Hi Alex,
At 2021-01-22T11:50:02+0100, Alejandro Colomar (man-pages) wrote:
> On 1/22/21 11:07 AM, G. Branden Robinson wrote:
> > I don't think I've ever seen URLs bracketed «like this».
> >
> > On the other hand, because \[Fo] and \[Fc] are in the ISO 8859
> > character sets, aren't they much more likely to be supported by the
> > Linux console driver?
>
> For that same reason we could conclude that <> (less than, greater
> than) have even better support :)
>
> I'd use either u2039/A, or plain <>.
The less and greater than signs are already used to bracket URLs using
the .UR and .UE requests on non-UTF-8 devices and non-groff formatters.
If funny characters (or the Unicode replacement character) are rendering
around the URLs in your terminal window, then there are a few
possibilities.
1. Something is misconfigured; try a stock groff installation in an
xterm.
2. The font you're using in your terminal emulator lacks adequate glyph
coverage; a look at groff_char(7) may help determine this.
3. Your terminal emulator inadequately supports some aspect of UTF-8.
/usr/share/groff/1.22.4/tmac/an-ext.tmac:
43 .\" groff has glyph entities for angle brackets.
44 .ie \n(.g \{\
45 . ds la \(la\"
46 . ds ra \(ra\"
47 .\}
48 .el \{\
49 . ds la <\"
50 . ds ra >\"
51 . \" groff's man macros control hyphenation with this register.
52 . nr HY 1
53 .\}
The above chunk of the groff man(7) extension macros has not been
changed in 14 years, and no changes to the above string definitions are
planned. (Nor do I anticipate changes to the value of the HY register,
since it's present for non-groff formatters, but it's a completely
separate issue.)
$ grep -B 1 -Ew '(la|ra)' /usr/share/groff/1.22.4/font/dev{ascii,latin1}/*
/usr/share/groff/1.22.4/font/devascii/B-< 24 0 0074
/usr/share/groff/1.22.4/font/devascii/B:la "
--
/usr/share/groff/1.22.4/font/devascii/B-> 24 0 0076
/usr/share/groff/1.22.4/font/devascii/B:ra "
--
/usr/share/groff/1.22.4/font/devascii/BI-< 24 0 0074
/usr/share/groff/1.22.4/font/devascii/BI:la "
--
/usr/share/groff/1.22.4/font/devascii/BI-> 24 0 0076
/usr/share/groff/1.22.4/font/devascii/BI:ra "
--
/usr/share/groff/1.22.4/font/devascii/I-< 24 0 0074
/usr/share/groff/1.22.4/font/devascii/I:la "
--
/usr/share/groff/1.22.4/font/devascii/I-> 24 0 0076
/usr/share/groff/1.22.4/font/devascii/I:ra "
--
/usr/share/groff/1.22.4/font/devascii/R-< 24 0 0074
/usr/share/groff/1.22.4/font/devascii/R:la "
--
/usr/share/groff/1.22.4/font/devascii/R-> 24 0 0076
/usr/share/groff/1.22.4/font/devascii/R:ra "
--
/usr/share/groff/1.22.4/font/devlatin1/B-< 24 0 0074
/usr/share/groff/1.22.4/font/devlatin1/B:la "
--
[...and so on...]
The \(la and \(ra special character escapes map to < and > respectively
for non-UTF-8 terminal devices in groff.
So, as it happens, do \(fo and \(fc.
Here's a simple reproducer you can feed to "nroff -man" or "groff -Tutf8
-man".
.TH foo 1
.UR bar
.UE
Regards,
Branden
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