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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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Wait, why does std fastRuneAt try to decode UCS-32?
Hmm...
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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Instead of using the built-in (and outdated, and buggy) tables, we now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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* put attrs pointer in state
* simplify width()
* use unsigned int as ptint to avoid UB
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* Add functions for moving to the beginning/end of words (vi `b', `e').
* As it turns out, there are many possible interpretations of what a
word is. Now we have a function for each reasonable interpretation,
and the default settings match those of vi (and w3m in w3m.toml).
(Exception: it's still broken on line boundaries... TODO)
* Remove `bounds` from lineedit, it was horrible API design and mostly
useless. In the future, an API similar to what pager now has could
be added.
* Update docs, and fix some spacing issues with symbols in the tables.
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Also for reducing compilation time.
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* actually search Combining for isCombining
* fix searchInMap
* fix cmpRange of url
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so we do not have to import unicode
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Avoid computing e.g. charwidth data for http which does not need it
at all.
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