contrib/less-381/opttbl.c

   1 /*
   2  * Copyright (C) 1984-2002  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 about less, or for information on how to
   8  * contact the author, see the README file.
   9  */
  10
  11
  12 /*
  13  * The option table.
  14  */
  15
  16 #include "less.h"
  17 #include "option.h"
  18
  19 /*
  20  * Variables controlled by command line options.
  21  */
  22 public int quiet;               /* Should we suppress the audible 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 chopline;            /* Truncate displayed lines at screen width */
  44 public int no_init;             /* Disable sending ti/te termcap strings */
  45 public int no_keypad;           /* Disable sending ks/ke termcap strings */
  46 public int twiddle;             /* Show tildes after EOF */
  47 public int show_attn;           /* Hilite first unread line */
  48 public int shift_count;         /* Number of positions to shift horizontally */
  49 public int status_col;          /* Display a status column */
  50 public int use_lessopen;        /* Use the LESSOPEN filter */
  51 #if HILITE_SEARCH
  52 public int hilite_search;       /* Highlight matched search patterns? */
  53 #endif
  54
  55 /*
  56  * Long option names.
  57  */
  58 static struct optname a_optname      = { "search-skip-screen",   NULL };
  59 static struct optname b_optname      = { "buffers",              NULL };
  60 static struct optname B__optname     = { "auto-buffers",         NULL };
  61 static struct optname c_optname      = { "clear-screen",         NULL };
  62 static struct optname d_optname      = { "dumb",                 NULL };
  63 #if MSDOS_COMPILER
  64 static struct optname D__optname     = { "color",                NULL };
  65 #endif
  66 static struct optname e_optname      = { "quit-at-eof",          NULL };
  67 static struct optname f_optname      = { "force",                NULL };
  68 static struct optname F__optname     = { "quit-if-one-screen",   NULL };
  69 #if HILITE_SEARCH
  70 static struct optname g_optname      = { "hilite-search",        NULL };
  71 #endif
  72 static struct optname h_optname      = { "max-back-scroll",      NULL };
  73 static struct optname i_optname      = { "ignore-case",          NULL };
  74 static struct optname j_optname      = { "jump-target",          NULL };
  75 static struct optname J__optname     = { "status-column",        NULL };
  76 #if USERFILE
  77 static struct optname k_optname      = { "lesskey-file",         NULL };
  78 #endif
  79 static struct optname L__optname     = { "no-lessopen",          NULL };
  80 static struct optname m_optname      = { "long-prompt",          NULL };
  81 static struct optname n_optname      = { "line-numbers",         NULL };
  82 #if LOGFILE
  83 static struct optname o_optname      = { "log-file",             NULL };
  84 static struct optname O__optname     = { "LOG-FILE",             NULL };
  85 #endif
  86 static struct optname p_optname      = { "pattern",              NULL };
  87 static struct optname P__optname     = { "prompt",               NULL };
  88 static struct optname q2_optname     = { "silent",               NULL };
  89 static struct optname q_optname      = { "quiet",                &q2_optname };
  90 static struct optname r_optname      = { "raw-control-chars",    NULL };
  91 static struct optname s_optname      = { "squeeze-blank-lines",  NULL };
  92 static struct optname S__optname     = { "chop-long-lines",      NULL };
  93 #if TAGS
  94 static struct optname t_optname      = { "tag",                  NULL };
  95 static struct optname T__optname     = { "tag-file",             NULL };
  96 #endif
  97 static struct optname u_optname      = { "underline-special",    NULL };
  98 static struct optname V__optname     = { "version",              NULL };
  99 static struct optname w_optname      = { "hilite-unread",        NULL };
 100 static struct optname x_optname      = { "tabs",                 NULL };
 101 static struct optname X__optname     = { "no-init",              NULL };
 102 static struct optname y_optname      = { "max-forw-scroll",      NULL };
 103 static struct optname z_optname      = { "window",               NULL };
 104 static struct optname quote_optname  = { "quotes",               NULL };
 105 static struct optname tilde_optname  = { "tilde",                NULL };
 106 static struct optname query_optname  = { "help",                 NULL };
 107 static struct optname pound_optname  = { "shift",                NULL };
 108 static struct optname keypad_optname = { "no-keypad",            NULL };
 109
 110
 111 /*
 112  * Table of all options and their semantics.
 113  *
 114  * For BOOL and TRIPLE options, odesc[0], odesc[1], odesc[2] are
 115  * the description of the option when set to 0, 1 or 2, respectively.
 116  * For NUMBER options, odesc[0] is the prompt to use when entering
 117  * a new value, and odesc[1] is the description, which should contain
 118  * one %d which is replaced by the value of the number.
 119  * For STRING options, odesc[0] is the prompt to use when entering
 120  * a new value, and odesc[1], if not NULL, is the set of characters
 121  * that are valid in the string.
 122  */
 123 static struct loption option[] =
 124 {
 125         { 'a', &a_optname,
 126                 BOOL, OPT_OFF, &how_search, NULL,
 127                 {
 128                         "Search includes displayed screen",
 129                         "Search skips displayed screen",
 130                         NULL
 131                 }
 132         },
 133
 134         { 'b', &b_optname,
 135                 NUMBER|INIT_HANDLER, 64, &bufspace, opt_b,
 136                 {
 137                         "Max buffer space per file (K): ",
 138                         "Max buffer space per file: %dK",
 139                         NULL
 140                 }
 141         },
 142         { 'B', &B__optname,
 143                 BOOL, OPT_ON, &autobuf, NULL,
 144                 {
 145                         "Don't automatically allocate buffers",
 146                         "Automatically allocate buffers when needed",
 147                         NULL
 148                 }
 149         },
 150         { 'c', &c_optname,
 151                 TRIPLE, OPT_OFF, &top_scroll, NULL,
 152                 {
 153                         "Repaint by scrolling from bottom of screen",
 154                         "Repaint by clearing each line",
 155                         "Repaint by painting from top of screen"
 156                 }
 157         },
 158         { 'd', &d_optname,
 159                 BOOL|NO_TOGGLE, OPT_OFF, &know_dumb, NULL,
 160                 {
 161                         "Assume intelligent terminal",
 162                         "Assume dumb terminal",
 163                         NULL
 164                 }
 165         },
 166 #if MSDOS_COMPILER
 167         { 'D', &D__optname,
 168                 STRING|REPAINT|NO_QUERY, 0, NULL, opt_D,
 169                 {
 170                         "color desc: ",
 171                         "Ddknsu0123456789.",
 172                         NULL
 173                 }
 174         },
 175 #endif
 176         { 'e', &e_optname,
 177                 TRIPLE, OPT_OFF, &quit_at_eof, NULL,
 178                 {
 179                         "Don't quit at end-of-file",
 180                         "Quit at end-of-file",
 181                         "Quit immediately at end-of-file"
 182                 }
 183         },
 184         { 'f', &f_optname,
 185                 BOOL, OPT_OFF, &force_open, NULL,
 186                 {
 187                         "Open only regular files",
 188                         "Open even non-regular files",
 189                         NULL
 190                 }
 191         },
 192         { 'F', &F__optname,
 193                 BOOL, OPT_OFF, &quit_if_one_screen, NULL,
 194                 {
 195                         "Don't quit if end-of-file on first screen",
 196                         "Quit if end-of-file on first screen",
 197                         NULL
 198                 }
 199         },
 200 #if HILITE_SEARCH
 201         { 'g', &g_optname,
 202                 TRIPLE|HL_REPAINT, OPT_ONPLUS, &hilite_search, NULL,
 203                 {
 204                         "Don't highlight search matches",
 205                         "Highlight matches for previous search only",
 206                         "Highlight all matches for previous search pattern",
 207                 }
 208         },
 209 #endif
 210         { 'h', &h_optname,
 211                 NUMBER, -1, &back_scroll, NULL,
 212                 {
 213                         "Backwards scroll limit: ",
 214                         "Backwards scroll limit is %d lines",
 215                         NULL
 216                 }
 217         },
 218         { 'i', &i_optname,
 219                 TRIPLE|HL_REPAINT, OPT_OFF, &caseless, opt_i,
 220                 {
 221                         "Case is significant in searches",
 222                         "Ignore case in searches",
 223                         "Ignore case in searches and in patterns"
 224                 }
 225         },
 226         { 'j', &j_optname,
 227                 NUMBER, 1, &jump_sline, NULL,
 228                 {
 229                         "Target line: ",
 230                         "Position target at screen line %d",
 231                         NULL
 232                 }
 233         },
 234         { 'J', &J__optname,
 235                 BOOL|REPAINT, OPT_OFF, &status_col, NULL,
 236                 {
 237                         "Don't display a status column",
 238                         "Display a status column",
 239                         NULL
 240                 }
 241         },
 242 #if USERFILE
 243         { 'k', &k_optname,
 244                 STRING|NO_TOGGLE|NO_QUERY, 0, NULL, opt_k,
 245                 { NULL, NULL, NULL }
 246         },
 247 #endif
 248         { 'l', NULL,
 249                 STRING|NO_TOGGLE|NO_QUERY, 0, NULL, opt_l,
 250                 { NULL, NULL, NULL }
 251         },
 252         { 'L', &L__optname,
 253                 BOOL, OPT_ON, &use_lessopen, NULL,
 254                 {
 255                         "Don't use the LESSOPEN filter",
 256                         "Use the LESSOPEN filter",
 257                         NULL
 258                 }
 259         },
 260         { 'm', &m_optname,
 261                 TRIPLE, OPT_OFF, &pr_type, NULL,
 262                 {
 263                         "Short prompt",
 264                         "Medium prompt",
 265                         "Long prompt"
 266                 }
 267         },
 268         { 'n', &n_optname,
 269                 TRIPLE|REPAINT, OPT_ON, &linenums, NULL,
 270                 {
 271                         "Don't use line numbers",
 272                         "Use line numbers",
 273                         "Constantly display line numbers"
 274                 }
 275         },
 276 #if LOGFILE
 277         { 'o', &o_optname,
 278                 STRING, 0, NULL, opt_o,
 279                 { "log file: ", NULL, NULL }
 280         },
 281         { 'O', &O__optname,
 282                 STRING, 0, NULL, opt__O,
 283                 { "Log file: ", NULL, NULL }
 284         },
 285 #endif
 286         { 'p', &p_optname,
 287                 STRING|NO_TOGGLE|NO_QUERY, 0, NULL, opt_p,
 288                 { NULL, NULL, NULL }
 289         },
 290         { 'P', &P__optname,
 291                 STRING, 0, NULL, opt__P,
 292                 { "prompt: ", NULL, NULL }
 293         },
 294         { 'q', &q_optname,
 295                 TRIPLE, OPT_OFF, &quiet, NULL,
 296                 {
 297                         "Ring the bell for errors AND at eof/bof",
 298                         "Ring the bell for errors but not at eof/bof",
 299                         "Never ring the bell"
 300                 }
 301         },
 302         { 'r', &r_optname,
 303                 TRIPLE|REPAINT, OPT_OFF, &ctldisp, NULL,
 304                 {
 305                         "Display control characters as ^X",
 306                         "Display control characters directly",
 307                         "Display control characters directly, processing ANSI sequences"
 308                 }
 309         },
 310         { 's', &s_optname,
 311                 BOOL|REPAINT, OPT_OFF, &squeeze, NULL,
 312                 {
 313                         "Display all blank lines",
 314                         "Squeeze multiple blank lines",
 315                         NULL
 316                 }
 317         },
 318         { 'S', &S__optname,
 319                 BOOL|REPAINT, OPT_OFF, &chopline, NULL,
 320                 {
 321                         "Fold long lines",
 322                         "Chop long lines",
 323                         NULL
 324                 }
 325         },
 326 #if TAGS
 327         { 't', &t_optname,
 328                 STRING|NO_QUERY, 0, NULL, opt_t,
 329                 { "tag: ", NULL, NULL }
 330         },
 331         { 'T', &T__optname,
 332                 STRING, 0, NULL, opt__T,
 333                 { "tags file: ", NULL, NULL }
 334         },
 335 #endif
 336         { 'u', &u_optname,
 337                 TRIPLE|REPAINT, OPT_OFF, &bs_mode, NULL,
 338                 {
 339                         "Display underlined text in underline mode",
 340                         "Backspaces cause overstrike",
 341                         "Print backspace as ^H"
 342                 }
 343         },
 344         { 'V', &V__optname,
 345                 NOVAR, 0, NULL, opt__V,
 346                 { NULL, NULL, NULL }
 347         },
 348         { 'w', &w_optname,
 349                 TRIPLE|REPAINT, OPT_OFF, &show_attn, NULL,
 350                 {
 351                         "Don't highlight first unread line",
 352                         "Highlight first unread line after forward-screen",
 353                         "Highlight first unread line after any forward movement",
 354                 }
 355         },
 356         { 'x', &x_optname,
 357                 STRING|REPAINT, 0, NULL, opt_x,
 358                 {
 359                         "Tab stops: ",
 360                         "0123456789,",
 361                         NULL
 362                 }
 363         },
 364         { 'X', &X__optname,
 365                 BOOL|NO_TOGGLE, OPT_OFF, &no_init, NULL,
 366                 {
 367                         "Send init/deinit strings to terminal",
 368                         "Don't use init/deinit strings",
 369                         NULL
 370                 }
 371         },
 372         { 'y', &y_optname,
 373                 NUMBER, -1, &forw_scroll, NULL,
 374                 {
 375                         "Forward scroll limit: ",
 376                         "Forward scroll limit is %d lines",
 377                         NULL
 378                 }
 379         },
 380         { 'z', &z_optname,
 381                 NUMBER, -1, &swindow, NULL,
 382                 {
 383                         "Scroll window size: ",
 384                         "Scroll window size is %d lines",
 385                         NULL
 386                 }
 387         },
 388         { '"', &quote_optname,
 389                 STRING, 0, NULL, opt_quote,
 390                 { "quotes: ", NULL, NULL }
 391         },
 392         { '~', &tilde_optname,
 393                 BOOL|REPAINT, OPT_ON, &twiddle, NULL,
 394                 {
 395                         "Don't show tildes after end of file",
 396                         "Show tildes after end of file",
 397                         NULL
 398                 }
 399         },
 400         { '?', &query_optname,
 401                 NOVAR, 0, NULL, opt_query,
 402                 { NULL, NULL, NULL }
 403         },
 404         { '#', &pound_optname,
 405                 NUMBER, 0, &shift_count, NULL,
 406                 {
 407                         "Horizontal shift: ",
 408                         "Horizontal shift %d positions",
 409                         NULL
 410                 }
 411         },
 412         { '.', &keypad_optname,
 413                 BOOL|NO_TOGGLE, OPT_OFF, &no_keypad, NULL,
 414                 {
 415                         "Use keypad mode",
 416                         "Don't use keypad mode",
 417                         NULL
 418                 }
 419         },
 420         { '\0', NULL, NOVAR, 0, NULL, NULL, { NULL, NULL, NULL } }
 421 };
 422
 423
 424 /*
 425  * Initialize each option to its default value.
 426  */
 427         public void
 428 init_option()
 429 {
 430         register struct loption *o;
 431
 432         for (o = option;  o->oletter != '\0';  o++)
 433         {
 434                 /*
 435                  * Set each variable to its default.
 436                  */
 437                 if (o->ovar != NULL)
 438                         *(o->ovar) = o->odefault;
 439                 if (o->otype & INIT_HANDLER)
 440                         (*(o->ofunc))(INIT, (char *) NULL);
 441         }
 442 }
 443
 444 /*
 445  * Find an option in the option table, given its option letter.
 446  */
 447         public struct loption *
 448 findopt(c)
 449         int c;
 450 {
 451         register struct loption *o;
 452
 453         for (o = option;  o->oletter != '\0';  o++)
 454         {
 455                 if (o->oletter == c)
 456                         return (o);
 457                 if ((o->otype & TRIPLE) && toupper(o->oletter) == c)
 458                         return (o);
 459         }
 460         return (NULL);
 461 }
 462
 463 /*
 464  *
 465  */
 466         static int
 467 is_optchar(c)
 468         char c;
 469 {
 470         if (SIMPLE_IS_UPPER(c))
 471                 return 1;
 472         if (SIMPLE_IS_LOWER(c))
 473                 return 1;
 474         if (c == '-')
 475                 return 1;
 476         return 0;
 477 }
 478
 479 /*
 480  * Find an option in the option table, given its option name.
 481  * p_optname is the (possibly partial) name to look for, and
 482  * is updated to point after the matched name.
 483  * p_oname if non-NULL is set to point to the full option name.
 484  */
 485         public struct loption *
 486 findopt_name(p_optname, p_oname, p_err)
 487         char **p_optname;
 488         char **p_oname;
 489         int *p_err;
 490 {
 491         char *optname = *p_optname;
 492         register struct loption *o;
 493         register struct optname *oname;
 494         register int len;
 495         int uppercase;
 496         struct loption *maxo = NULL;
 497         struct optname *maxoname = NULL;
 498         int maxlen = 0;
 499         int ambig = 0;
 500         int exact = 0;
 501         char *eq;
 502
 503         /*
 504          * Check all options.
 505          */
 506         for (o = option;  o->oletter != '\0';  o++)
 507         {
 508                 /*
 509                  * Check all names for this option.
 510                  */
 511                 for (oname = o->onames;  oname != NULL;  oname = oname->onext)
 512                 {
 513                         /*
 514                          * Try normal match first (uppercase == 0),
 515                          * then, then if it's a TRIPLE option,
 516                          * try uppercase match (uppercase == 1).
 517                          */
 518                         for (uppercase = 0;  uppercase <= 1;  uppercase++)
 519                         {
 520                                 len = sprefix(optname, oname->oname, uppercase);
 521                                 if (len <= 0 || is_optchar(optname[len]))
 522                                 {
 523                                         /*
 524                                          * We didn't use all of the option name.
 525                                          */
 526                                         continue;
 527                                 }
 528                                 if (!exact && len == maxlen)
 529                                         /*
 530                                          * Already had a partial match,
 531                                          * and now there's another one that
 532                                          * matches the same length.
 533                                          */
 534                                         ambig = 1;
 535                                 else if (len > maxlen)
 536                                 {
 537                                         /*
 538                                          * Found a better match than
 539                                          * the one we had.
 540                                          */
 541                                         maxo = o;
 542                                         maxoname = oname;
 543                                         maxlen = len;
 544                                         ambig = 0;
 545                                         exact = (len == (int)strlen(oname->oname));
 546                                 }
 547                                 if (!(o->otype & TRIPLE))
 548                                         break;
 549                         }
 550                 }
 551         }
 552         if (ambig)
 553         {
 554                 /*
 555                  * Name matched more than one option.
 556                  */
 557                 if (p_err != NULL)
 558                         *p_err = OPT_AMBIG;
 559                 return (NULL);
 560         }
 561         *p_optname = optname + maxlen;
 562         if (p_oname != NULL)
 563                 *p_oname = maxoname == NULL ? NULL : maxoname->oname;
 564         return (maxo);
 565 }