. Markup common to the main Exim doc and the Exim filters doc

. --- Override the &$ flag to automatically insert a $ with the variable name.

.flag &$  $&   "<varname>$"  "</varname>"


. --- A standard way of referencing RFCs
. --- Takes one arg with just the number. Inline call: &rfc(2821)
. --- and optionally a second one for a tag to be appended to the URL:
. --- &rfc(7671,section-2.1)
.macro rfc
.arg 2
&url(https://datatracker.ietf.org/doc/html/rfc$1#$2,"RFC $1")
.endarg
.arg -2
&url(https://datatracker.ietf.org/doc/html/rfc$1,"RFC $1")
.endarg
.endmacro

