-*-text-*- Problems, fixmes and other issues in the emacs-unicode branch ------------------------------------------------------------- Notes by fx to record various things of variable importance. handa needs to check them -- don't take too seriously, especially with regard to completeness. _Do take seriously that you don't want this branch unless you're actually working on it; you risk your data by actually using it._ If you just want to edit Unicode and/or unify iso-8859 et al, see the existing support and the extra stuff at , mostly now in the CVS trunk. (Editing support is mostly orthogonal to the internal representation.) * SINGLE_BYTE_CHAR_P returns true for Latin-1 characters, which has undesirable effects. * Rationalize character syntax and its relationship to the Unicode database. Specifically, the latin-N.el files aren't consistent for common characters (and obviously have redundancies except in unibyte mode). * Fontset handling and customization needs work. We want to relate fonts to scripts, probably based on the Unicode blocks. The presence of small-repertoire 10646-encoded fonts in XFree 4 is a pain, not currently worked round. With the change on 2002-07-26, multiple fonts can be specified in a fontset for a specific range of characters. Each range can also be specified by script. Before using ISO10646 fonts, Emacs checks their repertories to avoid such fonts that don't have a glyph for a specific character. * Work is also needed on charset and coding system priorities. * The relevant bits of latin1-disp.el need porting (and probably re-naming/updating). See also cyril-util.el. * Quail files need more work now the encoding is irrelevant. * What to do with the old coding categories stuff? * Syntax for symbols &c in characters.el needs looking at. * The preferred-coding-system property of charsets should probably be junked unless it can be made more useful now. * find-coding-systems-for-charsets needs re-writing or removing. * find-multibyte-characters needs looking at. * Implement Korean cp949/UHC and any other important missing charsets. * Check up on definitions of tcvn and alternativnj. * Lazy-load tables for unify-charset somehow? Actually, Emacs clear out all charset maps and unify-map just before dumping, and their are loaded again on demand the dumped emacs. But, those maps (char tables) generated while temacs is running can't be get rid of from the dumped emacs. * Translation tables for {en,de}code currently aren't supported. * Defining CCL coding systems currently doesn't work. * iso-2022 charsets get unified on i/o. * Revisit locale processing: look at treating the language and charset parts separately. (Language should affect things like speling and calendar, but that's not a Unicode issue.) * Handle Unicode combining characters usefully, e.g. diacritics, and handle more scripts specifically (à la Devanagari). There are issues with canonicalization. * Bidi is a separate issue with no support currently. * DTRT with X keysyms. We should get the right unicode for a given keysym, not decode raw bytes in some ill-defined coding system. (fx has some data on keysyms v. unicodes.) * We need tabular input methods, e.g. for maths symbols. (Not specific to Unicode.) * Need multibyte text in menus, e.g. for the above. (Not specific to Unicode.) * Still can't have case pairs which have different byte lengths -- can that be fixed for Turkish, at least? * There's currently no support for Unicode normalization. * Populate char-width-table correctly for Unicode chanaracters and worry about what happens when double-width charsets covering non-CJK characters are unified. * Emacs 20/21 .elc files are currently not loadable. It may or may not be possible to do this properly. With the change on 2002-07-24, elc files generated by Emacs 20.3 and later are correctly loaded (including those containing multibyte characters and compressed). But, elc files generated by 20.2 and the primer are still not loadable. Is it really worth working on it? * Encoding issues in babyl files/rmail need sorting out. * Gnus still needs some attention, and we need to get changes accepted by Gnus maintainers... * You can grep the code for lots of fixmes.