1 /*
2 * Copyright (C) 1984-2026 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 hilite_target; /* Hilite target line */
54 public int status_col; /* Display a status column */
55 public int use_lessopen; /* Use the LESSOPEN filter */
56 public int quit_on_intr; /* Quit on interrupt */
57 public int follow_mode; /* F cmd Follows file desc or file name? */
58 public int oldbot; /* Old bottom of screen behavior {{REMOVE}} */
59 public int opt_use_backslash; /* Use backslash escaping in option parsing */
60 public LWCHAR rscroll_char; /* Char which marks chopped lines with -S */
61 public int rscroll_attr; /* Attribute of rscroll_char */
62 public int no_hist_dups; /* Remove dups from history list */
63 public int emouse; /* Enabled mouse features */
64 public int mouse_reverse; /* Reverse mouse wheel scrolling direction */
65 public int xmouse; /* Old --mouse option, replaced by --emouse */
66 public int wheel_lines; /* Number of lines to scroll on mouse wheel scroll */
67 public int perma_marks; /* Save marks in history file */
68 public int linenum_width; /* Width of line numbers */
69 public int status_col_width; /* Width of status column */
70 public int incr_search; /* Incremental search */
71 public int use_color; /* Use UI color */
72 public int want_filesize; /* Scan to EOF if necessary to get file size */
73 public int status_line; /* Highlight entire marked lines */
74 public int header_lines; /* Freeze header lines at top of screen */
75 public int header_cols; /* Freeze header columns at left of screen */
76 public int nonum_headers; /* Don't give headers line numbers */
77 public int nosearch_header_lines = 0; /* Don't search in header lines */
78 public int nosearch_header_cols = 0; /* Don't search in header columns */
79 public int redraw_on_quit; /* Redraw last screen after term deinit */
80 public int def_search_type; /* */
81 public int exit_F_on_close; /* Exit F command when input closes */
82 public int modelines; /* Lines to read looking for modelines */
83 public int show_preproc_error; /* Display msg when preproc exits with error */
84 public int proc_backspace; /* Special handling of backspace */
85 public int proc_tab; /* Special handling of tab */
86 public int proc_return; /* Special handling of carriage return */
87 public int match_shift; /* Extra horizontal shift on search match */
88 public int no_paste; /* Don't accept pasted input */
89 public int no_edit_warn; /* Don't warn when editing a LESSOPENed file */
90 public int stop_on_form_feed; /* Stop scrolling on a line starting with form feed */
91 public int past_eof; /* Continue scrolling past EOF */
92 public long match_shift_fraction = NUM_FRAC_DENOM/2; /* 1/2 of screen width */
93 public char intr_char = CONTROL('X'); /* Char to interrupt reads */
94 public char *first_cmd_at_prompt = NULL; /* Command to exec before first prompt */
95 public char *autosave; /* Actions which do autosave of history file */
96 public char *end_prompt; /* Printed after clearing the prompt */
97 #if HILITE_SEARCH
98 public int hilite_search; /* Highlight matched search patterns? */
99 #endif
100
101 public int less_is_more = 0; /* Make compatible with POSIX more */
102
103 /*
104 * Long option names.
105 */
106 static struct optname a_optname = { "search-skip-screen", NULL };
107 static struct optname b_optname = { "buffers", NULL };
108 static struct optname B__optname = { "auto-buffers", NULL };
109 static struct optname c_optname = { "clear-screen", NULL };
110 static struct optname d_optname = { "dumb", NULL };
111 static struct optname D__optname = { "color", NULL };
112 static struct optname e_optname = { "quit-at-eof", NULL };
113 static struct optname f_optname = { "force", NULL };
114 static struct optname F__optname = { "quit-if-one-screen", NULL };
115 #if HILITE_SEARCH
116 static struct optname g_optname = { "hilite-search", NULL };
117 #endif
118 static struct optname h_optname = { "max-back-scroll", NULL };
119 static struct optname i_optname = { "ignore-case", NULL };
120 static struct optname j_optname = { "jump-target", NULL };
121 static struct optname J__optname = { "status-column", NULL };
122 #if USERFILE
123 static struct optname k_optname = { "lesskey-file", NULL };
124 #if HAVE_LESSKEYSRC
125 static struct optname ks_optname = { "lesskey-src", NULL };
126 static struct optname kc_optname = { "lesskey-content", NULL };
127 #endif /* HAVE_LESSKEYSRC */
128 #endif
129 static struct optname K__optname = { "quit-on-intr", NULL };
130 static struct optname L__optname = { "no-lessopen", NULL };
131 static struct optname m_optname = { "long-prompt", NULL };
132 static struct optname n_optname = { "line-numbers", NULL };
133 #if LOGFILE
134 static struct optname o_optname = { "log-file", NULL };
135 static struct optname O__optname = { "LOG-FILE", NULL };
136 #endif
137 static struct optname p_optname = { "pattern", NULL };
138 static struct optname P__optname = { "prompt", NULL };
139 static struct optname q2_optname = { "silent", NULL };
140 static struct optname q_optname = { "quiet", &q2_optname };
141 static struct optname r_optname = { "raw-control-chars", NULL };
142 static struct optname s_optname = { "squeeze-blank-lines", NULL };
143 static struct optname S__optname = { "chop-long-lines", NULL };
144 #if TAGS
145 static struct optname t_optname = { "tag", NULL };
146 static struct optname T__optname = { "tag-file", NULL };
147 #endif
148 static struct optname u_optname = { "underline-special", NULL };
149 static struct optname V__optname = { "version", NULL };
150 static struct optname w_optname = { "hilite-unread", NULL };
151 static struct optname x_optname = { "tabs", NULL };
152 static struct optname X__optname = { "no-init", NULL };
153 static struct optname y_optname = { "max-forw-scroll", NULL };
154 static struct optname z_optname = { "window", NULL };
155 static struct optname quote_optname = { "quotes", NULL };
156 static struct optname tilde_optname = { "tilde", NULL };
157 static struct optname query_optname = { "help", NULL };
158 static struct optname pound_optname = { "shift", NULL };
159 static struct optname keypad_optname = { "no-keypad", NULL };
160 static struct optname oldbot_optname = { "old-bot", NULL };
161 static struct optname follow_optname = { "follow-name", NULL };
162 static struct optname use_backslash_optname = { "use-backslash", NULL };
163 static struct optname rscroll_optname = { "rscroll", NULL };
164 static struct optname nohistdups_optname = { "no-histdups", NULL };
165 static struct optname mouse_optname = { "mouse", NULL };
166 static struct optname emouse_optname = { "emouse", NULL };
167 static struct optname mouse_reverse_optname = { "rmouse", NULL };
168 static struct optname wheel_lines_optname = { "wheel-lines", NULL };
169 static struct optname perma_marks_optname = { "save-marks", NULL };
170 static struct optname linenum_width_optname = { "line-num-width", NULL };
171 static struct optname status_col_width_optname = { "status-col-width", NULL };
172 static struct optname incr_search_optname = { "incsearch", NULL };
173 static struct optname use_color_optname = { "use-color", NULL };
174 static struct optname want_filesize_optname = { "file-size", NULL };
175 static struct optname status_line_optname = { "status-line", NULL };
176 static struct optname header_optname = { "header", NULL };
177 static struct optname no_paste_optname = { "no-paste", NULL };
178 static struct optname form_feed_optname = { "form-feed", NULL };
179 static struct optname past_eof_optname = { "past-eof", NULL };
180 static struct optname no_edit_warn_optname2 = { "no-warn-edit", NULL };
181 static struct optname no_edit_warn_optname = { "no-edit-warn", &no_edit_warn_optname2 };
182 static struct optname nonum_headers_optname = { "no-number-headers", NULL };
183 static struct optname nosearch_headers_optname = { "no-search-headers", NULL };
184 static struct optname nosearch_header_lines_optname = { "no-search-header-lines", NULL };
185 static struct optname nosearch_header_cols_optname = { "no-search-header-columns", NULL };
186 static struct optname redraw_on_quit_optname = { "redraw-on-quit", NULL };
187 static struct optname search_type_optname = { "search-options", NULL };
188 static struct optname exit_F_on_close_optname = { "exit-follow-on-close", NULL };
189 static struct optname modelines_optname = { "modelines", NULL };
190 static struct optname no_vbell_optname = { "no-vbell", NULL };
191 static struct optname intr_optname = { "intr", NULL };
192 static struct optname wordwrap_optname = { "wordwrap", NULL };
193 static struct optname show_preproc_error_optname = { "show-preproc-errors", NULL };
194 static struct optname proc_backspace_optname = { "proc-backspace", NULL };
195 static struct optname proc_tab_optname = { "proc-tab", NULL };
196 static struct optname proc_return_optname = { "proc-return", NULL };
197 static struct optname match_shift_optname = { "match-shift", NULL };
198 static struct optname first_cmd_at_prompt_optname = { "cmd", NULL };
199 static struct optname autosave_optname = { "autosave", NULL };
200 static struct optname hilite_target_optname = { "hilite-target", NULL };
201 static struct optname end_prompt_optname = { "end-prompt", NULL };
202 #if LESSTEST
203 static struct optname ttyin_name_optname = { "tty", NULL };
204 #endif /*LESSTEST*/
205
206
207 /*
208 * Table of all options and their semantics.
209 *
210 * For BOOL and TRIPLE options, odesc[0], odesc[1], odesc[2] are
211 * the description of the option when set to 0, 1 or 2, respectively.
212 * For NUMBER options, odesc[0] is the prompt to use when entering
213 * a new value, and odesc[1] is the description, which should contain
214 * one %d which is replaced by the value of the number.
215 * For STRING options, odesc[0] is the prompt to use when entering
216 * a new value, and odesc[1], if not NULL, is the set of characters
217 * that are valid in the string.
218 */
219 static struct loption option[] =
220 {
221 { 'a', &a_optname,
222 O_TRIPLE, OPT_ONPLUS, &how_search, NULL,
223 {
224 "Search includes displayed screen",
225 "Search skips displayed screen",
226 "Search includes all of displayed screen"
227 }
228 },
229
230 { 'b', &b_optname,
231 O_NUMBER|O_INIT_HANDLER, 64, &bufspace, opt_b,
232 {
233 "Max buffer space per file (K): ",
234 "Max buffer space per file: %dK",
235 NULL
236 }
237 },
238 { 'B', &B__optname,
239 O_BOOL, OPT_ON, &autobuf, NULL,
240 {
241 "Don't automatically allocate buffers",
242 "Automatically allocate buffers when needed",
243 NULL
244 }
245 },
246 { 'c', &c_optname,
247 O_TRIPLE, OPT_OFF, &top_scroll, NULL,
248 {
249 "Repaint by scrolling from bottom of screen",
250 "Repaint by painting from top of screen",
251 "Repaint by painting from top of screen"
252 }
253 },
254 { 'd', &d_optname,
255 O_BOOL|O_NO_TOGGLE, OPT_OFF, &know_dumb, NULL,
256 {
257 "Assume intelligent terminal",
258 "Assume dumb terminal",
259 NULL
260 }
261 },
262 { 'D', &D__optname,
263 O_STRING|O_REPAINT|O_NO_QUERY, 0, NULL, opt_D,
264 { "color desc: ", "s", NULL }
265 },
266 { 'e', &e_optname,
267 O_TRIPLE, OPT_OFF, &quit_at_eof, NULL,
268 {
269 "Don't quit at end-of-file",
270 "Quit at end-of-file",
271 "Quit immediately at end-of-file"
272 }
273 },
274 { 'f', &f_optname,
275 O_BOOL, OPT_OFF, &force_open, NULL,
276 {
277 "Open only regular files",
278 "Open even non-regular files",
279 NULL
280 }
281 },
282 { 'F', &F__optname,
283 O_BOOL, OPT_OFF, &quit_if_one_screen, NULL,
284 {
285 "Don't quit if end-of-file on first screen",
286 "Quit if end-of-file on first screen",
287 NULL
288 }
289 },
290 #if HILITE_SEARCH
291 { 'g', &g_optname,
292 O_TRIPLE|O_HL_REPAINT, OPT_ONPLUS, &hilite_search, NULL,
293 {
294 "Don't highlight search matches",
295 "Highlight matches for previous search only",
296 "Highlight all matches for previous search pattern",
297 }
298 },
299 #endif
300 { 'h', &h_optname,
301 O_NUMBER, -1, &back_scroll, NULL,
302 {
303 "Backwards scroll limit: ",
304 "Backwards scroll limit is %d lines",
305 NULL
306 }
307 },
308 { 'i', &i_optname,
309 O_TRIPLE|O_HL_REPAINT, OPT_OFF, &caseless, opt_i,
310 {
311 "Case is significant in searches",
312 "Ignore case in searches",
313 "Ignore case in searches and in patterns"
314 }
315 },
316 { 'j', &j_optname,
317 O_STRING, 0, NULL, opt_j,
318 {
319 "Target line: ",
320 "-.d",
321 NULL
322 }
323 },
324 { 'J', &J__optname,
325 O_BOOL|O_REPAINT, OPT_OFF, &status_col, NULL,
326 {
327 "Don't display a status column",
328 "Display a status column",
329 NULL
330 }
331 },
332 #if USERFILE
333 { 'k', &k_optname,
334 O_STRING|O_NO_TOGGLE|O_NO_QUERY, 0, NULL, opt_k,
335 { NULL, NULL, NULL }
336 },
337 #if HAVE_LESSKEYSRC
338 { OLETTER_NONE, &kc_optname,
339 O_STRING|O_NO_TOGGLE|O_NO_QUERY, 0, NULL, opt_kc,
340 { NULL, NULL, NULL }
341 },
342 { OLETTER_NONE, &ks_optname,
343 O_STRING|O_NO_TOGGLE|O_NO_QUERY, 0, NULL, opt_ks,
344 { NULL, NULL, NULL }
345 },
346 #endif /* HAVE_LESSKEYSRC */
347 #endif
348 { 'K', &K__optname,
349 O_BOOL, OPT_OFF, &quit_on_intr, NULL,
350 {
351 "Interrupt (ctrl-C) returns to prompt",
352 "Interrupt (ctrl-C) exits less",
353 NULL
354 }
355 },
356 { 'L', &L__optname,
357 O_BOOL, OPT_ON, &use_lessopen, NULL,
358 {
359 "Don't use the LESSOPEN filter",
360 "Use the LESSOPEN filter",
361 NULL
362 }
363 },
364 { 'm', &m_optname,
365 O_TRIPLE, OPT_OFF, &pr_type, NULL,
366 {
367 "Short prompt",
368 "Medium prompt",
369 "Long prompt"
370 }
371 },
372 { 'n', &n_optname,
373 O_TRIPLE|O_REPAINT, OPT_ON, &linenums, NULL,
374 {
375 "Don't use line numbers",
376 "Use line numbers",
377 "Constantly display line numbers"
378 }
379 },
380 #if LOGFILE
381 { 'o', &o_optname,
382 O_STRING, 0, NULL, opt_o,
383 { "log file: ", NULL, NULL }
384 },
385 { 'O', &O__optname,
386 O_STRING, 0, NULL, opt__O,
387 { "Log file: ", NULL, NULL }
388 },
389 #endif
390 { 'p', &p_optname,
391 O_STRING|O_NO_TOGGLE|O_NO_QUERY, 0, NULL, opt_p,
392 { NULL, NULL, NULL }
393 },
394 { 'P', &P__optname,
395 O_STRING, 0, NULL, opt__P,
396 { "prompt: ", NULL, NULL }
397 },
398 { 'q', &q_optname,
399 O_TRIPLE, OPT_OFF, &quiet, NULL,
400 {
401 "Ring the bell for errors AND at eof/bof",
402 "Ring the bell for errors but not at eof/bof",
403 "Never ring the bell"
404 }
405 },
406 { 'r', &r_optname,
407 O_TRIPLE|O_REPAINT, OPT_OFF, &ctldisp, NULL,
408 {
409 "Display control characters as ^X",
410 "Display control characters directly (not recommended)",
411 "Display ANSI sequences directly, other control characters as ^X"
412 }
413 },
414 { 's', &s_optname,
415 O_BOOL|O_REPAINT, OPT_OFF, &squeeze, NULL,
416 {
417 "Display all blank lines",
418 "Squeeze multiple blank lines",
419 NULL
420 }
421 },
422 { 'S', &S__optname,
423 O_BOOL|O_REPAINT, OPT_OFF, &chopline, opt__S,
424 {
425 "Fold long lines",
426 "Chop long lines",
427 NULL
428 }
429 },
430 #if TAGS
431 { 't', &t_optname,
432 O_STRING|O_NO_QUERY, 0, NULL, opt_t,
433 { "tag: ", NULL, NULL }
434 },
435 { 'T', &T__optname,
436 O_STRING, 0, NULL, opt__T,
437 { "tags file: ", NULL, NULL }
438 },
439 #endif
440 { 'u', &u_optname,
441 O_TRIPLE|O_REPAINT|O_HL_REPAINT, OPT_OFF, &bs_mode, NULL,
442 {
443 "Display underlined text in underline mode",
444 "Backspaces cause overstrike",
445 "Print backspace as ^H"
446 }
447 },
448 { 'V', &V__optname,
449 O_NOVAR, 0, NULL, opt__V,
450 { NULL, NULL, NULL }
451 },
452 { OLETTER_NONE, &hilite_target_optname,
453 O_BOOL, OPT_OFF, &hilite_target, opt_hilite_target,
454 {
455 "Don't highlight target line",
456 "Highlight target line",
457 NULL
458 }
459 },
460 { 'w', &w_optname,
461 O_TRIPLE|O_REPAINT, OPT_OFF, &show_attn, NULL,
462 {
463 "Don't highlight first unread line",
464 "Highlight first unread line after forward-screen",
465 "Highlight first unread line after any forward movement",
466 }
467 },
468 { 'x', &x_optname,
469 O_STRING|O_REPAINT, 0, NULL, opt_x,
470 {
471 "Tab stops: ",
472 "d,",
473 NULL
474 }
475 },
476 { 'X', &X__optname,
477 O_BOOL|O_NO_TOGGLE, OPT_OFF, &no_init, NULL,
478 {
479 "Send init/deinit strings to terminal",
480 "Don't use init/deinit strings",
481 NULL
482 }
483 },
484 { 'y', &y_optname,
485 O_NUMBER, -1, &forw_scroll, NULL,
486 {
487 "Forward scroll limit: ",
488 "Forward scroll limit is %d lines",
489 NULL
490 }
491 },
492 { 'z', &z_optname,
493 O_NUMBER|O_NEGOK, -1, &swindow, NULL,
494 {
495 "Scroll window size: ",
496 "Scroll window size is %d lines",
497 NULL
498 }
499 },
500 { '"', "e_optname,
501 O_STRING, 0, NULL, opt_quote,
502 { "quotes: ", "s", NULL }
503 },
504 { '~', &tilde_optname,
505 O_BOOL|O_REPAINT, OPT_ON, &twiddle, NULL,
506 {
507 "Don't show tildes after end of file",
508 "Show tildes after end of file",
509 NULL
510 }
511 },
512 { '?', &query_optname,
513 O_NOVAR, 0, NULL, opt_query,
514 { NULL, NULL, NULL }
515 },
516 { '#', £_optname,
517 O_STRING, 0, NULL, opt_shift,
518 {
519 "Horizontal shift: ",
520 ".d",
521 NULL
522 }
523 },
524 { OLETTER_NONE, &keypad_optname,
525 O_BOOL|O_NO_TOGGLE, OPT_OFF, &no_keypad, NULL,
526 {
527 "Use keypad mode",
528 "Don't use keypad mode",
529 NULL
530 }
531 },
532 { OLETTER_NONE, &oldbot_optname,
533 O_BOOL, OPT_OFF, &oldbot, NULL,
534 {
535 "Use new bottom of screen behavior",
536 "Use old bottom of screen behavior",
537 NULL
538 }
539 },
540 { OLETTER_NONE, &follow_optname,
541 O_BOOL, FOLLOW_DESC, &follow_mode, NULL,
542 {
543 "F command follows file descriptor",
544 "F command follows file name",
545 NULL
546 }
547 },
548 { OLETTER_NONE, &use_backslash_optname,
549 O_BOOL, OPT_OFF, &opt_use_backslash, NULL,
550 {
551 "Don't use backslash escaping in command line parameters",
552 "Use backslash escaping in command line parameters",
553 NULL
554 }
555 },
556 { OLETTER_NONE, &rscroll_optname,
557 O_STRING|O_REPAINT|O_INIT_HANDLER, 0, NULL, opt_rscroll,
558 { "rscroll character: ", "s", NULL }
559 },
560 { OLETTER_NONE, &nohistdups_optname,
561 O_BOOL, OPT_OFF, &no_hist_dups, NULL,
562 {
563 "Allow duplicates in history list",
564 "Remove duplicates from history list",
565 NULL
566 }
567 },
568 { OLETTER_NONE, &mouse_optname,
569 O_TRIPLE, OPT_OFF, &xmouse, opt_mouse,
570 {
571 "Ignore mouse input",
572 "Use the mouse for scrolling vertically",
573 "Use the mouse for scrolling vertically (reverse)"
574 }
575 },
576 { OLETTER_NONE, &emouse_optname,
577 O_STRING, 0, NULL, opt_emouse,
578 { "Mouse features: ", "s", NULL }
579 },
580 { OLETTER_NONE, &mouse_reverse_optname,
581 O_BOOL, OPT_OFF, &mouse_reverse, NULL,
582 {
583 "Normal mouse scroll direction",
584 "Reverse mouse scroll direction",
585 NULL
586 }
587 },
588 { OLETTER_NONE, &wheel_lines_optname,
589 O_NUMBER|O_INIT_HANDLER, 0, &wheel_lines, opt_wheel_lines,
590 {
591 "Lines to scroll on mouse wheel: ",
592 "Scroll %d line(s) on mouse wheel",
593 NULL
594 }
595 },
596 { OLETTER_NONE, &perma_marks_optname,
597 O_BOOL, OPT_OFF, &perma_marks, NULL,
598 {
599 "Don't save marks in history file",
600 "Save marks in history file",
601 NULL
602 }
603 },
604 { OLETTER_NONE, &linenum_width_optname,
605 O_NUMBER|O_REPAINT, MIN_LINENUM_WIDTH, &linenum_width, opt_linenum_width,
606 {
607 "Line number width: ",
608 "Line number width is %d chars",
609 NULL
610 }
611 },
612 { OLETTER_NONE, &status_col_width_optname,
613 O_NUMBER|O_REPAINT, 2, &status_col_width, opt_status_col_width,
614 {
615 "Status column width: ",
616 "Status column width is %d chars",
617 NULL
618 }
619 },
620 { OLETTER_NONE, &incr_search_optname,
621 O_BOOL, OPT_OFF, &incr_search, NULL,
622 {
623 "Incremental search is off",
624 "Incremental search is on",
625 NULL
626 }
627 },
628 { OLETTER_NONE, &use_color_optname,
629 O_BOOL|O_REPAINT, OPT_OFF, &use_color, NULL,
630 {
631 "Don't use color",
632 "Use color",
633 NULL
634 }
635 },
636 { OLETTER_NONE, &want_filesize_optname,
637 O_BOOL|O_REPAINT, OPT_OFF, &want_filesize, opt_filesize,
638 {
639 "Don't get size of each file",
640 "Get size of each file",
641 NULL
642 }
643 },
644 { OLETTER_NONE, &status_line_optname,
645 O_BOOL|O_REPAINT, OPT_OFF, &status_line, NULL,
646 {
647 "Line highlight applies to text only",
648 "Line highlight applies to entire width of screen",
649 NULL
650 }
651 },
652 { OLETTER_NONE, &header_optname,
653 O_STRING|O_REPAINT, 0, NULL, opt_header,
654 { "Header lines: ", "d,", NULL }
655 },
656 { OLETTER_NONE, &no_paste_optname,
657 O_BOOL, OPT_OFF, &no_paste, opt_no_paste,
658 {
659 "Accept pasted input",
660 "Ignore pasted input",
661 NULL
662 }
663 },
664 { OLETTER_NONE, &form_feed_optname,
665 O_BOOL, OPT_OFF, &stop_on_form_feed, NULL,
666 {
667 "Don't stop on form feed",
668 "Stop on form feed",
669 NULL
670 }
671 },
672 { OLETTER_NONE, &past_eof_optname,
673 O_BOOL, OPT_OFF, &past_eof, NULL,
674 {
675 "Stop scrolling at end of file",
676 "Don't stop scrolling at end of file",
677 NULL
678 }
679 },
680 { OLETTER_NONE, &no_edit_warn_optname,
681 O_BOOL, OPT_OFF, &no_edit_warn, NULL,
682 {
683 "Warn when editing a file opened via LESSOPEN",
684 "Don't warn when editing a file opened via LESSOPEN",
685 NULL
686 }
687 },
688 { OLETTER_NONE, &nonum_headers_optname,
689 O_BOOL|O_REPAINT, 0, &nonum_headers, NULL,
690 {
691 "Number header lines",
692 "Don't number header lines",
693 NULL
694 }
695 },
696 { OLETTER_NONE, &nosearch_headers_optname,
697 O_BOOL|O_HL_REPAINT, 0, NULL, opt_nosearch_headers,
698 {
699 NULL, NULL, NULL
700 }
701 },
702 { OLETTER_NONE, &nosearch_header_lines_optname,
703 O_BOOL|O_HL_REPAINT, 0, NULL, opt_nosearch_header_lines,
704 {
705 NULL, NULL, NULL
706 }
707 },
708 { OLETTER_NONE, &nosearch_header_cols_optname,
709 O_BOOL|O_HL_REPAINT, 0, NULL, opt_nosearch_header_cols,
710 {
711 NULL, NULL, NULL
712 }
713 },
714 { OLETTER_NONE, &redraw_on_quit_optname,
715 O_BOOL, OPT_OFF, &redraw_on_quit, NULL,
716 {
717 "Don't redraw screen when quitting",
718 "Redraw last screen when quitting",
719 NULL
720 }
721 },
722 { OLETTER_NONE, &search_type_optname,
723 O_STRING, 0, NULL, opt_search_type,
724 { "Search options: ", "s", NULL }
725 },
726 { OLETTER_NONE, &exit_F_on_close_optname,
727 O_BOOL, OPT_OFF, &exit_F_on_close, NULL,
728 {
729 "Don't exit F command when input closes",
730 "Exit F command when input closes",
731 NULL
732 }
733 },
734 { OLETTER_NONE, &no_vbell_optname,
735 O_BOOL, OPT_OFF, &no_vbell, NULL,
736 {
737 "Display visual bell",
738 "Don't display visual bell",
739 NULL
740 }
741 },
742 { OLETTER_NONE, &modelines_optname,
743 O_NUMBER, 0, &modelines, NULL,
744 {
745 "Lines to read looking for modelines: ",
746 "Read %d lines looking for modelines",
747 NULL
748 }
749 },
750 { OLETTER_NONE, &intr_optname,
751 O_STRING, 0, NULL, opt_intr,
752 { "interrupt character: ", "s", NULL }
753 },
754 { OLETTER_NONE, &wordwrap_optname,
755 O_BOOL|O_REPAINT, OPT_OFF, &wordwrap, NULL,
756 {
757 "Wrap lines at any character",
758 "Wrap lines at spaces",
759 NULL
760 }
761 },
762 { OLETTER_NONE, &show_preproc_error_optname,
763 O_BOOL, OPT_OFF, &show_preproc_error, NULL,
764 {
765 "Don't show error message if preprocessor fails",
766 "Show error message if preprocessor fails",
767 NULL
768 }
769 },
770 { OLETTER_NONE, &proc_backspace_optname,
771 O_TRIPLE|O_REPAINT|O_HL_REPAINT, OPT_OFF, &proc_backspace, NULL,
772 {
773 "Backspace handling is specified by the -U option",
774 "Display underline text in underline mode",
775 "Print backspaces as ^H"
776 }
777 },
778 { OLETTER_NONE, &proc_tab_optname,
779 O_TRIPLE|O_REPAINT|O_HL_REPAINT, OPT_OFF, &proc_tab, NULL,
780 {
781 "Tab handling is specified by the -U option",
782 "Expand tabs to spaces",
783 "Print tabs as ^I"
784 }
785 },
786 { OLETTER_NONE, &proc_return_optname,
787 O_TRIPLE|O_REPAINT|O_HL_REPAINT, OPT_OFF, &proc_return, NULL,
788 {
789 "Carriage return handling is specified by the -U option",
790 "Delete carriage return before newline",
791 "Print carriage return as ^M"
792 }
793 },
794 { OLETTER_NONE, &first_cmd_at_prompt_optname,
795 O_STRING|O_NO_TOGGLE|O_NO_QUERY, 0, NULL, opt_first_cmd_at_prompt,
796 { NULL, NULL, NULL }
797 },
798 { OLETTER_NONE, &match_shift_optname,
799 O_STRING|O_INIT_HANDLER, 0, NULL, opt_match_shift,
800 {
801 "Search match shift: ",
802 ".d",
803 NULL
804 }
805 },
806 { OLETTER_NONE, &autosave_optname,
807 O_STRING|O_INIT_HANDLER, 0, NULL, opt_autosave,
808 { "Autosave actions: ", "s", NULL }
809 },
810 { OLETTER_NONE, &end_prompt_optname,
811 O_STRING, 0, NULL, opt_end_prompt,
812 { "Print after prompt: ", "s", NULL }
813 },
814 #if LESSTEST
815 { OLETTER_NONE, &ttyin_name_optname,
816 O_STRING|O_NO_TOGGLE, 0, NULL, opt_ttyin_name,
817 {
818 NULL,
819 NULL,
820 NULL
821 }
822 },
823 #endif /*LESSTEST*/
824 { '\0', NULL, O_NOVAR, 0, NULL, NULL, { NULL, NULL, NULL } }
825 };
826
827
828 /*
829 * Initialize each option to its default value.
830 */
init_option(void)831 public void init_option(void)
832 {
833 struct loption *o;
834 constant char *p;
835
836 p = lgetenv("LESS_IS_MORE");
837 if (!isnullenv(p) && !(p[0] == '0' && p[1] == '\0'))
838 less_is_more = 1;
839
840 for (o = option; o->oletter != '\0'; o++)
841 {
842 /*
843 * Set each variable to its default.
844 */
845 if (o->ovar != NULL)
846 *(o->ovar) = o->odefault;
847 if (o->otype & O_INIT_HANDLER)
848 (*(o->ofunc))(INIT, (char *) NULL);
849 }
850 }
851
852 /*
853 * Find an option in the option table, given its option letter.
854 */
findopt(int c)855 public struct loption * findopt(int c)
856 {
857 struct loption *o;
858
859 for (o = option; o->oletter != '\0'; o++)
860 {
861 if (o->oletter == c)
862 return (o);
863 if ((o->otype & O_TRIPLE) && ASCII_TO_UPPER(o->oletter) == c)
864 return (o);
865 }
866 return (NULL);
867 }
868
869 /*
870 *
871 */
is_optchar(char c)872 static lbool is_optchar(char c)
873 {
874 if (ASCII_IS_UPPER(c))
875 return TRUE;
876 if (ASCII_IS_LOWER(c))
877 return TRUE;
878 if (c == '-')
879 return TRUE;
880 return FALSE;
881 }
882
883 /*
884 * Find an option in the option table, given its option name.
885 * p_optname is the (possibly partial) name to look for, and
886 * is updated to point after the matched name.
887 * p_oname if non-NULL is set to point to the full option name.
888 */
findopt_name(constant char ** p_optname,constant char ** p_oname,lbool * p_ambig)889 public struct loption * findopt_name(constant char **p_optname, constant char **p_oname, lbool *p_ambig)
890 {
891 constant char *optname = *p_optname;
892 struct loption *o;
893 struct optname *oname;
894 size_t len;
895 int uppercase;
896 struct loption *maxo = NULL;
897 struct optname *maxoname = NULL;
898 size_t maxlen = 0;
899 lbool ambig = FALSE;
900 lbool exact = FALSE;
901
902 /*
903 * Check all options.
904 */
905 for (o = option; o->oletter != '\0'; o++)
906 {
907 /*
908 * Check all names for this option.
909 */
910 for (oname = o->onames; oname != NULL; oname = oname->onext)
911 {
912 /*
913 * Try normal match first (uppercase == 0),
914 * then, then if it's a TRIPLE option,
915 * try uppercase match (uppercase == 1).
916 */
917 for (uppercase = 0; uppercase <= 1; uppercase++)
918 {
919 len = sprefix(optname, oname->oname, uppercase);
920 if (len == 0 || is_optchar(optname[len]))
921 {
922 /*
923 * We didn't use all of the option name.
924 */
925 continue;
926 }
927 if (!exact && len == maxlen)
928 /*
929 * Already had a partial match,
930 * and now there's another one that
931 * matches the same length.
932 */
933 ambig = TRUE;
934 else if (len > maxlen)
935 {
936 /*
937 * Found a better match than
938 * the one we had.
939 */
940 maxo = o;
941 maxoname = oname;
942 maxlen = len;
943 ambig = FALSE;
944 exact = (len == strlen(oname->oname));
945 }
946 if (!(o->otype & O_TRIPLE))
947 break;
948 }
949 }
950 }
951 if (p_ambig != NULL)
952 *p_ambig = ambig;
953 if (ambig)
954 {
955 /*
956 * Name matched more than one option.
957 */
958 return (NULL);
959 }
960 *p_optname = optname + maxlen;
961 if (p_oname != NULL)
962 *p_oname = maxoname == NULL ? NULL : maxoname->oname;
963 return (maxo);
964 }
965
966 /*
967 * Find all toggleable options whose names begin with a specified string.
968 * Return them in a space-separated string.
969 */
findopts_name(constant char * pfx)970 public char * findopts_name(constant char *pfx)
971 {
972 constant struct loption *o;
973 constant struct optname *oname;
974 struct xbuffer xbuf;
975 int uppercase;
976
977 xbuf_init(&xbuf);
978 for (o = option; o->oletter != '\0'; o++)
979 {
980 if (o->otype & O_NO_TOGGLE)
981 continue;
982 for (oname = o->onames; oname != NULL; oname = oname->onext)
983 {
984 for (uppercase = 0; uppercase <= 1; uppercase++)
985 {
986 size_t len = sprefix(pfx, oname->oname, uppercase);
987 if (len >= strlen(pfx))
988 {
989 constant char *np;
990 for (np = oname->oname; *np != '\0'; np++)
991 xbuf_add_char(&xbuf, uppercase && ASCII_IS_LOWER(*np) ? ASCII_TO_UPPER(*np) : *np);
992 xbuf_add_char(&xbuf, ' ');
993 }
994 if (!(o->otype & O_TRIPLE))
995 break;
996 }
997 }
998 }
999 xbuf_pop(&xbuf); /* remove final space */
1000 xbuf_add_char(&xbuf, '\0');
1001 return (char *) xbuf.data;
1002 }
1003