1 /* infodoc.c -- Functions which build documentation nodes. 2 $Id: infodoc.c,v 1.3 2000/02/09 02:18:40 espie Exp $ 3 4 Copyright (C) 1993, 97, 98, 99 Free Software Foundation, Inc. 5 6 This program is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 2, or (at your option) 9 any later version. 10 11 This program is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 GNU General Public License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with this program; if not, write to the Free Software 18 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 19 20 Written by Brian Fox (bfox@ai.mit.edu). */ 21 22 #include "info.h" 23 24 /* HELP_NODE_GETS_REGENERATED is always defined now that keys may get 25 rebound, or other changes in the help text may occur. */ 26 #define HELP_NODE_GETS_REGENERATED 1 27 28 /* **************************************************************** */ 29 /* */ 30 /* Info Help Windows */ 31 /* */ 32 /* **************************************************************** */ 33 34 /* The name of the node used in the help window. */ 35 static char *info_help_nodename = "*Info Help*"; 36 37 /* A node containing printed key bindings and their documentation. */ 38 static NODE *internal_info_help_node = (NODE *)NULL; 39 40 /* A pointer to the contents of the help node. */ 41 static char *internal_info_help_node_contents = (char *)NULL; 42 43 /* The static text which appears in the internal info help node. */ 44 static char *info_internal_help_text[] = { 45 N_("Basic Commands in Info Windows\n"), 46 N_("******************************\n"), 47 "\n", 48 N_(" %-10s Quit this help.\n"), 49 N_(" %-10s Quit Info altogether.\n"), 50 N_(" %-10s Invoke the Info tutorial.\n"), 51 "\n", 52 N_("Moving within a node:\n"), 53 N_("---------------------\n"), 54 N_(" %-10s Scroll forward a page.\n"), 55 N_(" %-10s Scroll backward a page.\n"), 56 N_(" %-10s Go to the beginning of this node.\n"), 57 N_(" %-10s Go to the end of this node.\n"), 58 N_(" %-10s Scroll forward 1 line.\n"), 59 N_(" %-10s Scroll backward 1 line.\n"), 60 "\n", 61 N_("Selecting other nodes:\n"), 62 N_("----------------------\n"), 63 N_(" %-10s Move to the `next' node of this node.\n"), 64 N_(" %-10s Move to the `previous' node of this node.\n"), 65 N_(" %-10s Move `up' from this node.\n"), 66 N_(" %-10s Pick menu item specified by name.\n"), 67 N_(" Picking a menu item causes another node to be selected.\n"), 68 N_(" %-10s Follow a cross reference. Reads name of reference.\n"), 69 N_(" %-10s Move to the last node seen in this window.\n"), 70 N_(" %-10s Skip to next hypertext link within this node.\n"), 71 N_(" %-10s Follow the hypertext link under cursor.\n"), 72 N_(" %-10s Move to the `directory' node. Equivalent to `g (DIR)'.\n"), 73 N_(" %-10s Move to the Top node. Equivalent to `g Top'.\n"), 74 "\n", 75 N_("Other commands:\n"), 76 N_("---------------\n"), 77 N_(" %-10s Pick first ... ninth item in node's menu.\n"), 78 N_(" %-10s Pick last item in node's menu.\n"), 79 N_(" %-10s Search for a specified string in the index entries of this Info\n"), 80 N_(" file, and select the node referenced by the first entry found.\n"), 81 N_(" %-10s Move to node specified by name.\n"), 82 N_(" You may include a filename as well, as in (FILENAME)NODENAME.\n"), 83 N_(" %-10s Search forward through this Info file for a specified string,\n"), 84 N_(" and select the node in which the next occurrence is found.\n"), 85 N_(" %-10s Search backward in this Info file for a specified string,\n"), 86 N_(" and select the node in which the next occurrence is found.\n"), 87 NULL 88 }; 89 90 static char *info_help_keys_text[][2] = { 91 { "", "" }, 92 { "", "" }, 93 { "", "" }, 94 { "CTRL-x 0", "CTRL-x 0" }, 95 { "q", "q" }, 96 { "h", "ESC h" }, 97 { "", "" }, 98 { "", "" }, 99 { "", "" }, 100 { "SPC", "SPC" }, 101 { "DEL", "b" }, 102 { "b", "ESC b" }, 103 { "e", "ESC e" }, 104 { "ESC 1 SPC", "RET" }, 105 { "ESC 1 DEL", "y" }, 106 { "", "" }, 107 { "", "" }, 108 { "", "" }, 109 { "n", "CTRL-x n" }, 110 { "p", "CTRL-x p" }, 111 { "u", "CTRL-x u" }, 112 { "m", "ESC m" }, 113 { "", "" }, 114 { "f", "ESC f" }, 115 { "l", "l" }, 116 { "TAB", "TAB" }, 117 { "RET", "CTRL-x RET" }, 118 { "d", "ESC d" }, 119 { "t", "ESC t" }, 120 { "", "" }, 121 { "", "" }, 122 { "", "" }, 123 { "1-9", "ESC 1-9" }, 124 { "0", "ESC 0" }, 125 { "i", "CTRL-x i" }, 126 { "", "" }, 127 { "g", "CTRL-x g" }, 128 { "", "" }, 129 { "s", "/" }, 130 { "", "" }, 131 { "ESC - s", "?" }, 132 { "", "" }, 133 NULL 134 }; 135 136 static char *where_is (), *where_is_internal (); 137 138 void 139 dump_map_to_message_buffer (prefix, map) 140 char *prefix; 141 Keymap map; 142 { 143 register int i; 144 145 for (i = 0; i < 256; i++) 146 { 147 if (map[i].type == ISKMAP) 148 { 149 char *new_prefix, *keyname; 150 151 keyname = pretty_keyname (i); 152 new_prefix = (char *) 153 xmalloc (3 + strlen (prefix) + strlen (keyname)); 154 sprintf (new_prefix, "%s%s%s ", prefix, *prefix ? " " : "", keyname); 155 156 dump_map_to_message_buffer (new_prefix, (Keymap)map[i].function); 157 free (new_prefix); 158 } 159 else if (map[i].function) 160 { 161 register int last; 162 char *doc, *name; 163 164 doc = function_documentation (map[i].function); 165 name = function_name (map[i].function); 166 167 if (!*doc) 168 continue; 169 170 /* Find out if there is a series of identical functions, as in 171 ea_insert (). */ 172 for (last = i + 1; last < 256; last++) 173 if ((map[last].type != ISFUNC) || 174 (map[last].function != map[i].function)) 175 break; 176 177 if (last - 1 != i) 178 { 179 printf_to_message_buffer 180 ("%s%s .. ", prefix, pretty_keyname (i)); 181 printf_to_message_buffer 182 ("%s%s\t", prefix, pretty_keyname (last - 1)); 183 i = last - 1; 184 } 185 else 186 printf_to_message_buffer ("%s%s\t", prefix, pretty_keyname (i)); 187 188 #if defined (NAMED_FUNCTIONS) 189 /* Print the name of the function, and some padding before the 190 documentation string is printed. */ 191 { 192 int length_so_far; 193 int desired_doc_start = 40; /* Must be multiple of 8. */ 194 195 printf_to_message_buffer ("(%s)", name); 196 length_so_far = message_buffer_length_this_line (); 197 198 if ((desired_doc_start + strlen (doc)) >= the_screen->width) 199 printf_to_message_buffer ("\n "); 200 else 201 { 202 while (length_so_far < desired_doc_start) 203 { 204 printf_to_message_buffer ("\t"); 205 length_so_far += character_width ('\t', length_so_far); 206 } 207 } 208 } 209 #endif /* NAMED_FUNCTIONS */ 210 printf_to_message_buffer ("%s\n", doc); 211 } 212 } 213 } 214 215 /* How to create internal_info_help_node. HELP_IS_ONLY_WINDOW_P says 216 whether we're going to end up in a second (or more) window of our 217 own, or whether there's only one window and we're going to usurp it. 218 This determines how to quit the help window. Maybe we should just 219 make q do the right thing in both cases. */ 220 221 static void 222 create_internal_info_help_node (help_is_only_window_p) 223 int help_is_only_window_p; 224 { 225 register int i; 226 NODE *node; 227 char *contents = NULL; 228 229 #ifndef HELP_NODE_GETS_REGENERATED 230 if (internal_info_help_node_contents) 231 contents = internal_info_help_node_contents; 232 #endif /* !HELP_NODE_GETS_REGENERATED */ 233 234 if (!contents) 235 { 236 int printed_one_mx = 0; 237 238 initialize_message_buffer (); 239 240 for (i = 0; info_internal_help_text[i]; i++) 241 { 242 /* Don't translate blank lines, gettext outputs the po file 243 header in that case. We want a blank line. */ 244 char *msg = *(info_internal_help_text[i]) 245 ? _(info_internal_help_text[i]) 246 : info_internal_help_text[i]; 247 char *key = info_help_keys_text[i][vi_keys_p]; 248 249 /* If we have only one window (because the window size was too 250 small to split it), CTRL-x 0 doesn't work to `quit' help. */ 251 if (STREQ (key, "CTRL-x 0") && help_is_only_window_p) 252 key = "l"; 253 254 printf_to_message_buffer (msg, key); 255 } 256 257 printf_to_message_buffer ("---------------------\n\n"); 258 printf_to_message_buffer (_("The current search path is:\n")); 259 printf_to_message_buffer (" %s\n", infopath); 260 printf_to_message_buffer ("---------------------\n\n"); 261 printf_to_message_buffer (_("Commands available in Info windows:\n\n")); 262 dump_map_to_message_buffer ("", info_keymap); 263 printf_to_message_buffer ("---------------------\n\n"); 264 printf_to_message_buffer (_("Commands available in the echo area:\n\n")); 265 dump_map_to_message_buffer ("", echo_area_keymap); 266 267 #if defined (NAMED_FUNCTIONS) 268 /* Get a list of the M-x commands which have no keystroke equivs. */ 269 for (i = 0; function_doc_array[i].func; i++) 270 { 271 VFunction *func = function_doc_array[i].func; 272 273 if ((!where_is_internal (info_keymap, func)) && 274 (!where_is_internal (echo_area_keymap, func))) 275 { 276 if (!printed_one_mx) 277 { 278 printf_to_message_buffer ("---------------------\n\n"); 279 printf_to_message_buffer 280 (_("The following commands can only be invoked via M-x:\n\n")); 281 printed_one_mx = 1; 282 } 283 284 printf_to_message_buffer 285 ("M-x %s\n %s\n", 286 function_doc_array[i].func_name, 287 replace_in_documentation (strlen (function_doc_array[i].doc) 288 == 0 289 ? function_doc_array[i].doc 290 : _(function_doc_array[i].doc))); 291 292 } 293 } 294 295 if (printed_one_mx) 296 printf_to_message_buffer ("\n"); 297 #endif /* NAMED_FUNCTIONS */ 298 299 printf_to_message_buffer 300 ("%s", replace_in_documentation 301 (_("--- Use `\\[history-node]' or `\\[kill-node]' to exit ---\n"))); 302 node = message_buffer_to_node (); 303 internal_info_help_node_contents = node->contents; 304 } 305 else 306 { 307 /* We already had the right contents, so simply use them. */ 308 node = build_message_node ("", 0, 0); 309 free (node->contents); 310 node->contents = contents; 311 node->nodelen = 1 + strlen (contents); 312 } 313 314 internal_info_help_node = node; 315 316 /* Do not GC this node's contents. It never changes, and we never need 317 to delete it once it is made. If you change some things (such as 318 placing information about dynamic variables in the help text) then 319 you will need to allow the contents to be gc'd, and you will have to 320 arrange to always regenerate the help node. */ 321 #if defined (HELP_NODE_GETS_REGENERATED) 322 add_gcable_pointer (internal_info_help_node->contents); 323 #endif 324 325 name_internal_node (internal_info_help_node, info_help_nodename); 326 327 /* Even though this is an internal node, we don't want the window 328 system to treat it specially. So we turn off the internalness 329 of it here. */ 330 internal_info_help_node->flags &= ~N_IsInternal; 331 } 332 333 /* Return a window which is the window showing help in this Info. */ 334 335 /* If the eligible window's height is >= this, split it to make the help 336 window. Otherwise display the help window in the current window. */ 337 #define HELP_SPLIT_SIZE 24 338 339 static WINDOW * 340 info_find_or_create_help_window () 341 { 342 int help_is_only_window_p; 343 WINDOW *eligible = NULL; 344 WINDOW *help_window = get_window_of_node (internal_info_help_node); 345 346 /* If we couldn't find the help window, then make it. */ 347 if (!help_window) 348 { 349 WINDOW *window; 350 int max = 0; 351 352 for (window = windows; window; window = window->next) 353 { 354 if (window->height > max) 355 { 356 max = window->height; 357 eligible = window; 358 } 359 } 360 361 if (!eligible) 362 return NULL; 363 } 364 #ifndef HELP_NODE_GETS_REGENERATED 365 else 366 /* help window is static, just return it. */ 367 return help_window; 368 #endif /* not HELP_NODE_GETS_REGENERATED */ 369 370 /* Make sure that we have a node containing the help text. The 371 argument is false if help will be the only window (so l must be used 372 to quit help), true if help will be one of several visible windows 373 (so CTRL-x 0 must be used to quit help). */ 374 help_is_only_window_p 375 = (help_window && !windows->next 376 || !help_window && eligible->height < HELP_SPLIT_SIZE); 377 create_internal_info_help_node (help_is_only_window_p); 378 379 /* Either use the existing window to display the help node, or create 380 a new window if there was no existing help window. */ 381 if (!help_window) 382 { /* Split the largest window into 2 windows, and show the help text 383 in that window. */ 384 if (eligible->height >= HELP_SPLIT_SIZE) 385 { 386 active_window = eligible; 387 help_window = window_make_window (internal_info_help_node); 388 } 389 else 390 { 391 set_remembered_pagetop_and_point (active_window); 392 window_set_node_of_window (active_window, internal_info_help_node); 393 help_window = active_window; 394 } 395 } 396 else 397 { /* Case where help node always gets regenerated, and we have an 398 existing window in which to place the node. */ 399 if (active_window != help_window) 400 { 401 set_remembered_pagetop_and_point (active_window); 402 active_window = help_window; 403 } 404 window_set_node_of_window (active_window, internal_info_help_node); 405 } 406 remember_window_and_node (help_window, help_window->node); 407 return help_window; 408 } 409 410 /* Create or move to the help window. */ 411 DECLARE_INFO_COMMAND (info_get_help_window, _("Display help message")) 412 { 413 WINDOW *help_window; 414 415 help_window = info_find_or_create_help_window (); 416 if (help_window) 417 { 418 active_window = help_window; 419 active_window->flags |= W_UpdateWindow; 420 } 421 else 422 { 423 info_error (msg_cant_make_help); 424 } 425 } 426 427 /* Show the Info help node. This means that the "info" file is installed 428 where it can easily be found on your system. */ 429 DECLARE_INFO_COMMAND (info_get_info_help_node, _("Visit Info node `(info)Help'")) 430 { 431 NODE *node; 432 char *nodename; 433 434 /* If there is a window on the screen showing the node "(info)Help" or 435 the node "(info)Help-Small-Screen", simply select that window. */ 436 { 437 WINDOW *win; 438 439 for (win = windows; win; win = win->next) 440 { 441 if (win->node && win->node->filename && 442 (strcasecmp 443 (filename_non_directory (win->node->filename), "info") == 0) && 444 ((strcmp (win->node->nodename, "Help") == 0) || 445 (strcmp (win->node->nodename, "Help-Small-Screen") == 0))) 446 { 447 active_window = win; 448 return; 449 } 450 } 451 } 452 453 /* If the current window is small, show the small screen help. */ 454 if (active_window->height < 24) 455 nodename = "Help-Small-Screen"; 456 else 457 nodename = "Help"; 458 459 /* Try to get the info file for Info. */ 460 node = info_get_node ("Info", nodename); 461 462 if (!node) 463 { 464 if (info_recent_file_error) 465 info_error (info_recent_file_error); 466 else 467 info_error (msg_cant_file_node, "Info", nodename); 468 } 469 else 470 { 471 /* If the current window is very large (greater than 45 lines), 472 then split it and show the help node in another window. 473 Otherwise, use the current window. */ 474 475 if (active_window->height > 45) 476 active_window = window_make_window (node); 477 else 478 { 479 set_remembered_pagetop_and_point (active_window); 480 window_set_node_of_window (active_window, node); 481 } 482 483 remember_window_and_node (active_window, node); 484 } 485 } 486 487 /* **************************************************************** */ 488 /* */ 489 /* Groveling Info Keymaps and Docs */ 490 /* */ 491 /* **************************************************************** */ 492 493 /* Return the documentation associated with the Info command FUNCTION. */ 494 char * 495 function_documentation (function) 496 VFunction *function; 497 { 498 register int i; 499 500 for (i = 0; function_doc_array[i].func; i++) 501 if (function == function_doc_array[i].func) 502 break; 503 504 return replace_in_documentation ((strlen (function_doc_array[i].doc) == 0) 505 ? function_doc_array[i].doc 506 : _(function_doc_array[i].doc)); 507 } 508 509 #if defined (NAMED_FUNCTIONS) 510 /* Return the user-visible name of the function associated with the 511 Info command FUNCTION. */ 512 char * 513 function_name (function) 514 515 VFunction *function; 516 { 517 register int i; 518 519 for (i = 0; function_doc_array[i].func; i++) 520 if (function == function_doc_array[i].func) 521 break; 522 523 return (function_doc_array[i].func_name); 524 } 525 526 /* Return a pointer to the function named NAME. */ 527 VFunction * 528 named_function (name) 529 char *name; 530 { 531 register int i; 532 533 for (i = 0; function_doc_array[i].func; i++) 534 if (strcmp (function_doc_array[i].func_name, name) == 0) 535 break; 536 537 return (function_doc_array[i].func); 538 } 539 #endif /* NAMED_FUNCTIONS */ 540 541 /* Return the documentation associated with KEY in MAP. */ 542 char * 543 key_documentation (key, map) 544 char key; 545 Keymap map; 546 { 547 VFunction *function = map[key].function; 548 549 if (function) 550 return (function_documentation (function)); 551 else 552 return ((char *)NULL); 553 } 554 555 DECLARE_INFO_COMMAND (describe_key, _("Print documentation for KEY")) 556 { 557 char keyname[50]; 558 int keyname_index = 0; 559 unsigned char keystroke; 560 char *rep; 561 Keymap map; 562 563 keyname[0] = 0; 564 map = window->keymap; 565 566 for (;;) 567 { 568 message_in_echo_area (_("Describe key: %s"), keyname); 569 keystroke = info_get_input_char (); 570 unmessage_in_echo_area (); 571 572 if (Meta_p (keystroke)) 573 { 574 if (map[ESC].type != ISKMAP) 575 { 576 window_message_in_echo_area 577 (_("ESC %s is undefined."), pretty_keyname (UnMeta (keystroke))); 578 return; 579 } 580 581 strcpy (keyname + keyname_index, "ESC "); 582 keyname_index = strlen (keyname); 583 keystroke = UnMeta (keystroke); 584 map = (Keymap)map[ESC].function; 585 } 586 587 /* Add the printed representation of KEYSTROKE to our keyname. */ 588 rep = pretty_keyname (keystroke); 589 strcpy (keyname + keyname_index, rep); 590 keyname_index = strlen (keyname); 591 592 if (map[keystroke].function == (VFunction *)NULL) 593 { 594 message_in_echo_area (_("%s is undefined."), keyname); 595 return; 596 } 597 else if (map[keystroke].type == ISKMAP) 598 { 599 map = (Keymap)map[keystroke].function; 600 strcat (keyname, " "); 601 keyname_index = strlen (keyname); 602 continue; 603 } 604 else 605 { 606 char *message, *fundoc, *funname = ""; 607 608 #if defined (NAMED_FUNCTIONS) 609 funname = function_name (map[keystroke].function); 610 #endif /* NAMED_FUNCTIONS */ 611 612 fundoc = function_documentation (map[keystroke].function); 613 614 message = (char *)xmalloc 615 (10 + strlen (keyname) + strlen (fundoc) + strlen (funname)); 616 617 #if defined (NAMED_FUNCTIONS) 618 sprintf (message, "%s (%s): %s.", keyname, funname, fundoc); 619 #else 620 sprintf (message, _("%s is defined to %s."), keyname, fundoc); 621 #endif /* !NAMED_FUNCTIONS */ 622 623 window_message_in_echo_area ("%s", message); 624 free (message); 625 break; 626 } 627 } 628 } 629 630 /* How to get the pretty printable name of a character. */ 631 static char rep_buffer[30]; 632 633 char * 634 pretty_keyname (key) 635 unsigned char key; 636 { 637 char *rep; 638 639 if (Meta_p (key)) 640 { 641 char temp[20]; 642 643 rep = pretty_keyname (UnMeta (key)); 644 645 sprintf (temp, "ESC %s", rep); 646 strcpy (rep_buffer, temp); 647 rep = rep_buffer; 648 } 649 else if (Control_p (key)) 650 { 651 switch (key) 652 { 653 case '\n': rep = "LFD"; break; 654 case '\t': rep = "TAB"; break; 655 case '\r': rep = "RET"; break; 656 case ESC: rep = "ESC"; break; 657 658 default: 659 sprintf (rep_buffer, "C-%c", UnControl (key)); 660 rep = rep_buffer; 661 } 662 } 663 else 664 { 665 switch (key) 666 { 667 case ' ': rep = "SPC"; break; 668 case DEL: rep = "DEL"; break; 669 default: 670 rep_buffer[0] = key; 671 rep_buffer[1] = '\0'; 672 rep = rep_buffer; 673 } 674 } 675 return (rep); 676 } 677 678 /* Replace the names of functions with the key that invokes them. */ 679 char * 680 replace_in_documentation (string) 681 char *string; 682 { 683 register int i, start, next; 684 static char *result = (char *)NULL; 685 686 maybe_free (result); 687 result = (char *)xmalloc (1 + strlen (string)); 688 689 i = next = start = 0; 690 691 /* Skip to the beginning of a replaceable function. */ 692 for (i = start; string[i]; i++) 693 { 694 /* Is this the start of a replaceable function name? */ 695 if (string[i] == '\\' && string[i + 1] == '[') 696 { 697 char *fun_name, *rep; 698 VFunction *function; 699 700 /* Copy in the old text. */ 701 strncpy (result + next, string + start, i - start); 702 next += (i - start); 703 start = i + 2; 704 705 /* Move to the end of the function name. */ 706 for (i = start; string[i] && (string[i] != ']'); i++); 707 708 fun_name = (char *)xmalloc (1 + i - start); 709 strncpy (fun_name, string + start, i - start); 710 fun_name[i - start] = '\0'; 711 712 /* Find a key which invokes this function in the info_keymap. */ 713 function = named_function (fun_name); 714 715 /* If the internal documentation string fails, there is a 716 serious problem with the associated command's documentation. 717 We croak so that it can be fixed immediately. */ 718 if (!function) 719 abort (); 720 721 rep = where_is (info_keymap, function); 722 strcpy (result + next, rep); 723 next = strlen (result); 724 725 start = i; 726 if (string[i]) 727 start++; 728 } 729 } 730 strcpy (result + next, string + start); 731 return (result); 732 } 733 734 /* Return a string of characters which could be typed from the keymap 735 MAP to invoke FUNCTION. */ 736 static char *where_is_rep = (char *)NULL; 737 static int where_is_rep_index = 0; 738 static int where_is_rep_size = 0; 739 740 static char * 741 where_is (map, function) 742 Keymap map; 743 VFunction *function; 744 { 745 char *rep; 746 747 if (!where_is_rep_size) 748 where_is_rep = (char *)xmalloc (where_is_rep_size = 100); 749 where_is_rep_index = 0; 750 751 rep = where_is_internal (map, function); 752 753 /* If it couldn't be found, return "M-x Foo". */ 754 if (!rep) 755 { 756 char *name; 757 758 name = function_name (function); 759 760 if (name) 761 sprintf (where_is_rep, "M-x %s", name); 762 763 rep = where_is_rep; 764 } 765 return (rep); 766 } 767 768 /* Return the printed rep of FUNCTION as found in MAP, or NULL. */ 769 static char * 770 where_is_internal (map, function) 771 Keymap map; 772 VFunction *function; 773 { 774 register int i; 775 776 /* If the function is directly invokable in MAP, return the representation 777 of that keystroke. */ 778 for (i = 0; i < 256; i++) 779 if ((map[i].type == ISFUNC) && map[i].function == function) 780 { 781 sprintf (where_is_rep + where_is_rep_index, "%s", pretty_keyname (i)); 782 return (where_is_rep); 783 } 784 785 /* Okay, search subsequent maps for this function. */ 786 for (i = 0; i < 256; i++) 787 { 788 if (map[i].type == ISKMAP) 789 { 790 int saved_index = where_is_rep_index; 791 char *rep; 792 793 sprintf (where_is_rep + where_is_rep_index, "%s ", 794 pretty_keyname (i)); 795 796 where_is_rep_index = strlen (where_is_rep); 797 rep = where_is_internal ((Keymap)map[i].function, function); 798 799 if (rep) 800 return (where_is_rep); 801 802 where_is_rep_index = saved_index; 803 } 804 } 805 806 return NULL; 807 } 808 809 extern char *read_function_name (); 810 811 DECLARE_INFO_COMMAND (info_where_is, 812 _("Show what to type to execute a given command")) 813 { 814 char *command_name; 815 816 command_name = read_function_name (_("Where is command: "), window); 817 818 if (!command_name) 819 { 820 info_abort_key (active_window, count, key); 821 return; 822 } 823 824 if (*command_name) 825 { 826 VFunction *function; 827 828 function = named_function (command_name); 829 830 if (function) 831 { 832 char *location; 833 834 location = where_is (active_window->keymap, function); 835 836 if (!location) 837 { 838 info_error (_("`%s' is not on any keys"), command_name); 839 } 840 else 841 { 842 if (strncmp (location, "M-x ", 4) == 0) 843 window_message_in_echo_area 844 (_("%s can only be invoked via %s."), command_name, location); 845 else 846 window_message_in_echo_area 847 (_("%s can be invoked via %s."), command_name, location); 848 } 849 } 850 else 851 info_error (_("There is no function named `%s'"), command_name); 852 } 853 854 free (command_name); 855 } 856