1 /*
2 * Copyright (C) 1984-2025 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, see the README file.
8 */
9
10
11 /*
12 * The option table.
13 */
14
15 #include "less.h"
16 #include "option.h"
17
18 /*
19 * Variables controlled by command line options.
20 */
21 public int quiet; /* Should we suppress the audible bell? */
22 public int no_vbell; /* Should we suppress the visual bell? */
23 public int how_search; /* Where should forward searches start? */
24 public int top_scroll; /* Repaint screen from top?
25 (alternative is scroll from bottom) */
26 public int pr_type; /* Type of prompt (short, medium, long) */
27 public int bs_mode; /* How to process backspaces */
28 public int know_dumb; /* Don't complain about dumb terminals */
29 public int quit_at_eof; /* Quit after hitting end of file twice */
30 public int quit_if_one_screen; /* Quit if EOF on first screen */
31 public int squeeze; /* Squeeze multiple blank lines into one */
32 public int tabstop; /* Tab settings */
33 public int back_scroll; /* Repaint screen on backwards movement */
34 public int forw_scroll; /* Repaint screen on forward movement */
35 public int caseless; /* Do "caseless" searches */
36 public int linenums; /* Use line numbers */
37 public int autobuf; /* Automatically allocate buffers as needed */
38 public int bufspace; /* Max buffer space per file (K) */
39 public int ctldisp; /* Send control chars to screen untranslated */
40 public int force_open; /* Open the file even if not regular file */
41 public int swindow; /* Size of scrolling window */
42 public int jump_sline; /* Screen line of "jump target" */
43 public long jump_sline_fraction = -1;
44 public int shift_count; /* Number of positions to shift horizontally */
45 public long shift_count_fraction = -1;
46 public int chopline; /* Truncate displayed lines at screen width */
47 public int wordwrap; /* Wrap lines at space */
48 public int no_init; /* Disable sending ti/te termcap strings */
49 public int no_keypad; /* Disable sending ks/ke termcap strings */
50 public int twiddle; /* Show tildes after EOF */
51 public int show_attn; /* Hilite first unread line */
52 public int status_col; /* Display a status column */
53 public int use_lessopen; /* Use the LESSOPEN filter */
54 public int quit_on_intr; /* Quit on interrupt */
55 public int follow_mode; /* F cmd Follows file desc or file name? */
56 public int oldbot; /* Old bottom of screen behavior {{REMOVE}} */
57 public int opt_use_backslash; /* Use backslash escaping in option parsing */
58 public LWCHAR rscroll_char; /* Char which marks chopped lines with -S */
59 public int rscroll_attr; /* Attribute of rscroll_char */
60 public int no_hist_dups; /* Remove dups from history list */
61 public int mousecap; /* Allow mouse for scrolling */
62 public int wheel_lines; /* Number of lines to scroll on mouse wheel scroll */
63 public int perma_marks; /* Save marks in history file */
64 public int linenum_width; /* Width of line numbers */
65 public int status_col_width; /* Width of status column */
66 public int incr_search; /* Incremental search */
67 public int use_color; /* Use UI color */
68 public int want_filesize; /* Scan to EOF if necessary to get file size */
69 public int status_line; /* Highlight entire marked lines */
70 public int header_lines; /* Freeze header lines at top of screen */
71 public int header_cols; /* Freeze header columns at left of screen */
72 public int nonum_headers; /* Don't give headers line numbers */
73 public int nosearch_header_lines = 0; /* Don't search in header lines */
74 public int nosearch_header_cols = 0; /* Don't search in header columns */
75 public int redraw_on_quit; /* Redraw last screen after term deinit */
76 public int def_search_type; /* */
77 public int exit_F_on_close; /* Exit F command when input closes */
78 public int modelines; /* Lines to read looking for modelines */
79 public int show_preproc_error; /* Display msg when preproc exits with error */
80 public int proc_backspace; /* Special handling of backspace */
81 public int proc_tab; /* Special handling of tab */
82 public int proc_return; /* Special handling of carriage return */
83 public int match_shift; /* Extra horizontal shift on search match */
84 public int no_paste; /* Don't accept pasted input */
85 public int no_edit_warn; /* Don't warn when editing a LESSOPENed file */
86 public int stop_on_form_feed; /* Stop scrolling on a line starting with form feed */
87 public long match_shift_fraction = NUM_FRAC_DENOM/2; /* 1/2 of screen width */
88 public char intr_char = CONTROL('X'); /* Char to interrupt reads */
89 public char *first_cmd_at_prompt = NULL; /* Command to exec before first prompt */
90 #if HILITE_SEARCH
91 public int hilite_search; /* Highlight matched search patterns? */
92 #endif
93
94 public int less_is_more = 0; /* Make compatible with POSIX more */
95
96 /*
97 * Long option names.
98 */
99 static struct optname a_optname = { "search-skip-screen", NULL };
100 static struct optname b_optname = { "buffers", NULL };
101 static struct optname B__optname = { "auto-buffers", NULL };
102 static struct optname c_optname = { "clear-screen", NULL };
103 static struct optname d_optname = { "dumb", NULL };
104 static struct optname D__optname = { "color", NULL };
105 static struct optname e_optname = { "quit-at-eof", NULL };
106 static struct optname f_optname = { "force", NULL };
107 static struct optname F__optname = { "quit-if-one-screen", NULL };
108 #if HILITE_SEARCH
109 static struct optname g_optname = { "hilite-search", NULL };
110 #endif
111 static struct optname h_optname = { "max-back-scroll", NULL };
112 static struct optname i_optname = { "ignore-case", NULL };
113 static struct optname j_optname = { "jump-target", NULL };
114 static struct optname J__optname = { "status-column", NULL };
115 #if USERFILE
116 static struct optname k_optname = { "lesskey-file", NULL };
117 #if HAVE_LESSKEYSRC
118 static struct optname ks_optname = { "lesskey-src", NULL };
119 static struct optname kc_optname = { "lesskey-content", NULL };
120 #endif /* HAVE_LESSKEYSRC */
121 #endif
122 static struct optname K__optname = { "quit-on-intr", NULL };
123 static struct optname L__optname = { "no-lessopen", NULL };
124 static struct optname m_optname = { "long-prompt", NULL };
125 static struct optname n_optname = { "line-numbers", NULL };
126 #if LOGFILE
127 static struct optname o_optname = { "log-file", NULL };
128 static struct optname O__optname = { "LOG-FILE", NULL };
129 #endif
130 static struct optname p_optname = { "pattern", NULL };
131 static struct optname P__optname = { "prompt", NULL };
132 static struct optname q2_optname = { "silent", NULL };
133 static struct optname q_optname = { "quiet", &q2_optname };
134 static struct optname r_optname = { "raw-control-chars", NULL };
135 static struct optname s_optname = { "squeeze-blank-lines", NULL };
136 static struct optname S__optname = { "chop-long-lines", NULL };
137 #if TAGS
138 static struct optname t_optname = { "tag", NULL };
139 static struct optname T__optname = { "tag-file", NULL };
140 #endif
141 static struct optname u_optname = { "underline-special", NULL };
142 static struct optname V__optname = { "version", NULL };
143 static struct optname w_optname = { "hilite-unread", NULL };
144 static struct optname x_optname = { "tabs", NULL };
145 static struct optname X__optname = { "no-init", NULL };
146 static struct optname y_optname = { "max-forw-scroll", NULL };
147 static struct optname z_optname = { "window", NULL };
148 static struct optname quote_optname = { "quotes", NULL };
149 static struct optname tilde_optname = { "tilde", NULL };
150 static struct optname query_optname = { "help", NULL };
151 static struct optname pound_optname = { "shift", NULL };
152 static struct optname keypad_optname = { "no-keypad", NULL };
153 static struct optname oldbot_optname = { "old-bot", NULL };
154 static struct optname follow_optname = { "follow-name", NULL };
155 static struct optname use_backslash_optname = { "use-backslash", NULL };
156 static struct optname rscroll_optname = { "rscroll", NULL };
157 static struct optname nohistdups_optname = { "no-histdups", NULL };
158 static struct optname mousecap_optname = { "mouse", NULL };
159 static struct optname wheel_lines_optname = { "wheel-lines", NULL };
160 static struct optname perma_marks_optname = { "save-marks", NULL };
161 static struct optname linenum_width_optname = { "line-num-width", NULL };
162 static struct optname status_col_width_optname = { "status-col-width", NULL };
163 static struct optname incr_search_optname = { "incsearch", NULL };
164 static struct optname use_color_optname = { "use-color", NULL };
165 static struct optname want_filesize_optname = { "file-size", NULL };
166 static struct optname status_line_optname = { "status-line", NULL };
167 static struct optname header_optname = { "header", NULL };
168 static struct optname no_paste_optname = { "no-paste", NULL };
169 static struct optname form_feed_optname = { "form-feed", NULL };
170 static struct optname no_edit_warn_optname2 = { "no-warn-edit", NULL };
171 static struct optname no_edit_warn_optname = { "no-edit-warn", &no_edit_warn_optname2 };
172 static struct optname nonum_headers_optname = { "no-number-headers", NULL };
173 static struct optname nosearch_headers_optname = { "no-search-headers", NULL };
174 static struct optname nosearch_header_lines_optname = { "no-search-header-lines", NULL };
175 static struct optname nosearch_header_cols_optname = { "no-search-header-columns", NULL };
176 static struct optname redraw_on_quit_optname = { "redraw-on-quit", NULL };
177 static struct optname search_type_optname = { "search-options", NULL };
178 static struct optname exit_F_on_close_optname = { "exit-follow-on-close", NULL };
179 static struct optname modelines_optname = { "modelines", NULL };
180 static struct optname no_vbell_optname = { "no-vbell", NULL };
181 static struct optname intr_optname = { "intr", NULL };
182 static struct optname wordwrap_optname = { "wordwrap", NULL };
183 static struct optname show_preproc_error_optname = { "show-preproc-errors", NULL };
184 static struct optname proc_backspace_optname = { "proc-backspace", NULL };
185 static struct optname proc_tab_optname = { "proc-tab", NULL };
186 static struct optname proc_return_optname = { "proc-return", NULL };
187 static struct optname match_shift_optname = { "match-shift", NULL };
188 static struct optname first_cmd_at_prompt_optname = { "cmd", NULL };
189 #if LESSTEST
190 static struct optname ttyin_name_optname = { "tty", NULL };
191 #endif /*LESSTEST*/
192
193
194 /*
195 * Table of all options and their semantics.
196 *
197 * For BOOL and TRIPLE options, odesc[0], odesc[1], odesc[2] are
198 * the description of the option when set to 0, 1 or 2, respectively.
199 * For NUMBER options, odesc[0] is the prompt to use when entering
200 * a new value, and odesc[1] is the description, which should contain
201 * one %d which is replaced by the value of the number.
202 * For STRING options, odesc[0] is the prompt to use when entering
203 * a new value, and odesc[1], if not NULL, is the set of characters
204 * that are valid in the string.
205 */
206 static struct loption option[] =
207 {
208 { 'a', &a_optname,
209 O_TRIPLE, OPT_ONPLUS, &how_search, NULL,
210 {
211 "Search includes displayed screen",
212 "Search skips displayed screen",
213 "Search includes all of displayed screen"
214 }
215 },
216
217 { 'b', &b_optname,
218 O_NUMBER|O_INIT_HANDLER, 64, &bufspace, opt_b,
219 {
220 "Max buffer space per file (K): ",
221 "Max buffer space per file: %dK",
222 NULL
223 }
224 },
225 { 'B', &B__optname,
226 O_BOOL, OPT_ON, &autobuf, NULL,
227 {
228 "Don't automatically allocate buffers",
229 "Automatically allocate buffers when needed",
230 NULL
231 }
232 },
233 { 'c', &c_optname,
234 O_TRIPLE, OPT_OFF, &top_scroll, NULL,
235 {
236 "Repaint by scrolling from bottom of screen",
237 "Repaint by painting from top of screen",
238 "Repaint by painting from top of screen"
239 }
240 },
241 { 'd', &d_optname,
242 O_BOOL|O_NO_TOGGLE, OPT_OFF, &know_dumb, NULL,
243 {
244 "Assume intelligent terminal",
245 "Assume dumb terminal",
246 NULL
247 }
248 },
249 { 'D', &D__optname,
250 O_STRING|O_REPAINT|O_NO_QUERY, 0, NULL, opt_D,
251 { "color desc: ", "s", NULL }
252 },
253 { 'e', &e_optname,
254 O_TRIPLE, OPT_OFF, &quit_at_eof, NULL,
255 {
256 "Don't quit at end-of-file",
257 "Quit at end-of-file",
258 "Quit immediately at end-of-file"
259 }
260 },
261 { 'f', &f_optname,
262 O_BOOL, OPT_OFF, &force_open, NULL,
263 {
264 "Open only regular files",
265 "Open even non-regular files",
266 NULL
267 }
268 },
269 { 'F', &F__optname,
270 O_BOOL, OPT_OFF, &quit_if_one_screen, NULL,
271 {
272 "Don't quit if end-of-file on first screen",
273 "Quit if end-of-file on first screen",
274 NULL
275 }
276 },
277 #if HILITE_SEARCH
278 { 'g', &g_optname,
279 O_TRIPLE|O_HL_REPAINT, OPT_ONPLUS, &hilite_search, NULL,
280 {
281 "Don't highlight search matches",
282 "Highlight matches for previous search only",
283 "Highlight all matches for previous search pattern",
284 }
285 },
286 #endif
287 { 'h', &h_optname,
288 O_NUMBER, -1, &back_scroll, NULL,
289 {
290 "Backwards scroll limit: ",
291 "Backwards scroll limit is %d lines",
292 NULL
293 }
294 },
295 { 'i', &i_optname,
296 O_TRIPLE|O_HL_REPAINT, OPT_OFF, &caseless, opt_i,
297 {
298 "Case is significant in searches",
299 "Ignore case in searches",
300 "Ignore case in searches and in patterns"
301 }
302 },
303 { 'j', &j_optname,
304 O_STRING, 0, NULL, opt_j,
305 {
306 "Target line: ",
307 "-.d",
308 NULL
309 }
310 },
311 { 'J', &J__optname,
312 O_BOOL|O_REPAINT, OPT_OFF, &status_col, NULL,
313 {
314 "Don't display a status column",
315 "Display a status column",
316 NULL
317 }
318 },
319 #if USERFILE
320 { 'k', &k_optname,
321 O_STRING|O_NO_TOGGLE|O_NO_QUERY, 0, NULL, opt_k,
322 { NULL, NULL, NULL }
323 },
324 #if HAVE_LESSKEYSRC
325 { OLETTER_NONE, &kc_optname,
326 O_STRING|O_NO_TOGGLE|O_NO_QUERY, 0, NULL, opt_kc,
327 { NULL, NULL, NULL }
328 },
329 { OLETTER_NONE, &ks_optname,
330 O_STRING|O_NO_TOGGLE|O_NO_QUERY, 0, NULL, opt_ks,
331 { NULL, NULL, NULL }
332 },
333 #endif /* HAVE_LESSKEYSRC */
334 #endif
335 { 'K', &K__optname,
336 O_BOOL, OPT_OFF, &quit_on_intr, NULL,
337 {
338 "Interrupt (ctrl-C) returns to prompt",
339 "Interrupt (ctrl-C) exits less",
340 NULL
341 }
342 },
343 { 'L', &L__optname,
344 O_BOOL, OPT_ON, &use_lessopen, NULL,
345 {
346 "Don't use the LESSOPEN filter",
347 "Use the LESSOPEN filter",
348 NULL
349 }
350 },
351 { 'm', &m_optname,
352 O_TRIPLE, OPT_OFF, &pr_type, NULL,
353 {
354 "Short prompt",
355 "Medium prompt",
356 "Long prompt"
357 }
358 },
359 { 'n', &n_optname,
360 O_TRIPLE|O_REPAINT, OPT_ON, &linenums, NULL,
361 {
362 "Don't use line numbers",
363 "Use line numbers",
364 "Constantly display line numbers"
365 }
366 },
367 #if LOGFILE
368 { 'o', &o_optname,
369 O_STRING, 0, NULL, opt_o,
370 { "log file: ", NULL, NULL }
371 },
372 { 'O', &O__optname,
373 O_STRING, 0, NULL, opt__O,
374 { "Log file: ", NULL, NULL }
375 },
376 #endif
377 { 'p', &p_optname,
378 O_STRING|O_NO_TOGGLE|O_NO_QUERY, 0, NULL, opt_p,
379 { NULL, NULL, NULL }
380 },
381 { 'P', &P__optname,
382 O_STRING, 0, NULL, opt__P,
383 { "prompt: ", NULL, NULL }
384 },
385 { 'q', &q_optname,
386 O_TRIPLE, OPT_OFF, &quiet, NULL,
387 {
388 "Ring the bell for errors AND at eof/bof",
389 "Ring the bell for errors but not at eof/bof",
390 "Never ring the bell"
391 }
392 },
393 { 'r', &r_optname,
394 O_TRIPLE|O_REPAINT, OPT_OFF, &ctldisp, NULL,
395 {
396 "Display control characters as ^X",
397 "Display control characters directly (not recommended)",
398 "Display ANSI sequences directly, other control characters as ^X"
399 }
400 },
401 { 's', &s_optname,
402 O_BOOL|O_REPAINT, OPT_OFF, &squeeze, NULL,
403 {
404 "Display all blank lines",
405 "Squeeze multiple blank lines",
406 NULL
407 }
408 },
409 { 'S', &S__optname,
410 O_BOOL|O_REPAINT, OPT_OFF, &chopline, opt__S,
411 {
412 "Fold long lines",
413 "Chop long lines",
414 NULL
415 }
416 },
417 #if TAGS
418 { 't', &t_optname,
419 O_STRING|O_NO_QUERY, 0, NULL, opt_t,
420 { "tag: ", NULL, NULL }
421 },
422 { 'T', &T__optname,
423 O_STRING, 0, NULL, opt__T,
424 { "tags file: ", NULL, NULL }
425 },
426 #endif
427 { 'u', &u_optname,
428 O_TRIPLE|O_REPAINT|O_HL_REPAINT, OPT_OFF, &bs_mode, NULL,
429 {
430 "Display underlined text in underline mode",
431 "Backspaces cause overstrike",
432 "Print backspace as ^H"
433 }
434 },
435 { 'V', &V__optname,
436 O_NOVAR, 0, NULL, opt__V,
437 { NULL, NULL, NULL }
438 },
439 { 'w', &w_optname,
440 O_TRIPLE|O_REPAINT, OPT_OFF, &show_attn, NULL,
441 {
442 "Don't highlight first unread line",
443 "Highlight first unread line after forward-screen",
444 "Highlight first unread line after any forward movement",
445 }
446 },
447 { 'x', &x_optname,
448 O_STRING|O_REPAINT, 0, NULL, opt_x,
449 {
450 "Tab stops: ",
451 "d,",
452 NULL
453 }
454 },
455 { 'X', &X__optname,
456 O_BOOL|O_NO_TOGGLE, OPT_OFF, &no_init, NULL,
457 {
458 "Send init/deinit strings to terminal",
459 "Don't use init/deinit strings",
460 NULL
461 }
462 },
463 { 'y', &y_optname,
464 O_NUMBER, -1, &forw_scroll, NULL,
465 {
466 "Forward scroll limit: ",
467 "Forward scroll limit is %d lines",
468 NULL
469 }
470 },
471 { 'z', &z_optname,
472 O_NUMBER, -1, &swindow, NULL,
473 {
474 "Scroll window size: ",
475 "Scroll window size is %d lines",
476 NULL
477 }
478 },
479 { '"', "e_optname,
480 O_STRING, 0, NULL, opt_quote,
481 { "quotes: ", "s", NULL }
482 },
483 { '~', &tilde_optname,
484 O_BOOL|O_REPAINT, OPT_ON, &twiddle, NULL,
485 {
486 "Don't show tildes after end of file",
487 "Show tildes after end of file",
488 NULL
489 }
490 },
491 { '?', &query_optname,
492 O_NOVAR, 0, NULL, opt_query,
493 { NULL, NULL, NULL }
494 },
495 { '#', £_optname,
496 O_STRING, 0, NULL, opt_shift,
497 {
498 "Horizontal shift: ",
499 ".d",
500 NULL
501 }
502 },
503 { OLETTER_NONE, &keypad_optname,
504 O_BOOL|O_NO_TOGGLE, OPT_OFF, &no_keypad, NULL,
505 {
506 "Use keypad mode",
507 "Don't use keypad mode",
508 NULL
509 }
510 },
511 { OLETTER_NONE, &oldbot_optname,
512 O_BOOL, OPT_OFF, &oldbot, NULL,
513 {
514 "Use new bottom of screen behavior",
515 "Use old bottom of screen behavior",
516 NULL
517 }
518 },
519 { OLETTER_NONE, &follow_optname,
520 O_BOOL, FOLLOW_DESC, &follow_mode, NULL,
521 {
522 "F command follows file descriptor",
523 "F command follows file name",
524 NULL
525 }
526 },
527 { OLETTER_NONE, &use_backslash_optname,
528 O_BOOL, OPT_OFF, &opt_use_backslash, NULL,
529 {
530 "Use backslash escaping in command line parameters",
531 "Don't use backslash escaping in command line parameters",
532 NULL
533 }
534 },
535 { OLETTER_NONE, &rscroll_optname,
536 O_STRING|O_REPAINT|O_INIT_HANDLER, 0, NULL, opt_rscroll,
537 { "rscroll character: ", "s", NULL }
538 },
539 { OLETTER_NONE, &nohistdups_optname,
540 O_BOOL, OPT_OFF, &no_hist_dups, NULL,
541 {
542 "Allow duplicates in history list",
543 "Remove duplicates from history list",
544 NULL
545 }
546 },
547 { OLETTER_NONE, &mousecap_optname,
548 O_TRIPLE, OPT_OFF, &mousecap, opt_mousecap,
549 {
550 "Ignore mouse input",
551 "Use the mouse for scrolling",
552 "Use the mouse for scrolling (reverse)"
553 }
554 },
555 { OLETTER_NONE, &wheel_lines_optname,
556 O_NUMBER|O_INIT_HANDLER, 0, &wheel_lines, opt_wheel_lines,
557 {
558 "Lines to scroll on mouse wheel: ",
559 "Scroll %d line(s) on mouse wheel",
560 NULL
561 }
562 },
563 { OLETTER_NONE, &perma_marks_optname,
564 O_BOOL, OPT_OFF, &perma_marks, NULL,
565 {
566 "Don't save marks in history file",
567 "Save marks in history file",
568 NULL
569 }
570 },
571 { OLETTER_NONE, &linenum_width_optname,
572 O_NUMBER|O_REPAINT, MIN_LINENUM_WIDTH, &linenum_width, opt_linenum_width,
573 {
574 "Line number width: ",
575 "Line number width is %d chars",
576 NULL
577 }
578 },
579 { OLETTER_NONE, &status_col_width_optname,
580 O_NUMBER|O_REPAINT, 2, &status_col_width, opt_status_col_width,
581 {
582 "Status column width: ",
583 "Status column width is %d chars",
584 NULL
585 }
586 },
587 { OLETTER_NONE, &incr_search_optname,
588 O_BOOL, OPT_OFF, &incr_search, NULL,
589 {
590 "Incremental search is off",
591 "Incremental search is on",
592 NULL
593 }
594 },
595 { OLETTER_NONE, &use_color_optname,
596 O_BOOL|O_REPAINT, OPT_OFF, &use_color, NULL,
597 {
598 "Don't use color",
599 "Use color",
600 NULL
601 }
602 },
603 { OLETTER_NONE, &want_filesize_optname,
604 O_BOOL|O_REPAINT, OPT_OFF, &want_filesize, opt_filesize,
605 {
606 "Don't get size of each file",
607 "Get size of each file",
608 NULL
609 }
610 },
611 { OLETTER_NONE, &status_line_optname,
612 O_BOOL|O_REPAINT, OPT_OFF, &status_line, NULL,
613 {
614 "Don't color each line with its status column color",
615 "Color each line with its status column color",
616 NULL
617 }
618 },
619 { OLETTER_NONE, &header_optname,
620 O_STRING|O_REPAINT, 0, NULL, opt_header,
621 { "Header lines: ", "d,", NULL }
622 },
623 { OLETTER_NONE, &no_paste_optname,
624 O_BOOL, OPT_OFF, &no_paste, opt_no_paste,
625 {
626 "Accept pasted input",
627 "Ignore pasted input",
628 NULL
629 }
630 },
631 { OLETTER_NONE, &form_feed_optname,
632 O_BOOL, OPT_OFF, &stop_on_form_feed, NULL,
633 {
634 "Don't stop on form feed",
635 "Stop on form feed",
636 NULL
637 }
638 },
639 { OLETTER_NONE, &no_edit_warn_optname,
640 O_BOOL, OPT_OFF, &no_edit_warn, NULL,
641 {
642 "Warn when editing a file opened via LESSOPEN",
643 "Don't warn when editing a file opened via LESSOPEN",
644 NULL
645 }
646 },
647 { OLETTER_NONE, &nonum_headers_optname,
648 O_BOOL|O_REPAINT, 0, &nonum_headers, NULL,
649 {
650 "Number header lines",
651 "Don't number header lines",
652 NULL
653 }
654 },
655 { OLETTER_NONE, &nosearch_headers_optname,
656 O_BOOL|O_HL_REPAINT, 0, NULL, opt_nosearch_headers,
657 {
658 NULL, NULL, NULL
659 }
660 },
661 { OLETTER_NONE, &nosearch_header_lines_optname,
662 O_BOOL|O_HL_REPAINT, 0, NULL, opt_nosearch_header_lines,
663 {
664 NULL, NULL, NULL
665 }
666 },
667 { OLETTER_NONE, &nosearch_header_cols_optname,
668 O_BOOL|O_HL_REPAINT, 0, NULL, opt_nosearch_header_cols,
669 {
670 NULL, NULL, NULL
671 }
672 },
673 { OLETTER_NONE, &redraw_on_quit_optname,
674 O_BOOL, OPT_OFF, &redraw_on_quit, NULL,
675 {
676 "Don't redraw screen when quitting",
677 "Redraw last screen when quitting",
678 NULL
679 }
680 },
681 { OLETTER_NONE, &search_type_optname,
682 O_STRING, 0, NULL, opt_search_type,
683 { "Search options: ", "s", NULL }
684 },
685 { OLETTER_NONE, &exit_F_on_close_optname,
686 O_BOOL, OPT_OFF, &exit_F_on_close, NULL,
687 {
688 "Don't exit F command when input closes",
689 "Exit F command when input closes",
690 NULL
691 }
692 },
693 { OLETTER_NONE, &no_vbell_optname,
694 O_BOOL, OPT_OFF, &no_vbell, NULL,
695 {
696 "Display visual bell",
697 "Don't display visual bell",
698 NULL
699 }
700 },
701 { OLETTER_NONE, &modelines_optname,
702 O_NUMBER, 0, &modelines, NULL,
703 {
704 "Lines to read looking for modelines: ",
705 "Read %d lines looking for modelines",
706 NULL
707 }
708 },
709 { OLETTER_NONE, &intr_optname,
710 O_STRING, 0, NULL, opt_intr,
711 { "interrupt character: ", "s", NULL }
712 },
713 { OLETTER_NONE, &wordwrap_optname,
714 O_BOOL|O_REPAINT, OPT_OFF, &wordwrap, NULL,
715 {
716 "Wrap lines at any character",
717 "Wrap lines at spaces",
718 NULL
719 }
720 },
721 { OLETTER_NONE, &show_preproc_error_optname,
722 O_BOOL, OPT_OFF, &show_preproc_error, NULL,
723 {
724 "Don't show error message if preprocessor fails",
725 "Show error message if preprocessor fails",
726 NULL
727 }
728 },
729 { OLETTER_NONE, &proc_backspace_optname,
730 O_TRIPLE|O_REPAINT|O_HL_REPAINT, OPT_OFF, &proc_backspace, NULL,
731 {
732 "Backspace handling is specified by the -U option",
733 "Display underline text in underline mode",
734 "Print backspaces as ^H"
735 }
736 },
737 { OLETTER_NONE, &proc_tab_optname,
738 O_TRIPLE|O_REPAINT|O_HL_REPAINT, OPT_OFF, &proc_tab, NULL,
739 {
740 "Tab handling is specified by the -U option",
741 "Expand tabs to spaces",
742 "Print tabs as ^I"
743 }
744 },
745 { OLETTER_NONE, &proc_return_optname,
746 O_TRIPLE|O_REPAINT|O_HL_REPAINT, OPT_OFF, &proc_return, NULL,
747 {
748 "Carriage return handling is specified by the -U option",
749 "Delete carriage return before newline",
750 "Print carriage return as ^M"
751 }
752 },
753 { OLETTER_NONE, &first_cmd_at_prompt_optname,
754 O_STRING|O_NO_TOGGLE|O_NO_QUERY, 0, NULL, opt_first_cmd_at_prompt,
755 { NULL, NULL, NULL }
756 },
757 { OLETTER_NONE, &match_shift_optname,
758 O_STRING|O_INIT_HANDLER, 0, NULL, opt_match_shift,
759 {
760 "Search match shift: ",
761 ".d",
762 NULL
763 }
764 },
765 #if LESSTEST
766 { OLETTER_NONE, &ttyin_name_optname,
767 O_STRING|O_NO_TOGGLE, 0, NULL, opt_ttyin_name,
768 {
769 NULL,
770 NULL,
771 NULL
772 }
773 },
774 #endif /*LESSTEST*/
775 { '\0', NULL, O_NOVAR, 0, NULL, NULL, { NULL, NULL, NULL } }
776 };
777
778
779 /*
780 * Initialize each option to its default value.
781 */
init_option(void)782 public void init_option(void)
783 {
784 struct loption *o;
785 constant char *p;
786
787 p = lgetenv("LESS_IS_MORE");
788 if (!isnullenv(p) && !(p[0] == '0' && p[1] == '\0'))
789 less_is_more = 1;
790
791 for (o = option; o->oletter != '\0'; o++)
792 {
793 /*
794 * Set each variable to its default.
795 */
796 if (o->ovar != NULL)
797 *(o->ovar) = o->odefault;
798 if (o->otype & O_INIT_HANDLER)
799 (*(o->ofunc))(INIT, (char *) NULL);
800 }
801 }
802
803 /*
804 * Find an option in the option table, given its option letter.
805 */
findopt(int c)806 public struct loption * findopt(int c)
807 {
808 struct loption *o;
809
810 for (o = option; o->oletter != '\0'; o++)
811 {
812 if (o->oletter == c)
813 return (o);
814 if ((o->otype & O_TRIPLE) && ASCII_TO_UPPER(o->oletter) == c)
815 return (o);
816 }
817 return (NULL);
818 }
819
820 /*
821 *
822 */
is_optchar(char c)823 static lbool is_optchar(char c)
824 {
825 if (ASCII_IS_UPPER(c))
826 return TRUE;
827 if (ASCII_IS_LOWER(c))
828 return TRUE;
829 if (c == '-')
830 return TRUE;
831 return FALSE;
832 }
833
834 /*
835 * Find an option in the option table, given its option name.
836 * p_optname is the (possibly partial) name to look for, and
837 * is updated to point after the matched name.
838 * p_oname if non-NULL is set to point to the full option name.
839 */
findopt_name(constant char ** p_optname,constant char ** p_oname,lbool * p_ambig)840 public struct loption * findopt_name(constant char **p_optname, constant char **p_oname, lbool *p_ambig)
841 {
842 constant char *optname = *p_optname;
843 struct loption *o;
844 struct optname *oname;
845 size_t len;
846 int uppercase;
847 struct loption *maxo = NULL;
848 struct optname *maxoname = NULL;
849 size_t maxlen = 0;
850 lbool ambig = FALSE;
851 lbool exact = FALSE;
852
853 /*
854 * Check all options.
855 */
856 for (o = option; o->oletter != '\0'; o++)
857 {
858 /*
859 * Check all names for this option.
860 */
861 for (oname = o->onames; oname != NULL; oname = oname->onext)
862 {
863 /*
864 * Try normal match first (uppercase == 0),
865 * then, then if it's a TRIPLE option,
866 * try uppercase match (uppercase == 1).
867 */
868 for (uppercase = 0; uppercase <= 1; uppercase++)
869 {
870 len = sprefix(optname, oname->oname, uppercase);
871 if (len == 0 || is_optchar(optname[len]))
872 {
873 /*
874 * We didn't use all of the option name.
875 */
876 continue;
877 }
878 if (!exact && len == maxlen)
879 /*
880 * Already had a partial match,
881 * and now there's another one that
882 * matches the same length.
883 */
884 ambig = TRUE;
885 else if (len > maxlen)
886 {
887 /*
888 * Found a better match than
889 * the one we had.
890 */
891 maxo = o;
892 maxoname = oname;
893 maxlen = len;
894 ambig = FALSE;
895 exact = (len == strlen(oname->oname));
896 }
897 if (!(o->otype & O_TRIPLE))
898 break;
899 }
900 }
901 }
902 if (p_ambig != NULL)
903 *p_ambig = ambig;
904 if (ambig)
905 {
906 /*
907 * Name matched more than one option.
908 */
909 return (NULL);
910 }
911 *p_optname = optname + maxlen;
912 if (p_oname != NULL)
913 *p_oname = maxoname == NULL ? NULL : maxoname->oname;
914 return (maxo);
915 }
916
917 /*
918 * Find all toggleable options whose names begin with a specified string.
919 * Return them in a space-separated string.
920 */
findopts_name(constant char * pfx)921 public char * findopts_name(constant char *pfx)
922 {
923 constant struct loption *o;
924 constant struct optname *oname;
925 struct xbuffer xbuf;
926 int uppercase;
927
928 xbuf_init(&xbuf);
929 for (o = option; o->oletter != '\0'; o++)
930 {
931 if (o->otype & O_NO_TOGGLE)
932 continue;
933 for (oname = o->onames; oname != NULL; oname = oname->onext)
934 {
935 for (uppercase = 0; uppercase <= 1; uppercase++)
936 {
937 size_t len = sprefix(pfx, oname->oname, uppercase);
938 if (len >= strlen(pfx))
939 {
940 constant char *np;
941 for (np = oname->oname; *np != '\0'; np++)
942 xbuf_add_char(&xbuf, uppercase && ASCII_IS_LOWER(*np) ? ASCII_TO_UPPER(*np) : *np);
943 xbuf_add_char(&xbuf, ' ');
944 }
945 if (!(o->otype & O_TRIPLE))
946 break;
947 }
948 }
949 }
950 xbuf_pop(&xbuf); /* remove final space */
951 xbuf_add_char(&xbuf, '\0');
952 return (char *) xbuf.data;
953 }
954