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[groff] hyphen, minus sign and hyphen-minus
From: |
Pali Rohár |
Subject: |
[groff] hyphen, minus sign and hyphen-minus |
Date: |
Fri, 25 May 2018 09:54:59 +0200 |
User-agent: |
NeoMutt/20170113 (1.7.2) |
Hi!
I would like to ask, how to print hyphen-minus character in groff?
I mean classic ASCII "-" which has Unicode code point U+002D.
In groff_char(7) documentation is written:
- the ISO latin1 ‘Hyphen, Minus Sign’ (code 45) prints as a hyphen
(Unicode u2010). The same output glyph can be requested explicitly
with ‘\(hy’. A minus sign can be obtained with ‘\-’ (Unicode u2212).
And then groff_char(7) contains table:
Output Input Code PostScript Unicode Notes
‐ - 45 hyphen u2010 hyphen
- \- minus u2212 minus sign
Output Input PostScript Unicode Notes
— \[em] emdash u2014 em-dash symbol +
– \[en] endash u2013 en-dash symbol
‐ \[hy] hyphen u2010 hyphen symbol +
So ASCII "-" prints U+2010 hyphen character and \- prints U+2212
mathematical minus character.
For typographic purposes it is really nice to have ability to
distinguish between hyphen, mathematical minus and en-dash.
But in some cases I need to print hyphen-minus 0x2D character. And there
is absolutely no information in groff_char(7) documentation. So what is
the correct way to do it? As the quick hack I think that \N'45' is
working, but it is no so nice. I tried also \[char45], but it lead to
U+2010.
The main case when it is needed to print ASCII "-" and not Unicode
U+2010 is in source code examples. And also in manpages for switches.
E.g. --local-file in manpage should contain two hyphen-minuses (0x2D)
and not hyphens (U+2010) or mathematical minus signs (U+2212).
I see that in lot of manpages is used \-\-local\-file which leads to
minus signs on (html) output and then trying to call program with two
minus signs obviously ends with incorrect argument error. So it is for
sure wrong. For same reason is writing --local-file in manpage wrong
too.
--
Pali Rohár
address@hidden
- [groff] hyphen, minus sign and hyphen-minus,
Pali Rohár <=
- Re: [groff] hyphen, minus sign and hyphen-minus, Ingo Schwarze, 2018/05/25
- Re: [groff] hyphen, minus sign and hyphen-minus, Pali Rohár, 2018/05/25
- Re: [groff] hyphen, minus sign and hyphen-minus, Deri James, 2018/05/25
- Re: [groff] hyphen, minus sign and hyphen-minus, Ralph Corderoy, 2018/05/26
- Re: [groff] hyphen, minus sign and hyphen-minus, Pali Rohár, 2018/05/26
- Re: [groff] hyphen, minus sign and hyphen-minus, Deri James, 2018/05/26
- Re: [groff] hyphen, minus sign and hyphen-minus, Pali Rohár, 2018/05/26
- Re: [groff] hyphen, minus sign and hyphen-minus, Deri James, 2018/05/28
- Re: [groff] hyphen, minus sign and hyphen-minus, Ralph Corderoy, 2018/05/29
- Re: [groff] hyphen, minus sign and hyphen-minus, Ingo Schwarze, 2018/05/27