--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/cmds.c	Mon Aug 13 08:45:50 2007 +0200
@@ -0,0 +1,460 @@
+/* Simple built-in editing commands.
+   Copyright (C) 1985, 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
+
+This file is part of XEmacs.
+
+XEmacs 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 2, or (at your option) any
+later version.
+
+XEmacs 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.
+
+You should have received a copy of the GNU General Public License
+along with XEmacs; see the file COPYING.  If not, write to
+the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
+
+/* Synched up with: Mule 2.0, FSF 19.30. */
+
+#include <config.h>
+#include "lisp.h"
+#include "commands.h"
+#include "buffer.h"
+#include "syntax.h"
+#include "insdel.h"
+
+Lisp_Object Qkill_forward_chars;
+Lisp_Object Qself_insert_command;
+
+Lisp_Object Vblink_paren_function;
+
+/* A possible value for a buffer's overwrite-mode variable.  */
+Lisp_Object Qoverwrite_mode_binary;
+
+/* Non-nil means put this face on the next self-inserting character.  */
+Lisp_Object Vself_insert_face;
+
+/* This is the command that set up Vself_insert_face.  */
+Lisp_Object Vself_insert_face_command;
+
+
+DEFUN ("forward-char", Fforward_char, Sforward_char, 0, 2, "_p" /*
+Move point right ARG characters (left if ARG negative).
+On reaching end of buffer, stop and signal error.
+If BUFFER is nil, the current buffer is assumed.
+*/ )
+  (arg, buffer)
+     Lisp_Object arg, buffer;
+{
+  struct buffer *buf = decode_buffer (buffer, 1);
+
+  if (NILP (arg))
+    arg = make_int (1);
+  else
+    CHECK_INT (arg);
+
+  /* This used to just set point to point + XINT (arg), and then check
+     to see if it was within boundaries.  But now that SET_PT can
+     potentially do a lot of stuff (calling entering and exiting
+     hooks, etcetera), that's not a good approach.  So we validate the
+     proposed position, then set point.  */
+  {
+    Bufpos new_point = BUF_PT (buf) + XINT (arg);
+
+    if (new_point < BUF_BEGV (buf))
+      {
+	BUF_SET_PT (buf, BUF_BEGV (buf));
+	Fsignal (Qbeginning_of_buffer, Qnil);
+      }
+    if (new_point > BUF_ZV (buf))
+      {
+	BUF_SET_PT (buf, BUF_ZV (buf));
+	Fsignal (Qend_of_buffer, Qnil);
+      }
+
+    BUF_SET_PT (buf, new_point);
+  }
+
+  return Qnil;
+}
+
+DEFUN ("backward-char", Fbackward_char, Sbackward_char, 0, 2, "_p" /*
+Move point left ARG characters (right if ARG negative).
+On attempt to pass beginning or end of buffer, stop and signal error.
+If BUFFER is nil, the current buffer is assumed.
+*/ )
+  (arg, buffer)
+     Lisp_Object arg, buffer;
+{
+  if (NILP (arg))
+    arg = make_int (1);
+  else
+    CHECK_INT (arg);
+
+  XSETINT (arg, - XINT (arg));
+  return Fforward_char (arg, buffer);
+}
+
+DEFUN ("forward-line", Fforward_line, Sforward_line, 0, 2, "_p" /*
+Move ARG lines forward (backward if ARG is negative).
+Precisely, if point is on line I, move to the start of line I + ARG.
+If there isn't room, go as far as possible (no error).
+Returns the count of lines left to move.  If moving forward,
+that is ARG - number of lines moved; if backward, ARG + number moved.
+With positive ARG, a non-empty line at the end counts as one line
+  successfully moved (for the return value).
+If BUFFER is nil, the current buffer is assumed.
+*/ )
+  (arg, buffer)
+     Lisp_Object arg, buffer;
+{
+  struct buffer *buf = decode_buffer (buffer, 1);
+  Bufpos pos2 = BUF_PT (buf);
+  Bufpos pos;
+  int count, shortage, negp;
+
+  if (NILP (arg))
+    count = 1;
+  else
+    {
+      CHECK_INT (arg);
+      count = XINT (arg);
+    }
+
+  negp = count <= 0;
+  pos = scan_buffer (buf, '\n', pos2, 0, count - negp, &shortage, 1);
+  if (shortage > 0
+      && (negp
+	  || (BUF_ZV (buf) > BUF_BEGV (buf)
+	      && pos != pos2
+	      && BUF_FETCH_CHAR (buf, pos - 1) != '\n')))
+    shortage--;
+  BUF_SET_PT (buf, pos);
+  return make_int (negp ? - shortage : shortage);
+}
+
+DEFUN ("beginning-of-line", Fbeginning_of_line, Sbeginning_of_line,
+  0, 2, "_p" /*
+Move point to beginning of current line.
+With argument ARG not nil or 1, move forward ARG - 1 lines first.
+If scan reaches end of buffer, stop there without error.
+If BUFFER is nil, the current buffer is assumed.
+*/ )
+  (arg, buffer)
+     Lisp_Object arg, buffer;
+{
+  struct buffer *b = decode_buffer (buffer, 1);
+
+  XSETBUFFER (buffer, b);
+  if (NILP (arg))
+    arg = make_int (1);
+  else
+    CHECK_INT (arg);
+
+  Fforward_line (make_int (XINT (arg) - 1), buffer);
+  return Qnil;
+}
+
+DEFUN ("end-of-line", Fend_of_line, Send_of_line,
+  0, 2, "_p" /*
+Move point to end of current line.
+With argument ARG not nil or 1, move forward ARG - 1 lines first.
+If scan reaches end of buffer, stop there without error.
+If BUFFER is nil, the current buffer is assumed.
+*/ )
+  (arg, buffer)
+     Lisp_Object arg, buffer;
+{
+  struct buffer *buf = decode_buffer (buffer, 1);
+
+  XSETBUFFER (buffer, buf);
+
+  if (NILP (arg))
+    arg = make_int (1);
+  else
+    CHECK_INT (arg);
+
+  BUF_SET_PT (buf, find_before_next_newline (buf, BUF_PT (buf), 0,
+					     XINT (arg) - (XINT (arg) <= 0)));
+  return Qnil;
+}
+
+DEFUN ("delete-char", Fdelete_char, Sdelete_char, 1, 2, "*p\nP" /*
+Delete the following ARG characters (previous, with negative arg).
+Optional second arg KILLFLAG non-nil means kill instead (save in kill ring).
+Interactively, ARG is the prefix arg, and KILLFLAG is set if
+ARG was explicitly specified.
+*/ )
+  (arg, killflag)
+     Lisp_Object arg, killflag;
+{
+  /* This function can GC */
+  Bufpos pos;
+  struct buffer *buf = current_buffer;
+
+  CHECK_INT (arg);
+
+  pos = BUF_PT (buf) + XINT (arg);
+  if (NILP (killflag))
+    {
+      if (XINT (arg) < 0)
+	{
+	  if (pos < BUF_BEGV (buf))
+	    signal_error (Qbeginning_of_buffer, Qnil);
+	  else
+	    buffer_delete_range (buf, pos, BUF_PT (buf), 0);
+	}
+      else
+	{
+	  if (pos > BUF_ZV (buf))
+	    signal_error (Qend_of_buffer, Qnil);
+	  else
+	    buffer_delete_range (buf, BUF_PT (buf), pos, 0);
+	}
+    }
+  else
+    {
+      call1 (Qkill_forward_chars, arg);
+    }
+  return Qnil;
+}
+
+DEFUN ("delete-backward-char", Fdelete_backward_char, Sdelete_backward_char,
+  1, 2, "*p\nP" /*
+Delete the previous ARG characters (following, with negative ARG).
+Optional second arg KILLFLAG non-nil means kill instead (save in kill ring).
+Interactively, ARG is the prefix arg, and KILLFLAG is set if
+ARG was explicitly specified.
+*/ )
+  (arg, killflag)
+     Lisp_Object arg, killflag;
+{
+  /* This function can GC */
+  CHECK_INT (arg);
+  return Fdelete_char (make_int (-XINT (arg)), killflag);
+}
+
+static void internal_self_insert (Emchar ch, int noautofill);
+
+DEFUN ("self-insert-command", Fself_insert_command, Sself_insert_command, 1, 1, "*p" /*
+Insert the character you type.
+Whichever character you type to run this command is inserted.
+*/ )
+  (arg)
+     Lisp_Object arg;
+{
+  /* This function can GC */
+  int n;
+  Emchar ch;
+  Lisp_Object c;
+  CHECK_INT (arg);
+
+  if (CHAR_OR_CHAR_INTP (Vlast_command_char))
+    c = Vlast_command_char;
+  else
+    c = Fevent_to_character (Vlast_command_event, Qnil, Qnil, Qt);
+
+  if (NILP (c))
+    signal_simple_error ("last typed character has no ASCII equivalent",
+                         Fcopy_event (Vlast_command_event, Qnil));
+
+  CHECK_CHAR_COERCE_INT (c);
+
+  n = XINT (arg);
+  ch = XCHAR (c);
+#if 0 /* FSFmacs */
+  /* #### This optimization won't work because of differences in
+     how the start-open and end-open properties default for text
+     properties.  See internal_self_insert(). */
+  if (n >= 2 && NILP (current_buffer->overwrite_mode))
+    {
+      n -= 2;
+      /* The first one might want to expand an abbrev.  */
+      internal_self_insert (c, 1);
+      /* The bulk of the copies of this char can be inserted simply.
+	 We don't have to handle a user-specified face specially
+	 because it will get inherited from the first char inserted.  */
+      Finsert_char (make_char (c), make_int (n), Qt, Qnil);
+      /* The last one might want to auto-fill.  */
+      internal_self_insert (c, 0);
+    }
+  else
+#endif /* 0 */
+    while (n > 0)
+      {
+	n--;
+	internal_self_insert (ch, (n != 0));
+      }
+  return Qnil;
+}
+
+/* Insert character C1.  If NOAUTOFILL is nonzero, don't do autofill
+   even if it is enabled.
+
+   FSF:
+
+   If this insertion is suitable for direct output (completely simple),
+   return 0.  A value of 1 indicates this *might* not have been simple.
+   A value of 2 means this did things that call for an undo boundary.  */
+
+static void
+internal_self_insert (Emchar c1, int noautofill)
+{
+  /* This function can GC */
+  /* int hairy = 0; -- unused */
+  REGISTER enum syntaxcode synt;
+  REGISTER Emchar c2;
+  Lisp_Object overwrite;
+  Lisp_Object syntax_table;
+  struct buffer *buf = current_buffer;
+  
+  overwrite = buf->overwrite_mode;
+  syntax_table = buf->syntax_table;
+
+#if 0
+  /* No, this is very bad, it makes undo *always* undo a character at a time
+     instead of grouping consecutive self-inserts together.  Nasty nasty.
+   */
+  if (!NILP (Vbefore_change_functions) || !NILP (Vafter_change_functions)
+      || !NILP (Vbefore_change_function) || !NILP (Vafter_change_function))
+    hairy = 1;
+#endif
+
+  if (!NILP (overwrite)
+      && BUF_PT (buf) < BUF_ZV (buf)
+      && (EQ (overwrite, Qoverwrite_mode_binary)
+	  || (c1 != '\n' && BUF_FETCH_CHAR (buf, BUF_PT (buf)) != '\n'))
+      && (EQ (overwrite, Qoverwrite_mode_binary)
+          || BUF_FETCH_CHAR (buf, BUF_PT (buf)) != '\t'
+	  || XINT (buf->tab_width) <= 0
+	  || XINT (buf->tab_width) > 20
+	  || !((current_column (buf) + 1) % XINT (buf->tab_width))))
+    {
+      buffer_delete_range (buf, BUF_PT (buf), BUF_PT (buf) + 1, 0);
+      /* hairy = 2; */
+    }
+
+  if (!NILP (buf->abbrev_mode)
+      && !WORD_SYNTAX_P (syntax_table, c1)
+      && NILP (buf->read_only)
+      && BUF_PT (buf) > BUF_BEGV (buf))
+    {
+      c2 = BUF_FETCH_CHAR (buf, BUF_PT (buf) - 1);
+
+      if (WORD_SYNTAX_P (syntax_table, c2))
+	{
+	  /* int modiff = BUF_MODIFF (current_buffer); */
+	  Fexpand_abbrev ();
+	  /* We can't trust the value of Fexpand_abbrev,
+	     but if Fexpand_abbrev changed the buffer,
+	     assume it expanded something.  */
+	  /* if (BUF_MODIFF (buf) != modiff)
+	     hairy = 2; */
+        }
+    }
+  if ((c1 == ' ' || c1 == '\n')
+      && !noautofill
+      && !NILP (buf->auto_fill_function))
+    {
+      buffer_insert_emacs_char (buf, c1);
+      if (c1 == '\n')
+	/* After inserting a newline, move to previous line and fill */
+	/* that.  Must have the newline in place already so filling and */
+	/* justification, if any, know where the end is going to be. */
+	BUF_SET_PT (buf, BUF_PT (buf) - 1);
+      call0 (buf->auto_fill_function);
+      if (c1 == '\n')
+	BUF_SET_PT (buf, BUF_PT (buf) + 1);
+      /* hairy = 2; */
+    }
+  else
+    buffer_insert_emacs_char (buf, c1);
+
+  /* If previous command specified a face to use, use it.  */
+  if (!NILP (Vself_insert_face)
+      && EQ (Vlast_command, Vself_insert_face_command))
+    {
+      Lisp_Object before, after;
+      XSETINT (before, BUF_PT (buf) - 1);
+      XSETINT (after, BUF_PT (buf));
+      Fput_text_property (before, after, Qface, Vself_insert_face, Qnil);
+      Fput_text_property (before, after, Qstart_open, Qt, Qnil);
+      Fput_text_property (before, after, Qend_open, Qnil, Qnil);
+      /* #### FSFmacs properties are normally closed ("sticky") on the
+	 end but not the beginning.  It's the opposite for us. */
+      Vself_insert_face = Qnil;
+    }
+  synt = SYNTAX (syntax_table, c1);
+  if ((synt == Sclose || synt == Smath)
+      && !NILP (Vblink_paren_function) && INTERACTIVE
+      && !noautofill)
+    {
+      call0 (Vblink_paren_function);
+      /* hairy = 2; */
+    }
+
+  /* return hairy; */
+}
+
+/* (this comes from Mule but is a generally good idea) */
+
+DEFUN ("self-insert-internal", Fself_insert_internal, Sself_insert_internal,
+       1, 1, 0 /*
+Invoke `self-insert-command' as if CH is entered from keyboard.
+*/ )
+  (ch)
+     Lisp_Object ch;
+{
+  /* This function can GC */
+  CHECK_CHAR_COERCE_INT (ch);
+  internal_self_insert (XCHAR (ch), 0);
+  return Qnil;
+}
+
+/* module initialization */
+
+void
+syms_of_cmds (void)
+{
+  defsymbol (&Qkill_forward_chars, "kill-forward-chars");
+  defsymbol (&Qself_insert_command, "self-insert-command");
+  defsymbol (&Qoverwrite_mode_binary, "overwrite-mode-binary");
+
+  defsubr (&Sforward_char);
+  defsubr (&Sbackward_char);
+  defsubr (&Sforward_line);
+  defsubr (&Sbeginning_of_line);
+  defsubr (&Send_of_line);
+
+  defsubr (&Sdelete_char);
+  defsubr (&Sdelete_backward_char);
+
+  defsubr (&Sself_insert_command);
+  defsubr (&Sself_insert_internal);
+}
+
+void
+vars_of_cmds (void)
+{
+  DEFVAR_LISP ("self-insert-face", &Vself_insert_face /*
+If non-nil, set the face of the next self-inserting character to this.
+See also `self-insert-face-command'.
+*/ );
+  Vself_insert_face = Qnil;
+
+  DEFVAR_LISP ("self-insert-face-command", &Vself_insert_face_command /*
+This is the command that set up `self-insert-face'.
+If `last-command' does not equal this value, we ignore `self-insert-face'.
+*/ );
+  Vself_insert_face_command = Qnil;
+
+  DEFVAR_LISP ("blink-paren-function", &Vblink_paren_function /*
+Function called, if non-nil, whenever a close parenthesis is inserted.
+More precisely, a char with closeparen syntax is self-inserted.
+*/ );
+  Vblink_paren_function = Qnil;
+}