272 lines
6.6 KiB
C
272 lines
6.6 KiB
C
/* search.c - code for non-incremental searching in emacs and vi modes. */
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/* Copyright (C) 1992 Free Software Foundation, Inc.
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This file is part of 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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#include <stdio.h>
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#if defined (__GNUC__)
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# define alloca __builtin_alloca
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#else
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# if defined (sparc) || defined (HAVE_ALLOCA_H)
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# include <alloca.h>
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# endif
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#endif
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#include "readline.h"
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#include "history.h"
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extern char *xmalloc (), *xrealloc ();
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/* Variables imported from readline.c */
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extern int rl_point, rl_end, rl_line_buffer_len;
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extern Keymap _rl_keymap;
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extern char *rl_prompt;
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extern char *rl_line_buffer;
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extern HIST_ENTRY *saved_line_for_history;
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static char *noninc_search_string = (char *) NULL;
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static int noninc_history_pos = 0;
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/* Search the history list for STRING starting at absolute history position
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POS. If STRING begins with `^', the search must match STRING at the
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beginning of a history line, otherwise a full substring match is performed
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for STRING. DIR < 0 means to search backwards through the history list,
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DIR >= 0 means to search forward. */
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static int
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noninc_search_from_pos (string, pos, dir)
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char *string;
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int pos, dir;
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{
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int ret, old;
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old = where_history ();
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history_set_pos (pos);
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if (*string == '^')
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ret = history_search_prefix (string + 1, dir);
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else
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ret = history_search (string, dir);
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if (ret != -1)
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ret = where_history ();
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history_set_pos (old);
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return (ret);
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}
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/* Search for a line in the history containing STRING. If DIR is < 0, the
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search is backwards through previous entries, else through subsequent
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entries. */
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static void
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noninc_dosearch (string, dir)
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char *string;
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int dir;
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{
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int oldpos, pos;
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HIST_ENTRY *entry;
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if (string == 0 || *string == 0 || noninc_history_pos < 0)
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{
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ding ();
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return;
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}
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pos = noninc_search_from_pos (string, noninc_history_pos + dir, dir);
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if (pos == -1)
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{
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/* Search failed, current history position unchanged. */
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maybe_unsave_line ();
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rl_clear_message ();
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rl_point = 0;
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ding ();
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return;
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}
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noninc_history_pos = pos;
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oldpos = where_history ();
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history_set_pos (noninc_history_pos);
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entry = current_history ();
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history_set_pos (oldpos);
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{
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int line_len;
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line_len = strlen (entry->line);
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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, entry->line);
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}
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rl_undo_list = (UNDO_LIST *)entry->data;
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rl_end = strlen (rl_line_buffer);
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rl_point = 0;
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rl_clear_message ();
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if (saved_line_for_history)
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free_history_entry (saved_line_for_history);
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saved_line_for_history = (HIST_ENTRY *)NULL;
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}
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/* Search non-interactively through the history list. DIR < 0 means to
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search backwards through the history of previous commands; otherwise
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the search is for commands subsequent to the current position in the
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history list. PCHAR is the character to use for prompting when reading
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the search string; if not specified (0), it defaults to `:'. */
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static void
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noninc_search (dir, pchar)
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int dir;
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int pchar;
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{
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int saved_point, c, pmtlen;
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char *p;
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maybe_save_line ();
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saved_point = rl_point;
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/* Use the line buffer to read the search string. */
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rl_line_buffer[0] = 0;
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rl_end = rl_point = 0;
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pmtlen = (rl_prompt && *rl_prompt) ? strlen (rl_prompt) : 0;
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p = (char *)alloca (2 + pmtlen);
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if (pmtlen)
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strcpy (p, rl_prompt);
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p[pmtlen] = pchar ? pchar : ':';
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p[pmtlen + 1] = '\0';
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rl_message (p, 0, 0);
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/* Read the search string. */
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while (c = rl_read_key ())
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{
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switch (c)
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{
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case CTRL('H'):
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case RUBOUT:
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if (rl_point == 0)
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{
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maybe_unsave_line ();
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rl_clear_message ();
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rl_point = saved_point;
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return;
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}
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/* FALLTHROUGH */
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case CTRL('W'):
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case CTRL('U'):
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rl_dispatch (c, _rl_keymap);
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break;
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case RETURN:
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case NEWLINE:
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goto dosearch;
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/* NOTREACHED */
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break;
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case CTRL('C'):
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case CTRL('G'):
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maybe_unsave_line ();
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rl_clear_message ();
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rl_point = saved_point;
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ding ();
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return;
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default:
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rl_insert (1, c);
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break;
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}
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rl_redisplay ();
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}
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dosearch:
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/* If rl_point == 0, we want to re-use the previous search string and
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start from the saved history position. If there's no previous search
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string, punt. */
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if (rl_point == 0)
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{
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if (!noninc_search_string)
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{
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ding ();
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return;
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}
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}
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else
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{
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/* We want to start the search from the current history position. */
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noninc_history_pos = where_history ();
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if (noninc_search_string)
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free (noninc_search_string);
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noninc_search_string = savestring (rl_line_buffer);
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}
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noninc_dosearch (noninc_search_string, dir);
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}
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/* Search forward through the history list for a string. If the vi-mode
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code calls this, KEY will be `?'. */
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rl_noninc_forward_search (count, key)
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int count, key;
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{
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if (key == '?')
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noninc_search (1, '?');
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else
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noninc_search (1, 0);
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}
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/* Reverse search the history list for a string. If the vi-mode code
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calls this, KEY will be `/'. */
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rl_noninc_reverse_search (count, key)
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int count, key;
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{
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if (key == '/')
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noninc_search (-1, '/');
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else
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noninc_search (-1, 0);
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}
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/* Search forward through the history list for the last string searched
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for. If there is no saved search string, abort. */
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rl_noninc_forward_search_again (count, key)
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int count, key;
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{
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if (!noninc_search_string)
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{
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ding ();
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return (-1);
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}
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noninc_dosearch (noninc_search_string, 1);
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}
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/* Reverse search in the history list for the last string searched
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for. If there is no saved search string, abort. */
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rl_noninc_reverse_search_again (count, key)
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int count, key;
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{
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if (!noninc_search_string)
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{
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ding ();
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return (-1);
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}
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noninc_dosearch (noninc_search_string, -1);
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}
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