contrib/less/opttbl.c

   1 /*
   2  * Copyright (C) 1984-2017  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 how_search;          /* Where should forward searches start? */
  23 public int top_scroll;          /* Repaint screen from top?
  24                                    (alternative is scroll from bottom) */
  25 public int pr_type;             /* Type of prompt (short, medium, long) */
  26 public int bs_mode;             /* How to process backspaces */
  27 public int know_dumb;           /* Don't complain about dumb terminals */
  28 public int quit_at_eof;         /* Quit after hitting end of file twice */
  29 public int quit_if_one_screen;  /* Quit if EOF on first screen */
  30 public int squeeze;             /* Squeeze multiple blank lines into one */
  31 public int tabstop;             /* Tab settings */
  32 public int back_scroll;         /* Repaint screen on backwards movement */
  33 public int forw_scroll;         /* Repaint screen on forward movement */
  34 public int caseless;            /* Do "caseless" searches */
  35 public int linenums;            /* Use line numbers */
  36 public int autobuf;             /* Automatically allocate buffers as needed */
  37 public int bufspace;            /* Max buffer space per file (K) */
  38 public int ctldisp;             /* Send control chars to screen untranslated */
  39 public int force_open;          /* Open the file even if not regular file */
  40 public int swindow;             /* Size of scrolling window */
  41 public int jump_sline;          /* Screen line of "jump target" */
  42 public long jump_sline_fraction = -1;
  43 public long shift_count_fraction = -1;
  44 public int chopline;            /* Truncate displayed lines at screen width */
  45 public int no_init;             /* Disable sending ti/te termcap strings */
  46 public int no_keypad;           /* Disable sending ks/ke termcap strings */
  47 public int twiddle;             /* Show tildes after EOF */
  48 public int show_attn;           /* Hilite first unread line */
  49 public int shift_count;         /* Number of positions to shift horizontally */
  50 public int status_col;          /* Display a status column */
  51 public int use_lessopen;        /* Use the LESSOPEN filter */
  52 public int quit_on_intr;        /* Quit on interrupt */
  53 public int follow_mode;         /* F cmd Follows file desc or file name? */
  54 public int oldbot;              /* Old bottom of screen behavior {{REMOVE}} */
  55 public int opt_use_backslash;   /* Use backslash escaping in option parsing */
  56 public LWCHAR rscroll_char;     /* Char which marks chopped lines with -S */
  57 public int rscroll_attr;        /* Attribute of rscroll_char */
  58 #if HILITE_SEARCH
  59 public int hilite_search;       /* Highlight matched search patterns? */
  60 #endif
  61
  62 public int less_is_more = 0;    /* Make compatible with POSIX more */
  63
  64 /*
  65  * Long option names.
  66  */
  67 static struct optname a_optname      = { "search-skip-screen",   NULL };
  68 static struct optname b_optname      = { "buffers",              NULL };
  69 static struct optname B__optname     = { "auto-buffers",         NULL };
  70 static struct optname c_optname      = { "clear-screen",         NULL };
  71 static struct optname d_optname      = { "dumb",                 NULL };
  72 #if MSDOS_COMPILER
  73 static struct optname D__optname     = { "color",                NULL };
  74 #endif
  75 static struct optname e_optname      = { "quit-at-eof",          NULL };
  76 static struct optname f_optname      = { "force",                NULL };
  77 static struct optname F__optname     = { "quit-if-one-screen",   NULL };
  78 #if HILITE_SEARCH
  79 static struct optname g_optname      = { "hilite-search",        NULL };
  80 #endif
  81 static struct optname h_optname      = { "max-back-scroll",      NULL };
  82 static struct optname i_optname      = { "ignore-case",          NULL };
  83 static struct optname j_optname      = { "jump-target",          NULL };
  84 static struct optname J__optname     = { "status-column",        NULL };
  85 #if USERFILE
  86 static struct optname k_optname      = { "lesskey-file",         NULL };
  87 #endif
  88 static struct optname K__optname     = { "quit-on-intr",         NULL };
  89 static struct optname L__optname     = { "no-lessopen",          NULL };
  90 static struct optname m_optname      = { "long-prompt",          NULL };
  91 static struct optname n_optname      = { "line-numbers",         NULL };
  92 #if LOGFILE
  93 static struct optname o_optname      = { "log-file",             NULL };
  94 static struct optname O__optname     = { "LOG-FILE",             NULL };
  95 #endif
  96 static struct optname p_optname      = { "pattern",              NULL };
  97 static struct optname P__optname     = { "prompt",               NULL };
  98 static struct optname q2_optname     = { "silent",               NULL };
  99 static struct optname q_optname      = { "quiet",                &q2_optname };
 100 static struct optname r_optname      = { "raw-control-chars",    NULL };
 101 static struct optname s_optname      = { "squeeze-blank-lines",  NULL };
 102 static struct optname S__optname     = { "chop-long-lines",      NULL };
 103 #if TAGS
 104 static struct optname t_optname      = { "tag",                  NULL };
 105 static struct optname T__optname     = { "tag-file",             NULL };
 106 #endif
 107 static struct optname u_optname      = { "underline-special",    NULL };
 108 static struct optname V__optname     = { "version",              NULL };
 109 static struct optname w_optname      = { "hilite-unread",        NULL };
 110 static struct optname x_optname      = { "tabs",                 NULL };
 111 static struct optname X__optname     = { "no-init",              NULL };
 112 static struct optname y_optname      = { "max-forw-scroll",      NULL };
 113 static struct optname z_optname      = { "window",               NULL };
 114 static struct optname quote_optname  = { "quotes",               NULL };
 115 static struct optname tilde_optname  = { "tilde",                NULL };
 116 static struct optname query_optname  = { "help",                 NULL };
 117 static struct optname pound_optname  = { "shift",                NULL };
 118 static struct optname keypad_optname = { "no-keypad",            NULL };
 119 static struct optname oldbot_optname = { "old-bot",              NULL };
 120 static struct optname follow_optname = { "follow-name",          NULL };
 121 static struct optname use_backslash_optname = { "use-backslash", NULL };
 122 static struct optname rscroll_optname = { "rscroll", NULL };
 123
 124
 125 /*
 126  * Table of all options and their semantics.
 127  *
 128  * For BOOL and TRIPLE options, odesc[0], odesc[1], odesc[2] are
 129  * the description of the option when set to 0, 1 or 2, respectively.
 130  * For NUMBER options, odesc[0] is the prompt to use when entering
 131  * a new value, and odesc[1] is the description, which should contain
 132  * one %d which is replaced by the value of the number.
 133  * For STRING options, odesc[0] is the prompt to use when entering
 134  * a new value, and odesc[1], if not NULL, is the set of characters
 135  * that are valid in the string.
 136  */
 137 static struct loption option[] =
 138 {
 139         { 'a', &a_optname,
 140                 TRIPLE, OPT_ONPLUS, &how_search, NULL,
 141                 {
 142                         "Search includes displayed screen",
 143                         "Search skips displayed screen",
 144                         "Search includes all of displayed screen"
 145                 }
 146         },
 147
 148         { 'b', &b_optname,
 149                 NUMBER|INIT_HANDLER, 64, &bufspace, opt_b,
 150                 {
 151                         "Max buffer space per file (K): ",
 152                         "Max buffer space per file: %dK",
 153                         NULL
 154                 }
 155         },
 156         { 'B', &B__optname,
 157                 BOOL, OPT_ON, &autobuf, NULL,
 158                 {
 159                         "Don't automatically allocate buffers",
 160                         "Automatically allocate buffers when needed",
 161                         NULL
 162                 }
 163         },
 164         { 'c', &c_optname,
 165                 TRIPLE, OPT_OFF, &top_scroll, NULL,
 166                 {
 167                         "Repaint by scrolling from bottom of screen",
 168                         "Repaint by painting from top of screen",
 169                         "Repaint by painting from top of screen"
 170                 }
 171         },
 172         { 'd', &d_optname,
 173                 BOOL|NO_TOGGLE, OPT_OFF, &know_dumb, NULL,
 174                 {
 175                         "Assume intelligent terminal",
 176                         "Assume dumb terminal",
 177                         NULL
 178                 }
 179         },
 180 #if MSDOS_COMPILER
 181         { 'D', &D__optname,
 182                 STRING|REPAINT, 0, NULL, opt_D,
 183                 {
 184                         "color desc: ",
 185                         "Dadknsu0123456789.",
 186                         NULL
 187                 }
 188         },
 189 #endif
 190         { 'e', &e_optname,
 191                 TRIPLE, OPT_OFF, &quit_at_eof, NULL,
 192                 {
 193                         "Don't quit at end-of-file",
 194                         "Quit at end-of-file",
 195                         "Quit immediately at end-of-file"
 196                 }
 197         },
 198         { 'f', &f_optname,
 199                 BOOL, OPT_OFF, &force_open, NULL,
 200                 {
 201                         "Open only regular files",
 202                         "Open even non-regular files",
 203                         NULL
 204                 }
 205         },
 206         { 'F', &F__optname,
 207                 BOOL, OPT_OFF, &quit_if_one_screen, NULL,
 208                 {
 209                         "Don't quit if end-of-file on first screen",
 210                         "Quit if end-of-file on first screen",
 211                         NULL
 212                 }
 213         },
 214 #if HILITE_SEARCH
 215         { 'g', &g_optname,
 216                 TRIPLE|HL_REPAINT, OPT_ONPLUS, &hilite_search, NULL,
 217                 {
 218                         "Don't highlight search matches",
 219                         "Highlight matches for previous search only",
 220                         "Highlight all matches for previous search pattern",
 221                 }
 222         },
 223 #endif
 224         { 'h', &h_optname,
 225                 NUMBER, -1, &back_scroll, NULL,
 226                 {
 227                         "Backwards scroll limit: ",
 228                         "Backwards scroll limit is %d lines",
 229                         NULL
 230                 }
 231         },
 232         { 'i', &i_optname,
 233                 TRIPLE|HL_REPAINT, OPT_OFF, &caseless, opt_i,
 234                 {
 235                         "Case is significant in searches",
 236                         "Ignore case in searches",
 237                         "Ignore case in searches and in patterns"
 238                 }
 239         },
 240         { 'j', &j_optname,
 241                 STRING, 0, NULL, opt_j,
 242                 {
 243                         "Target line: ",
 244                         "0123456789.-",
 245                         NULL
 246                 }
 247         },
 248         { 'J', &J__optname,
 249                 BOOL|REPAINT, OPT_OFF, &status_col, NULL,
 250                 {
 251                         "Don't display a status column",
 252                         "Display a status column",
 253                         NULL
 254                 }
 255         },
 256 #if USERFILE
 257         { 'k', &k_optname,
 258                 STRING|NO_TOGGLE|NO_QUERY, 0, NULL, opt_k,
 259                 { NULL, NULL, NULL }
 260         },
 261 #endif
 262         { 'K', &K__optname,
 263                 BOOL, OPT_OFF, &quit_on_intr, NULL,
 264                 {
 265                         "Interrupt (ctrl-C) returns to prompt",
 266                         "Interrupt (ctrl-C) exits less",
 267                         NULL
 268                 }
 269         },
 270         { 'L', &L__optname,
 271                 BOOL, OPT_ON, &use_lessopen, NULL,
 272                 {
 273                         "Don't use the LESSOPEN filter",
 274                         "Use the LESSOPEN filter",
 275                         NULL
 276                 }
 277         },
 278         { 'm', &m_optname,
 279                 TRIPLE, OPT_OFF, &pr_type, NULL,
 280                 {
 281                         "Short prompt",
 282                         "Medium prompt",
 283                         "Long prompt"
 284                 }
 285         },
 286         { 'n', &n_optname,
 287                 TRIPLE|REPAINT, OPT_ON, &linenums, NULL,
 288                 {
 289                         "Don't use line numbers",
 290                         "Use line numbers",
 291                         "Constantly display line numbers"
 292                 }
 293         },
 294 #if LOGFILE
 295         { 'o', &o_optname,
 296                 STRING, 0, NULL, opt_o,
 297                 { "log file: ", NULL, NULL }
 298         },
 299         { 'O', &O__optname,
 300                 STRING, 0, NULL, opt__O,
 301                 { "Log file: ", NULL, NULL }
 302         },
 303 #endif
 304         { 'p', &p_optname,
 305                 STRING|NO_TOGGLE|NO_QUERY, 0, NULL, opt_p,
 306                 { NULL, NULL, NULL }
 307         },
 308         { 'P', &P__optname,
 309                 STRING, 0, NULL, opt__P,
 310                 { "prompt: ", NULL, NULL }
 311         },
 312         { 'q', &q_optname,
 313                 TRIPLE, OPT_OFF, &quiet, NULL,
 314                 {
 315                         "Ring the bell for errors AND at eof/bof",
 316                         "Ring the bell for errors but not at eof/bof",
 317                         "Never ring the bell"
 318                 }
 319         },
 320         { 'r', &r_optname,
 321                 TRIPLE|REPAINT, OPT_OFF, &ctldisp, NULL,
 322                 {
 323                         "Display control characters as ^X",
 324                         "Display control characters directly",
 325                         "Display control characters directly, processing ANSI sequences"
 326                 }
 327         },
 328         { 's', &s_optname,
 329                 BOOL|REPAINT, OPT_OFF, &squeeze, NULL,
 330                 {
 331                         "Display all blank lines",
 332                         "Squeeze multiple blank lines",
 333                         NULL
 334                 }
 335         },
 336         { 'S', &S__optname,
 337                 BOOL|REPAINT, OPT_OFF, &chopline, NULL,
 338                 {
 339                         "Fold long lines",
 340                         "Chop long lines",
 341                         NULL
 342                 }
 343         },
 344 #if TAGS
 345         { 't', &t_optname,
 346                 STRING|NO_QUERY, 0, NULL, opt_t,
 347                 { "tag: ", NULL, NULL }
 348         },
 349         { 'T', &T__optname,
 350                 STRING, 0, NULL, opt__T,
 351                 { "tags file: ", NULL, NULL }
 352         },
 353 #endif
 354         { 'u', &u_optname,
 355                 TRIPLE|REPAINT, OPT_OFF, &bs_mode, NULL,
 356                 {
 357                         "Display underlined text in underline mode",
 358                         "Backspaces cause overstrike",
 359                         "Print backspace as ^H"
 360                 }
 361         },
 362         { 'V', &V__optname,
 363                 NOVAR, 0, NULL, opt__V,
 364                 { NULL, NULL, NULL }
 365         },
 366         { 'w', &w_optname,
 367                 TRIPLE|REPAINT, OPT_OFF, &show_attn, NULL,
 368                 {
 369                         "Don't highlight first unread line",
 370                         "Highlight first unread line after forward-screen",
 371                         "Highlight first unread line after any forward movement",
 372                 }
 373         },
 374         { 'x', &x_optname,
 375                 STRING|REPAINT, 0, NULL, opt_x,
 376                 {
 377                         "Tab stops: ",
 378                         "0123456789,",
 379                         NULL
 380                 }
 381         },
 382         { 'X', &X__optname,
 383                 BOOL|NO_TOGGLE, OPT_OFF, &no_init, NULL,
 384                 {
 385                         "Send init/deinit strings to terminal",
 386                         "Don't use init/deinit strings",
 387                         NULL
 388                 }
 389         },
 390         { 'y', &y_optname,
 391                 NUMBER, -1, &forw_scroll, NULL,
 392                 {
 393                         "Forward scroll limit: ",
 394                         "Forward scroll limit is %d lines",
 395                         NULL
 396                 }
 397         },
 398         { 'z', &z_optname,
 399                 NUMBER, -1, &swindow, NULL,
 400                 {
 401                         "Scroll window size: ",
 402                         "Scroll window size is %d lines",
 403                         NULL
 404                 }
 405         },
 406         { '"', &quote_optname,
 407                 STRING, 0, NULL, opt_quote,
 408                 { "quotes: ", NULL, NULL }
 409         },
 410         { '~', &tilde_optname,
 411                 BOOL|REPAINT, OPT_ON, &twiddle, NULL,
 412                 {
 413                         "Don't show tildes after end of file",
 414                         "Show tildes after end of file",
 415                         NULL
 416                 }
 417         },
 418         { '?', &query_optname,
 419                 NOVAR, 0, NULL, opt_query,
 420                 { NULL, NULL, NULL }
 421         },
 422         { '#', &pound_optname,
 423                 STRING, 0, NULL, opt_shift,
 424                 {
 425                         "Horizontal shift: ",
 426                         "0123456789.",
 427                         NULL
 428                 }
 429         },
 430         { OLETTER_NONE, &keypad_optname,
 431                 BOOL|NO_TOGGLE, OPT_OFF, &no_keypad, NULL,
 432                 {
 433                         "Use keypad mode",
 434                         "Don't use keypad mode",
 435                         NULL
 436                 }
 437         },
 438         { OLETTER_NONE, &oldbot_optname,
 439                 BOOL, OPT_OFF, &oldbot, NULL,
 440                 {
 441                         "Use new bottom of screen behavior",
 442                         "Use old bottom of screen behavior",
 443                         NULL
 444                 }
 445         },
 446         { OLETTER_NONE, &follow_optname,
 447                 BOOL, FOLLOW_DESC, &follow_mode, NULL,
 448                 {
 449                         "F command follows file descriptor",
 450                         "F command follows file name",
 451                         NULL
 452                 }
 453         },
 454         { OLETTER_NONE, &use_backslash_optname,
 455                 BOOL, OPT_OFF, &opt_use_backslash, NULL,
 456                 {
 457                         "Use backslash escaping in command line parameters",
 458                         "Don't use backslash escaping in command line parameters",
 459                         NULL
 460                 }
 461         },
 462         { OLETTER_NONE, &rscroll_optname,
 463                 STRING|REPAINT|INIT_HANDLER, 0, NULL, opt_rscroll,
 464                 { "right scroll character: ", NULL, NULL }
 465         },
 466         { '\0', NULL, NOVAR, 0, NULL, NULL, { NULL, NULL, NULL } }
 467 };
 468
 469
 470 /*
 471  * Initialize each option to its default value.
 472  */
 473         public void
 474 init_option()
 475 {
 476         struct loption *o;
 477         char *p;
 478
 479         p = lgetenv("LESS_IS_MORE");
 480         if (p != NULL && *p != '\0')
 481                 less_is_more = 1;
 482
 483         for (o = option;  o->oletter != '\0';  o++)
 484         {
 485                 /*
 486                  * Set each variable to its default.
 487                  */
 488                 if (o->ovar != NULL)
 489                         *(o->ovar) = o->odefault;
 490                 if (o->otype & INIT_HANDLER)
 491                         (*(o->ofunc))(INIT, (char *) NULL);
 492         }
 493 }
 494
 495 /*
 496  * Find an option in the option table, given its option letter.
 497  */
 498         public struct loption *
 499 findopt(c)
 500         int c;
 501 {
 502         struct loption *o;
 503
 504         for (o = option;  o->oletter != '\0';  o++)
 505         {
 506                 if (o->oletter == c)
 507                         return (o);
 508                 if ((o->otype & TRIPLE) && ASCII_TO_UPPER(o->oletter) == c)
 509                         return (o);
 510         }
 511         return (NULL);
 512 }
 513
 514 /*
 515  *
 516  */
 517         static int
 518 is_optchar(c)
 519         char c;
 520 {
 521         if (ASCII_IS_UPPER(c))
 522                 return 1;
 523         if (ASCII_IS_LOWER(c))
 524                 return 1;
 525         if (c == '-')
 526                 return 1;
 527         return 0;
 528 }
 529
 530 /*
 531  * Find an option in the option table, given its option name.
 532  * p_optname is the (possibly partial) name to look for, and
 533  * is updated to point after the matched name.
 534  * p_oname if non-NULL is set to point to the full option name.
 535  */
 536         public struct loption *
 537 findopt_name(p_optname, p_oname, p_err)
 538         char **p_optname;
 539         char **p_oname;
 540         int *p_err;
 541 {
 542         char *optname = *p_optname;
 543         struct loption *o;
 544         struct optname *oname;
 545         int len;
 546         int uppercase;
 547         struct loption *maxo = NULL;
 548         struct optname *maxoname = NULL;
 549         int maxlen = 0;
 550         int ambig = 0;
 551         int exact = 0;
 552
 553         /*
 554          * Check all options.
 555          */
 556         for (o = option;  o->oletter != '\0';  o++)
 557         {
 558                 /*
 559                  * Check all names for this option.
 560                  */
 561                 for (oname = o->onames;  oname != NULL;  oname = oname->onext)
 562                 {
 563                         /*
 564                          * Try normal match first (uppercase == 0),
 565                          * then, then if it's a TRIPLE option,
 566                          * try uppercase match (uppercase == 1).
 567                          */
 568                         for (uppercase = 0;  uppercase <= 1;  uppercase++)
 569                         {
 570                                 len = sprefix(optname, oname->oname, uppercase);
 571                                 if (len <= 0 || is_optchar(optname[len]))
 572                                 {
 573                                         /*
 574                                          * We didn't use all of the option name.
 575                                          */
 576                                         continue;
 577                                 }
 578                                 if (!exact && len == maxlen)
 579                                         /*
 580                                          * Already had a partial match,
 581                                          * and now there's another one that
 582                                          * matches the same length.
 583                                          */
 584                                         ambig = 1;
 585                                 else if (len > maxlen)
 586                                 {
 587                                         /*
 588                                          * Found a better match than
 589                                          * the one we had.
 590                                          */
 591                                         maxo = o;
 592                                         maxoname = oname;
 593                                         maxlen = len;
 594                                         ambig = 0;
 595                                         exact = (len == (int)strlen(oname->oname));
 596                                 }
 597                                 if (!(o->otype & TRIPLE))
 598                                         break;
 599                         }
 600                 }
 601         }
 602         if (ambig)
 603         {
 604                 /*
 605                  * Name matched more than one option.
 606                  */
 607                 if (p_err != NULL)
 608                         *p_err = OPT_AMBIG;
 609                 return (NULL);
 610         }
 611         *p_optname = optname + maxlen;
 612         if (p_oname != NULL)
 613                 *p_oname = maxoname == NULL ? NULL : maxoname->oname;
 614         return (maxo);
 615 }