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From: "Anthony J. Bentley" <anthony@anjbe.name>
To: Ingo Schwarze <schwarze@usta.de>
Cc: tech@mandoc.bsd.lv
Subject: Re: table borders don't span entire width
Date: Fri, 08 Feb 2019 16:18:37 -0700	[thread overview]
Message-ID: <48691.1549667917@desktop.ajb.soy> (raw)
In-Reply-To: <20190208223911.GH20044@athene.usta.de>

Hi Ingo,

The missing characters ring a bell. I'm pretty sure I investigated this
before, came to the same conclusion (that needed box drawing characters
don't exist), and then must have forgotten all about it.

Ingo Schwarze writes:
> So in particular, the following are missing:
>
>  * double right
>  * double down
>  * single left with double right
>  * single left down with double right
>  * single left with double right down
>  * double left
>  * double left with single right
>  * double left with single right down
>  * double left down with single right
>
> and so on...
>
> With heavy instead of double, such combinations exist.

That's a real shame. I looked in the Unicode standard but couldn't find
any rationale, only a comment that the box drawing section of Unicode
exists for compatibility with historic systems. I guess there wasn't
anything out there that used double boxes in this way.

https://www.unicode.org/versions/Unicode11.0.0/ch22.pdf

> So, should i leave this untouched, or am i missing something?

Leave it as is, I guess. But we should document this limitation in
tbl(7) since it's non-obvious and seems to have come up multiple times.

Or just draw twice as many lines, like groff attempts poorly with
doublebox...

-- 
Anthony J. Bentley
--
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  reply	other threads:[~2019-02-08 23:18 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-02-08 21:43 Anthony J. Bentley
2019-02-08 22:02 ` Ingo Schwarze
2019-02-08 22:39   ` Ingo Schwarze
2019-02-08 23:18     ` Anthony J. Bentley [this message]
2019-02-09 16:55       ` Ingo Schwarze
2019-02-09 21:06   ` Ingo Schwarze

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