1 /* 2 * Copyright (C) 1984-2000 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 cbufs; /* Current number of buffers */ 38 public int autobuf; /* Automatically allocate buffers as needed */ 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 twiddle; /* Show tildes after EOF */ 46 public int show_attn; /* Hilite first unread line */ 47 public int shift_count; /* Number of positions to shift horizontally */ 48 public int status_col; /* Display a status column */ 49 #if HILITE_SEARCH 50 public int hilite_search; /* Highlight matched search patterns? */ 51 #endif 52 53 /* 54 * Long option names. 55 */ 56 static struct optname a_optname = { "search-skip-screen", NULL }; 57 static struct optname b_optname = { "buffers", NULL }; 58 static struct optname B__optname = { "auto-buffers", NULL }; 59 static struct optname c_optname = { "clear-screen", NULL }; 60 static struct optname d_optname = { "dumb", NULL }; 61 #if MSDOS_COMPILER 62 static struct optname D__optname = { "color", NULL }; 63 #endif 64 static struct optname e_optname = { "quit-at-eof", NULL }; 65 static struct optname f_optname = { "force", NULL }; 66 static struct optname F__optname = { "quit-if-one-screen", NULL }; 67 #if HILITE_SEARCH 68 static struct optname g_optname = { "hilite-search", NULL }; 69 #endif 70 static struct optname h_optname = { "max-back-scroll", NULL }; 71 static struct optname i_optname = { "ignore-case", NULL }; 72 static struct optname j_optname = { "jump-target", NULL }; 73 static struct optname J__optname = { "status-column", NULL }; 74 #if USERFILE 75 static struct optname k_optname = { "lesskey-file", NULL }; 76 #endif 77 static struct optname m_optname = { "long-prompt", NULL }; 78 static struct optname n_optname = { "line-numbers", NULL }; 79 #if LOGFILE 80 static struct optname o_optname = { "log-file", NULL }; 81 static struct optname O__optname = { "LOG-FILE", NULL }; 82 #endif 83 static struct optname p_optname = { "pattern", NULL }; 84 static struct optname P__optname = { "prompt", NULL }; 85 static struct optname q2_optname = { "silent", NULL }; 86 static struct optname q_optname = { "quiet", &q2_optname }; 87 static struct optname r_optname = { "raw-control-chars", NULL }; 88 static struct optname s_optname = { "squeeze-blank-lines", NULL }; 89 static struct optname S__optname = { "chop-long-lines", NULL }; 90 #if TAGS 91 static struct optname t_optname = { "tag", NULL }; 92 static struct optname T__optname = { "tag-file", NULL }; 93 #endif 94 static struct optname u_optname = { "underline-special", NULL }; 95 static struct optname V__optname = { "version", NULL }; 96 static struct optname w_optname = { "hilite-unread", NULL }; 97 static struct optname x_optname = { "tabs", NULL }; 98 static struct optname X__optname = { "no-init", NULL }; 99 static struct optname y_optname = { "max-forw-scroll", NULL }; 100 static struct optname z_optname = { "window", NULL }; 101 static struct optname quote_optname = { "quotes", NULL }; 102 static struct optname tilde_optname = { "tilde", NULL }; 103 static struct optname query_optname = { "help", NULL }; 104 static struct optname pound_optname = { "shift", NULL }; 105 106 107 /* 108 * Table of all options and their semantics. 109 */ 110 static struct option option[] = 111 { 112 { 'a', &a_optname, 113 BOOL, OPT_OFF, &how_search, NULL, 114 "Search includes displayed screen", 115 "Search skips displayed screen", 116 NULL 117 }, 118 119 { 'b', &b_optname, 120 NUMBER, 10, &cbufs, opt_b, 121 "Buffers: ", 122 "%d buffers", 123 NULL 124 }, 125 { 'B', &B__optname, 126 BOOL, OPT_ON, &autobuf, NULL, 127 "Don't automatically allocate buffers", 128 "Automatically allocate buffers when needed", 129 NULL 130 }, 131 { 'c', &c_optname, 132 TRIPLE, OPT_OFF, &top_scroll, NULL, 133 "Repaint by scrolling from bottom of screen", 134 "Repaint by clearing each line", 135 "Repaint by painting from top of screen" 136 }, 137 { 'd', &d_optname, 138 BOOL|NO_TOGGLE, OPT_OFF, &know_dumb, NULL, 139 "Assume intelligent terminal", 140 "Assume dumb terminal", 141 NULL 142 }, 143 #if MSDOS_COMPILER 144 { 'D', &D__optname, 145 STRING|REPAINT|NO_QUERY, 0, NULL, opt_D, 146 "color desc: ", NULL, NULL 147 }, 148 #endif 149 { 'e', &e_optname, 150 TRIPLE, OPT_OFF, &quit_at_eof, NULL, 151 "Don't quit at end-of-file", 152 "Quit at end-of-file", 153 "Quit immediately at end-of-file" 154 }, 155 { 'f', &f_optname, 156 BOOL, OPT_OFF, &force_open, NULL, 157 "Open only regular files", 158 "Open even non-regular files", 159 NULL 160 }, 161 { 'F', &F__optname, 162 BOOL, OPT_OFF, &quit_if_one_screen, NULL, 163 "Don't quit if end-of-file on first screen", 164 "Quit if end-of-file on first screen", 165 NULL 166 }, 167 #if HILITE_SEARCH 168 { 'g', &g_optname, 169 TRIPLE|HL_REPAINT, OPT_ONPLUS, &hilite_search, NULL, 170 "Don't highlight search matches", 171 "Highlight matches for previous search only", 172 "Highlight all matches for previous search pattern", 173 }, 174 #endif 175 { 'h', &h_optname, 176 NUMBER, -1, &back_scroll, NULL, 177 "Backwards scroll limit: ", 178 "Backwards scroll limit is %d lines", 179 NULL 180 }, 181 { 'i', &i_optname, 182 TRIPLE|HL_REPAINT, OPT_OFF, &caseless, opt_i, 183 "Case is significant in searches", 184 "Ignore case in searches", 185 "Ignore case in searches and in patterns" 186 }, 187 { 'j', &j_optname, 188 NUMBER, 1, &jump_sline, NULL, 189 "Target line: ", 190 "Position target at screen line %d", 191 NULL 192 }, 193 { 'J', &J__optname, 194 BOOL|REPAINT, OPT_OFF, &status_col, NULL, 195 "Don't display a status column", 196 "Display a status column", 197 NULL 198 }, 199 #if USERFILE 200 { 'k', &k_optname, 201 STRING|NO_TOGGLE|NO_QUERY, 0, NULL, opt_k, 202 NULL, NULL, NULL 203 }, 204 #endif 205 { 'l', NULL, 206 STRING|NO_TOGGLE|NO_QUERY, 0, NULL, opt_l, 207 NULL, NULL, NULL 208 }, 209 { 'm', &m_optname, 210 TRIPLE, OPT_OFF, &pr_type, NULL, 211 "Short prompt", 212 "Medium prompt", 213 "Long prompt" 214 }, 215 { 'n', &n_optname, 216 TRIPLE|REPAINT, OPT_ON, &linenums, NULL, 217 "Don't use line numbers", 218 "Use line numbers", 219 "Constantly display line numbers" 220 }, 221 #if LOGFILE 222 { 'o', &o_optname, 223 STRING, 0, NULL, opt_o, 224 "log file: ", NULL, NULL 225 }, 226 { 'O', &O__optname, 227 STRING, 0, NULL, opt__O, 228 "Log file: ", NULL, NULL 229 }, 230 #endif 231 { 'p', &p_optname, 232 STRING|NO_TOGGLE|NO_QUERY, 0, NULL, opt_p, 233 NULL, NULL, NULL 234 }, 235 { 'P', &P__optname, 236 STRING, 0, NULL, opt__P, 237 "prompt: ", NULL, NULL 238 }, 239 { 'q', &q_optname, 240 TRIPLE, OPT_OFF, &quiet, NULL, 241 "Ring the bell for errors AND at eof/bof", 242 "Ring the bell for errors but not at eof/bof", 243 "Never ring the bell" 244 }, 245 { 'r', &r_optname, 246 TRIPLE|REPAINT, OPT_OFF, &ctldisp, NULL, 247 "Display control characters as ^X", 248 "Display control characters directly", 249 "Display control characters directly, processing ANSI sequences" 250 }, 251 { 's', &s_optname, 252 BOOL|REPAINT, OPT_OFF, &squeeze, NULL, 253 "Display all blank lines", 254 "Squeeze multiple blank lines", 255 NULL 256 }, 257 { 'S', &S__optname, 258 BOOL|REPAINT, OPT_OFF, &chopline, NULL, 259 "Fold long lines", 260 "Chop long lines", 261 NULL 262 }, 263 #if TAGS 264 { 't', &t_optname, 265 STRING|NO_QUERY, 0, NULL, opt_t, 266 "tag: ", NULL, NULL 267 }, 268 { 'T', &T__optname, 269 STRING, 0, NULL, opt__T, 270 "tags file: ", NULL, NULL 271 }, 272 #endif 273 { 'u', &u_optname, 274 TRIPLE|REPAINT, OPT_OFF, &bs_mode, NULL, 275 "Display underlined text in underline mode", 276 "Backspaces cause overstrike", 277 "Print backspace as ^H" 278 }, 279 { 'V', &V__optname, 280 NOVAR, 0, NULL, opt__V, 281 NULL, NULL, NULL 282 }, 283 { 'w', &w_optname, 284 TRIPLE|REPAINT, OPT_OFF, &show_attn, NULL, 285 "Don't highlight first unread line", 286 "Highlight first unread line after forward-screen", 287 "Highlight first unread line after any forward movement", 288 }, 289 { 'x', &x_optname, 290 NUMBER|REPAINT, 8, &tabstop, NULL, 291 "Tab stops: ", 292 "Tab stops every %d spaces", 293 NULL 294 }, 295 { 'X', &X__optname, 296 BOOL|NO_TOGGLE, OPT_OFF, &no_init, NULL, 297 "Send init/deinit strings to terminal", 298 "Don't use init/deinit strings", 299 NULL 300 }, 301 { 'y', &y_optname, 302 NUMBER, -1, &forw_scroll, NULL, 303 "Forward scroll limit: ", 304 "Forward scroll limit is %d lines", 305 NULL 306 }, 307 { 'z', &z_optname, 308 NUMBER, -1, &swindow, NULL, 309 "Scroll window size: ", 310 "Scroll window size is %d lines", 311 NULL 312 }, 313 { '"', "e_optname, 314 STRING, 0, NULL, opt_quote, 315 "quotes: ", NULL, NULL 316 }, 317 { '~', &tilde_optname, 318 BOOL|REPAINT, OPT_ON, &twiddle, NULL, 319 "Don't show tildes after end of file", 320 "Show tildes after end of file", 321 NULL 322 }, 323 { '?', &query_optname, 324 NOVAR, 0, NULL, opt_query, 325 NULL, NULL, NULL 326 }, 327 { '#', £_optname, 328 NUMBER, 0, &shift_count, NULL, 329 "Horizontal shift: ", 330 "Horizontal shift %d positions", 331 NULL 332 }, 333 { '\0', NULL, NOVAR, 0, NULL, NULL, NULL, NULL, NULL } 334 }; 335 336 337 /* 338 * Initialize each option to its default value. 339 */ 340 public void 341 init_option() 342 { 343 register struct option *o; 344 345 for (o = option; o->oletter != '\0'; o++) 346 { 347 /* 348 * Set each variable to its default. 349 */ 350 if (o->ovar != NULL) 351 *(o->ovar) = o->odefault; 352 } 353 } 354 355 /* 356 * Find an option in the option table, given its option letter. 357 */ 358 public struct option * 359 findopt(c) 360 int c; 361 { 362 register struct option *o; 363 364 for (o = option; o->oletter != '\0'; o++) 365 { 366 if (o->oletter == c) 367 return (o); 368 if ((o->otype & TRIPLE) && toupper(o->oletter) == c) 369 return (o); 370 } 371 return (NULL); 372 } 373 374 /* 375 * Find an option in the option table, given its option name. 376 * p_optname is the (possibly partial) name to look for, and 377 * is updated to point after the matched name. 378 * p_oname if non-NULL is set to point to the full option name. 379 */ 380 public struct option * 381 findopt_name(p_optname, p_oname, p_err) 382 char **p_optname; 383 char **p_oname; 384 int *p_err; 385 { 386 char *optname = *p_optname; 387 register struct option *o; 388 register struct optname *oname; 389 register int len; 390 int uppercase; 391 struct option *maxo = NULL; 392 struct optname *maxoname = NULL; 393 int maxlen = 0; 394 int ambig = 0; 395 int exact = 0; 396 397 /* 398 * Check all options. 399 */ 400 for (o = option; o->oletter != '\0'; o++) 401 { 402 /* 403 * Check all names for this option. 404 */ 405 for (oname = o->onames; oname != NULL; oname = oname->onext) 406 { 407 /* 408 * Try normal match first (uppercase == 0), 409 * then, then if it's a TRIPLE option, 410 * try uppercase match (uppercase == 1). 411 */ 412 for (uppercase = 0; uppercase <= 1; uppercase++) 413 { 414 len = sprefix(optname, oname->oname, uppercase); 415 if (!exact && len == maxlen) 416 /* 417 * Already had a partial match, 418 * and now there's another one that 419 * matches the same length. 420 */ 421 ambig = 1; 422 else if (len > maxlen) 423 { 424 /* 425 * Found a better match than 426 * the one we had. 427 */ 428 maxo = o; 429 maxoname = oname; 430 maxlen = len; 431 ambig = 0; 432 exact = (len == strlen(oname->oname)); 433 } 434 if (!(o->otype & TRIPLE)) 435 break; 436 } 437 } 438 } 439 if (ambig) 440 { 441 /* 442 * Name matched more than one option. 443 */ 444 if (p_err != NULL) 445 *p_err = OPT_AMBIG; 446 return (NULL); 447 } 448 *p_optname = optname + maxlen; 449 if (p_oname != NULL) 450 *p_oname = maxoname->oname; 451 return (maxo); 452 } 453