3 Problems, fixmes and other issues in the emacs-unicode branch
4 -------------------------------------------------------------
6 Notes by fx to record various things of variable importance. handa
7 needs to check them -- don't take too seriously, especially with
8 regard to completeness.
10 _Do take seriously that you don't want this branch unless you're
11 actually working on it; you risk your data by actually using it._ If
12 you just want to edit Unicode and/or unify iso-8859 et al, see the
13 existing support and the extra stuff at
14 <URL:ftp://dlpx1.dl.ac.uk/fx/emacs/Mule>, mostly now in the CVS trunk.
15 (Editing support is mostly orthogonal to the internal representation.)
17 * SINGLE_BYTE_CHAR_P returns true for Latin-1 characters, which has
20 * Rationalize character syntax and its relationship to the Unicode
21 database. Specifically, the latin-N.el files aren't consistent for
22 common characters (and obviously have redundancies except in
25 * Fontset handling and customization needs work. We want to relate
26 fonts to scripts, probably based on the Unicode blocks. The
27 presence of small-repertoire 10646-encoded fonts in XFree 4 is a
28 pain, not currently worked round.
30 With the change on 2002-07-26, multiple fonts can be
31 specified in a fontset for a specific range of characters.
32 Each range can also be specified by script. Before using
33 ISO10646 fonts, Emacs checks their repertories to avoid such
34 fonts that don't have a glyph for a specific character.
36 * Work is also needed on charset and coding system priorities.
38 * The relevant bits of latin1-disp.el need porting (and probably
39 re-naming/updating). See also cyril-util.el.
41 * Quail files need more work now the encoding is irrelevant.
43 * What to do with the old coding categories stuff?
45 * Syntax for symbols &c in characters.el needs looking at.
47 * The preferred-coding-system property of charsets should probably be
48 junked unless it can be made more useful now.
50 * find-coding-systems-for-charsets needs re-writing or removing.
52 * find-multibyte-characters needs looking at.
54 * Implement Korean cp949/UHC and any other important missing
57 * Check up on definitions of tcvn and alternativnj.
59 * Lazy-load tables for unify-charset somehow?
61 Actually, Emacs clear out all charset maps and unify-map just
62 before dumping, and their are loaded again on demand the
63 dumped emacs. But, those maps (char tables) generated while
64 temacs is running can't be get rid of from the dumped emacs.
66 * Translation tables for {en,de}code currently aren't supported.
68 * Defining CCL coding systems currently doesn't work.
70 * iso-2022 charsets get unified on i/o.
72 * Revisit locale processing: look at treating the language and
73 charset parts separately. (Language should affect things like
74 speling and calendar, but that's not a Unicode issue.)
76 * Handle Unicode combining characters usefully, e.g. diacritics, and
77 handle more scripts specifically (à la Devanagari). There are
78 issues with canonicalization.
80 * Bidi is a separate issue with no support currently.
82 * DTRT with X keysyms. We should get the right unicode for a given
83 keysym, not decode raw bytes in some ill-defined coding system.
84 (fx has some data on keysyms v. unicodes.)
86 * We need tabular input methods, e.g. for maths symbols. (Not
89 * Need multibyte text in menus, e.g. for the above. (Not specific to
92 * Still can't have case pairs which have different byte lengths --
93 can that be fixed for Turkish, at least?
95 * There's currently no support for Unicode normalization.
97 * Populate char-width-table correctly for Unicode chanaracters and
98 worry about what happens when double-width charsets covering
99 non-CJK characters are unified.
101 * Emacs 20/21 .elc files are currently not loadable. It may or may
102 not be possible to do this properly.
104 With the change on 2002-07-24, elc files generated by Emacs
105 20.3 and later are correctly loaded (including those
106 containing multibyte characters and compressed). But, elc
107 files generated by 20.2 and the primer are still not loadable.
108 Is it really worth working on it?
110 * Encoding issues in babyl files/rmail need sorting out.
112 * Gnus still needs some attention, and we need to get changes
113 accepted by Gnus maintainers...
115 * You can grep the code for lots of fixmes.