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There's probably more to do, but it seems usable at this point.
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To look up docs on my netbook and server. Practically deroff.1, with
heuristic for where to put spaces and newlines. How would you simplify
file resolution and bzcat? What have I got wrong when escaping slashes,
because while \-\^\- is -- ok, \-\- becomes -\-, e.g. in git-pull.1?
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leaking memory), and mod env command to test it.
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web archives, link to another web archive as a backup.
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Commands that want something different can override this, but it seems like
a fairly minor optimization and write(1) exists if we want to micromanage...
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Although we can get away with ignoring termcap/terminfo on the output
side by restricting ourselves to generally-supported escape sequences,
the input side is trickier because we need to support the sequences sent
by common terminals. Luckily, this isn't is as bad as it sounds because
only Home/End commonly differ. But it does mean we need a slightly
different implementation to deal with the many-to-one mapping.
Since we can't use TAGGED_ARRAY for this (without inflicting pain on all
the callers) I've also switched to OR-ing in the modifier keys, so we
have (say) KEY_UP|KEY_SHIFT rather than a separate KEY_SUP. This also
generalizes better should we ever need to support multiple modifiers at
once.
To reduce the number of #defines, I've also switched from KEY_F1,
KEY_F2, and so on to KEY_FN+1, KEY_FN+2, and so on. This isn't obviously
necessary, and easily undone if we'd rather have move #defines in return
for slightly more natural naming.
To enable all this, I've inverted scan_key and scan_key_getsize so that
scan_key_getsize is now the underlying function, and we don't waste all
the top bits encoding width and height between scan_key and
scan_key_getsize.
Tested by pressing Home and End in hexedit in all of the terminals
available to me.
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next_printf() shouldn't return null unless it never found the start of an
escape sequence (it'll return a pointer to the null at the end of the string
otherwise), and the only time we point it at a % and it doesn't is when it's
%%. So handle that before calling. (Also, a single trailing % prints in
other implementations, and while I'm there update to use FLAG() macros,
add a couple comments, and only xflush() once per pattern.)
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When the specified format string has odd '%' in the end,
the next_printf function will return null. Checking
the result value before using it.
Signed-off-by: liwugang <liwugang@xiaomi.com>
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Reimplemented basic cursor movements and char delete.
In order to work more correctly with utf-8 data.
x,h,j,k,l seems to work now with test data such as
tests/files/utf8/test2.txt
hjkl now accept count parameter so 1000j will scroll file 1000 lines
relative move to bottom
word movements w,e,b... still need to be still reimplemented in order to
step correctly on utf-8 data
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and tweak a couple comments.
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Style cleanups:
Removing whitespaces at end of lines, hopefully reduces git am
warnings
Bug fixes:
fix segfault if file did not exist, now creates one empty line
fix insert mode text not showing on start of line
fix append on empty line
fix cursor move right on empty line
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A trivial test, but it would have caught the previous bug...
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Now calculates utf-8 rune width properly before trying to print on screen.
works with test1.txt and test2.txt on tests/files/utf8 folder with
0x0300-0x036F combining chars
Uses mbtowc and wcwidth to calculate width of rune. These both should be
implemented on c runtime that conforms POSIX-1.2001. Different c
runtimes might have different level of support to combining char
ranges etc...
I think there is no standard way to calculate utf-8 rune width without
converting it first to widechar. And i think conversion to widechar just
to calculate width is silly, since all write calls can be done with utf8
directly (on utf8 locales ofc), but in order to calculate them yourself
without pointless conversion, one would need to write variable byte lookup
array for binary searching weird ranges and make sure it works with big-endian
systems too...
By the way running ./watch ./cat tests/files/utf8/japan.txt does not print the
text for some reason, but other test data does... I was checking how
well original crunch_str works and noticed it.
-Jarno
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