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Diffstat (limited to 'etc/NEWS')
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@@ -20,6 +20,81 @@ Temporary note: When you add a new item, please add it without either +++ or --- so we will look at it and add it to the manual. +Fixme: The notes about Emacs 23 are quite incomplete. + + +* Changes in Emacs 23.1 + +** The Emacs character set is now a superset of Unicode. +(It has about four times the code space, which should be plenty). + +The internal encoding used for buffers and strings is now +Unicode-based and called `utf-8-emacs'. utf-8-emacs is backwards +compatible with the UTF-8 encoding of Unicode. The `emacs-mule' +coding system can still read and write data in the old internal +encoding. + +There are still charsets which contain disjoint sets of characters +where this is necessary or useful, especially for various Far Eastern +sets which are problematic with Unicode. + +Since the internal encoding is also used by default for byte-compiled +files -- i.e. the normal coding system for byte-compiled Lisp files is +now utf-8-Emacs -- Lisp containing non-ASCII characters which is +compiled by Emacs 23 can't be read by earlier versions of Emacs. Files +compiled by Emacs 20, 21, or 22 are loaded correctly as emacs-mule +(whether or not they contain multibyte characters), which makes loading +them somewhat slower than Emacs 23-compiled files. Thus it may be worth +recompiling existing .elc files which don't need to be shared with older +Emacsen. + +** There are assorted new coding systems/aliases -- see +M-x list-coding-systems. + +** New charset implementation with many new charsets. +See M-x list-character-sets. New charsets can be defined conveniently +as tables of unicodes. + +The dimension of a charset is now 0, 1, 2, or 3, and the size of each +dimension is no longer limited to 94 or 96. + +Generic characters no longer exist. + +A dynamic charset priority list is used to infer the charset of +unicodes for display &c. + +** The following facilities are obsolete: + +Minor modes: unify-8859-on-encoding-mode, unify-8859-on-decoding-mode + + +* Lisp changes in Emacs 23.1 + +map-char-table's behaviour has changed. + +New functions: characterp, max-char, map-charset-chars, +define-charset-alias, primary-charset, set-primary-charset, +unify-charset, clear-charset-maps, charset-priority-list, +set-charset-priority, define-coding-system, +define-coding-system-alias, coding-system-aliases, langinfo, +string-to-multibyte. + +Changed functions: copy-sequence, decode-char, encode-char, +set-fontset-font, new-fontset, modify-syntax-entry, define-charset, +modify-category-entry + +Obsoleted: char-bytes, chars-in-region, set-coding-priority, +char-valid-p + + +* Incompatible Lisp changes + +Deleted functions: make-coding-system, register-char-codings, +coding-system-spec + +** The character codes for characters from the +eight-bit-control/eight-bit-graphic charsets aren't now in the range +128-255. * Installation Changes in Emacs 22.1 |