--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/readline/kill.c	Thu May 22 20:59:27 1997 +0000
@@ -0,0 +1,552 @@
+/* kill.c -- kill ring management. */
+
+/* Copyright (C) 1994 Free Software Foundation, Inc.
+
+   This file is part of the GNU Readline Library, a library for
+   reading lines of text with interactive input and history editing.
+
+   The GNU Readline 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 GNU Readline 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>
+
+#if defined (HAVE_UNISTD_H)
+#  include <unistd.h>           /* for _POSIX_VERSION */
+#endif /* HAVE_UNISTD_H */
+
+#if defined (HAVE_STDLIB_H)
+#  include <stdlib.h>
+#else
+#  include "ansi_stdlib.h"
+#endif /* HAVE_STDLIB_H */
+
+#include <stdio.h>
+
+/* System-specific feature definitions and include files. */
+#include "rldefs.h"
+
+/* Some standard library routines. */
+#include "readline.h"
+#include "history.h"
+
+extern int _rl_last_command_was_kill;
+extern int rl_editing_mode;
+extern int rl_explicit_arg;
+extern Function *rl_last_func;
+
+extern void _rl_init_argument ();
+extern int _rl_set_mark_at_pos ();
+extern void _rl_fix_point ();
+extern void _rl_abort_internal ();
+
+extern char *xmalloc (), *xrealloc ();
+
+/* **************************************************************** */
+/*								    */
+/*			Killing Mechanism			    */
+/*								    */
+/* **************************************************************** */
+
+/* What we assume for a max number of kills. */
+#define DEFAULT_MAX_KILLS 10
+
+/* The real variable to look at to find out when to flush kills. */
+static int rl_max_kills =  DEFAULT_MAX_KILLS;
+
+/* Where to store killed text. */
+static char **rl_kill_ring = (char **)NULL;
+
+/* Where we are in the kill ring. */
+static int rl_kill_index;
+
+/* How many slots we have in the kill ring. */
+static int rl_kill_ring_length;
+
+/* How to say that you only want to save a certain amount
+   of kill material. */
+int
+rl_set_retained_kills (num)
+     int num;
+{
+  return 0;
+}
+
+/* Add TEXT to the kill ring, allocating a new kill ring slot as necessary.
+   This uses TEXT directly, so the caller must not free it.  If APPEND is
+   non-zero, and the last command was a kill, the text is appended to the
+   current kill ring slot, otherwise prepended. */
+static int
+_rl_copy_to_kill_ring (text, append)
+     char *text;
+     int append;
+{
+  char *old, *new;
+  int slot;
+
+  /* First, find the slot to work with. */
+  if (_rl_last_command_was_kill == 0)
+    {
+      /* Get a new slot.  */
+      if (rl_kill_ring == 0)
+	{
+	  /* If we don't have any defined, then make one. */
+	  rl_kill_ring = (char **)
+	    xmalloc (((rl_kill_ring_length = 1) + 1) * sizeof (char *));
+	  rl_kill_ring[slot = 0] = (char *)NULL;
+	}
+      else
+	{
+	  /* We have to add a new slot on the end, unless we have
+	     exceeded the max limit for remembering kills. */
+	  slot = rl_kill_ring_length;
+	  if (slot == rl_max_kills)
+	    {
+	      register int i;
+	      free (rl_kill_ring[0]);
+	      for (i = 0; i < slot; i++)
+		rl_kill_ring[i] = rl_kill_ring[i + 1];
+	    }
+	  else
+	    {
+	      slot = rl_kill_ring_length += 1;
+	      rl_kill_ring = (char **)xrealloc (rl_kill_ring, slot * sizeof (char *));
+	    }
+	  rl_kill_ring[--slot] = (char *)NULL;
+	}
+    }
+  else
+    slot = rl_kill_ring_length - 1;
+
+  /* If the last command was a kill, prepend or append. */
+  if (_rl_last_command_was_kill && rl_editing_mode != vi_mode)
+    {
+      old = rl_kill_ring[slot];
+      new = xmalloc (1 + strlen (old) + strlen (text));
+
+      if (append)
+	{
+	  strcpy (new, old);
+	  strcat (new, text);
+	}
+      else
+	{
+	  strcpy (new, text);
+	  strcat (new, old);
+	}
+      free (old);
+      free (text);
+      rl_kill_ring[slot] = new;
+    }
+  else
+    rl_kill_ring[slot] = text;
+
+  rl_kill_index = slot;
+  return 0;
+}
+
+/* The way to kill something.  This appends or prepends to the last
+   kill, if the last command was a kill command.  if FROM is less
+   than TO, then the text is appended, otherwise prepended.  If the
+   last command was not a kill command, then a new slot is made for
+   this kill. */
+int
+rl_kill_text (from, to)
+     int from, to;
+{
+  char *text;
+
+  /* Is there anything to kill? */
+  if (from == to)
+    {
+      _rl_last_command_was_kill++;
+      return 0;
+    }
+
+  text = rl_copy_text (from, to);
+
+  /* Delete the copied text from the line. */
+  rl_delete_text (from, to);
+
+  _rl_copy_to_kill_ring (text, from < to);
+
+  _rl_last_command_was_kill++;
+  return 0;
+}
+
+/* Now REMEMBER!  In order to do prepending or appending correctly, kill
+   commands always make rl_point's original position be the FROM argument,
+   and rl_point's extent be the TO argument. */
+
+/* **************************************************************** */
+/*								    */
+/*			Killing Commands			    */
+/*								    */
+/* **************************************************************** */
+
+/* Delete the word at point, saving the text in the kill ring. */
+int
+rl_kill_word (count, key)
+     int count, key;
+{
+  int orig_point = rl_point;
+
+  if (count < 0)
+    return (rl_backward_kill_word (-count, key));
+  else
+    {
+      rl_forward_word (count, key);
+
+      if (rl_point != orig_point)
+	rl_kill_text (orig_point, rl_point);
+
+      rl_point = orig_point;
+    }
+  return 0;
+}
+
+/* Rubout the word before point, placing it on the kill ring. */
+int
+rl_backward_kill_word (count, ignore)
+     int count, ignore;
+{
+  int orig_point = rl_point;
+
+  if (count < 0)
+    return (rl_kill_word (-count, ignore));
+  else
+    {
+      rl_backward_word (count, ignore);
+
+      if (rl_point != orig_point)
+	rl_kill_text (orig_point, rl_point);
+    }
+  return 0;
+}
+
+/* Kill from here to the end of the line.  If DIRECTION is negative, kill
+   back to the line start instead. */
+int
+rl_kill_line (direction, ignore)
+     int direction, ignore;
+{
+  int orig_point = rl_point;
+
+  if (direction < 0)
+    return (rl_backward_kill_line (1, ignore));
+  else
+    {
+      rl_end_of_line (1, ignore);
+      if (orig_point != rl_point)
+	rl_kill_text (orig_point, rl_point);
+      rl_point = orig_point;
+    }
+  return 0;
+}
+
+/* Kill backwards to the start of the line.  If DIRECTION is negative, kill
+   forwards to the line end instead. */
+int
+rl_backward_kill_line (direction, ignore)
+     int direction, ignore;
+{
+  int orig_point = rl_point;
+
+  if (direction < 0)
+    return (rl_kill_line (1, ignore));
+  else
+    {
+      if (!rl_point)
+	ding ();
+      else
+	{
+	  rl_beg_of_line (1, ignore);
+	  rl_kill_text (orig_point, rl_point);
+	}
+    }
+  return 0;
+}
+
+/* Kill the whole line, no matter where point is. */
+int
+rl_kill_full_line (count, ignore)
+     int count, ignore;
+{
+  rl_begin_undo_group ();
+  rl_point = 0;
+  rl_kill_text (rl_point, rl_end);
+  rl_end_undo_group ();
+  return 0;
+}
+
+/* The next two functions mimic unix line editing behaviour, except they
+   save the deleted text on the kill ring.  This is safer than not saving
+   it, and since we have a ring, nobody should get screwed. */
+
+/* This does what C-w does in Unix.  We can't prevent people from
+   using behaviour that they expect. */
+int
+rl_unix_word_rubout (count, key)
+     int count, key;
+{
+  int orig_point;
+
+  if (rl_point == 0)
+    ding ();
+  else
+    {
+      orig_point = rl_point;
+      if (count <= 0)
+	count = 1;
+
+      while (count--)
+	{
+	  while (rl_point && whitespace (rl_line_buffer[rl_point - 1]))
+	    rl_point--;
+
+	  while (rl_point && (whitespace (rl_line_buffer[rl_point - 1]) == 0))
+	    rl_point--;
+	}
+
+      rl_kill_text (orig_point, rl_point);
+    }
+  return 0;
+}
+
+/* Here is C-u doing what Unix does.  You don't *have* to use these
+   key-bindings.  We have a choice of killing the entire line, or
+   killing from where we are to the start of the line.  We choose the
+   latter, because if you are a Unix weenie, then you haven't backspaced
+   into the line at all, and if you aren't, then you know what you are
+   doing. */
+int
+rl_unix_line_discard (count, key)
+     int count, key;
+{
+  if (rl_point == 0)
+    ding ();
+  else
+    {
+      rl_kill_text (rl_point, 0);
+      rl_point = 0;
+    }
+  return 0;
+}
+
+/* Copy the text in the `region' to the kill ring.  If DELETE is non-zero,
+   delete the text from the line as well. */
+static int
+region_kill_internal (delete)
+     int delete;
+{
+  char *text;
+
+  if (rl_mark == rl_point)
+    {
+      _rl_last_command_was_kill++;
+      return 0;
+    }
+
+  text = rl_copy_text (rl_point, rl_mark);
+  if (delete)
+    rl_delete_text (rl_point, rl_mark);
+  _rl_copy_to_kill_ring (text, rl_point < rl_mark);
+
+  _rl_last_command_was_kill++;
+  return 0;
+}
+
+/* Copy the text in the region to the kill ring. */
+int
+rl_copy_region_to_kill (count, ignore)
+     int count, ignore;
+{
+  return (region_kill_internal (0));
+}
+
+/* Kill the text between the point and mark. */
+int
+rl_kill_region (count, ignore)
+     int count, ignore;
+{
+  int r;
+
+  r = region_kill_internal (1);
+  _rl_fix_point (1);
+  return r;
+}
+
+/* Copy COUNT words to the kill ring.  DIR says which direction we look
+   to find the words. */
+static int
+_rl_copy_word_as_kill (count, dir)
+     int count, dir;
+{
+  int om, op, r;
+
+  om = rl_mark;
+  op = rl_point;
+
+  if (dir > 0)
+    rl_forward_word (count, 0);
+  else
+    rl_backward_word (count, 0);
+
+  rl_mark = rl_point;
+
+  if (dir > 0)
+    rl_backward_word (count, 0);
+  else
+    rl_forward_word (count, 0);
+
+  r = region_kill_internal (0);
+
+  rl_mark = om;
+  rl_point = op;
+
+  return r;
+}
+
+int
+rl_copy_forward_word (count, key)
+     int count, key;
+{
+  if (count < 0)
+    return (rl_copy_backward_word (-count, key));
+
+  return (_rl_copy_word_as_kill (count, 1));
+}
+
+int
+rl_copy_backward_word (count, key)
+     int count, key;
+{
+  if (count < 0)
+    return (rl_copy_forward_word (-count, key));
+
+  return (_rl_copy_word_as_kill (count, -1));
+}
+  
+/* Yank back the last killed text.  This ignores arguments. */
+int
+rl_yank (count, ignore)
+     int count, ignore;
+{
+  if (rl_kill_ring == 0)
+    {
+      _rl_abort_internal ();
+      return -1;
+    }
+
+  _rl_set_mark_at_pos (rl_point);
+  rl_insert_text (rl_kill_ring[rl_kill_index]);
+  return 0;
+}
+
+/* If the last command was yank, or yank_pop, and the text just
+   before point is identical to the current kill item, then
+   delete that text from the line, rotate the index down, and
+   yank back some other text. */
+int
+rl_yank_pop (count, key)
+     int count, key;
+{
+  int l, n;
+
+  if (((rl_last_func != rl_yank_pop) && (rl_last_func != rl_yank)) ||
+      !rl_kill_ring)
+    {
+      _rl_abort_internal ();
+      return -1;
+    }
+
+  l = strlen (rl_kill_ring[rl_kill_index]);
+  n = rl_point - l;
+  if (n >= 0 && STREQN (rl_line_buffer + n, rl_kill_ring[rl_kill_index], l))
+    {
+      rl_delete_text (n, rl_point);
+      rl_point = n;
+      rl_kill_index--;
+      if (rl_kill_index < 0)
+	rl_kill_index = rl_kill_ring_length - 1;
+      rl_yank (1, 0);
+      return 0;
+    }
+  else
+    {
+      _rl_abort_internal ();
+      return -1;
+    }
+}
+
+/* Yank the COUNTth argument from the previous history line. */
+int
+rl_yank_nth_arg (count, ignore)
+     int count, ignore;
+{
+  register HIST_ENTRY *entry;
+  char *arg;
+
+  entry = previous_history ();
+  if (entry)
+    next_history ();
+  else
+    {
+      ding ();
+      return -1;
+    }
+
+  arg = history_arg_extract (count, count, entry->line);
+  if (!arg || !*arg)
+    {
+      ding ();
+      return -1;
+    }
+
+  rl_begin_undo_group ();
+
+#if defined (VI_MODE)
+  /* Vi mode always inserts a space before yanking the argument, and it
+     inserts it right *after* rl_point. */
+  if (rl_editing_mode == vi_mode)
+    {
+      rl_vi_append_mode (1, ignore);
+      rl_insert_text (" ");
+    }
+#endif /* VI_MODE */
+
+  rl_insert_text (arg);
+  free (arg);
+
+  rl_end_undo_group ();
+  return 0;
+}
+
+/* Yank the last argument from the previous history line.  This `knows'
+   how rl_yank_nth_arg treats a count of `$'.  With an argument, this
+   behaves the same as rl_yank_nth_arg. */
+int
+rl_yank_last_arg (count, key)
+     int count, key;
+{
+  if (rl_explicit_arg)
+    return (rl_yank_nth_arg (count, key));
+  else
+    return (rl_yank_nth_arg ('$', key));
+}