1 /* 2 * Copyright (C) 1984-2024 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 * Prompting and other messages. 13 * There are three flavors of prompts, SHORT, MEDIUM and LONG, 14 * selected by the -m/-M options. 15 * There is also the "equals message", printed by the = command. 16 * A prompt is a message composed of various pieces, such as the 17 * name of the file being viewed, the percentage into the file, etc. 18 */ 19 20 #include "less.h" 21 #include "position.h" 22 23 extern int pr_type; 24 extern lbool new_file; 25 extern int linenums; 26 extern int hshift; 27 extern int sc_height; 28 extern int jump_sline; 29 extern int less_is_more; 30 extern int header_lines; 31 extern int utf_mode; 32 extern IFILE curr_ifile; 33 #if OSC8_LINK 34 extern char *osc8_path; 35 #endif 36 #if EDITOR 37 extern constant char *editor; 38 extern constant char *editproto; 39 #endif 40 41 /* 42 * Prototypes for the three flavors of prompts. 43 * These strings are expanded by pr_expand(). 44 */ 45 static constant char s_proto[] = 46 "?n?f%f .?m(%T %i of %m) ..?e(END) ?x- Next\\: %x..%t"; 47 static constant char m_proto[] = 48 "?n?f%f .?m(%T %i of %m) ..?e(END) ?x- Next\\: %x.:?pB%pB\\%:byte %bB?s/%s...%t"; 49 static constant char M_proto[] = 50 "?f%f .?n?m(%T %i of %m) ..?ltlines %lt-%lb?L/%L. :byte %bB?s/%s. .?e(END) ?x- Next\\: %x.:?pB%pB\\%..%t"; 51 static constant char e_proto[] = 52 "?f%f .?m(%T %i of %m) .?ltlines %lt-%lb?L/%L. .byte %bB?s/%s. ?e(END) :?pB%pB\\%..%t"; 53 static constant char h_proto[] = 54 "HELP -- ?eEND -- Press g to see it again:Press RETURN for more., or q when done"; 55 static constant char w_proto[] = 56 "Waiting for data"; 57 static constant char more_proto[] = 58 "--More--(?eEND ?x- Next\\: %x.:?pB%pB\\%:byte %bB?s/%s...%t)"; 59 60 public char *prproto[3]; 61 public char constant *eqproto = e_proto; 62 public char constant *hproto = h_proto; 63 public char constant *wproto = w_proto; 64 65 static char message[PROMPT_SIZE]; 66 static char *mp; 67 68 /* 69 * Initialize the prompt prototype strings. 70 */ 71 public void init_prompt(void) 72 { 73 prproto[0] = save(s_proto); 74 prproto[1] = save(less_is_more ? more_proto : m_proto); 75 prproto[2] = save(M_proto); 76 eqproto = save(e_proto); 77 hproto = save(h_proto); 78 wproto = save(w_proto); 79 } 80 81 /* 82 * Append a string to the end of the message. 83 * nprt means the character *may* be nonprintable 84 * and should be converted to printable form. 85 */ 86 static void ap_estr(constant char *s, lbool nprt) 87 { 88 constant char *es = s + strlen(s); 89 while (*s != '\0') 90 { 91 LWCHAR ch = step_charc(&s, +1, es); 92 constant char *ps; 93 char ubuf[MAX_UTF_CHAR_LEN+1]; 94 size_t plen; 95 96 if (nprt) 97 { 98 ps = utf_mode ? prutfchar(ch) : prchar(ch); 99 } else 100 { 101 char *up = ubuf; 102 put_wchar(&up, ch); 103 *up = '\0'; 104 ps = ubuf; 105 } 106 plen = strlen(ps); 107 if (mp + plen >= message + PROMPT_SIZE) 108 break; 109 strcpy(mp, ps); 110 mp += plen; 111 } 112 *mp = '\0'; 113 } 114 115 static void ap_str(constant char *s) 116 { 117 ap_estr(s, FALSE); 118 } 119 120 121 /* 122 * Append a character to the end of the message. 123 */ 124 static void ap_char(char c) 125 { 126 char buf[2]; 127 128 buf[0] = c; 129 buf[1] = '\0'; 130 ap_str(buf); 131 } 132 133 /* 134 * Append a POSITION (as a decimal integer) to the end of the message. 135 */ 136 static void ap_pos(POSITION pos) 137 { 138 char buf[INT_STRLEN_BOUND(pos) + 2]; 139 140 postoa(pos, buf, 10); 141 ap_str(buf); 142 } 143 144 /* 145 * Append a line number to the end of the message. 146 */ 147 static void ap_linenum(LINENUM linenum) 148 { 149 char buf[INT_STRLEN_BOUND(linenum) + 2]; 150 151 linenumtoa(linenum, buf, 10); 152 ap_str(buf); 153 } 154 155 /* 156 * Append an integer to the end of the message. 157 */ 158 static void ap_int(int num) 159 { 160 char buf[INT_STRLEN_BOUND(num) + 2]; 161 162 inttoa(num, buf, 10); 163 ap_str(buf); 164 } 165 166 /* 167 * Append a question mark to the end of the message. 168 */ 169 static void ap_quest(void) 170 { 171 ap_str("?"); 172 } 173 174 /* 175 * Return the "current" byte offset in the file. 176 */ 177 static POSITION curr_byte(int where) 178 { 179 POSITION pos; 180 181 pos = position(where); 182 while (pos == NULL_POSITION && where >= 0 && where < sc_height-1) 183 pos = position(++where); 184 if (pos == NULL_POSITION) 185 pos = ch_length(); 186 return (pos); 187 } 188 189 /* 190 * Return the value of a prototype conditional. 191 * A prototype string may include conditionals which consist of a 192 * question mark followed by a single letter. 193 * Here we decode that letter and return the appropriate boolean value. 194 */ 195 static lbool cond(char c, int where) 196 { 197 POSITION len; 198 199 switch (c) 200 { 201 case 'a': /* Anything in the message yet? */ 202 return (mp > message); 203 case 'b': /* Current byte offset known? */ 204 return (curr_byte(where) != NULL_POSITION); 205 case 'c': 206 return (hshift != 0); 207 case 'e': /* At end of file? */ 208 return (eof_displayed()); 209 case 'f': /* Filename known? */ 210 case 'g': 211 return (strcmp(get_filename(curr_ifile), "-") != 0); 212 case 'l': /* Line number known? */ 213 case 'd': /* Same as l */ 214 if (!linenums) 215 return FALSE; 216 return (currline(where) != 0); 217 case 'L': /* Final line number known? */ 218 case 'D': /* Final page number known? */ 219 return (linenums && ch_length() != NULL_POSITION); 220 case 'm': /* More than one file? */ 221 #if TAGS 222 return (ntags() ? (ntags() > 1) : (nifile() > 1)); 223 #else 224 return (nifile() > 1); 225 #endif 226 case 'n': /* First prompt in a new file? */ 227 #if TAGS 228 return (ntags() ? TRUE : new_file ? TRUE : FALSE); 229 #else 230 return (new_file ? TRUE : FALSE); 231 #endif 232 case 'p': /* Percent into file (bytes) known? */ 233 return (curr_byte(where) != NULL_POSITION && ch_length() > 0); 234 case 'P': /* Percent into file (lines) known? */ 235 return (currline(where) != 0 && 236 (len = ch_length()) > 0 && 237 find_linenum(len) != 0); 238 case 's': /* Size of file known? */ 239 case 'B': 240 return (ch_length() != NULL_POSITION); 241 case 'x': /* Is there a "next" file? */ 242 #if TAGS 243 if (ntags()) 244 return (FALSE); 245 #endif 246 return (next_ifile(curr_ifile) != NULL_IFILE); 247 } 248 return (FALSE); 249 } 250 251 /* 252 * Decode a "percent" prototype character. 253 * A prototype string may include various "percent" escapes; 254 * that is, a percent sign followed by a single letter. 255 * Here we decode that letter and take the appropriate action, 256 * usually by appending something to the message being built. 257 */ 258 static void protochar(char c, int where) 259 { 260 POSITION pos; 261 POSITION len; 262 int n; 263 LINENUM linenum; 264 LINENUM last_linenum; 265 IFILE h; 266 char *s; 267 268 #undef PAGE_NUM 269 #define PAGE_NUM(linenum) ((((linenum) - 1) / (sc_height - header_lines - 1)) + 1) 270 271 switch (c) 272 { 273 case 'b': /* Current byte offset */ 274 pos = curr_byte(where); 275 if (pos != NULL_POSITION) 276 ap_pos(pos); 277 else 278 ap_quest(); 279 break; 280 case 'c': 281 ap_int(hshift); 282 break; 283 case 'd': /* Current page number */ 284 linenum = currline(where); 285 if (linenum > 0 && sc_height > header_lines + 1) 286 ap_linenum(PAGE_NUM(linenum)); 287 else 288 ap_quest(); 289 break; 290 case 'D': /* Final page number */ 291 /* Find the page number of the last byte in the file (len-1). */ 292 len = ch_length(); 293 if (len == NULL_POSITION) 294 ap_quest(); 295 else if (len == 0) 296 /* An empty file has no pages. */ 297 ap_linenum(0); 298 else 299 { 300 linenum = find_linenum(len - 1); 301 if (linenum <= 0) 302 ap_quest(); 303 else 304 ap_linenum(PAGE_NUM(linenum)); 305 } 306 break; 307 #if EDITOR 308 case 'E': /* Editor name */ 309 ap_str(editor); 310 break; 311 #endif 312 case 'f': /* File name */ 313 ap_estr(get_filename(curr_ifile), TRUE); 314 break; 315 case 'F': /* Last component of file name */ 316 ap_estr(last_component(get_filename(curr_ifile)), TRUE); 317 break; 318 case 'g': /* Shell-escaped file name */ 319 s = shell_quote(get_filename(curr_ifile)); 320 ap_str(s); 321 free(s); 322 break; 323 case 'i': /* Index into list of files */ 324 #if TAGS 325 if (ntags()) 326 ap_int(curr_tag()); 327 else 328 #endif 329 ap_int(get_index(curr_ifile)); 330 break; 331 case 'l': /* Current line number */ 332 linenum = currline(where); 333 if (linenum != 0) 334 ap_linenum(vlinenum(linenum)); 335 else 336 ap_quest(); 337 break; 338 case 'L': /* Final line number */ 339 len = ch_length(); 340 if (len == NULL_POSITION || len == ch_zero() || 341 (linenum = find_linenum(len)) <= 0) 342 ap_quest(); 343 else 344 ap_linenum(vlinenum(linenum-1)); 345 break; 346 case 'm': /* Number of files */ 347 #if TAGS 348 n = ntags(); 349 if (n) 350 ap_int(n); 351 else 352 #endif 353 ap_int(nifile()); 354 break; 355 case 'o': /* path (URI without protocol) of selected OSC8 link */ 356 #if OSC8_LINK 357 if (osc8_path != NULL) 358 ap_str(osc8_path); 359 else 360 #endif 361 ap_quest(); 362 break; 363 case 'p': /* Percent into file (bytes) */ 364 pos = curr_byte(where); 365 len = ch_length(); 366 if (pos != NULL_POSITION && len > 0) 367 ap_int(percentage(pos,len)); 368 else 369 ap_quest(); 370 break; 371 case 'P': /* Percent into file (lines) */ 372 linenum = currline(where); 373 if (linenum == 0 || 374 (len = ch_length()) == NULL_POSITION || len == ch_zero() || 375 (last_linenum = find_linenum(len)) <= 0) 376 ap_quest(); 377 else 378 ap_int(percentage(linenum, last_linenum)); 379 break; 380 case 's': /* Size of file */ 381 case 'B': 382 len = ch_length(); 383 if (len != NULL_POSITION) 384 ap_pos(len); 385 else 386 ap_quest(); 387 break; 388 case 't': /* Truncate trailing spaces in the message */ 389 while (mp > message && mp[-1] == ' ') 390 mp--; 391 *mp = '\0'; 392 break; 393 case 'T': /* Type of list */ 394 #if TAGS 395 if (ntags()) 396 ap_str("tag"); 397 else 398 #endif 399 ap_str("file"); 400 break; 401 case 'x': /* Name of next file */ 402 h = next_ifile(curr_ifile); 403 if (h != NULL_IFILE) 404 ap_str(get_filename(h)); 405 else 406 ap_quest(); 407 break; 408 } 409 } 410 411 /* 412 * Skip a false conditional. 413 * When a false condition is found (either a false IF or the ELSE part 414 * of a true IF), this routine scans the prototype string to decide 415 * where to resume parsing the string. 416 * We must keep track of nested IFs and skip them properly. 417 */ 418 static constant char * skipcond(constant char *p) 419 { 420 int iflevel; 421 422 /* 423 * We came in here after processing a ? or :, 424 * so we start nested one level deep. 425 */ 426 iflevel = 1; 427 428 for (;;) switch (*++p) 429 { 430 case '?': 431 /* 432 * Start of a nested IF. 433 */ 434 iflevel++; 435 break; 436 case ':': 437 /* 438 * Else. 439 * If this matches the IF we came in here with, 440 * then we're done. 441 */ 442 if (iflevel == 1) 443 return (p); 444 break; 445 case '.': 446 /* 447 * Endif. 448 * If this matches the IF we came in here with, 449 * then we're done. 450 */ 451 if (--iflevel == 0) 452 return (p); 453 break; 454 case '\\': 455 /* 456 * Backslash escapes the next character. 457 */ 458 if (p[1] != '\0') 459 ++p; 460 break; 461 case '\0': 462 /* 463 * Whoops. Hit end of string. 464 * This is a malformed conditional, but just treat it 465 * as if all active conditionals ends here. 466 */ 467 return (p-1); 468 } 469 /*NOTREACHED*/ 470 } 471 472 /* 473 * Decode a char that represents a position on the screen. 474 */ 475 static constant char * wherechar(char constant *p, int *wp) 476 { 477 switch (*p) 478 { 479 case 'b': case 'd': case 'l': case 'p': case 'P': 480 switch (*++p) 481 { 482 case 't': *wp = TOP; break; 483 case 'm': *wp = MIDDLE; break; 484 case 'b': *wp = BOTTOM; break; 485 case 'B': *wp = BOTTOM_PLUS_ONE; break; 486 case 'j': *wp = sindex_from_sline(jump_sline); break; 487 default: *wp = TOP; p--; break; 488 } 489 } 490 return (p); 491 } 492 493 /* 494 * Construct a message based on a prototype string. 495 */ 496 public constant char * pr_expand(constant char *proto) 497 { 498 constant char *p; 499 char c; 500 int where; 501 502 mp = message; 503 504 if (*proto == '\0') 505 return (""); 506 507 for (p = proto; *p != '\0'; p++) 508 { 509 switch (*p) 510 { 511 default: /* Just put the character in the message */ 512 ap_char(*p); 513 break; 514 case '\\': /* Backslash escapes the next character */ 515 if (p[1] != '\0') 516 ap_char(*++p); 517 break; 518 case '?': /* Conditional (IF) */ 519 if ((c = *++p) == '\0') 520 --p; 521 else 522 { 523 where = 0; 524 p = wherechar(p, &where); 525 if (!cond(c, where)) 526 p = skipcond(p); 527 } 528 break; 529 case ':': /* ELSE */ 530 p = skipcond(p); 531 break; 532 case '.': /* ENDIF */ 533 break; 534 case '%': /* Percent escape */ 535 if ((c = *++p) == '\0') 536 --p; 537 else 538 { 539 where = 0; 540 p = wherechar(p, &where); 541 protochar(c, where); 542 } 543 break; 544 } 545 } 546 547 if (mp == message) 548 return (""); 549 return (message); 550 } 551 552 /* 553 * Return a message suitable for printing by the "=" command. 554 */ 555 public constant char * eq_message(void) 556 { 557 return (pr_expand(eqproto)); 558 } 559 560 /* 561 * Return a prompt. 562 * This depends on the prompt type (SHORT, MEDIUM, LONG), etc. 563 * If we can't come up with an appropriate prompt, return NULL 564 * and the caller will prompt with a colon. 565 */ 566 public constant char * pr_string(void) 567 { 568 constant char *prompt; 569 int type; 570 571 type = (!less_is_more) ? pr_type : pr_type ? 0 : 1; 572 prompt = pr_expand((ch_getflags() & CH_HELPFILE) ? 573 hproto : prproto[type]); 574 new_file = FALSE; 575 return (prompt); 576 } 577 578 /* 579 * Return a message suitable for printing while waiting in the F command. 580 */ 581 public constant char * wait_message(void) 582 { 583 return (pr_expand(wproto)); 584 } 585