mandoc: After years of deliberation, finally provide a clear

[schwarze@mandoc.bsd.lv]

Log Message:
-----------
After years of deliberation, finally provide a clear recommendation
for hyphens and minus signs in manual pages.  
Since there is consensus that a typographically perfect solution is
impossible, let's KISS - just write "-", don't bother with "\-", all 
currently relevant manual page formatters can handle "-" reasonably.  
OK jmc@ bentley@

Modified Files:
--------------
    mandoc:
        mandoc_char.7

Revision Data
-------------
Index: mandoc_char.7
===================================================================
RCS file: /home/cvs/mandoc/mandoc/mandoc_char.7,v
retrieving revision 1.68
retrieving revision 1.69
diff -Lmandoc_char.7 -Lmandoc_char.7 -u -p -r1.68 -r1.69
--- mandoc_char.7
+++ mandoc_char.7
@@ -63,9 +63,9 @@ names; instead, provide ASCII transcript
 .Ss Dashes and Hyphens
 In typography there are different types of dashes of various width:
 the hyphen (-),
-the minus sign (\(mi),
 the en-dash (\(en),
-and the em-dash (\(em).
+the em-dash (\(em),
+and the mathematical minus sign (\(mi).
 .Pp
 Hyphens are used for adjectives;
 to separate the two parts of a compound word;
@@ -100,14 +100,6 @@ Such automatic hyphenation is not suppor
 which only breaks the line at whitespace, and inside words only
 after existing hyphens.
 .Pp
-The mathematical minus sign is used for negative numbers or subtraction.
-It should be written as
-.Sq \e(mi :
-.Bd -unfilled -offset indent
-a = 3 \e(mi 1;
-b = \e(mi2;
-.Ed
-.Pp
 The en-dash is used to separate the two elements of a range,
 or can be used the same way as an em-dash.
 It should be written as
@@ -126,10 +118,23 @@ Three things \e(em apples, oranges, and 
 This is not that \e(em rather, this is that.
 .Ed
 .Pp
-Note:
-hyphens, minus signs, and en-dashes look identical under normal ASCII output.
-Other formats, such as PostScript, render them correctly,
-with differing widths.
+In
+.Xr roff 7
+documents, the minus sign is normally written as
+.Sq \e- .
+In manual pages, some style guides recommend to also use
+.Sq \e-
+if an ASCII 0x2d
+.Dq hyphen-minus
+output glyph that can be copied and pasted is desired in output modes
+supporting it, for example in
+.Fl T Cm utf8
+and
+.Fl T Cm html .
+But currently, no practically relevant manual page formatter actually
+requires that subtlety, so in manual pages just write plain
+.Sq -
+to represent hyphen, minus, and hyphen-minus.
 .Ss Spaces
 To separate words in normal text, for indenting and alignment
 in literal context, and when none of the following special cases apply,
--
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