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Also, kill twidth and its friends; we haven't been using it for a
while now. (In the future, a solution with PUA chars might be worth
exploring.)
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* align status truncating behavior with w3m (not exactly, clipping
is still different, but this should be fine for now)
* add "su" for "show last alert"
- w3m's solution here is to scroll one char at a time with
"u", but that's extremely annoying to use. We already have a
line editor that can navigate lines, so reuse that instead.
* fix peekCursor showing empty text
* update todo
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std/unicode has the following issues:
* Rune is an int32, which implies overflow checking. Also, it is
distinct, so you have to convert it manually to do arithmetic.
* QJS libunicode and Chagashi work with uint32, interfacing with these
required pointless type conversions.
* fastRuneAt is a template, meaning it's pasted into every call
site. Also, it decodes to UCS-4, so it generates two branches that
aren't even used. Overall this lead to quite some code bloat.
* fastRuneAt and lastRune have frustratingly different
interfaces. Writing code to handle both cases is error prone.
* On older Nim versions which we still support, std/unicode takes
strings, not openArray[char]'s.
Replace it with "twtuni", which includes some improved versions of
the few procedures from std/unicode that we actually use.
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* merge select into container
* avoid unnecessary redraws in draw() for parts of the screen that
haven't been updated
* various image redraw fixes
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Operation "modularize Chawan somewhat" part 3
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Use a LUContext to only load required CharRanges once per pager.
Also, add kana & hangul vi word break categories for convenience.
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Instead of using the built-in (and outdated, and buggy) tables, we now
use libunicode from QJS. This shaves some bytes off the executable,
though far less than I had imagined it would.
Also, a surprising effect of this change: because libunicode's tables
aren't glitched out, kanji properly gets classified as alpha. I found
this greatly annoying because `w' in Japanese text would now jump
through whole sentences. As a band-aid solution I added an extra
Han category, but I wish we had a more robust solution that could
differentiate between *all* scripts.
TODO: I suspect that separately loading the tables for every rune in
breaksViWordCat is rather inefficient. Using some context object (at
least per operation) would probably be beneficial.
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* separate params with ; (semicolon) instead of , (colon)
* reduce screaming snake case use
* wrap long lines
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* embed prompt string into enums
* move pager.username to LineDataAuth
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* extern -> gone, runproc absorbed by pager, others moved into io/
* display -> local/ (where else would we display?)
* xhr -> html/
* move out WindowAttributes from term, so we don't depend on local
from server
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