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 int jump_sline_arg;
44 public long jump_sline_fraction = -1;
45 public int shift_count; /* Number of positions to shift horizontally */
46 public long shift_count_fraction = -1;
47 public int chopline; /* Truncate displayed lines at screen width */
48 public int wordwrap; /* Wrap lines at space */
49 public int no_init; /* Disable sending ti/te termcap strings */
50 public int no_keypad; /* Disable sending ks/ke termcap strings */
51 public int twiddle; /* Show tildes after EOF */
52 public int show_attn; /* Hilite first unread line */
53 public int status_col; /* Display a status column */
54 public int use_lessopen; /* Use the LESSOPEN filter */
55 public int quit_on_intr; /* Quit on interrupt */
56 public int follow_mode; /* F cmd Follows file desc or file name? */
57 public int oldbot; /* Old bottom of screen behavior {{REMOVE}} */
58 public int opt_use_backslash; /* Use backslash escaping in option parsing */
59 public LWCHAR rscroll_char; /* Char which marks chopped lines with -S */
60 public int rscroll_attr; /* Attribute of rscroll_char */
61 public int no_hist_dups; /* Remove dups from history list */
62 public int mousecap; /* Allow mouse for scrolling */
63 public int wheel_lines; /* Number of lines to scroll on mouse wheel scroll */
64 public int perma_marks; /* Save marks in history file */
65 public int linenum_width; /* Width of line numbers */
66 public int status_col_width; /* Width of status column */
67 public int incr_search; /* Incremental search */
68 public int use_color; /* Use UI color */
69 public int want_filesize; /* Scan to EOF if necessary to get file size */
70 public int status_line; /* Highlight entire marked lines */
71 public int header_lines; /* Freeze header lines at top of screen */
72 public int header_cols; /* Freeze header columns at left of screen */
73 public int nonum_headers; /* Don't give headers line numbers */
74 public int nosearch_header_lines = 0; /* Don't search in header lines */
75 public int nosearch_header_cols = 0; /* Don't search in header columns */
76 public int redraw_on_quit; /* Redraw last screen after term deinit */
77 public int def_search_type; /* */
78 public int exit_F_on_close; /* Exit F command when input closes */
79 public int modelines; /* Lines to read looking for modelines */
80 public int show_preproc_error; /* Display msg when preproc exits with error */
81 public int proc_backspace; /* Special handling of backspace */
82 public int proc_tab; /* Special handling of tab */
83 public int proc_return; /* Special handling of carriage return */
84 public int match_shift; /* Extra horizontal shift on search match */
85 public int no_paste; /* Don't accept pasted input */
86 public int no_edit_warn; /* Don't warn when editing a LESSOPENed file */
87 public int stop_on_form_feed; /* Stop scrolling on a line starting with form feed */
88 public long match_shift_fraction = NUM_FRAC_DENOM/2; /* 1/2 of screen width */
89 public char intr_char = CONTROL('X'); /* Char to interrupt reads */
90 public char *first_cmd_at_prompt = NULL; /* Command to exec before first prompt */
91 public char *autosave; /* Actions which do autosave of history file */
92 #if HILITE_SEARCH
93 public int hilite_search; /* Highlight matched search patterns? */
94 #endif
95
96 public int less_is_more = 0; /* Make compatible with POSIX more */
97
98 /*
99 * Long option names.
100 */
101 static struct optname a_optname = { "search-skip-screen", NULL };
102 static struct optname b_optname = { "buffers", NULL };
103 static struct optname B__optname = { "auto-buffers", NULL };
104 static struct optname c_optname = { "clear-screen", NULL };
105 static struct optname d_optname = { "dumb", NULL };
106 static struct optname D__optname = { "color", NULL };
107 static struct optname e_optname = { "quit-at-eof", NULL };
108 static struct optname f_optname = { "force", NULL };
109 static struct optname F__optname = { "quit-if-one-screen", NULL };
110 #if HILITE_SEARCH
111 static struct optname g_optname = { "hilite-search", NULL };
112 #endif
113 static struct optname h_optname = { "max-back-scroll", NULL };
114 static struct optname i_optname = { "ignore-case", NULL };
115 static struct optname j_optname = { "jump-target", NULL };
116 static struct optname J__optname = { "status-column", NULL };
117 #if USERFILE
118 static struct optname k_optname = { "lesskey-file", NULL };
119 #if HAVE_LESSKEYSRC
120 static struct optname ks_optname = { "lesskey-src", NULL };
121 static struct optname kc_optname = { "lesskey-content", NULL };
122 #endif /* HAVE_LESSKEYSRC */
123 #endif
124 static struct optname K__optname = { "quit-on-intr", NULL };
125 static struct optname L__optname = { "no-lessopen", NULL };
126 static struct optname m_optname = { "long-prompt", NULL };
127 static struct optname n_optname = { "line-numbers", NULL };
128 #if LOGFILE
129 static struct optname o_optname = { "log-file", NULL };
130 static struct optname O__optname = { "LOG-FILE", NULL };
131 #endif
132 static struct optname p_optname = { "pattern", NULL };
133 static struct optname P__optname = { "prompt", NULL };
134 static struct optname q2_optname = { "silent", NULL };
135 static struct optname q_optname = { "quiet", &q2_optname };
136 static struct optname r_optname = { "raw-control-chars", NULL };
137 static struct optname s_optname = { "squeeze-blank-lines", NULL };
138 static struct optname S__optname = { "chop-long-lines", NULL };
139 #if TAGS
140 static struct optname t_optname = { "tag", NULL };
141 static struct optname T__optname = { "tag-file", NULL };
142 #endif
143 static struct optname u_optname = { "underline-special", NULL };
144 static struct optname V__optname = { "version", NULL };
145 static struct optname w_optname = { "hilite-unread", NULL };
146 static struct optname x_optname = { "tabs", NULL };
147 static struct optname X__optname = { "no-init", NULL };
148 static struct optname y_optname = { "max-forw-scroll", NULL };
149 static struct optname z_optname = { "window", NULL };
150 static struct optname quote_optname = { "quotes", NULL };
151 static struct optname tilde_optname = { "tilde", NULL };
152 static struct optname query_optname = { "help", NULL };
153 static struct optname pound_optname = { "shift", NULL };
154 static struct optname keypad_optname = { "no-keypad", NULL };
155 static struct optname oldbot_optname = { "old-bot", NULL };
156 static struct optname follow_optname = { "follow-name", NULL };
157 static struct optname use_backslash_optname = { "use-backslash", NULL };
158 static struct optname rscroll_optname = { "rscroll", NULL };
159 static struct optname nohistdups_optname = { "no-histdups", NULL };
160 static struct optname mousecap_optname = { "mouse", NULL };
161 static struct optname wheel_lines_optname = { "wheel-lines", NULL };
162 static struct optname perma_marks_optname = { "save-marks", NULL };
163 static struct optname linenum_width_optname = { "line-num-width", NULL };
164 static struct optname status_col_width_optname = { "status-col-width", NULL };
165 static struct optname incr_search_optname = { "incsearch", NULL };
166 static struct optname use_color_optname = { "use-color", NULL };
167 static struct optname want_filesize_optname = { "file-size", NULL };
168 static struct optname status_line_optname = { "status-line", NULL };
169 static struct optname header_optname = { "header", NULL };
170 static struct optname no_paste_optname = { "no-paste", NULL };
171 static struct optname form_feed_optname = { "form-feed", NULL };
172 static struct optname no_edit_warn_optname2 = { "no-warn-edit", NULL };
173 static struct optname no_edit_warn_optname = { "no-edit-warn", &no_edit_warn_optname2 };
174 static struct optname nonum_headers_optname = { "no-number-headers", NULL };
175 static struct optname nosearch_headers_optname = { "no-search-headers", NULL };
176 static struct optname nosearch_header_lines_optname = { "no-search-header-lines", NULL };
177 static struct optname nosearch_header_cols_optname = { "no-search-header-columns", NULL };
178 static struct optname redraw_on_quit_optname = { "redraw-on-quit", NULL };
179 static struct optname search_type_optname = { "search-options", NULL };
180 static struct optname exit_F_on_close_optname = { "exit-follow-on-close", NULL };
181 static struct optname modelines_optname = { "modelines", NULL };
182 static struct optname no_vbell_optname = { "no-vbell", NULL };
183 static struct optname intr_optname = { "intr", NULL };
184 static struct optname wordwrap_optname = { "wordwrap", NULL };
185 static struct optname show_preproc_error_optname = { "show-preproc-errors", NULL };
186 static struct optname proc_backspace_optname = { "proc-backspace", NULL };
187 static struct optname proc_tab_optname = { "proc-tab", NULL };
188 static struct optname proc_return_optname = { "proc-return", NULL };
189 static struct optname match_shift_optname = { "match-shift", NULL };
190 static struct optname first_cmd_at_prompt_optname = { "cmd", NULL };
191 static struct optname autosave_optname = { "autosave", NULL };
192 #if LESSTEST
193 static struct optname ttyin_name_optname = { "tty", NULL };
194 #endif /*LESSTEST*/
195
196
197 /*
198 * Table of all options and their semantics.
199 *
200 * For BOOL and TRIPLE options, odesc[0], odesc[1], odesc[2] are
201 * the description of the option when set to 0, 1 or 2, respectively.
202 * For NUMBER options, odesc[0] is the prompt to use when entering
203 * a new value, and odesc[1] is the description, which should contain
204 * one %d which is replaced by the value of the number.
205 * For STRING options, odesc[0] is the prompt to use when entering
206 * a new value, and odesc[1], if not NULL, is the set of characters
207 * that are valid in the string.
208 */
209 static struct loption option[] =
210 {
211 { 'a', &a_optname,
212 O_TRIPLE, OPT_ONPLUS, &how_search, NULL,
213 {
214 "Search includes displayed screen",
215 "Search skips displayed screen",
216 "Search includes all of displayed screen"
217 }
218 },
219
220 { 'b', &b_optname,
221 O_NUMBER|O_INIT_HANDLER, 64, &bufspace, opt_b,
222 {
223 "Max buffer space per file (K): ",
224 "Max buffer space per file: %dK",
225 NULL
226 }
227 },
228 { 'B', &B__optname,
229 O_BOOL, OPT_ON, &autobuf, NULL,
230 {
231 "Don't automatically allocate buffers",
232 "Automatically allocate buffers when needed",
233 NULL
234 }
235 },
236 { 'c', &c_optname,
237 O_TRIPLE, OPT_OFF, &top_scroll, NULL,
238 {
239 "Repaint by scrolling from bottom of screen",
240 "Repaint by painting from top of screen",
241 "Repaint by painting from top of screen"
242 }
243 },
244 { 'd', &d_optname,
245 O_BOOL|O_NO_TOGGLE, OPT_OFF, &know_dumb, NULL,
246 {
247 "Assume intelligent terminal",
248 "Assume dumb terminal",
249 NULL
250 }
251 },
252 { 'D', &D__optname,
253 O_STRING|O_REPAINT|O_NO_QUERY, 0, NULL, opt_D,
254 { "color desc: ", "s", NULL }
255 },
256 { 'e', &e_optname,
257 O_TRIPLE, OPT_OFF, &quit_at_eof, NULL,
258 {
259 "Don't quit at end-of-file",
260 "Quit at end-of-file",
261 "Quit immediately at end-of-file"
262 }
263 },
264 { 'f', &f_optname,
265 O_BOOL, OPT_OFF, &force_open, NULL,
266 {
267 "Open only regular files",
268 "Open even non-regular files",
269 NULL
270 }
271 },
272 { 'F', &F__optname,
273 O_BOOL, OPT_OFF, &quit_if_one_screen, NULL,
274 {
275 "Don't quit if end-of-file on first screen",
276 "Quit if end-of-file on first screen",
277 NULL
278 }
279 },
280 #if HILITE_SEARCH
281 { 'g', &g_optname,
282 O_TRIPLE|O_HL_REPAINT, OPT_ONPLUS, &hilite_search, NULL,
283 {
284 "Don't highlight search matches",
285 "Highlight matches for previous search only",
286 "Highlight all matches for previous search pattern",
287 }
288 },
289 #endif
290 { 'h', &h_optname,
291 O_NUMBER, -1, &back_scroll, NULL,
292 {
293 "Backwards scroll limit: ",
294 "Backwards scroll limit is %d lines",
295 NULL
296 }
297 },
298 { 'i', &i_optname,
299 O_TRIPLE|O_HL_REPAINT, OPT_OFF, &caseless, opt_i,
300 {
301 "Case is significant in searches",
302 "Ignore case in searches",
303 "Ignore case in searches and in patterns"
304 }
305 },
306 { 'j', &j_optname,
307 O_STRING, 0, NULL, opt_j,
308 {
309 "Target line: ",
310 "-.d",
311 NULL
312 }
313 },
314 { 'J', &J__optname,
315 O_BOOL|O_REPAINT, OPT_OFF, &status_col, NULL,
316 {
317 "Don't display a status column",
318 "Display a status column",
319 NULL
320 }
321 },
322 #if USERFILE
323 { 'k', &k_optname,
324 O_STRING|O_NO_TOGGLE|O_NO_QUERY, 0, NULL, opt_k,
325 { NULL, NULL, NULL }
326 },
327 #if HAVE_LESSKEYSRC
328 { OLETTER_NONE, &kc_optname,
329 O_STRING|O_NO_TOGGLE|O_NO_QUERY, 0, NULL, opt_kc,
330 { NULL, NULL, NULL }
331 },
332 { OLETTER_NONE, &ks_optname,
333 O_STRING|O_NO_TOGGLE|O_NO_QUERY, 0, NULL, opt_ks,
334 { NULL, NULL, NULL }
335 },
336 #endif /* HAVE_LESSKEYSRC */
337 #endif
338 { 'K', &K__optname,
339 O_BOOL, OPT_OFF, &quit_on_intr, NULL,
340 {
341 "Interrupt (ctrl-C) returns to prompt",
342 "Interrupt (ctrl-C) exits less",
343 NULL
344 }
345 },
346 { 'L', &L__optname,
347 O_BOOL, OPT_ON, &use_lessopen, NULL,
348 {
349 "Don't use the LESSOPEN filter",
350 "Use the LESSOPEN filter",
351 NULL
352 }
353 },
354 { 'm', &m_optname,
355 O_TRIPLE, OPT_OFF, &pr_type, NULL,
356 {
357 "Short prompt",
358 "Medium prompt",
359 "Long prompt"
360 }
361 },
362 { 'n', &n_optname,
363 O_TRIPLE|O_REPAINT, OPT_ON, &linenums, NULL,
364 {
365 "Don't use line numbers",
366 "Use line numbers",
367 "Constantly display line numbers"
368 }
369 },
370 #if LOGFILE
371 { 'o', &o_optname,
372 O_STRING, 0, NULL, opt_o,
373 { "log file: ", NULL, NULL }
374 },
375 { 'O', &O__optname,
376 O_STRING, 0, NULL, opt__O,
377 { "Log file: ", NULL, NULL }
378 },
379 #endif
380 { 'p', &p_optname,
381 O_STRING|O_NO_TOGGLE|O_NO_QUERY, 0, NULL, opt_p,
382 { NULL, NULL, NULL }
383 },
384 { 'P', &P__optname,
385 O_STRING, 0, NULL, opt__P,
386 { "prompt: ", NULL, NULL }
387 },
388 { 'q', &q_optname,
389 O_TRIPLE, OPT_OFF, &quiet, NULL,
390 {
391 "Ring the bell for errors AND at eof/bof",
392 "Ring the bell for errors but not at eof/bof",
393 "Never ring the bell"
394 }
395 },
396 { 'r', &r_optname,
397 O_TRIPLE|O_REPAINT, OPT_OFF, &ctldisp, NULL,
398 {
399 "Display control characters as ^X",
400 "Display control characters directly (not recommended)",
401 "Display ANSI sequences directly, other control characters as ^X"
402 }
403 },
404 { 's', &s_optname,
405 O_BOOL|O_REPAINT, OPT_OFF, &squeeze, NULL,
406 {
407 "Display all blank lines",
408 "Squeeze multiple blank lines",
409 NULL
410 }
411 },
412 { 'S', &S__optname,
413 O_BOOL|O_REPAINT, OPT_OFF, &chopline, opt__S,
414 {
415 "Fold long lines",
416 "Chop long lines",
417 NULL
418 }
419 },
420 #if TAGS
421 { 't', &t_optname,
422 O_STRING|O_NO_QUERY, 0, NULL, opt_t,
423 { "tag: ", NULL, NULL }
424 },
425 { 'T', &T__optname,
426 O_STRING, 0, NULL, opt__T,
427 { "tags file: ", NULL, NULL }
428 },
429 #endif
430 { 'u', &u_optname,
431 O_TRIPLE|O_REPAINT|O_HL_REPAINT, OPT_OFF, &bs_mode, NULL,
432 {
433 "Display underlined text in underline mode",
434 "Backspaces cause overstrike",
435 "Print backspace as ^H"
436 }
437 },
438 { 'V', &V__optname,
439 O_NOVAR, 0, NULL, opt__V,
440 { NULL, NULL, NULL }
441 },
442 { 'w', &w_optname,
443 O_TRIPLE|O_REPAINT, OPT_OFF, &show_attn, NULL,
444 {
445 "Don't highlight first unread line",
446 "Highlight first unread line after forward-screen",
447 "Highlight first unread line after any forward movement",
448 }
449 },
450 { 'x', &x_optname,
451 O_STRING|O_REPAINT, 0, NULL, opt_x,
452 {
453 "Tab stops: ",
454 "d,",
455 NULL
456 }
457 },
458 { 'X', &X__optname,
459 O_BOOL|O_NO_TOGGLE, OPT_OFF, &no_init, NULL,
460 {
461 "Send init/deinit strings to terminal",
462 "Don't use init/deinit strings",
463 NULL
464 }
465 },
466 { 'y', &y_optname,
467 O_NUMBER, -1, &forw_scroll, NULL,
468 {
469 "Forward scroll limit: ",
470 "Forward scroll limit is %d lines",
471 NULL
472 }
473 },
474 { 'z', &z_optname,
475 O_NUMBER, -1, &swindow, NULL,
476 {
477 "Scroll window size: ",
478 "Scroll window size is %d lines",
479 NULL
480 }
481 },
482 { '"', "e_optname,
483 O_STRING, 0, NULL, opt_quote,
484 { "quotes: ", "s", NULL }
485 },
486 { '~', &tilde_optname,
487 O_BOOL|O_REPAINT, OPT_ON, &twiddle, NULL,
488 {
489 "Don't show tildes after end of file",
490 "Show tildes after end of file",
491 NULL
492 }
493 },
494 { '?', &query_optname,
495 O_NOVAR, 0, NULL, opt_query,
496 { NULL, NULL, NULL }
497 },
498 { '#', £_optname,
499 O_STRING, 0, NULL, opt_shift,
500 {
501 "Horizontal shift: ",
502 ".d",
503 NULL
504 }
505 },
506 { OLETTER_NONE, &keypad_optname,
507 O_BOOL|O_NO_TOGGLE, OPT_OFF, &no_keypad, NULL,
508 {
509 "Use keypad mode",
510 "Don't use keypad mode",
511 NULL
512 }
513 },
514 { OLETTER_NONE, &oldbot_optname,
515 O_BOOL, OPT_OFF, &oldbot, NULL,
516 {
517 "Use new bottom of screen behavior",
518 "Use old bottom of screen behavior",
519 NULL
520 }
521 },
522 { OLETTER_NONE, &follow_optname,
523 O_BOOL, FOLLOW_DESC, &follow_mode, NULL,
524 {
525 "F command follows file descriptor",
526 "F command follows file name",
527 NULL
528 }
529 },
530 { OLETTER_NONE, &use_backslash_optname,
531 O_BOOL, OPT_OFF, &opt_use_backslash, NULL,
532 {
533 "Use backslash escaping in command line parameters",
534 "Don't use backslash escaping in command line parameters",
535 NULL
536 }
537 },
538 { OLETTER_NONE, &rscroll_optname,
539 O_STRING|O_REPAINT|O_INIT_HANDLER, 0, NULL, opt_rscroll,
540 { "rscroll character: ", "s", NULL }
541 },
542 { OLETTER_NONE, &nohistdups_optname,
543 O_BOOL, OPT_OFF, &no_hist_dups, NULL,
544 {
545 "Allow duplicates in history list",
546 "Remove duplicates from history list",
547 NULL
548 }
549 },
550 { OLETTER_NONE, &mousecap_optname,
551 O_TRIPLE, OPT_OFF, &mousecap, opt_mousecap,
552 {
553 "Ignore mouse input",
554 "Use the mouse for scrolling",
555 "Use the mouse for scrolling (reverse)"
556 }
557 },
558 { OLETTER_NONE, &wheel_lines_optname,
559 O_NUMBER|O_INIT_HANDLER, 0, &wheel_lines, opt_wheel_lines,
560 {
561 "Lines to scroll on mouse wheel: ",
562 "Scroll %d line(s) on mouse wheel",
563 NULL
564 }
565 },
566 { OLETTER_NONE, &perma_marks_optname,
567 O_BOOL, OPT_OFF, &perma_marks, NULL,
568 {
569 "Don't save marks in history file",
570 "Save marks in history file",
571 NULL
572 }
573 },
574 { OLETTER_NONE, &linenum_width_optname,
575 O_NUMBER|O_REPAINT, MIN_LINENUM_WIDTH, &linenum_width, opt_linenum_width,
576 {
577 "Line number width: ",
578 "Line number width is %d chars",
579 NULL
580 }
581 },
582 { OLETTER_NONE, &status_col_width_optname,
583 O_NUMBER|O_REPAINT, 2, &status_col_width, opt_status_col_width,
584 {
585 "Status column width: ",
586 "Status column width is %d chars",
587 NULL
588 }
589 },
590 { OLETTER_NONE, &incr_search_optname,
591 O_BOOL, OPT_OFF, &incr_search, NULL,
592 {
593 "Incremental search is off",
594 "Incremental search is on",
595 NULL
596 }
597 },
598 { OLETTER_NONE, &use_color_optname,
599 O_BOOL|O_REPAINT, OPT_OFF, &use_color, NULL,
600 {
601 "Don't use color",
602 "Use color",
603 NULL
604 }
605 },
606 { OLETTER_NONE, &want_filesize_optname,
607 O_BOOL|O_REPAINT, OPT_OFF, &want_filesize, opt_filesize,
608 {
609 "Don't get size of each file",
610 "Get size of each file",
611 NULL
612 }
613 },
614 { OLETTER_NONE, &status_line_optname,
615 O_BOOL|O_REPAINT, OPT_OFF, &status_line, NULL,
616 {
617 "Don't color each line with its status column color",
618 "Color each line with its status column color",
619 NULL
620 }
621 },
622 { OLETTER_NONE, &header_optname,
623 O_STRING|O_REPAINT, 0, NULL, opt_header,
624 { "Header lines: ", "d,", NULL }
625 },
626 { OLETTER_NONE, &no_paste_optname,
627 O_BOOL, OPT_OFF, &no_paste, opt_no_paste,
628 {
629 "Accept pasted input",
630 "Ignore pasted input",
631 NULL
632 }
633 },
634 { OLETTER_NONE, &form_feed_optname,
635 O_BOOL, OPT_OFF, &stop_on_form_feed, NULL,
636 {
637 "Don't stop on form feed",
638 "Stop on form feed",
639 NULL
640 }
641 },
642 { OLETTER_NONE, &no_edit_warn_optname,
643 O_BOOL, OPT_OFF, &no_edit_warn, NULL,
644 {
645 "Warn when editing a file opened via LESSOPEN",
646 "Don't warn when editing a file opened via LESSOPEN",
647 NULL
648 }
649 },
650 { OLETTER_NONE, &nonum_headers_optname,
651 O_BOOL|O_REPAINT, 0, &nonum_headers, NULL,
652 {
653 "Number header lines",
654 "Don't number header lines",
655 NULL
656 }
657 },
658 { OLETTER_NONE, &nosearch_headers_optname,
659 O_BOOL|O_HL_REPAINT, 0, NULL, opt_nosearch_headers,
660 {
661 NULL, NULL, NULL
662 }
663 },
664 { OLETTER_NONE, &nosearch_header_lines_optname,
665 O_BOOL|O_HL_REPAINT, 0, NULL, opt_nosearch_header_lines,
666 {
667 NULL, NULL, NULL
668 }
669 },
670 { OLETTER_NONE, &nosearch_header_cols_optname,
671 O_BOOL|O_HL_REPAINT, 0, NULL, opt_nosearch_header_cols,
672 {
673 NULL, NULL, NULL
674 }
675 },
676 { OLETTER_NONE, &redraw_on_quit_optname,
677 O_BOOL, OPT_OFF, &redraw_on_quit, NULL,
678 {
679 "Don't redraw screen when quitting",
680 "Redraw last screen when quitting",
681 NULL
682 }
683 },
684 { OLETTER_NONE, &search_type_optname,
685 O_STRING, 0, NULL, opt_search_type,
686 { "Search options: ", "s", NULL }
687 },
688 { OLETTER_NONE, &exit_F_on_close_optname,
689 O_BOOL, OPT_OFF, &exit_F_on_close, NULL,
690 {
691 "Don't exit F command when input closes",
692 "Exit F command when input closes",
693 NULL
694 }
695 },
696 { OLETTER_NONE, &no_vbell_optname,
697 O_BOOL, OPT_OFF, &no_vbell, NULL,
698 {
699 "Display visual bell",
700 "Don't display visual bell",
701 NULL
702 }
703 },
704 { OLETTER_NONE, &modelines_optname,
705 O_NUMBER, 0, &modelines, NULL,
706 {
707 "Lines to read looking for modelines: ",
708 "Read %d lines looking for modelines",
709 NULL
710 }
711 },
712 { OLETTER_NONE, &intr_optname,
713 O_STRING, 0, NULL, opt_intr,
714 { "interrupt character: ", "s", NULL }
715 },
716 { OLETTER_NONE, &wordwrap_optname,
717 O_BOOL|O_REPAINT, OPT_OFF, &wordwrap, NULL,
718 {
719 "Wrap lines at any character",
720 "Wrap lines at spaces",
721 NULL
722 }
723 },
724 { OLETTER_NONE, &show_preproc_error_optname,
725 O_BOOL, OPT_OFF, &show_preproc_error, NULL,
726 {
727 "Don't show error message if preprocessor fails",
728 "Show error message if preprocessor fails",
729 NULL
730 }
731 },
732 { OLETTER_NONE, &proc_backspace_optname,
733 O_TRIPLE|O_REPAINT|O_HL_REPAINT, OPT_OFF, &proc_backspace, NULL,
734 {
735 "Backspace handling is specified by the -U option",
736 "Display underline text in underline mode",
737 "Print backspaces as ^H"
738 }
739 },
740 { OLETTER_NONE, &proc_tab_optname,
741 O_TRIPLE|O_REPAINT|O_HL_REPAINT, OPT_OFF, &proc_tab, NULL,
742 {
743 "Tab handling is specified by the -U option",
744 "Expand tabs to spaces",
745 "Print tabs as ^I"
746 }
747 },
748 { OLETTER_NONE, &proc_return_optname,
749 O_TRIPLE|O_REPAINT|O_HL_REPAINT, OPT_OFF, &proc_return, NULL,
750 {
751 "Carriage return handling is specified by the -U option",
752 "Delete carriage return before newline",
753 "Print carriage return as ^M"
754 }
755 },
756 { OLETTER_NONE, &first_cmd_at_prompt_optname,
757 O_STRING|O_NO_TOGGLE|O_NO_QUERY, 0, NULL, opt_first_cmd_at_prompt,
758 { NULL, NULL, NULL }
759 },
760 { OLETTER_NONE, &match_shift_optname,
761 O_STRING|O_INIT_HANDLER, 0, NULL, opt_match_shift,
762 {
763 "Search match shift: ",
764 ".d",
765 NULL
766 }
767 },
768 { OLETTER_NONE, &autosave_optname,
769 O_STRING|O_INIT_HANDLER, 0, NULL, opt_autosave,
770 { "Autosave actions: ", "s", NULL }
771 },
772 #if LESSTEST
773 { OLETTER_NONE, &ttyin_name_optname,
774 O_STRING|O_NO_TOGGLE, 0, NULL, opt_ttyin_name,
775 {
776 NULL,
777 NULL,
778 NULL
779 }
780 },
781 #endif /*LESSTEST*/
782 { '\0', NULL, O_NOVAR, 0, NULL, NULL, { NULL, NULL, NULL } }
783 };
784
785
786 /*
787 * Initialize each option to its default value.
788 */
init_option(void)789 public void init_option(void)
790 {
791 struct loption *o;
792 constant char *p;
793
794 p = lgetenv("LESS_IS_MORE");
795 if (!isnullenv(p) && !(p[0] == '0' && p[1] == '\0'))
796 less_is_more = 1;
797
798 for (o = option; o->oletter != '\0'; o++)
799 {
800 /*
801 * Set each variable to its default.
802 */
803 if (o->ovar != NULL)
804 *(o->ovar) = o->odefault;
805 if (o->otype & O_INIT_HANDLER)
806 (*(o->ofunc))(INIT, (char *) NULL);
807 }
808 }
809
810 /*
811 * Find an option in the option table, given its option letter.
812 */
findopt(int c)813 public struct loption * findopt(int c)
814 {
815 struct loption *o;
816
817 for (o = option; o->oletter != '\0'; o++)
818 {
819 if (o->oletter == c)
820 return (o);
821 if ((o->otype & O_TRIPLE) && ASCII_TO_UPPER(o->oletter) == c)
822 return (o);
823 }
824 return (NULL);
825 }
826
827 /*
828 *
829 */
is_optchar(char c)830 static lbool is_optchar(char c)
831 {
832 if (ASCII_IS_UPPER(c))
833 return TRUE;
834 if (ASCII_IS_LOWER(c))
835 return TRUE;
836 if (c == '-')
837 return TRUE;
838 return FALSE;
839 }
840
841 /*
842 * Find an option in the option table, given its option name.
843 * p_optname is the (possibly partial) name to look for, and
844 * is updated to point after the matched name.
845 * p_oname if non-NULL is set to point to the full option name.
846 */
findopt_name(constant char ** p_optname,constant char ** p_oname,lbool * p_ambig)847 public struct loption * findopt_name(constant char **p_optname, constant char **p_oname, lbool *p_ambig)
848 {
849 constant char *optname = *p_optname;
850 struct loption *o;
851 struct optname *oname;
852 size_t len;
853 int uppercase;
854 struct loption *maxo = NULL;
855 struct optname *maxoname = NULL;
856 size_t maxlen = 0;
857 lbool ambig = FALSE;
858 lbool exact = FALSE;
859
860 /*
861 * Check all options.
862 */
863 for (o = option; o->oletter != '\0'; o++)
864 {
865 /*
866 * Check all names for this option.
867 */
868 for (oname = o->onames; oname != NULL; oname = oname->onext)
869 {
870 /*
871 * Try normal match first (uppercase == 0),
872 * then, then if it's a TRIPLE option,
873 * try uppercase match (uppercase == 1).
874 */
875 for (uppercase = 0; uppercase <= 1; uppercase++)
876 {
877 len = sprefix(optname, oname->oname, uppercase);
878 if (len == 0 || is_optchar(optname[len]))
879 {
880 /*
881 * We didn't use all of the option name.
882 */
883 continue;
884 }
885 if (!exact && len == maxlen)
886 /*
887 * Already had a partial match,
888 * and now there's another one that
889 * matches the same length.
890 */
891 ambig = TRUE;
892 else if (len > maxlen)
893 {
894 /*
895 * Found a better match than
896 * the one we had.
897 */
898 maxo = o;
899 maxoname = oname;
900 maxlen = len;
901 ambig = FALSE;
902 exact = (len == strlen(oname->oname));
903 }
904 if (!(o->otype & O_TRIPLE))
905 break;
906 }
907 }
908 }
909 if (p_ambig != NULL)
910 *p_ambig = ambig;
911 if (ambig)
912 {
913 /*
914 * Name matched more than one option.
915 */
916 return (NULL);
917 }
918 *p_optname = optname + maxlen;
919 if (p_oname != NULL)
920 *p_oname = maxoname == NULL ? NULL : maxoname->oname;
921 return (maxo);
922 }
923
924 /*
925 * Find all toggleable options whose names begin with a specified string.
926 * Return them in a space-separated string.
927 */
findopts_name(constant char * pfx)928 public char * findopts_name(constant char *pfx)
929 {
930 constant struct loption *o;
931 constant struct optname *oname;
932 struct xbuffer xbuf;
933 int uppercase;
934
935 xbuf_init(&xbuf);
936 for (o = option; o->oletter != '\0'; o++)
937 {
938 if (o->otype & O_NO_TOGGLE)
939 continue;
940 for (oname = o->onames; oname != NULL; oname = oname->onext)
941 {
942 for (uppercase = 0; uppercase <= 1; uppercase++)
943 {
944 size_t len = sprefix(pfx, oname->oname, uppercase);
945 if (len >= strlen(pfx))
946 {
947 constant char *np;
948 for (np = oname->oname; *np != '\0'; np++)
949 xbuf_add_char(&xbuf, uppercase && ASCII_IS_LOWER(*np) ? ASCII_TO_UPPER(*np) : *np);
950 xbuf_add_char(&xbuf, ' ');
951 }
952 if (!(o->otype & O_TRIPLE))
953 break;
954 }
955 }
956 }
957 xbuf_pop(&xbuf); /* remove final space */
958 xbuf_add_char(&xbuf, '\0');
959 return (char *) xbuf.data;
960 }
961