I've just committed code that allows R to be built with support for
dynamic help pages using \Sexpr in Rd files. Define USE_NEW_HELP and
the R function tools:::.convertRdfiles will be used instead of the Perl
RdConv script, supporting \Sexpr and using the new R converters.
Currently only text help has the macros evaluated when the user asks for
help; the others are rendered at install time. Hopefully HTML rendering
will also be in place before the 2.10.x release. I can't see how CHM
and Latex help pages would ever be dynamic. Build time evaluation of
\Sexpr macros is not yet supported.
The only man page currently containing \Sexpr is ?tools::Rd2HTML.
Duncan Murdoch
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