2 * Copyright (C) 1984-2023 Mark Nudelman
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.
7 * For more information, see the README file.
12 * Handling functions for command line options.
14 * Most options are handled by the generic code in option.c.
15 * But all string options, and a few non-string options, require
16 * special handling specific to the particular option.
17 * This special processing is done by the "handling functions" in this file.
19 * Each handling function is passed a "type" and, if it is a string
20 * option, the string which should be "assigned" to the option.
21 * The type may be one of:
22 * INIT The option is being initialized from the command line.
23 * TOGGLE The option is being changed from within the program.
24 * QUERY The setting of the option is merely being queried.
33 extern int plusoption;
40 extern char openquote;
41 extern char closequote;
42 extern char *prproto[];
46 extern char *every_first_cmd;
47 extern IFILE curr_ifile;
48 extern char version[];
49 extern int jump_sline;
50 extern long jump_sline_fraction;
51 extern int shift_count;
52 extern long shift_count_fraction;
53 extern char rscroll_char;
54 extern int rscroll_attr;
56 extern int wheel_lines;
57 extern int less_is_more;
58 extern int linenum_width;
59 extern int status_col_width;
61 extern int want_filesize;
62 extern int header_lines;
63 extern int header_cols;
64 extern int def_search_type;
66 extern int tabstops[];
68 extern int tabdefault;
69 extern char intr_char;
71 extern char *namelogfile;
72 extern int force_logfile;
76 public char *tagoption = NULL;
81 extern char *ttyin_name;
84 extern int nm_fg_color, nm_bg_color;
85 extern int bo_fg_color, bo_bg_color;
86 extern int ul_fg_color, ul_bg_color;
87 extern int so_fg_color, so_bg_color;
88 extern int bl_fg_color, bl_bg_color;
90 #if MSDOS_COMPILER==WIN32C
91 #ifndef COMMON_LVB_UNDERSCORE
92 #define COMMON_LVB_UNDERSCORE 0x8000
100 * Handler for -o option.
102 public void opt_o(int type, char *s)
109 error("log file support is not available", NULL_PARG);
115 namelogfile = save(s);
118 if (ch_getflags() & CH_CANSEEK)
120 error("Input is not a pipe", NULL_PARG);
125 error("Log file is already in use", NULL_PARG);
129 if (namelogfile != NULL)
132 namelogfile = shell_unquote(filename);
134 use_logfile(namelogfile);
139 error("No log file", NULL_PARG);
142 parg.p_string = namelogfile;
143 error("Log file \"%s\"", &parg);
150 * Handler for -O option.
152 public void opt__O(int type, char *s)
154 force_logfile = TRUE;
160 * Handlers for -j option.
162 public void opt_j(int type, char *s)
175 jump_sline_fraction = getfraction(&s, "j", &err);
177 error("Invalid line fraction", NULL_PARG);
182 int sline = getnum(&s, "j", &err);
184 error("Invalid line number", NULL_PARG);
188 jump_sline_fraction = -1;
193 if (jump_sline_fraction < 0)
195 parg.p_int = jump_sline;
196 error("Position target at screen line %d", &parg);
199 char buf[INT_STRLEN_BOUND(long)+2];
200 SNPRINTF1(buf, sizeof(buf), ".%06ld", jump_sline_fraction);
201 len = (int) strlen(buf);
202 while (len > 2 && buf[len-1] == '0')
206 error("Position target at screen position %s", &parg);
212 public void calc_jump_sline(void)
214 if (jump_sline_fraction < 0)
216 jump_sline = (int) muldiv(sc_height, jump_sline_fraction, NUM_FRAC_DENOM);
220 * Handlers for -# option.
222 public void opt_shift(int type, char *s)
235 shift_count_fraction = getfraction(&s, "#", &err);
237 error("Invalid column fraction", NULL_PARG);
242 int hs = getnum(&s, "#", &err);
244 error("Invalid column number", NULL_PARG);
248 shift_count_fraction = -1;
253 if (shift_count_fraction < 0)
255 parg.p_int = shift_count;
256 error("Horizontal shift %d columns", &parg);
259 char buf[INT_STRLEN_BOUND(long)+2];
260 SNPRINTF1(buf, sizeof(buf), ".%06ld", shift_count_fraction);
261 len = (int) strlen(buf);
262 while (len > 2 && buf[len-1] == '0')
266 error("Horizontal shift %s of screen width", &parg);
272 public void calc_shift_count(void)
274 if (shift_count_fraction < 0)
276 shift_count = (int) muldiv(sc_width, shift_count_fraction, NUM_FRAC_DENOM);
280 public void opt_k(int type, char *s)
290 error("Cannot use lesskey file \"%s\"", &parg);
297 public void opt_ks(int type, char *s)
304 if (lesskey_src(s, 0))
307 error("Cannot use lesskey source file \"%s\"", &parg);
312 #endif /* HAVE_LESSKEYSRC */
313 #endif /* USERFILE */
317 * Handler for -t option.
319 public void opt_t(int type, char *s)
328 /* Do the rest in main() */
333 error("tags support is not available", NULL_PARG);
337 save_ifile = save_curr_ifile();
339 * Try to open the file containing the tag
340 * and search for the tag in that file.
342 if (edit_tagfile() || (pos = tagsearch()) == NULL_POSITION)
344 /* Failed: reopen the old file. */
345 reedit_ifile(save_ifile);
348 unsave_ifile(save_ifile);
349 jump_loc(pos, jump_sline);
355 * Handler for -T option.
357 public void opt__T(int type, char *s)
369 if (tags != NULL && tags != ztags)
372 tags = shell_unquote(filename);
376 parg.p_string = tags;
377 error("Tags file \"%s\"", &parg);
384 * Handler for -p option.
386 public void opt_p(int type, char *s)
392 * Unget a command for the specified string.
397 * In "more" mode, the -p argument is a command,
398 * not a search string, so we don't need a slash.
400 every_first_cmd = save(s);
405 * {{ This won't work if the "/" command is
406 * changed or invalidated by a .lesskey file. }}
410 ungetcc_back(CHAR_END_COMMAND);
417 * Handler for -P option.
419 public void opt__P(int type, char *s)
429 * Figure out which prototype string should be changed.
433 case 's': proto = &prproto[PR_SHORT]; s++; break;
434 case 'm': proto = &prproto[PR_MEDIUM]; s++; break;
435 case 'M': proto = &prproto[PR_LONG]; s++; break;
436 case '=': proto = &eqproto; s++; break;
437 case 'h': proto = &hproto; s++; break;
438 case 'w': proto = &wproto; s++; break;
439 default: proto = &prproto[PR_SHORT]; break;
445 parg.p_string = prproto[pr_type];
452 * Handler for the -b option.
455 public void opt_b(int type, char *s)
462 * Set the new number of buffers.
464 ch_setbufspace(bufspace);
472 * Handler for the -i option.
475 public void opt_i(int type, char *s)
489 * Handler for the -V option.
492 public void opt__V(int type, char *s)
501 set_output(1); /* Force output to stdout per GNU standard for --version output. */
505 putstr(pattern_lib_name());
506 putstr(" regular expressions)\n");
508 char constant *copyright =
509 "Copyright (C) 1984-2023 Mark Nudelman\n\n";
512 if (version[strlen(version)-1] == 'x')
514 putstr("** This is an EXPERIMENTAL build of the 'less' software,\n");
515 putstr("** and may not function correctly.\n");
516 putstr("** Obtain release builds from the web page below.\n\n");
519 putstr("This build supports LESSTEST.\n");
521 putstr("less comes with NO WARRANTY, to the extent permitted by law.\n");
522 putstr("For information about the terms of redistribution,\n");
523 putstr("see the file named README in the less distribution.\n");
524 putstr("Home page: https://greenwoodsoftware.com/less\n");
532 * Parse an MSDOS color descriptor.
534 static void colordesc(char *s, int *fg_color, int *bg_color)
537 #if MSDOS_COMPILER==WIN32C
542 ul = COMMON_LVB_UNDERSCORE;
546 *fg_color = nm_fg_color | ul;
547 *bg_color = nm_bg_color;
552 if (parse_color(s, &fg, &bg) == CT_NULL)
556 error("Invalid color string \"%s\"", &p);
559 if (fg == CV_NOCHANGE)
561 if (bg == CV_NOCHANGE)
563 #if MSDOS_COMPILER==WIN32C
572 static int color_from_namechar(char namechar)
576 case 'B': return AT_COLOR_BIN;
577 case 'C': return AT_COLOR_CTRL;
578 case 'E': return AT_COLOR_ERROR;
579 case 'H': return AT_COLOR_HEADER;
580 case 'M': return AT_COLOR_MARK;
581 case 'N': return AT_COLOR_LINENUM;
582 case 'P': return AT_COLOR_PROMPT;
583 case 'R': return AT_COLOR_RSCROLL;
584 case 'S': return AT_COLOR_SEARCH;
585 case 'W': case 'A': return AT_COLOR_ATTN;
586 case 'n': return AT_NORMAL;
587 case 's': return AT_STANDOUT;
588 case 'd': return AT_BOLD;
589 case 'u': return AT_UNDERLINE;
590 case 'k': return AT_BLINK;
592 if (namechar >= '1' && namechar <= '0'+NUM_SEARCH_COLORS)
593 return AT_COLOR_SUBSEARCH(namechar-'0');
599 * Handler for the -D option.
602 public void opt_D(int type, char *s)
614 sgr_mode = !sgr_mode;
618 attr = color_from_namechar(s[0]);
622 error("Invalid color specifier '%c'", &p);
625 if (!use_color && (attr & AT_COLOR))
627 error("Set --use-color before changing colors", NULL_PARG);
632 if (!(attr & AT_COLOR))
637 colordesc(s, &nm_fg_color, &nm_bg_color);
640 colordesc(s, &bo_fg_color, &bo_bg_color);
643 colordesc(s, &ul_fg_color, &ul_bg_color);
646 colordesc(s, &bl_fg_color, &bl_bg_color);
649 colordesc(s, &so_fg_color, &so_bg_color);
654 at_enter(AT_STANDOUT);
659 if (set_color_map(attr, s) < 0)
662 error("Invalid color string \"%s\"", &p);
668 p.p_string = (sgr_mode) ? "on" : "off";
669 error("SGR mode is %s", &p);
677 public void set_tabs(char *s, int len)
681 /* Start at 1 because tabstops[0] is always zero. */
682 for (i = 1; i < TABSTOP_MAX; )
686 while (s < es && *s == ' ')
688 for (; s < es && *s >= '0' && *s <= '9'; s++)
690 v |= ckd_mul(&n, n, 10);
691 v |= ckd_add(&n, n, *s - '0');
693 if (!v && n > tabstops[i-1])
695 while (s < es && *s == ' ')
697 if (s == es || *s++ != ',')
703 tabdefault = tabstops[ntabstops-1] - tabstops[ntabstops-2];
707 * Handler for the -x option.
709 public void opt_x(int type, char *s)
711 char msg[60+((INT_STRLEN_BOUND(int)+1)*TABSTOP_MAX)];
719 set_tabs(s, strlen(s));
722 strcpy(msg, "Tab stops ");
725 for (i = 1; i < ntabstops; i++)
729 sprintf(msg+strlen(msg), "%d", tabstops[i]);
731 sprintf(msg+strlen(msg), " and then ");
733 sprintf(msg+strlen(msg), "every %d spaces",
743 * Handler for the -" option.
745 public void opt_quote(int type, char *s)
756 openquote = closequote = '\0';
759 if (s[1] != '\0' && s[2] != '\0')
761 error("-\" must be followed by 1 or 2 chars", NULL_PARG);
766 closequote = openquote;
775 error("quotes %s", &parg);
781 * Handler for the --rscroll option.
784 public void opt_rscroll(int type, char *s)
793 int attr = AT_STANDOUT;
794 setfmt(s, &fmt, &attr, "*s>", FALSE);
795 if (strcmp(fmt, "-") == 0)
800 rscroll_char = *fmt ? *fmt : '>';
801 rscroll_attr = attr|AT_COLOR_RSCROLL;
805 p.p_string = rscroll_char ? prchar(rscroll_char) : "-";
806 error("rscroll character is %s", &p);
812 * "-?" means display a help message.
813 * If from the command line, exit immediately.
816 public void opt_query(int type, char *s)
822 error("Use \"h\" for help", NULL_PARG);
830 * Handler for the --mouse option.
833 public void opt_mousecap(int type, char *s)
838 if (mousecap == OPT_OFF)
850 * Handler for the --wheel-lines option.
853 public void opt_wheel_lines(int type, char *s)
859 if (wheel_lines <= 0)
860 wheel_lines = default_wheel_lines();
868 * Handler for the --line-number-width option.
871 public void opt_linenum_width(int type, char *s)
879 if (linenum_width > MAX_LINENUM_WIDTH)
881 parg.p_int = MAX_LINENUM_WIDTH;
882 error("Line number width must not be larger than %d", &parg);
883 linenum_width = MIN_LINENUM_WIDTH;
892 * Handler for the --status-column-width option.
895 public void opt_status_col_width(int type, char *s)
903 if (status_col_width > MAX_STATUSCOL_WIDTH)
905 parg.p_int = MAX_STATUSCOL_WIDTH;
906 error("Status column width must not be larger than %d", &parg);
907 status_col_width = 2;
916 * Handler for the --file-size option.
919 public void opt_filesize(int type, char *s)
925 if (want_filesize && curr_ifile != NULL && ch_length() == NULL_POSITION)
934 * Handler for the --intr option.
937 public void opt_intr(int type, char *s)
946 if (intr_char == '^' && s[1] != '\0')
947 intr_char = CONTROL(s[1]);
950 p.p_string = prchar(intr_char);
951 error("interrupt character is %s", &p);
957 * Handler for the --header option.
960 public void opt_header(int type, char *s)
973 n = getnum(&s, "header", &err);
976 error("invalid number of lines", NULL_PARG);
984 n = getnum(&s, "header", &err);
986 error("invalid number of columns", NULL_PARG);
993 char buf[2*INT_STRLEN_BOUND(int)+2];
995 SNPRINTF2(buf, sizeof(buf), "%d,%d", header_lines, header_cols);
997 error("header (lines,columns) is %s", &parg);
1004 * Handler for the --search-options option.
1007 public void opt_search_type(int type, char *s)
1020 for (; *s != '\0'; s++)
1024 case 'E': case 'e': case CONTROL('E'): st |= SRCH_PAST_EOF; break;
1025 case 'F': case 'f': case CONTROL('F'): st |= SRCH_FIRST_FILE; break;
1026 case 'K': case 'k': case CONTROL('K'): st |= SRCH_NO_MOVE; break;
1027 case 'N': case 'n': case CONTROL('N'): st |= SRCH_NO_MATCH; break;
1028 case 'R': case 'r': case CONTROL('R'): st |= SRCH_NO_REGEX; break;
1029 case 'W': case 'w': case CONTROL('W'): st |= SRCH_WRAP; break;
1030 case '-': st = 0; break;
1033 if (*s >= '1' && *s <= '0'+NUM_SEARCH_COLORS)
1035 st |= SRCH_SUBSEARCH(*s-'0');
1039 error("invalid search option '%c'", &parg);
1043 def_search_type = norm_search_type(st);
1047 if (def_search_type & SRCH_PAST_EOF) *bp++ = 'E';
1048 if (def_search_type & SRCH_FIRST_FILE) *bp++ = 'F';
1049 if (def_search_type & SRCH_NO_MOVE) *bp++ = 'K';
1050 if (def_search_type & SRCH_NO_MATCH) *bp++ = 'N';
1051 if (def_search_type & SRCH_NO_REGEX) *bp++ = 'R';
1052 if (def_search_type & SRCH_WRAP) *bp++ = 'W';
1053 for (i = 1; i <= NUM_SEARCH_COLORS; i++)
1054 if (def_search_type & SRCH_SUBSEARCH(i))
1059 parg.p_string = buf;
1060 error("search options: %s", &parg);
1067 * Handler for the --tty option.
1070 public void opt_ttyin_name(int type, char *s)
1082 public int chop_line(void)
1084 return (chopline || header_cols > 0 || header_lines > 0);
1088 * Get the "screen window" size.
1090 public int get_swindow(void)
1094 return (sc_height - header_lines + swindow);