freebsd-dev/contrib/libreadline/isearch.c
1997-06-07 12:17:44 +00:00

419 lines
11 KiB
C

/* **************************************************************** */
/* */
/* 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 1, 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,
675 Mass Ave, Cambridge, MA 02139, 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"
/* Variables imported from other files in the readline library. */
extern Keymap _rl_keymap;
extern HIST_ENTRY *saved_line_for_history;
extern int rl_line_buffer_len;
extern int rl_point, rl_end;
extern char *rl_line_buffer;
extern void _rl_save_prompt ();
extern void _rl_restore_prompt ();
extern int rl_execute_next ();
extern void rl_extend_line_buffer ();
extern int _rl_input_available ();
extern char *xmalloc (), *xrealloc ();
static int rl_search_history ();
/* 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;
orig_point = rl_point;
last_found_line = orig_line = where_history ();
reverse = direction < 0;
hlist = history_list ();
allocated_line = (char *)NULL;
/* 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;
}
/* 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)
{
/* 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))
{
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;
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);
else
rl_get_next_history (last_found_line - orig_line);
/* 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;
}