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115 lines
3.8 KiB
Plaintext
115 lines
3.8 KiB
Plaintext
GNU Emacs NEWS -- history of user-visible changes.
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Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007
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Free Software Foundation, Inc.
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See the end of the file for license conditions.
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Please send Emacs bug reports to bug-gnu-emacs@gnu.org.
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If possible, use M-x report-emacs-bug.
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This file is about changes in the Emacs "unicode" branch.
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Fixme: The notes about Emacs 23 are quite incomplete.
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* Changes in Emacs 23.1
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** The Emacs character set is now a superset of Unicode.
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(It has about four times the code space, which should be plenty).
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The internal encoding used for buffers and strings is now
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Unicode-based and called `utf-8-emacs'. utf-8-emacs is backwards
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compatible with the UTF-8 encoding of Unicode. The `emacs-mule'
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coding system can still read and write data in the old internal
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encoding.
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There are still charsets which contain disjoint sets of characters
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where this is necessary or useful, especially for various Far Eastern
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sets which are problematic with Unicode.
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Since the internal encoding is also used by default for byte-compiled
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files -- i.e. the normal coding system for byte-compiled Lisp files is
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now utf-8-Emacs -- Lisp containing non-ASCII characters which is
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compiled by Emacs 23 can't be read by earlier versions of Emacs. Files
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compiled by Emacs 20, 21, or 22 are loaded correctly as emacs-mule
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(whether or not they contain multibyte characters), which makes loading
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them somewhat slower than Emacs 23-compiled files. Thus it may be worth
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recompiling existing .elc files which don't need to be shared with older
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Emacsen.
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** There are assorted new coding systems/aliases -- see
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M-x list-coding-systems.
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** New charset implementation with many new charsets.
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See M-x list-character-sets. New charsets can be defined conveniently
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as tables of unicodes.
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The dimension of a charset is now 0, 1, 2, or 3, and the size of each
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dimension is no longer limited to 94 or 96.
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Generic characters no longer exist.
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A dynamic charset priority list is used to infer the charset of
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unicodes for display &c.
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** The following facilities are obsolete:
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Minor modes: unify-8859-on-encoding-mode, unify-8859-on-decoding-mode
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* Lisp changes in Emacs 23.1
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map-char-table's behaviour has changed.
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New functions: characterp, max-char, map-charset-chars,
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define-charset-alias, primary-charset, set-primary-charset,
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unify-charset, clear-charset-maps, charset-priority-list,
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set-charset-priority, define-coding-system,
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define-coding-system-alias, coding-system-aliases, langinfo,
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string-to-multibyte.
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Changed functions: copy-sequence, decode-char, encode-char,
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set-fontset-font, new-fontset, modify-syntax-entry, define-charset,
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modify-category-entry
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Obsoleted: char-bytes, chars-in-region, set-coding-priority,
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char-valid-p
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* Incompatible Lisp changes
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Deleted functions: make-coding-system, register-char-codings,
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coding-system-spec
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** The character codes for characters from the
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eight-bit-control/eight-bit-graphic charsets aren't now in the range
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128-255.
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----------------------------------------------------------------------
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This file is part of GNU Emacs.
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GNU Emacs 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 2, or (at your option)
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any later version.
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GNU Emacs is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Emacs; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA.
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Local variables:
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mode: outline
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paragraph-separate: "[ ]*$"
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end:
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arch-tag: e21801b9-0724-4cda-8c07-7d60bf3db3fd
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