629 lines
14 KiB
C
629 lines
14 KiB
C
/* kill.c -- kill ring management. */
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/* Copyright (C) 1994 Free Software Foundation, Inc.
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This file is part of the GNU Readline Library, a library for
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reading lines of text with interactive input and history editing.
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The GNU Readline Library is free software; you can redistribute it
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and/or modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2, or
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(at your option) any later version.
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The GNU Readline Library is distributed in the hope that it will be
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useful, but WITHOUT ANY WARRANTY; without even the implied warranty
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of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU 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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59 Temple Place, Suite 330, Boston, MA 02111 USA. */
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#define READLINE_LIBRARY
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#if defined (HAVE_CONFIG_H)
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# include <config.h>
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#endif
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#include <sys/types.h>
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#if defined (HAVE_UNISTD_H)
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# include <unistd.h> /* for _POSIX_VERSION */
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#endif /* HAVE_UNISTD_H */
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#if defined (HAVE_STDLIB_H)
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# include <stdlib.h>
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#else
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# include "ansi_stdlib.h"
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#endif /* HAVE_STDLIB_H */
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#include <stdio.h>
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/* System-specific feature definitions and include files. */
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#include "rldefs.h"
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/* Some standard library routines. */
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#include "readline.h"
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#include "history.h"
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#include "rlprivate.h"
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#include "xmalloc.h"
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/* **************************************************************** */
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/* */
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/* Killing Mechanism */
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/* */
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/* **************************************************************** */
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/* What we assume for a max number of kills. */
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#define DEFAULT_MAX_KILLS 10
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/* The real variable to look at to find out when to flush kills. */
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static int rl_max_kills = DEFAULT_MAX_KILLS;
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/* Where to store killed text. */
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static char **rl_kill_ring = (char **)NULL;
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/* Where we are in the kill ring. */
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static int rl_kill_index;
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/* How many slots we have in the kill ring. */
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static int rl_kill_ring_length;
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/* How to say that you only want to save a certain amount
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of kill material. */
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int
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rl_set_retained_kills (num)
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int num;
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{
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return 0;
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}
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/* Add TEXT to the kill ring, allocating a new kill ring slot as necessary.
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This uses TEXT directly, so the caller must not free it. If APPEND is
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non-zero, and the last command was a kill, the text is appended to the
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current kill ring slot, otherwise prepended. */
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static int
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_rl_copy_to_kill_ring (text, append)
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char *text;
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int append;
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{
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char *old, *new;
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int slot;
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/* First, find the slot to work with. */
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if (_rl_last_command_was_kill == 0)
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{
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/* Get a new slot. */
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if (rl_kill_ring == 0)
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{
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/* If we don't have any defined, then make one. */
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rl_kill_ring = (char **)
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xmalloc (((rl_kill_ring_length = 1) + 1) * sizeof (char *));
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rl_kill_ring[slot = 0] = (char *)NULL;
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}
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else
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{
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/* We have to add a new slot on the end, unless we have
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exceeded the max limit for remembering kills. */
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slot = rl_kill_ring_length;
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if (slot == rl_max_kills)
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{
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register int i;
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free (rl_kill_ring[0]);
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for (i = 0; i < slot; i++)
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rl_kill_ring[i] = rl_kill_ring[i + 1];
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}
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else
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{
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slot = rl_kill_ring_length += 1;
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rl_kill_ring = (char **)xrealloc (rl_kill_ring, slot * sizeof (char *));
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}
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rl_kill_ring[--slot] = (char *)NULL;
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}
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}
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else
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slot = rl_kill_ring_length - 1;
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/* If the last command was a kill, prepend or append. */
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if (_rl_last_command_was_kill && rl_editing_mode != vi_mode)
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{
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old = rl_kill_ring[slot];
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new = xmalloc (1 + strlen (old) + strlen (text));
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if (append)
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{
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strcpy (new, old);
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strcat (new, text);
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}
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else
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{
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strcpy (new, text);
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strcat (new, old);
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}
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free (old);
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free (text);
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rl_kill_ring[slot] = new;
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}
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else
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rl_kill_ring[slot] = text;
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rl_kill_index = slot;
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return 0;
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}
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/* The way to kill something. This appends or prepends to the last
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kill, if the last command was a kill command. if FROM is less
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than TO, then the text is appended, otherwise prepended. If the
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last command was not a kill command, then a new slot is made for
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this kill. */
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int
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rl_kill_text (from, to)
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int from, to;
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{
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char *text;
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/* Is there anything to kill? */
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if (from == to)
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{
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_rl_last_command_was_kill++;
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return 0;
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}
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text = rl_copy_text (from, to);
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/* Delete the copied text from the line. */
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rl_delete_text (from, to);
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_rl_copy_to_kill_ring (text, from < to);
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_rl_last_command_was_kill++;
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return 0;
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}
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/* Now REMEMBER! In order to do prepending or appending correctly, kill
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commands always make rl_point's original position be the FROM argument,
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and rl_point's extent be the TO argument. */
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/* **************************************************************** */
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/* */
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/* Killing Commands */
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/* */
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/* **************************************************************** */
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/* Delete the word at point, saving the text in the kill ring. */
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int
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rl_kill_word (count, key)
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int count, key;
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{
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int orig_point = rl_point;
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if (count < 0)
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return (rl_backward_kill_word (-count, key));
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else
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{
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rl_forward_word (count, key);
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if (rl_point != orig_point)
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rl_kill_text (orig_point, rl_point);
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rl_point = orig_point;
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}
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return 0;
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}
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/* Rubout the word before point, placing it on the kill ring. */
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int
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rl_backward_kill_word (count, ignore)
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int count, ignore;
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{
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int orig_point = rl_point;
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if (count < 0)
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return (rl_kill_word (-count, ignore));
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else
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{
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rl_backward_word (count, ignore);
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if (rl_point != orig_point)
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rl_kill_text (orig_point, rl_point);
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}
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return 0;
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}
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/* Kill from here to the end of the line. If DIRECTION is negative, kill
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back to the line start instead. */
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int
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rl_kill_line (direction, ignore)
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int direction, ignore;
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{
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int orig_point = rl_point;
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if (direction < 0)
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return (rl_backward_kill_line (1, ignore));
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else
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{
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rl_end_of_line (1, ignore);
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if (orig_point != rl_point)
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rl_kill_text (orig_point, rl_point);
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rl_point = orig_point;
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}
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return 0;
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}
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/* Kill backwards to the start of the line. If DIRECTION is negative, kill
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forwards to the line end instead. */
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int
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rl_backward_kill_line (direction, ignore)
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int direction, ignore;
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{
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int orig_point = rl_point;
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if (direction < 0)
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return (rl_kill_line (1, ignore));
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else
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{
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if (!rl_point)
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ding ();
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else
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{
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rl_beg_of_line (1, ignore);
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rl_kill_text (orig_point, rl_point);
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}
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}
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return 0;
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}
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/* Kill the whole line, no matter where point is. */
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int
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rl_kill_full_line (count, ignore)
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int count, ignore;
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{
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rl_begin_undo_group ();
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rl_point = 0;
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rl_kill_text (rl_point, rl_end);
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rl_end_undo_group ();
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return 0;
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}
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/* The next two functions mimic unix line editing behaviour, except they
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save the deleted text on the kill ring. This is safer than not saving
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it, and since we have a ring, nobody should get screwed. */
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/* This does what C-w does in Unix. We can't prevent people from
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using behaviour that they expect. */
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int
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rl_unix_word_rubout (count, key)
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int count, key;
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{
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int orig_point;
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if (rl_point == 0)
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ding ();
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else
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{
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orig_point = rl_point;
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if (count <= 0)
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count = 1;
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while (count--)
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{
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while (rl_point && whitespace (rl_line_buffer[rl_point - 1]))
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rl_point--;
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while (rl_point && (whitespace (rl_line_buffer[rl_point - 1]) == 0))
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rl_point--;
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}
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rl_kill_text (orig_point, rl_point);
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}
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return 0;
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}
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/* Here is C-u doing what Unix does. You don't *have* to use these
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key-bindings. We have a choice of killing the entire line, or
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killing from where we are to the start of the line. We choose the
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latter, because if you are a Unix weenie, then you haven't backspaced
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into the line at all, and if you aren't, then you know what you are
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doing. */
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int
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rl_unix_line_discard (count, key)
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int count, key;
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{
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if (rl_point == 0)
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ding ();
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else
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{
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rl_kill_text (rl_point, 0);
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rl_point = 0;
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}
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return 0;
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}
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/* Copy the text in the `region' to the kill ring. If DELETE is non-zero,
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delete the text from the line as well. */
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static int
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region_kill_internal (delete)
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int delete;
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{
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char *text;
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if (rl_mark == rl_point)
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{
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_rl_last_command_was_kill++;
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return 0;
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}
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text = rl_copy_text (rl_point, rl_mark);
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if (delete)
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rl_delete_text (rl_point, rl_mark);
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_rl_copy_to_kill_ring (text, rl_point < rl_mark);
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_rl_last_command_was_kill++;
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return 0;
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}
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/* Copy the text in the region to the kill ring. */
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int
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rl_copy_region_to_kill (count, ignore)
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int count, ignore;
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{
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return (region_kill_internal (0));
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}
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/* Kill the text between the point and mark. */
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int
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rl_kill_region (count, ignore)
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int count, ignore;
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{
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int r, npoint;
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npoint = (rl_point < rl_mark) ? rl_point : rl_mark;
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r = region_kill_internal (1);
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_rl_fix_point (1);
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rl_point = npoint;
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return r;
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}
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/* Copy COUNT words to the kill ring. DIR says which direction we look
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to find the words. */
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static int
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_rl_copy_word_as_kill (count, dir)
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int count, dir;
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{
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int om, op, r;
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om = rl_mark;
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op = rl_point;
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if (dir > 0)
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rl_forward_word (count, 0);
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else
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rl_backward_word (count, 0);
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rl_mark = rl_point;
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if (dir > 0)
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rl_backward_word (count, 0);
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else
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rl_forward_word (count, 0);
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r = region_kill_internal (0);
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rl_mark = om;
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rl_point = op;
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return r;
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}
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int
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rl_copy_forward_word (count, key)
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int count, key;
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{
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if (count < 0)
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return (rl_copy_backward_word (-count, key));
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return (_rl_copy_word_as_kill (count, 1));
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}
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int
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rl_copy_backward_word (count, key)
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int count, key;
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{
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if (count < 0)
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return (rl_copy_forward_word (-count, key));
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return (_rl_copy_word_as_kill (count, -1));
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}
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/* Yank back the last killed text. This ignores arguments. */
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int
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rl_yank (count, ignore)
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int count, ignore;
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{
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if (rl_kill_ring == 0)
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{
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_rl_abort_internal ();
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return -1;
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}
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_rl_set_mark_at_pos (rl_point);
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rl_insert_text (rl_kill_ring[rl_kill_index]);
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return 0;
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}
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/* If the last command was yank, or yank_pop, and the text just
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before point is identical to the current kill item, then
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delete that text from the line, rotate the index down, and
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yank back some other text. */
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int
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rl_yank_pop (count, key)
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int count, key;
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{
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int l, n;
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if (((rl_last_func != rl_yank_pop) && (rl_last_func != rl_yank)) ||
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!rl_kill_ring)
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{
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_rl_abort_internal ();
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return -1;
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}
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l = strlen (rl_kill_ring[rl_kill_index]);
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n = rl_point - l;
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if (n >= 0 && STREQN (rl_line_buffer + n, rl_kill_ring[rl_kill_index], l))
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{
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rl_delete_text (n, rl_point);
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rl_point = n;
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rl_kill_index--;
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if (rl_kill_index < 0)
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rl_kill_index = rl_kill_ring_length - 1;
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rl_yank (1, 0);
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return 0;
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}
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else
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{
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_rl_abort_internal ();
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return -1;
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}
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}
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/* Yank the COUNTh argument from the previous history line, skipping
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HISTORY_SKIP lines before looking for the `previous line'. */
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static int
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rl_yank_nth_arg_internal (count, ignore, history_skip)
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int count, ignore, history_skip;
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{
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register HIST_ENTRY *entry;
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char *arg;
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int i, pos;
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pos = where_history ();
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if (history_skip)
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{
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for (i = 0; i < history_skip; i++)
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entry = previous_history ();
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}
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entry = previous_history ();
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history_set_pos (pos);
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if (entry == 0)
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{
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ding ();
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return -1;
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}
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arg = history_arg_extract (count, count, entry->line);
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if (!arg || !*arg)
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{
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ding ();
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return -1;
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}
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rl_begin_undo_group ();
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#if defined (VI_MODE)
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/* Vi mode always inserts a space before yanking the argument, and it
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inserts it right *after* rl_point. */
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if (rl_editing_mode == vi_mode)
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{
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rl_vi_append_mode (1, ignore);
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rl_insert_text (" ");
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}
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#endif /* VI_MODE */
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rl_insert_text (arg);
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free (arg);
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rl_end_undo_group ();
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return 0;
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}
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/* Yank the COUNTth argument from the previous history line. */
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int
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rl_yank_nth_arg (count, ignore)
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int count, ignore;
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{
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return (rl_yank_nth_arg_internal (count, ignore, 0));
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}
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/* Yank the last argument from the previous history line. This `knows'
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how rl_yank_nth_arg treats a count of `$'. With an argument, this
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behaves the same as rl_yank_nth_arg. */
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int
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rl_yank_last_arg (count, key)
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int count, key;
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{
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static int history_skip = 0;
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static int explicit_arg_p = 0;
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static int count_passed = 1;
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static int direction = 1;
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static int undo_needed = 0;
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int retval;
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if (rl_last_func != rl_yank_last_arg)
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{
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history_skip = 0;
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explicit_arg_p = rl_explicit_arg;
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count_passed = count;
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direction = 1;
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}
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else
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{
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if (undo_needed)
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rl_do_undo ();
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if (count < 1)
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direction = -direction;
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history_skip += direction;
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if (history_skip < 0)
|
|
history_skip = 0;
|
|
}
|
|
|
|
if (explicit_arg_p)
|
|
retval = rl_yank_nth_arg_internal (count_passed, key, history_skip);
|
|
else
|
|
retval = rl_yank_nth_arg_internal ('$', key, history_skip);
|
|
|
|
undo_needed = retval == 0;
|
|
return retval;
|
|
}
|
|
|
|
/* A special paste command for users of Cygnus's cygwin32. */
|
|
#if defined (__CYGWIN32__)
|
|
#include <windows.h>
|
|
|
|
int
|
|
rl_paste_from_clipboard (count, key)
|
|
int count, key;
|
|
{
|
|
char *data, *ptr;
|
|
int len;
|
|
|
|
if (OpenClipboard (NULL) == 0)
|
|
return (0);
|
|
|
|
data = (char *)GetClipboardData (CF_TEXT);
|
|
if (data)
|
|
{
|
|
ptr = strchr (data, '\r');
|
|
if (ptr)
|
|
{
|
|
len = ptr - data;
|
|
ptr = xmalloc (len + 1);
|
|
ptr[len] = '\0';
|
|
strncpy (ptr, data, len);
|
|
}
|
|
else
|
|
ptr = data;
|
|
rl_insert_text (ptr);
|
|
if (ptr != data)
|
|
free (ptr);
|
|
CloseClipboard ();
|
|
}
|
|
return (0);
|
|
}
|
|
#endif /* __CYGWIN32__ */
|