| /* **************************************************************** */ |
| /* */ |
| /* I-Search and Searching */ |
| /* */ |
| /* **************************************************************** */ |
| |
| /* Copyright (C) 1987,1989 Free Software Foundation, Inc. |
| |
| This file contains the Readline Library (the Library), a set of |
| routines for providing Emacs style line input to programs that ask |
| for it. |
| |
| The Library is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2, or (at your option) |
| any later version. |
| |
| The Library is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| General Public License for more details. |
| |
| The GNU General Public License is often shipped with GNU software, and |
| is generally kept in a file called COPYING or LICENSE. If you do not |
| have a copy of the license, write to the Free Software Foundation, |
| 59 Temple Place, Suite 330, Boston, MA 02111 USA. */ |
| #define READLINE_LIBRARY |
| |
| #if defined (HAVE_CONFIG_H) |
| # include <config.h> |
| #endif |
| |
| #include <sys/types.h> |
| |
| #include <stdio.h> |
| |
| #if defined (HAVE_UNISTD_H) |
| # include <unistd.h> |
| #endif |
| |
| #if defined (HAVE_STDLIB_H) |
| # include <stdlib.h> |
| #else |
| # include "ansi_stdlib.h" |
| #endif |
| |
| #include "rldefs.h" |
| #include "readline.h" |
| #include "history.h" |
| |
| #include "rlprivate.h" |
| #include "xmalloc.h" |
| |
| /* Variables exported to other files in the readline library. */ |
| unsigned char *_rl_isearch_terminators = (unsigned char *)NULL; |
| |
| /* Variables imported from other files in the readline library. */ |
| extern HIST_ENTRY *saved_line_for_history; |
| |
| /* Forward declarations */ |
| static int rl_search_history __P((int, int)); |
| |
| /* Last line found by the current incremental search, so we don't `find' |
| identical lines many times in a row. */ |
| static char *prev_line_found; |
| |
| /* Search backwards through the history looking for a string which is typed |
| interactively. Start with the current line. */ |
| int |
| rl_reverse_search_history (sign, key) |
| int sign, key; |
| { |
| return (rl_search_history (-sign, key)); |
| } |
| |
| /* Search forwards through the history looking for a string which is typed |
| interactively. Start with the current line. */ |
| int |
| rl_forward_search_history (sign, key) |
| int sign, key; |
| { |
| return (rl_search_history (sign, key)); |
| } |
| |
| /* Display the current state of the search in the echo-area. |
| SEARCH_STRING contains the string that is being searched for, |
| DIRECTION is zero for forward, or 1 for reverse, |
| WHERE is the history list number of the current line. If it is |
| -1, then this line is the starting one. */ |
| static void |
| rl_display_search (search_string, reverse_p, where) |
| char *search_string; |
| int reverse_p, where; |
| { |
| char *message; |
| int msglen, searchlen; |
| |
| searchlen = (search_string && *search_string) ? strlen (search_string) : 0; |
| |
| message = xmalloc (searchlen + 33); |
| msglen = 0; |
| |
| #if defined (NOTDEF) |
| if (where != -1) |
| { |
| sprintf (message, "[%d]", where + history_base); |
| msglen = strlen (message); |
| } |
| #endif /* NOTDEF */ |
| |
| message[msglen++] = '('; |
| |
| if (reverse_p) |
| { |
| strcpy (message + msglen, "reverse-"); |
| msglen += 8; |
| } |
| |
| strcpy (message + msglen, "i-search)`"); |
| msglen += 10; |
| |
| if (search_string) |
| { |
| strcpy (message + msglen, search_string); |
| msglen += searchlen; |
| } |
| |
| strcpy (message + msglen, "': "); |
| |
| rl_message ("%s", message, 0); |
| free (message); |
| (*rl_redisplay_function) (); |
| } |
| |
| /* Search through the history looking for an interactively typed string. |
| This is analogous to i-search. We start the search in the current line. |
| DIRECTION is which direction to search; >= 0 means forward, < 0 means |
| backwards. */ |
| static int |
| rl_search_history (direction, invoking_key) |
| int direction, invoking_key; |
| { |
| /* The string that the user types in to search for. */ |
| char *search_string; |
| |
| /* The current length of SEARCH_STRING. */ |
| int search_string_index; |
| |
| /* The amount of space that SEARCH_STRING has allocated to it. */ |
| int search_string_size; |
| |
| /* The list of lines to search through. */ |
| char **lines, *allocated_line; |
| |
| /* The length of LINES. */ |
| int hlen; |
| |
| /* Where we get LINES from. */ |
| HIST_ENTRY **hlist; |
| |
| register int i; |
| int orig_point, orig_line, last_found_line; |
| int c, found, failed, sline_len; |
| |
| /* The line currently being searched. */ |
| char *sline; |
| |
| /* Offset in that line. */ |
| int line_index; |
| |
| /* Non-zero if we are doing a reverse search. */ |
| int reverse; |
| |
| /* The list of characters which terminate the search, but are not |
| subsequently executed. If the variable isearch-terminators has |
| been set, we use that value, otherwise we use ESC and C-J. */ |
| unsigned char *isearch_terminators; |
| |
| orig_point = rl_point; |
| last_found_line = orig_line = where_history (); |
| reverse = direction < 0; |
| hlist = history_list (); |
| allocated_line = (char *)NULL; |
| |
| isearch_terminators = _rl_isearch_terminators ? _rl_isearch_terminators |
| : (unsigned char *)"\033\012"; |
| |
| /* Create an arrary of pointers to the lines that we want to search. */ |
| maybe_replace_line (); |
| i = 0; |
| if (hlist) |
| for (i = 0; hlist[i]; i++); |
| |
| /* Allocate space for this many lines, +1 for the current input line, |
| and remember those lines. */ |
| lines = (char **)xmalloc ((1 + (hlen = i)) * sizeof (char *)); |
| for (i = 0; i < hlen; i++) |
| lines[i] = hlist[i]->line; |
| |
| if (saved_line_for_history) |
| lines[i] = saved_line_for_history->line; |
| else |
| { |
| /* Keep track of this so we can free it. */ |
| allocated_line = xmalloc (1 + strlen (rl_line_buffer)); |
| strcpy (allocated_line, &rl_line_buffer[0]); |
| lines[i] = allocated_line; |
| } |
| |
| hlen++; |
| |
| /* The line where we start the search. */ |
| i = orig_line; |
| |
| rl_save_prompt (); |
| |
| /* Initialize search parameters. */ |
| search_string = xmalloc (search_string_size = 128); |
| *search_string = '\0'; |
| search_string_index = 0; |
| prev_line_found = (char *)0; /* XXX */ |
| |
| /* Normalize DIRECTION into 1 or -1. */ |
| direction = (direction >= 0) ? 1 : -1; |
| |
| rl_display_search (search_string, reverse, -1); |
| |
| sline = rl_line_buffer; |
| sline_len = strlen (sline); |
| line_index = rl_point; |
| |
| found = failed = 0; |
| for (;;) |
| { |
| Function *f = (Function *)NULL; |
| |
| /* Read a key and decide how to proceed. */ |
| c = rl_read_key (); |
| |
| if (_rl_keymap[c].type == ISFUNC) |
| { |
| f = _rl_keymap[c].function; |
| |
| if (f == rl_reverse_search_history) |
| c = reverse ? -1 : -2; |
| else if (f == rl_forward_search_history) |
| c = !reverse ? -1 : -2; |
| } |
| |
| #if 0 |
| /* Let NEWLINE (^J) terminate the search for people who don't like |
| using ESC. ^M can still be used to terminate the search and |
| immediately execute the command. */ |
| if (c == ESC || c == NEWLINE) |
| #else |
| /* The characters in isearch_terminators (set from the user-settable |
| variable isearch-terminators) are used to terminate the search but |
| not subsequently execute the character as a command. The default |
| value is "\033\012" (ESC and C-J). */ |
| if (strchr (isearch_terminators, c)) |
| #endif |
| { |
| /* ESC still terminates the search, but if there is pending |
| input or if input arrives within 0.1 seconds (on systems |
| with select(2)) it is used as a prefix character |
| with rl_execute_next. WATCH OUT FOR THIS! This is intended |
| to allow the arrow keys to be used like ^F and ^B are used |
| to terminate the search and execute the movement command. */ |
| if (c == ESC && _rl_input_available ()) /* XXX */ |
| rl_execute_next (ESC); |
| break; |
| } |
| |
| if (c >= 0 && (CTRL_CHAR (c) || META_CHAR (c) || c == RUBOUT) && c != CTRL ('G')) |
| { |
| rl_execute_next (c); |
| break; |
| } |
| |
| switch (c) |
| { |
| case -1: |
| if (search_string_index == 0) |
| continue; |
| else if (reverse) |
| --line_index; |
| else if (line_index != sline_len) |
| ++line_index; |
| else |
| ding (); |
| break; |
| |
| /* switch directions */ |
| case -2: |
| direction = -direction; |
| reverse = direction < 0; |
| break; |
| |
| case CTRL ('G'): |
| strcpy (rl_line_buffer, lines[orig_line]); |
| rl_point = orig_point; |
| rl_end = strlen (rl_line_buffer); |
| rl_restore_prompt(); |
| rl_clear_message (); |
| if (allocated_line) |
| free (allocated_line); |
| free (lines); |
| return 0; |
| |
| #if 0 |
| /* delete character from search string. */ |
| case -3: |
| if (search_string_index == 0) |
| ding (); |
| else |
| { |
| search_string[--search_string_index] = '\0'; |
| /* This is tricky. To do this right, we need to keep a |
| stack of search positions for the current search, with |
| sentinels marking the beginning and end. */ |
| } |
| break; |
| #endif |
| |
| default: |
| /* Add character to search string and continue search. */ |
| if (search_string_index + 2 >= search_string_size) |
| { |
| search_string_size += 128; |
| search_string = xrealloc (search_string, search_string_size); |
| } |
| search_string[search_string_index++] = c; |
| search_string[search_string_index] = '\0'; |
| break; |
| } |
| |
| for (found = failed = 0;;) |
| { |
| int limit = sline_len - search_string_index + 1; |
| |
| /* Search the current line. */ |
| while (reverse ? (line_index >= 0) : (line_index < limit)) |
| { |
| if (STREQN (search_string, sline + line_index, search_string_index)) |
| { |
| found++; |
| break; |
| } |
| else |
| line_index += direction; |
| } |
| if (found) |
| break; |
| |
| /* Move to the next line, but skip new copies of the line |
| we just found and lines shorter than the string we're |
| searching for. */ |
| do |
| { |
| /* Move to the next line. */ |
| i += direction; |
| |
| /* At limit for direction? */ |
| if (reverse ? (i < 0) : (i == hlen)) |
| { |
| failed++; |
| break; |
| } |
| |
| /* We will need these later. */ |
| sline = lines[i]; |
| sline_len = strlen (sline); |
| } |
| while ((prev_line_found && STREQ (prev_line_found, lines[i])) || |
| (search_string_index > sline_len)); |
| |
| if (failed) |
| break; |
| |
| /* Now set up the line for searching... */ |
| line_index = reverse ? sline_len - search_string_index : 0; |
| } |
| |
| if (failed) |
| { |
| /* We cannot find the search string. Ding the bell. */ |
| ding (); |
| i = last_found_line; |
| continue; /* XXX - was break */ |
| } |
| |
| /* We have found the search string. Just display it. But don't |
| actually move there in the history list until the user accepts |
| the location. */ |
| if (found) |
| { |
| int line_len; |
| |
| prev_line_found = lines[i]; |
| line_len = strlen (lines[i]); |
| |
| if (line_len >= rl_line_buffer_len) |
| rl_extend_line_buffer (line_len); |
| |
| strcpy (rl_line_buffer, lines[i]); |
| rl_point = line_index; |
| rl_end = line_len; |
| last_found_line = i; |
| rl_display_search (search_string, reverse, (i == orig_line) ? -1 : i); |
| } |
| } |
| |
| /* The searching is over. The user may have found the string that she |
| was looking for, or else she may have exited a failing search. If |
| LINE_INDEX is -1, then that shows that the string searched for was |
| not found. We use this to determine where to place rl_point. */ |
| |
| /* First put back the original state. */ |
| strcpy (rl_line_buffer, lines[orig_line]); |
| |
| rl_restore_prompt (); |
| |
| /* Free the search string. */ |
| free (search_string); |
| |
| if (last_found_line < orig_line) |
| rl_get_previous_history (orig_line - last_found_line, 0); |
| else |
| rl_get_next_history (last_found_line - orig_line, 0); |
| |
| /* If the string was not found, put point at the end of the line. */ |
| if (line_index < 0) |
| line_index = strlen (rl_line_buffer); |
| rl_point = line_index; |
| rl_clear_message (); |
| |
| if (allocated_line) |
| free (allocated_line); |
| free (lines); |
| |
| return 0; |
| } |