.TH groff_rfc1345 7 "13 September 2023" "groff 1.23.0"
.SH Name
groff_rfc1345 \- special character names from RFC 1345 and Vim digraphs
.
.
.\" ====================================================================
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.
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.\" ====================================================================
.SH Description
.\" ====================================================================
.
The file
.I rfc1345.tmac
defines special character escape sequences for
.MR groff 7
based on the glyph mnemonics specified in RFC 1345 and the digraph table
of the text editor Vim.
.
Each escape sequence translates to a Unicode code point,
and will render correctly if the underlying font is a Unicode font that
covers the code point.
.
.
.PP
For example,
.RB \[lq] \[rs][Rx] \[rq]
is the \[lq]recipe\[rq] or \[lq]prescription take\[rq] symbol,
and maps to the code point U+211E.
.
.I groff
lets you write it as
.RB \[lq] \[rs][u211E] \[rq],
but
.RB \[lq] \[rs][Rx] \[rq]
is more mnemonic.
.
.
.PP
For a list of the glyph names provided,
please see the file
.IR rfc1345.tmac ,
which contains definitions of the form
.
.RS
.EX
\&.char \[rs][Rx] \[rs][u211E]    \[rs]" PRESCRIPTION TAKE
.EE
.RE
.
where
.BR .char 's
first argument defines a
.I groff
special character escape sequence with a mnemonic glyph name,
its second argument is a special character escape sequence based on the
code point,
and the comment describes the glyph defined.
.
.
.PP
The RFC 1345 glyph names cover a wide range of Unicode code points,
including
supplemental Latin,
Greek,
Cyrillic,
Hebrew,
Arabic,
Hiragana,
Katakana,
and Bopomofo letters,
punctuation,
math notation,
currency
symbols,
industrial and entertainment icons,
and box-drawing symbols.
.
.
.PP
The Vim digraph table is practically a subset of RFC 1345
(being limited to two-character mnemonics),
but,
as a newer implementation,
adds four mnemonics not specified in the RFC
(the horizontal ellipsis,
the Euro sign,
and two mappings for the rouble sign).
.
These have also been added to
.IR rfc1345.tmac .
.
.
.PP
.I rfc1345.tmac
contains a total of 1,696 glyph names.
.
It is not an
error to load
.I rfc1345.tmac
if your font does not have all the glyphs,
as long as it contains the glyphs that you actually use in your
document.
.
.
.PP
The RFC 1345 mnemonics are not identical in every case to the mappings
for special character glyph names that are built in to
.IR groff ;
for example,
.RB \[lq] \[rs][<<] \[rq]
means the \[lq]much less than\[rq] sign (U+226A) when
.I rfc1345.tmac
is not loaded and this special character is not otherwise defined by a
document or macro package.
.
.I rfc1345.tmac
redefines
.RB \[lq] \[rs][<<] \[rq]
to the \[lq]left-pointing double angle quotation mark\[rq] (U+00AB).
.
See
.MR groff_char 7
for the full list of predefined special character escape sequences.
.
.
.\" ====================================================================
.SS Usage
.\" ====================================================================
.
Load the
.I rfc1345.tmac
file.
.
This can be done by either adding
.RB \[lq] ".mso rfc1345.tmac" \[rq]
to your document before the first use of any of the glyph names the
macro file defines,
or by using the
.MR \%troff 1
option
.RB \[lq] "\-m rfc1345" \[rq]
from the shell.
.
.
.\" ====================================================================
.SS Bugs
.\" ====================================================================
.
As the
.I groff
Texinfo manual notes,
\[lq][o]nly the current font is checked for ligatures and kerns;
neither special fonts nor entities defined with the
.B char
request
(and its siblings)
are taken into account.\[rq]
.
Many of the characters defined in
.I rfc1345.tmac
are accented Latin letters,
and will be affected by this deficiency,
.UR https://\:savannah\:.gnu\:.org/\:bugs/\:?59932
producing subpar typography
.UE .
.
.
.\" ====================================================================
.SH Files
.\" ====================================================================
.
.TP
.I /usr/\:\%share/\:\%groff/\:\%1.23.0/\:\%tmac/\:rfc1345\:.tmac
implements the character mappings.
.
.
.\" ====================================================================
.SH Authors
.\" ====================================================================
.
.I rfc1345\:.tmac
was contributed by
.MT ds26gte@\:yahoo\:.com
Dorai Sitaram
.ME .
.
.
.\" ====================================================================
.SH "See also"
.\" ====================================================================
.
.UR https://\:tools\:.ietf\:.org/\:html/\:rfc1345
RFC 1345
.UE ,
by Keld Simonsen,
June 1992.
.
.
.PP
The Vim digraph table can be listed using the
.MR vim 1
command
.RB \[lq] ":help \%digraph\-table" \[rq].
.
.
.PP
.MR groff_char 7
.
.
.\" Restore compatibility mode (for, e.g., Solaris 10/11).
.cp \n[*groff_groff_rfc1345_7_man_C]
.do rr *groff_groff_rfc1345_7_man_C
.
.
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