379 lines
9.5 KiB
C
379 lines
9.5 KiB
C
/* **************************************************************** */
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/* */
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/* I-Search and Searching */
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/* */
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/* **************************************************************** */
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/* Copyright (C) 1987,1989 Free Software Foundation, Inc.
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This file contains the Readline Library (the Library), a set of
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routines for providing Emacs style line input to programs that ask
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for it.
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The Library is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 1, or (at your option)
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any later version.
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The Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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The GNU General Public License is often shipped with GNU software, and
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is generally kept in a file called COPYING or LICENSE. If you do not
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have a copy of the license, write to the Free Software Foundation,
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675 Mass Ave, Cambridge, MA 02139, USA. */
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#define READLINE_LIBRARY
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#include <stdio.h>
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#if defined (HAVE_UNISTD_H)
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# include <unistd.h>
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#endif
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#include "memalloc.h"
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#include "readline.h"
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#include "history.h"
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#define STREQ(a, b) (((a)[0] == (b)[0]) && (strcmp ((a), (b)) == 0))
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#define STREQN(a, b, n) (((a)[0] == (b)[0]) && (strncmp ((a), (b), (n)) == 0))
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/* Variables imported from other files in the readline library. */
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extern Keymap _rl_keymap;
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extern HIST_ENTRY *saved_line_for_history;
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extern int rl_line_buffer_len;
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extern int rl_point, rl_end;
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extern char *rl_line_buffer;
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extern char *xmalloc (), *xrealloc ();
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static int rl_search_history ();
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/* Last line found by the current incremental search, so we don't `find'
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identical lines many times in a row. */
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static char *prev_line_found;
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/* Search backwards through the history looking for a string which is typed
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interactively. Start with the current line. */
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rl_reverse_search_history (sign, key)
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int sign;
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int key;
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{
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return (rl_search_history (-sign, key));
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}
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/* Search forwards through the history looking for a string which is typed
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interactively. Start with the current line. */
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rl_forward_search_history (sign, key)
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int sign;
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int key;
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{
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return (rl_search_history (sign, key));
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}
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/* Display the current state of the search in the echo-area.
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SEARCH_STRING contains the string that is being searched for,
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DIRECTION is zero for forward, or 1 for reverse,
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WHERE is the history list number of the current line. If it is
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-1, then this line is the starting one. */
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static void
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rl_display_search (search_string, reverse_p, where)
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char *search_string;
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int reverse_p, where;
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{
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char *message;
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message = xmalloc (1 + (search_string ? strlen (search_string) : 0) + 30);
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*message = '\0';
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#if defined (NOTDEF)
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if (where != -1)
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sprintf (message, "[%d]", where + history_base);
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#endif /* NOTDEF */
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strcat (message, "(");
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if (reverse_p)
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strcat (message, "reverse-");
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strcat (message, "i-search)`");
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if (search_string)
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strcat (message, search_string);
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strcat (message, "': ");
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rl_message ("%s", message, 0);
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free (message);
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rl_redisplay ();
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}
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/* Search through the history looking for an interactively typed string.
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This is analogous to i-search. We start the search in the current line.
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DIRECTION is which direction to search; >= 0 means forward, < 0 means
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backwards. */
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static int
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rl_search_history (direction, invoking_key)
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int direction;
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int invoking_key;
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{
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/* The string that the user types in to search for. */
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char *search_string;
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/* The current length of SEARCH_STRING. */
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int search_string_index;
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/* The amount of space that SEARCH_STRING has allocated to it. */
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int search_string_size;
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/* The list of lines to search through. */
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char **lines, *allocated_line = (char *)NULL;
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/* The length of LINES. */
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int hlen;
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/* Where we get LINES from. */
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HIST_ENTRY **hlist = history_list ();
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register int i = 0;
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int orig_point = rl_point;
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int orig_line = where_history ();
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int last_found_line = orig_line;
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int c, done = 0, found, failed, sline_len;
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/* The line currently being searched. */
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char *sline;
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/* Offset in that line. */
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int line_index;
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/* Non-zero if we are doing a reverse search. */
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int reverse = (direction < 0);
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/* Create an arrary of pointers to the lines that we want to search. */
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maybe_replace_line ();
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if (hlist)
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for (i = 0; hlist[i]; i++);
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/* Allocate space for this many lines, +1 for the current input line,
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and remember those lines. */
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lines = (char **)xmalloc ((1 + (hlen = i)) * sizeof (char *));
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for (i = 0; i < hlen; i++)
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lines[i] = hlist[i]->line;
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if (saved_line_for_history)
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lines[i] = saved_line_for_history->line;
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else
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{
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/* Keep track of this so we can free it. */
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allocated_line = xmalloc (1 + strlen (rl_line_buffer));
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strcpy (allocated_line, &rl_line_buffer[0]);
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lines[i] = allocated_line;
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}
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hlen++;
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/* The line where we start the search. */
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i = orig_line;
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/* Initialize search parameters. */
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search_string = xmalloc (search_string_size = 128);
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*search_string = '\0';
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search_string_index = 0;
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prev_line_found = (char *)0; /* XXX */
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/* Normalize DIRECTION into 1 or -1. */
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direction = (direction >= 0) ? 1 : -1;
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rl_display_search (search_string, reverse, -1);
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sline = rl_line_buffer;
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sline_len = strlen (sline);
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line_index = rl_point;
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found = failed = 0;
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while (!done)
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{
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Function *f = (Function *)NULL;
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/* Read a key and decide how to proceed. */
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c = rl_read_key ();
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/* Hack C to Do What I Mean. */
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if (_rl_keymap[c].type == ISFUNC)
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{
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f = _rl_keymap[c].function;
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if (f == rl_reverse_search_history)
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c = reverse ? -1 : -2;
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else if (f == rl_forward_search_history)
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c = !reverse ? -1 : -2;
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}
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switch (c)
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{
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case ESC:
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done = 1;
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continue;
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case -1:
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if (!search_string_index)
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continue;
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else
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{
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if (reverse)
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--line_index;
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else
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{
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if (line_index != sline_len)
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++line_index;
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else
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ding ();
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}
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}
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break;
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/* switch directions */
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case -2:
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direction = -direction;
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reverse = (direction < 0);
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break;
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case CTRL ('G'):
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strcpy (rl_line_buffer, lines[orig_line]);
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rl_point = orig_point;
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rl_end = strlen (rl_line_buffer);
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rl_clear_message ();
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free (allocated_line);
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free (lines);
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return 0;
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default:
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if (CTRL_CHAR (c) || META_CHAR (c) || c == RUBOUT)
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{
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rl_execute_next (c);
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done = 1;
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continue;
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}
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else
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{
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/* Add character to search string and continue search. */
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if (search_string_index + 2 >= search_string_size)
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{
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search_string_size += 128;
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search_string = xrealloc (search_string, search_string_size);
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}
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search_string[search_string_index++] = c;
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search_string[search_string_index] = '\0';
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break;
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}
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}
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found = failed = 0;
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while (1)
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{
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int limit = sline_len - search_string_index + 1;
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/* Search the current line. */
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while (reverse ? (line_index >= 0) : (line_index < limit))
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{
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if (STREQN(search_string, sline + line_index, search_string_index))
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{
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found++;
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break;
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}
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else
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line_index += direction;
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}
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if (found)
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break;
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/* Move to the next line, but skip new copies of the line
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we just found and lines shorter than the string we're
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searching for. */
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do
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{
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/* Move to the next line. */
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i += direction;
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/* At limit for direction? */
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if (reverse ? (i < 0) : (i == hlen))
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{
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failed++;
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break;
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}
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/* We will need these later. */
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sline = lines[i];
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sline_len = strlen (sline);
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}
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while ((prev_line_found && STREQ (prev_line_found, lines[i])) ||
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(search_string_index > sline_len));
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if (failed)
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break;
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/* Now set up the line for searching... */
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if (reverse)
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line_index = sline_len - search_string_index;
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else
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line_index = 0;
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}
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if (failed)
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{
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/* We cannot find the search string. Ding the bell. */
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ding ();
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i = last_found_line;
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continue; /* XXX - was break */
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}
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/* We have found the search string. Just display it. But don't
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actually move there in the history list until the user accepts
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the location. */
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if (found)
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{
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int line_len;
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prev_line_found = lines[i];
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line_len = strlen (lines[i]);
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if (line_len >= rl_line_buffer_len)
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rl_extend_line_buffer (line_len);
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strcpy (rl_line_buffer, lines[i]);
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rl_point = line_index;
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rl_end = line_len;
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last_found_line = i;
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rl_display_search (search_string, reverse, (i == orig_line) ? -1 : i);
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}
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}
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/* The searching is over. The user may have found the string that she
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was looking for, or else she may have exited a failing search. If
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LINE_INDEX is -1, then that shows that the string searched for was
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not found. We use this to determine where to place rl_point. */
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/* First put back the original state. */
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strcpy (rl_line_buffer, lines[orig_line]);
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/* Free the search string. */
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free (search_string);
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if (last_found_line < orig_line)
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rl_get_previous_history (orig_line - last_found_line);
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else
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rl_get_next_history (last_found_line - orig_line);
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/* If the string was not found, put point at the end of the line. */
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if (line_index < 0)
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line_index = strlen (rl_line_buffer);
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rl_point = line_index;
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rl_clear_message ();
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free (allocated_line);
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free (lines);
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return 0;
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}
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