--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/cmds.c	Mon Aug 13 11:28:15 2007 +0200
@@ -0,0 +1,501 @@
+/* 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 Qno_self_insert;
+
+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, 0, 2, "_p", /*
+Move point right N characters (left if N negative).
+On attempt to pass end of buffer, stop and signal `end-of-buffer'.
+On attempt to pass beginning of buffer, stop and signal `beginning-of-buffer'.
+On reaching end of buffer, stop and signal error.
+*/
+       (n, buffer))
+{
+  struct buffer *buf = decode_buffer (buffer, 1);
+  EMACS_INT count;
+
+  if (NILP (n))
+    count = 1;
+  else
+    {
+      CHECK_INT (n);
+      count = XINT (n);
+    }
+
+  /* This used to just set point to point + XINT (n), 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) + count;
+
+    if (new_point < BUF_BEGV (buf))
+      {
+	BUF_SET_PT (buf, BUF_BEGV (buf));
+	Fsignal (Qbeginning_of_buffer, Qnil);
+	return Qnil;
+      }
+    if (new_point > BUF_ZV (buf))
+      {
+	BUF_SET_PT (buf, BUF_ZV (buf));
+	Fsignal (Qend_of_buffer, Qnil);
+	return Qnil;
+      }
+
+    BUF_SET_PT (buf, new_point);
+  }
+
+  return Qnil;
+}
+
+DEFUN ("backward-char", Fbackward_char, 0, 2, "_p", /*
+Move point left N characters (right if N negative).
+On attempt to pass end of buffer, stop and signal `end-of-buffer'.
+On attempt to pass beginning of buffer, stop and signal `beginning-of-buffer'.
+*/
+       (n, buffer))
+{
+  if (NILP (n))
+    n = make_int (-1);
+  else
+    {
+      CHECK_INT (n);
+      XSETINT (n, - XINT (n));
+    }
+  return Fforward_char (n, buffer);
+}
+
+DEFUN ("forward-line", Fforward_line, 0, 2, "_p", /*
+Move N lines forward (backward if N is negative).
+Precisely, if point is on line I, move to the start of line I + N.
+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 N - number of lines moved; if backward, N + number moved.
+With positive N, 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.
+*/
+       (n, buffer))
+{
+  struct buffer *buf = decode_buffer (buffer, 1);
+  Bufpos pos2 = BUF_PT (buf);
+  Bufpos pos;
+  EMACS_INT count, shortage, negp;
+
+  if (NILP (n))
+    count = 1;
+  else
+    {
+      CHECK_INT (n);
+      count = XINT (n);
+    }
+
+  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 ("point-at-bol", Fpoint_at_bol, 0, 2, 0, /*
+Return the character position of the first character on the current line.
+With argument N not nil or 1, move forward N - 1 lines first.
+If scan reaches end of buffer, return that position.
+This function does not move point.
+*/
+       (n, buffer))
+{
+  struct buffer *b = decode_buffer (buffer, 1);
+  REGISTER int orig, end;
+
+  XSETBUFFER (buffer, b);
+  if (NILP (n))
+    n = make_int (0);
+  else
+    {
+      CHECK_INT (n);
+      n = make_int (XINT (n) - 1);
+    }
+
+  orig = BUF_PT (b);
+  Fforward_line (n, buffer);
+  end = BUF_PT (b);
+  BUF_SET_PT (b, orig);
+
+  return make_int (end);
+}
+
+DEFUN ("beginning-of-line", Fbeginning_of_line, 0, 2, "_p", /*
+Move point to beginning of current line.
+With argument N not nil or 1, move forward N - 1 lines first.
+If scan reaches end of buffer, stop there without error.
+If BUFFER is nil, the current buffer is assumed.
+*/
+       (n, buffer))
+{
+  struct buffer *b = decode_buffer (buffer, 1);
+
+  BUF_SET_PT (b, XINT (Fpoint_at_bol (n, buffer)));
+  return Qnil;
+}
+
+DEFUN ("point-at-eol", Fpoint_at_eol, 0, 2, 0, /*
+Return the character position of the last character on the current line.
+With argument N not nil or 1, move forward N - 1 lines first.
+If scan reaches end of buffer, return that position.
+This function does not move point.
+*/
+       (n, buffer))
+{
+  struct buffer *buf = decode_buffer (buffer, 1);
+  int count;
+
+  if (NILP (n))
+    count = 1;
+  else
+    {
+      CHECK_INT (n);
+      count = XINT (n);
+    }
+
+  return make_int (find_before_next_newline (buf, BUF_PT (buf), 0,
+					     count - (count <= 0)));
+}
+
+DEFUN ("end-of-line", Fend_of_line, 0, 2, "_p", /*
+Move point to end of current line.
+With argument N not nil or 1, move forward N - 1 lines first.
+If scan reaches end of buffer, stop there without error.
+If BUFFER is nil, the current buffer is assumed.
+*/
+       (n, buffer))
+{
+  struct buffer *b = decode_buffer (buffer, 1);
+
+  BUF_SET_PT (b, XINT (Fpoint_at_eol (n, buffer)));
+  return Qnil;
+}
+
+DEFUN ("delete-char", Fdelete_char, 1, 2, "*p\nP", /*
+Delete the following N characters (previous, with negative N).
+Optional second arg KILLFLAG non-nil means kill instead (save in kill ring).
+Interactively, N is the prefix arg, and KILLFLAG is set if
+N was explicitly specified.
+*/
+       (n, killflag))
+{
+  /* This function can GC */
+  Bufpos pos;
+  struct buffer *buf = current_buffer;
+  int count;
+
+  CHECK_INT (n);
+  count = XINT (n);
+
+  pos = BUF_PT (buf) + count;
+  if (NILP (killflag))
+    {
+      if (count < 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, n);
+    }
+  return Qnil;
+}
+
+DEFUN ("delete-backward-char", Fdelete_backward_char, 1, 2, "*p\nP", /*
+Delete the previous N characters (following, with negative N).
+Optional second arg KILLFLAG non-nil means kill instead (save in kill ring).
+Interactively, N is the prefix arg, and KILLFLAG is set if
+N was explicitly specified.
+*/
+       (n, killflag))
+{
+  /* This function can GC */
+  CHECK_INT (n);
+  return Fdelete_char (make_int (- XINT (n)), killflag);
+}
+
+static void internal_self_insert (Emchar ch, int noautofill);
+
+DEFUN ("self-insert-command", Fself_insert_command, 1, 1, "*p", /*
+Insert the character you type.
+Whichever character you type to run this command is inserted.
+*/
+       (n))
+{
+  /* This function can GC */
+  Emchar ch;
+  Lisp_Object c;
+  int count;
+
+  CHECK_NATNUM (n);
+  count = XINT (n);
+
+  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);
+
+  ch = XCHAR (c);
+
+  while (count--)
+    internal_self_insert (ch, (count != 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;
+  struct Lisp_Char_Table *syntax_table;
+  struct buffer *buf = current_buffer;
+  int tab_width;
+
+  overwrite = buf->overwrite_mode;
+  syntax_table = XCHAR_TABLE (buf->mirror_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'
+	  || ((tab_width = XINT (buf->tab_width), tab_width <= 0)
+	  || tab_width > 20
+	  || !((current_column (buf) + 1) % 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))
+	{
+#if 1
+	  Fexpand_abbrev ();
+#else  /* FSFmacs */
+	  Lisp_Object sym = Fexpand_abbrev ();
+
+	  /* I think this is too bogus to add.  The function should
+             have a way of examining the character to be inserted, so
+             it can decide whether to insert it or not.  We should
+             design it better than that.  */
+
+	  /* Here FSFmacs remembers MODIFF, compares it after
+             Fexpand_abbrev() finishes, and updates HAIRY.  */
+
+	  /* NOTE: we cannot simply check for Vlast_abbrev, because
+	     Fexpand_abbrev() can bail out before setting it to
+	     anything meaningful, leaving us stuck with an old value.
+	     Thus Fexpand_abbrev() was extended to return the actual
+	     abbrev symbol.  */
+	  if (!NILP (sym)
+	      && !NILP (symbol_function (XSYMBOL (sym)))
+	      && SYMBOLP (symbol_function (XSYMBOL (sym))))
+	    {
+	      Lisp_Object prop = Fget (symbol_function (XSYMBOL (sym)),
+				       Qno_self_insert, Qnil);
+	      if (!NILP (prop))
+		return;
+	    }
+#endif /* FSFmacs */
+        }
+    }
+  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 = make_int (BUF_PT (buf) - 1);
+      Lisp_Object after  = make_int (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, 1, 1, 0, /*
+Invoke `self-insert-command' as if CH is entered from keyboard.
+*/
+       (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");
+  defsymbol (&Qno_self_insert, "no-self-insert");
+
+  DEFSUBR (Fforward_char);
+  DEFSUBR (Fbackward_char);
+  DEFSUBR (Fforward_line);
+  DEFSUBR (Fbeginning_of_line);
+  DEFSUBR (Fend_of_line);
+
+  DEFSUBR (Fpoint_at_bol);
+  DEFSUBR (Fpoint_at_eol);
+
+  DEFSUBR (Fdelete_char);
+  DEFSUBR (Fdelete_backward_char);
+
+  DEFSUBR (Fself_insert_command);
+  DEFSUBR (Fself_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;
+}