */
268 static int
269 mca_char(c)
270 int c;
271 {
272 char *p;
273 int flag;
274 char buf[3];
275 PARG parg;
276
277 switch (mca)
278 {
279 case 0:
280 /*
281 * Not in a multicharacter command.
282 */
283 return (NO_MCA);
284
285 case A_PREFIX:
286 /*
287 * In the prefix of a command.
288 * This not considered a multichar command
289 * (even tho it uses cmdbuf, etc.).
290 * It is handled in the commands() switch.
291 */
292 return (NO_MCA);
293
294 case A_DIGIT:
295 /*
296 * Entering digits of a number.
297 * Terminated by a non-digit.
298 */
299 if (!((c >= '0' && c <= '9') || c == '.') &&
300 editchar(c, EC_PEEK|EC_NOHISTORY|EC_NOCOMPLETE|EC_NORIGHTLEFT) == A_INVALID)
301 {
302 /*
303 * Not part of the number.
304 * Treat as a normal command character.
305 */
306 number = cmd_int(&fraction);
307 mca = 0;
308 cmd_accept();
309 return (NO_MCA);
310 }
311 break;
312
313 case A_OPT_TOGGLE:
314 /*
315 * Special case for the TOGGLE_OPTION command.
316 * If the option letter which was entered is a
317 * single-char option, execute the command immediately,
318 * so user doesn't have to hit RETURN.
319 * If the first char is + or -, this indicates
320 * OPT_UNSET or OPT_SET respectively, instead of OPT_TOGGLE.
321 * "--" begins inputting a long option name.
322 */
323 if (optchar == '\0' && len_cmdbuf() == 0)
324 {
325 flag = (optflag & ~OPT_NO_PROMPT);
326 if (flag == OPT_NO_TOGGLE)
327 {
328 switch (c)
329 {
330 case '_':
331 /* "__" = long option name. */
332 optgetname = TRUE;
333 mca_opt_toggle();
334 return (MCA_MORE);
335 }
336 } else
337 {
338 switch (c)
339 {
340 case '+':
341 /* "-+" = UNSET. */
342 optflag = (flag == OPT_UNSET) ?
343 OPT_TOGGLE : OPT_UNSET;
344 mca_opt_toggle();
345 return (MCA_MORE);
346 case '!':
347 /* "-!" = SET */
348 optflag = (flag == OPT_SET) ?
349 OPT_TOGGLE : OPT_SET;
350 mca_opt_toggle();
351 return (MCA_MORE);
352 case CONTROL('P'):
353 optflag ^= OPT_NO_PROMPT;
354 mca_opt_toggle();
355 return (MCA_MORE);
356 case '-':
357 /* "--" = long option name. */
358 optgetname = TRUE;
359 mca_opt_toggle();
360 return (MCA_MORE);
361 }
362 }
363 }
364 if (optgetname)
365 {
366 /*
367 * We're getting a long option name.
368 * See if we've matched an option name yet.
369 * If so, display the complete name and stop
370 * accepting chars until user hits RETURN.
371 */
372 struct loption *o;
373 char *oname;
374 int lc;
375
376 if (c == '\n' || c == '\r')
377 {
378 /*
379 * When the user hits RETURN, make sure
380 * we've matched an option name, then
381 * pretend he just entered the equivalent
382 * option letter.
383 */
384 if (optchar == '\0')
385 {
386 parg.p_string = get_cmdbuf();
387 error("There is no --%s option", &parg);
388 return (MCA_DONE);
389 }
390 optgetname = FALSE;
391 cmd_reset();
392 c = optchar;
393 } else
394 {
395 if (optchar != '\0')
396 {
397 /*
398 * Already have a match for the name.
399 * Don't accept anything but erase/kill.
400 */
401 if (c == erase_char ||
402 c == erase2_char ||
403 c == kill_char)
404 return (MCA_DONE);
405 return (MCA_MORE);
406 }
407 /*
408 * Add char to cmd buffer and try to match
409 * the option name.
410 */
411 if (cmd_char(c) == CC_QUIT)
412 return (MCA_DONE);
413 p = get_cmdbuf();
414 lc = ASCII_IS_LOWER(p[0]);
415 o = findopt_name(&p, &oname, NULL);
416 if (o != NULL)
417 {
418 /*
419 * Got a match.
420 * Remember the option letter and
421 * display the full option name.
422 */
423 optchar = o->oletter;
424 if (!lc && ASCII_IS_LOWER(optchar))
425 optchar = ASCII_TO_UPPER(optchar);
426 cmd_reset();
427 mca_opt_toggle();
428 for (p = oname; *p != '\0'; p++)
429 {
430 c = *p;
431 if (!lc && ASCII_IS_LOWER(c))
432 c = ASCII_TO_UPPER(c);
433 if (cmd_char(c) != CC_OK)
434 return (MCA_DONE);
435 }
436 }
437 return (MCA_MORE);
438 }
439 } else
440 {
441 if (c == erase_char || c == erase2_char || c == kill_char)
442 break;
443 if (optchar != '\0')
444 /* We already have the option letter. */
445 break;
446 }
447
448 optchar = c;
449 if ((optflag & ~OPT_NO_PROMPT) != OPT_TOGGLE ||
450 single_char_option(c))
451 {
452 toggle_option(c, "", optflag);
453 return (MCA_DONE);
454 }
455 /*
456 * Display a prompt appropriate for the option letter.
457 */
458 if ((p = opt_prompt(c)) == NULL)
459 {
460 buf[0] = '-';
461 buf[1] = c;
462 buf[2] = '\0';
463 p = buf;
464 }
465 start_mca(A_OPT_TOGGLE, p, (void*)NULL, 0);
466 return (MCA_MORE);
467
468 case A_F_SEARCH:
469 case A_B_SEARCH:
470 /*
471 * Special case for search commands.
472 * Certain characters as the first char of
473 * the pattern have special meaning:
474 * ! Toggle the NO_MATCH flag
475 * * Toggle the PAST_EOF flag
476 * @ Toggle the FIRST_FILE flag
477 */
478 if (len_cmdbuf() > 0)
479 /*
480 * Only works for the first char of the pattern.
481 */
482 break;
483
484 flag = 0;
485 switch (c)
486 {
487 case CONTROL('E'): /* ignore END of file */
488 case '*':
489 flag = SRCH_PAST_EOF;
490 break;
491 case CONTROL('F'): /* FIRST file */
492 case '@':
493 flag = SRCH_FIRST_FILE;
494 break;
495 case CONTROL('K'): /* KEEP position */
496 flag = SRCH_NO_MOVE;
497 break;
498 case CONTROL('R'): /* Don't use REGULAR EXPRESSIONS */
499 flag = SRCH_NO_REGEX;
500 break;
501 case CONTROL('N'): /* NOT match */
502 case '!':
503 flag = SRCH_NO_MATCH;
504 break;
505 }
506 if (flag != 0)
507 {
508 search_type ^= flag;
509 mca_search();
510 return (MCA_MORE);
511 }
512 break;
513 }
514
515 /*
516 * Any other multicharacter command
517 * is terminated by a newline.
518 */
519 if (c == '\n' || c == '\r')
520 {
521 /*
522 * Execute the command.
523 */
524 exec_mca();
525 return (MCA_DONE);
526 }
527
528 /*
529 * Append the char to the command buffer.
530 */
531 if (cmd_char(c) == CC_QUIT)
532 /*
533 * Abort the multi-char command.
534 */
535 return (MCA_DONE);
536
537 if ((mca == A_F_BRACKET || mca == A_B_BRACKET) && len_cmdbuf() >= 2)
538 {
539 /*
540 * Special case for the bracket-matching commands.
541 * Execute the command after getting exactly two
542 * characters from the user.
543 */
544 exec_mca();
545 return (MCA_DONE);
546 }
547
548 /*
549 * Need another character.
550 */
551 return (MCA_MORE);
552 }
553
554 /*
555 * Discard any buffered file data.
556 */
557 static void
558 clear_buffers()
559 {
560 if (!(ch_getflags() & CH_CANSEEK))
561 return;
562 ch_flush();
563 clr_linenum();
564 #if HILITE_SEARCH
565 clr_hilite();
566 #endif
567 }
568
569 /*
570 * Make sure the screen is displayed.
571 */
572 static void
573 make_display()
574 {
575 /*
576 * If nothing is displayed yet, display starting from initial_scrpos.
577 */
578 if (empty_screen())
579 {
580 if (initial_scrpos.pos == NULL_POSITION)
581 /*
582 * {{ Maybe this should be:
583 * jump_loc(ch_zero(), jump_sline);
584 * but this behavior seems rather unexpected
585 * on the first screen. }}
586 */
587 jump_loc(ch_zero(), 1);
588 else
589 jump_loc(initial_scrpos.pos, initial_scrpos.ln);
590 } else if (screen_trashed)
591 {
592 int save_top_scroll = top_scroll;
593 int save_ignore_eoi = ignore_eoi;
594 top_scroll = 1;
595 ignore_eoi = 0;
596 if (screen_trashed == 2)
597 {
598 /* Special case used by ignore_eoi: re-open the input file
599 * and jump to the end of the file. */
600 reopen_curr_ifile();
601 jump_forw();
602 }
603 repaint();
604 top_scroll = save_top_scroll;
605 ignore_eoi = save_ignore_eoi;
606 }
607 }
608
609 /*
610 * Display the appropriate prompt.
611 */
612 static void
613 prompt()
614 {
615 register char *p;
616
617 if (ungotp != NULL && ungotp > ungot)
618 {
619 /*
620 * No prompt necessary if commands are from
621 * ungotten chars rather than from the user.
622 */
623 return;
624 }
625
626 /*
627 * Make sure the screen is displayed.
628 */
629 make_display();
630 bottompos = position(BOTTOM_PLUS_ONE);
631
632 /*
633 * If we've hit EOF on the last file, and the -E flag is set
634 * (or -F is set and this is the first prompt), then quit.
635 * {{ Relying on "first prompt" to detect a single-screen file
636 * fails if +G is used, for example. }}
637 */
638 if ((get_quit_at_eof() == OPT_ONPLUS || quit_if_one_screen) &&
639 hit_eof && !(ch_getflags() & CH_HELPFILE) &&
640 next_ifile(curr_ifile) == NULL_IFILE)
641 quit(QUIT_OK);
642 quit_if_one_screen = FALSE;
643 #if 0 /* This doesn't work well because some "te"s clear the screen. */
644 /*
645 * If the -e flag is set and we've hit EOF on the last file,
646 * and the file is squished (shorter than the screen), quit.
647 */
648 if (get_quit_at_eof() && squished &&
649 next_ifile(curr_ifile) == NULL_IFILE)
650 quit(QUIT_OK);
651 #endif
652
653 #if MSDOS_COMPILER==WIN32C
654 /*
655 * In Win32, display the file name in the window title.
656 */
657 if (!(ch_getflags() & CH_HELPFILE))
658 SetConsoleTitle(pr_expand("Less?f - %f.", 0));
659 #endif
660 /*
661 * Select the proper prompt and display it.
662 */
663 /*
664 * If the previous action was a forward movement,
665 * don't clear the bottom line of the display;
666 * just print the prompt since the forward movement guarantees
667 * that we're in the right position to display the prompt.
668 * Clearing the line could cause a problem: for example, if the last
669 * line displayed ended at the right screen edge without a newline,
670 * then clearing would clear the last displayed line rather than
671 * the prompt line.
672 */
673 if (!forw_prompt)
674 clear_bot();
675 clear_cmd();
676 forw_prompt = 0;
677 p = pr_string();
678 if (p == NULL || *p == '\0')
679 putchr(':');
680 else
681 {
682 at_enter(AT_STANDOUT);
683 putstr(p);
684 at_exit();
685 }
686 clear_eol();
687 }
688
689 /*
690 * Display the less version message.
691 */
692 public void
693 dispversion()
694 {
695 PARG parg;
696
697 parg.p_string = version;
698 error("less %s", &parg);
699 }
700
701 /*
702 * Get command character.
703 * The character normally comes from the keyboard,
704 * but may come from ungotten characters
705 * (characters previously given to ungetcc or ungetsc).
706 */
707 public int
708 getcc()
709 {
710 if (ungotp == NULL)
711 /*
712 * Normal case: no ungotten chars, so get one from the user.
713 */
714 return (getchr());
715
716 if (ungotp > ungot)
717 /*
718 * Return the next ungotten char.
719 */
720 return (*--ungotp);
721
722 /*
723 * We have just run out of ungotten chars.
724 */
725 ungotp = NULL;
726 if (len_cmdbuf() == 0 || !empty_screen())
727 return (getchr());
728 /*
729 * Command is incomplete, so try to complete it.
730 */
731 switch (mca)
732 {
733 case A_DIGIT:
734 /*
735 * We have a number but no command. Treat as #g.
736 */
737 return ('g');
738
739 case A_F_SEARCH:
740 case A_B_SEARCH:
741 /*
742 * We have "/string" but no newline. Add the \n.
743 */
744 return ('\n');
745
746 default:
747 /*
748 * Some other incomplete command. Let user complete it.
749 */
750 return (getchr());
751 }
752 }
753
754 /*
755 * "Unget" a command character.
756 * The next getcc() will return this character.
757 */
758 public void
759 ungetcc(c)
760 int c;
761 {
762 if (ungotp == NULL)
763 ungotp = ungot;
764 if (ungotp >= ungot + sizeof(ungot))
765 {
766 error("ungetcc overflow", NULL_PARG);
767 quit(QUIT_ERROR);
768 }
769 *ungotp++ = c;
770 }
771
772 /*
773 * Unget a whole string of command characters.
774 * The next sequence of getcc()'s will return this string.
775 */
776 public void
777 ungetsc(s)
778 char *s;
779 {
780 register char *p;
781
782 for (p = s + strlen(s) - 1; p >= s; p--)
783 ungetcc(*p);
784 }
785
786 /*
787 * Search for a pattern, possibly in multiple files.
788 * If SRCH_FIRST_FILE is set, begin searching at the first file.
789 * If SRCH_PAST_EOF is set, continue the search thru multiple files.
790 */
791 static void
792 multi_search(pattern, n)
793 char *pattern;
794 int n;
795 {
796 register int nomore;
797 IFILE save_ifile;
798 int changed_file;
799
800 changed_file = 0;
801 save_ifile = save_curr_ifile();
802
803 if (search_type & SRCH_FIRST_FILE)
804 {
805 /*
806 * Start at the first (or last) file
807 * in the command line list.
808 */
809 if (search_type & SRCH_FORW)
810 nomore = edit_first();
811 else
812 nomore = edit_last();
813 if (nomore)
814 {
815 unsave_ifile(save_ifile);
816 return;
817 }
818 changed_file = 1;
819 search_type &= ~SRCH_FIRST_FILE;
820 }
821
822 for (;;)
823 {
824 n = search(search_type, pattern, n);
825 /*
826 * The SRCH_NO_MOVE flag doesn't "stick": it gets cleared
827 * after being used once. This allows "n" to work after
828 * using a /@@ search.
829 */
830 search_type &= ~SRCH_NO_MOVE;
831 if (n == 0)
832 {
833 /*
834 * Found it.
835 */
836 unsave_ifile(save_ifile);
837 return;
838 }
839
840 if (n < 0)
841 /*
842 * Some kind of error in the search.
843 * Error message has been printed by search().
844 */
845 break;
846
847 if ((search_type & SRCH_PAST_EOF) == 0)
848 /*
849 * We didn't find a match, but we're
850 * supposed to search only one file.
851 */
852 break;
853 /*
854 * Move on to the next file.
855 */
856 if (search_type & SRCH_FORW)
857 nomore = edit_next(1);
858 else
859 nomore = edit_prev(1);
860 if (nomore)
861 break;
862 changed_file = 1;
863 }
864
865 /*
866 * Didn't find it.
867 * Print an error message if we haven't already.
868 */
869 if (n > 0)
870 error("Pattern not found", NULL_PARG);
871
872 if (changed_file)
873 {
874 /*
875 * Restore the file we were originally viewing.
876 */
877 reedit_ifile(save_ifile);
878 } else
879 {
880 unsave_ifile(save_ifile);
881 }
882 }
883
884 /*
885 * Main command processor.
886 * Accept and execute commands until a quit command.
887 */
888 public void
889 commands()
890 {
891 register int c;
892 register int action;
893 register char *cbuf;
894 int newaction;
895 int save_search_type;
896 char *extra;
897 char tbuf[2];
898 PARG parg;
899 IFILE old_ifile;
900 IFILE new_ifile;
901 char *tagfile;
902
903 search_type = SRCH_FORW;
904 wscroll = (sc_height + 1) / 2;
905 newaction = A_NOACTION;
906
907 for (;;)
908 {
909 mca = 0;
910 cmd_accept();
911 number = 0;
912 optchar = '\0';
913
914 /*
915 * See if any signals need processing.
916 */
917 if (sigs)
918 {
919 psignals();
920 if (quitting)
921 quit(QUIT_SAVED_STATUS);
922 }
923
924 /*
925 * See if window size changed, for systems that don't
926 * generate SIGWINCH.
927 */
928 check_winch();
929
930 /*
931 * Display prompt and accept a character.
932 */
933 cmd_reset();
934 prompt();
935 if (sigs)
936 continue;
937 if (newaction == A_NOACTION)
938 c = getcc();
939
940 again:
941 if (sigs)
942 continue;
943
944 if (newaction != A_NOACTION)
945 {
946 action = newaction;
947 newaction = A_NOACTION;
948 } else
949 {
950 /*
951 * If we are in a multicharacter command, call mca_char.
952 * Otherwise we call fcmd_decode to determine the
953 * action to be performed.
954 */
955 if (mca)
956 switch (mca_char(c))
957 {
958 case MCA_MORE:
959 /*
960 * Need another character.
961 */
962 c = getcc();
963 goto again;
964 case MCA_DONE:
965 /*
966 * Command has been handled by mca_char.
967 * Start clean with a prompt.
968 */
969 continue;
970 case NO_MCA:
971 /*
972 * Not a multi-char command
973 * (at least, not anymore).
974 */
975 break;
976 }
977
978 /*
979 * Decode the command character and decide what to do.
980 */
981 if (mca)
982 {
983 /*
984 * We're in a multichar command.
985 * Add the character to the command buffer
986 * and display it on the screen.
987 * If the user backspaces past the start
988 * of the line, abort the command.
989 */
990 if (cmd_char(c) == CC_QUIT || len_cmdbuf() == 0)
991 continue;
992 cbuf = get_cmdbuf();
993 } else
994 {
995 /*
996 * Don't use cmd_char if we're starting fresh
997 * at the beginning of a command, because we
998 * don't want to echo the command until we know
999 * it is a multichar command. We also don't
1000 * want erase_char/kill_char to be treated
1001 * as line editing characters.
1002 */
1003 tbuf[0] = c;
1004 tbuf[1] = '\0';
1005 cbuf = tbuf;
1006 }
1007 extra = NULL;
1008 action = fcmd_decode(cbuf, &extra);
1009 /*
1010 * If an "extra" string was returned,
1011 * process it as a string of command characters.
1012 */
1013 if (extra != NULL)
1014 ungetsc(extra);
1015 }
1016 /*
1017 * Clear the cmdbuf string.
1018 * (But not if we're in the prefix of a command,
1019 * because the partial command string is kept there.)
1020 */
1021 if (action != A_PREFIX)
1022 cmd_reset();
1023
1024 switch (action)
1025 {
1026 case A_DIGIT:
1027 /*
1028 * First digit of a number.
1029 */
1030 start_mca(A_DIGIT, ":", (void*)NULL, CF_QUIT_ON_ERASE);
1031 goto again;
1032
1033 case A_F_WINDOW:
1034 /*
1035 * Forward one window (and set the window size).
1036 */
1037 if (number > 0)
1038 swindow = (int) number;
1039 /* FALLTHRU */
1040 case A_F_SCREEN:
1041 /*
1042 * Forward one screen.
1043 */
1044 if (number <= 0)
1045 number = get_swindow();
1046 cmd_exec();
1047 if (show_attn)
1048 set_attnpos(bottompos);
1049 forward((int) number, 0, 1);
1050 break;
1051
1052 case A_B_WINDOW:
1053 /*
1054 * Backward one window (and set the window size).
1055 */
1056 if (number > 0)
1057 swindow = (int) number;
1058 /* FALLTHRU */
1059 case A_B_SCREEN:
1060 /*
1061 * Backward one screen.
1062 */
1063 if (number <= 0)
1064 number = get_swindow();
1065 cmd_exec();
1066 backward((int) number, 0, 1);
1067 break;
1068
1069 case A_F_LINE:
1070 /*
1071 * Forward N (default 1) line.
1072 */
1073 if (number <= 0)
1074 number = 1;
1075 cmd_exec();
1076 if (show_attn == OPT_ONPLUS && number > 1)
1077 set_attnpos(bottompos);
1078 forward((int) number, 0, 0);
1079 break;
1080
1081 case A_B_LINE:
1082 /*
1083 * Backward N (default 1) line.
1084 */
1085 if (number <= 0)
1086 number = 1;
1087 cmd_exec();
1088 backward((int) number, 0, 0);
1089 break;
1090
1091 case A_FF_LINE:
1092 /*
1093 * Force forward N (default 1) line.
1094 */
1095 if (number <= 0)
1096 number = 1;
1097 cmd_exec();
1098 if (show_attn == OPT_ONPLUS && number > 1)
1099 set_attnpos(bottompos);
1100 forward((int) number, 1, 0);
1101 break;
1102
1103 case A_BF_LINE:
1104 /*
1105 * Force backward N (default 1) line.
1106 */
1107 if (number <= 0)
1108 number = 1;
1109 cmd_exec();
1110 backward((int) number, 1, 0);
1111 break;
1112
1113 case A_FF_SCREEN:
1114 /*
1115 * Force forward one screen.
1116 */
1117 if (number <= 0)
1118 number = get_swindow();
1119 cmd_exec();
1120 if (show_attn == OPT_ONPLUS)
1121 set_attnpos(bottompos);
1122 forward((int) number, 1, 0);
1123 break;
1124
1125 case A_F_FOREVER:
1126 /*
1127 * Forward forever, ignoring EOF.
1128 */
1129 if (ch_getflags() & CH_HELPFILE)
1130 break;
1131 cmd_exec();
1132 jump_forw();
1133 ignore_eoi = 1;
1134 hit_eof = 0;
1135 while (!sigs)
1136 {
1137 make_display();
1138 forward(1, 0, 0);
1139 }
1140 ignore_eoi = 0;
1141 /*
1142 * This gets us back in "F mode" after processing
1143 * a non-abort signal (e.g. window-change).
1144 */
1145 if (sigs && !ABORT_SIGS())
1146 newaction = A_F_FOREVER;
1147 break;
1148
1149 case A_F_SCROLL:
1150 /*
1151 * Forward N lines
1152 * (default same as last 'd' or 'u' command).
1153 */
1154 if (number > 0)
1155 wscroll = (int) number;
1156 cmd_exec();
1157 if (show_attn == OPT_ONPLUS)
1158 set_attnpos(bottompos);
1159 forward(wscroll, 0, 0);
1160 break;
1161
1162 case A_B_SCROLL:
1163 /*
1164 * Forward N lines
1165 * (default same as last 'd' or 'u' command).
1166 */
1167 if (number > 0)
1168 wscroll = (int) number;
1169 cmd_exec();
1170 backward(wscroll, 0, 0);
1171 break;
1172
1173 case A_FREPAINT:
1174 /*
1175 * Flush buffers, then repaint screen.
1176 * Don't flush the buffers on a pipe!
1177 */
1178 clear_buffers();
1179 /* FALLTHRU */
1180 case A_REPAINT:
1181 /*
1182 * Repaint screen.
1183 */
1184 cmd_exec();
1185 repaint();
1186 break;
1187
1188 case A_GOLINE:
1189 /*
1190 * Go to line N, default beginning of file.
1191 */
1192 if (number <= 0)
1193 number = 1;
1194 cmd_exec();
1195 jump_back(number);
1196 break;
1197
1198 case A_PERCENT:
1199 /*
1200 * Go to a specified percentage into the file.
1201 */
1202 if (number < 0)
1203 {
1204 number = 0;
1205 fraction = 0;
1206 }
1207 if (number > 100)
1208 {
1209 number = 100;
1210 fraction = 0;
1211 }
1212 cmd_exec();
1213 jump_percent((int) number, fraction);
1214 break;
1215
1216 case A_GOEND:
1217 /*
1218 * Go to line N, default end of file.
1219 */
1220 cmd_exec();
1221 if (number <= 0)
1222 jump_forw();
1223 else
1224 jump_back(number);
1225 break;
1226
1227 case A_GOPOS:
1228 /*
1229 * Go to a specified byte position in the file.
1230 */
1231 cmd_exec();
1232 if (number < 0)
1233 number = 0;
1234 jump_line_loc((POSITION) number, jump_sline);
1235 break;
1236
1237 case A_STAT:
1238 /*
1239 * Print file name, etc.
1240 */
1241 if (ch_getflags() & CH_HELPFILE)
1242 break;
1243 cmd_exec();
1244 parg.p_string = eq_message();
1245 error("%s", &parg);
1246 break;
1247
1248 case A_VERSION:
1249 /*
1250 * Print version number, without the "@(#)".
1251 */
1252 cmd_exec();
1253 dispversion();
1254 break;
1255
1256 case A_QUIT:
1257 /*
1258 * Exit.
1259 */
1260 if (curr_ifile != NULL_IFILE &&
1261 ch_getflags() & CH_HELPFILE)
1262 {
1263 /*
1264 * Quit while viewing the help file
1265 * just means return to viewing the
1266 * previous file.
1267 */
1268 hshift = save_hshift;
1269 if (edit_prev(1) == 0)
1270 break;
1271 }
1272 if (extra != NULL)
1273 quit(*extra);
1274 quit(QUIT_OK);
1275 break;
1276
1277 /*
1278 * Define abbreviation for a commonly used sequence below.
1279 */
1280 #define DO_SEARCH() \
1281 if (number <= 0) number = 1; \
1282 mca_search(); \
1283 cmd_exec(); \
1284 multi_search((char *)NULL, (int) number);
1285
1286
1287 case A_F_SEARCH:
1288 /*
1289 * Search forward for a pattern.
1290 * Get the first char of the pattern.
1291 */
1292 search_type = SRCH_FORW;
1293 if (number <= 0)
1294 number = 1;
1295 mca_search();
1296 c = getcc();
1297 goto again;
1298
1299 case A_B_SEARCH:
1300 /*
1301 * Search backward for a pattern.
1302 * Get the first char of the pattern.
1303 */
1304 search_type = SRCH_BACK;
1305 if (number <= 0)
1306 number = 1;
1307 mca_search();
1308 c = getcc();
1309 goto again;
1310
1311 case A_AGAIN_SEARCH:
1312 /*
1313 * Repeat previous search.
1314 */
1315 DO_SEARCH();
1316 break;
1317
1318 case A_T_AGAIN_SEARCH:
1319 /*
1320 * Repeat previous search, multiple files.
1321 */
1322 search_type |= SRCH_PAST_EOF;
1323 DO_SEARCH();
1324 break;
1325
1326 case A_REVERSE_SEARCH:
1327 /*
1328 * Repeat previous search, in reverse direction.
1329 */
1330 save_search_type = search_type;
1331 search_type = SRCH_REVERSE(search_type);
1332 DO_SEARCH();
1333 search_type = save_search_type;
1334 break;
1335
1336 case A_T_REVERSE_SEARCH:
1337 /*
1338 * Repeat previous search,
1339 * multiple files in reverse direction.
1340 */
1341 save_search_type = search_type;
1342 search_type = SRCH_REVERSE(search_type);
1343 search_type |= SRCH_PAST_EOF;
1344 DO_SEARCH();
1345 search_type = save_search_type;
1346 break;
1347
1348 case A_UNDO_SEARCH:
1349 undo_search();
1350 break;
1351
1352 case A_HELP:
1353 /*
1354 * Help.
1355 */
1356 if (ch_getflags() & CH_HELPFILE)
1357 break;
1358 cmd_exec();
1359 save_hshift = hshift;
1360 hshift = 0;
1361 (void) edit(FAKE_HELPFILE);
1362 break;
1363
1364 case A_EXAMINE:
1365 #if EXAMINE
1366 /*
1367 * Edit a new file. Get the filename.
1368 */
1369 if (secure)
1370 {
1371 error("Command not available", NULL_PARG);
1372 break;
1373 }
1374 start_mca(A_EXAMINE, "Examine: ", ml_examine, 0);
1375 c = getcc();
1376 goto again;
1377 #else
1378 error("Command not available", NULL_PARG);
1379 break;
1380 #endif
1381
1382 case A_VISUAL:
1383 /*
1384 * Invoke an editor on the input file.
1385 */
1386 #if EDITOR
1387 if (secure)
1388 {
1389 error("Command not available", NULL_PARG);
1390 break;
1391 }
1392 if (ch_getflags() & CH_HELPFILE)
1393 break;
1394 if (strcmp(get_filename(curr_ifile), "-") == 0)
1395 {
1396 error("Cannot edit standard input", NULL_PARG);
1397 break;
1398 }
1399 if (curr_altfilename != NULL)
1400 {
1401 error("WARNING: This file was viewed via LESSOPEN",
1402 NULL_PARG);
1403 }
1404 start_mca(A_SHELL, "!", ml_shell, 0);
1405 /*
1406 * Expand the editor prototype string
1407 * and pass it to the system to execute.
1408 * (Make sure the screen is displayed so the
1409 * expansion of "+%lm" works.)
1410 */
1411 make_display();
1412 cmd_exec();
1413 lsystem(pr_expand(editproto, 0), (char*)NULL);
1414 break;
1415 #else
1416 error("Command not available", NULL_PARG);
1417 break;
1418 #endif
1419
1420 case A_NEXT_FILE:
1421 /*
1422 * Examine next file.
1423 */
1424 #if TAGS
1425 if (ntags())
1426 {
1427 error("No next file", NULL_PARG);
1428 break;
1429 }
1430 #endif
1431 if (number <= 0)
1432 number = 1;
1433 if (edit_next((int) number))
1434 {
1435 if (get_quit_at_eof() && hit_eof &&
1436 !(ch_getflags() & CH_HELPFILE))
1437 quit(QUIT_OK);
1438 parg.p_string = (number > 1) ? "(N-th) " : "";
1439 error("No %snext file", &parg);
1440 }
1441 break;
1442
1443 case A_PREV_FILE:
1444 /*
1445 * Examine previous file.
1446 */
1447 #if TAGS
1448 if (ntags())
1449 {
1450 error("No previous file", NULL_PARG);
1451 break;
1452 }
1453 #endif
1454 if (number <= 0)
1455 number = 1;
1456 if (edit_prev((int) number))
1457 {
1458 parg.p_string = (number > 1) ? "(N-th) " : "";
1459 error("No %sprevious file", &parg);
1460 }
1461 break;
1462
1463 case A_NEXT_TAG:
1464 #if TAGS
1465 if (number <= 0)
1466 number = 1;
1467 tagfile = nexttag((int) number);
1468 if (tagfile == NULL)
1469 {
1470 error("No next tag", NULL_PARG);
1471 break;
1472 }
1473 if (edit(tagfile) == 0)
1474 {
1475 POSITION pos = tagsearch();
1476 if (pos != NULL_POSITION)
1477 jump_loc(pos, jump_sline);
1478 }
1479 #else
1480 error("Command not available", NULL_PARG);
1481 #endif
1482 break;
1483
1484 case A_PREV_TAG:
1485 #if TAGS
1486 if (number <= 0)
1487 number = 1;
1488 tagfile = prevtag((int) number);
1489 if (tagfile == NULL)
1490 {
1491 error("No previous tag", NULL_PARG);
1492 break;
1493 }
1494 if (edit(tagfile) == 0)
1495 {
1496 POSITION pos = tagsearch();
1497 if (pos != NULL_POSITION)
1498 jump_loc(pos, jump_sline);
1499 }
1500 #else
1501 error("Command not available", NULL_PARG);
1502 #endif
1503 break;
1504
1505 case A_INDEX_FILE:
1506 /*
1507 * Examine a particular file.
1508 */
1509 if (number <= 0)
1510 number = 1;
1511 if (edit_index((int) number))
1512 error("No such file", NULL_PARG);
1513 break;
1514
1515 case A_REMOVE_FILE:
1516 if (ch_getflags() & CH_HELPFILE)
1517 break;
1518 old_ifile = curr_ifile;
1519 new_ifile = getoff_ifile(curr_ifile);
1520 if (new_ifile == NULL_IFILE)
1521 {
1522 bell();
1523 break;
1524 }
1525 if (edit_ifile(new_ifile) != 0)
1526 {
1527 reedit_ifile(old_ifile);
1528 break;
1529 }
1530 del_ifile(old_ifile);
1531 break;
1532
1533 case A_OPT_TOGGLE:
1534 optflag = OPT_TOGGLE;
1535 optgetname = FALSE;
1536 mca_opt_toggle();
1537 c = getcc();
1538 goto again;
1539
1540 case A_DISP_OPTION:
1541 /*
1542 * Report a flag setting.
1543 */
1544 optflag = OPT_NO_TOGGLE;
1545 optgetname = FALSE;
1546 mca_opt_toggle();
1547 c = getcc();
1548 goto again;
1549
1550 case A_FIRSTCMD:
1551 /*
1552 * Set an initial command for new files.
1553 */
1554 start_mca(A_FIRSTCMD, "+", (void*)NULL, 0);
1555 c = getcc();
1556 goto again;
1557
1558 case A_SHELL:
1559 /*
1560 * Shell escape.
1561 */
1562 #if SHELL_ESCAPE
1563 if (secure)
1564 {
1565 error("Command not available", NULL_PARG);
1566 break;
1567 }
1568 start_mca(A_SHELL, "!", ml_shell, 0);
1569 c = getcc();
1570 goto again;
1571 #else
1572 error("Command not available", NULL_PARG);
1573 break;
1574 #endif
1575
1576 case A_SETMARK:
1577 /*
1578 * Set a mark.
1579 */
1580 if (ch_getflags() & CH_HELPFILE)
1581 break;
1582 start_mca(A_SETMARK, "mark: ", (void*)NULL, 0);
1583 c = getcc();
1584 if (c == erase_char || c == erase2_char ||
1585 c == kill_char || c == '\n' || c == '\r')
1586 break;
1587 setmark(c);
1588 break;
1589
1590 case A_GOMARK:
1591 /*
1592 * Go to a mark.
1593 */
1594 start_mca(A_GOMARK, "goto mark: ", (void*)NULL, 0);
1595 c = getcc();
1596 if (c == erase_char || c == erase2_char ||
1597 c == kill_char || c == '\n' || c == '\r')
1598 break;
1599 cmd_exec();
1600 gomark(c);
1601 break;
1602
1603 case A_PIPE:
1604 #if PIPEC
1605 if (secure)
1606 {
1607 error("Command not available", NULL_PARG);
1608 break;
1609 }
1610 start_mca(A_PIPE, "|mark: ", (void*)NULL, 0);
1611 c = getcc();
1612 if (c == erase_char || c == erase2_char || c == kill_char)
1613 break;
1614 if (c == '\n' || c == '\r')
1615 c = '.';
1616 if (badmark(c))
1617 break;
1618 pipec = c;
1619 start_mca(A_PIPE, "!", ml_shell, 0);
1620 c = getcc();
1621 goto again;
1622 #else
1623 error("Command not available", NULL_PARG);
1624 break;
1625 #endif
1626
1627 case A_B_BRACKET:
1628 case A_F_BRACKET:
1629 start_mca(action, "Brackets: ", (void*)NULL, 0);
1630 c = getcc();
1631 goto again;
1632
1633 case A_LSHIFT:
1634 if (number > 0)
1635 shift_count = number;
1636 else
1637 number = (shift_count > 0) ?
1638 shift_count : sc_width / 2;
1639 if (number > hshift)
1640 number = hshift;
1641 hshift -= number;
1642 screen_trashed = 1;
1643 break;
1644
1645 case A_RSHIFT:
1646 if (number > 0)
1647 shift_count = number;
1648 else
1649 number = (shift_count > 0) ?
1650 shift_count : sc_width / 2;
1651 hshift += number;
1652 screen_trashed = 1;
1653 break;
1654
1655 case A_PREFIX:
1656 /*
1657 * The command is incomplete (more chars are needed).
1658 * Display the current char, so the user knows
1659 * what's going on, and get another character.
1660 */
1661 if (mca != A_PREFIX)
1662 {
1663 cmd_reset();
1664 start_mca(A_PREFIX, " ", (void*)NULL,
1665 CF_QUIT_ON_ERASE);
1666 (void) cmd_char(c);
1667 }
1668 c = getcc();
1669 goto again;
1670
1671 case A_NOACTION:
1672 break;
1673
1674 default:
1675 bell();
1676 break;
1677 }
1678 }
1679 }
DragonFly BSD