[Rd] feature request for non-sweave vignettes

[Patrick Brown]

Currently Makefiles for vignettes are only supported for .tex files.  Could
the tools package be modified to allow file extensions to be specified for
a vignette engine?  Having the pandoc pdf conversion in a Makefile rather
than through R would be tidier in some cases.

If I specify my vignette engine as

```
tools::vignetteEngine(
  'myengine',
  pattern = '\\.[Rr](md|nw)$',
  output = c('md', 'tex'),
  ...
)
```

the `tools:::find_vignette_product` function could have

`if (final) c("pdf", "html") else unique(c("pdf", "html", "tex",
engine$output))`

that's probably the only line that would need changing.

p

Patrick Brown
Department of Statistical Sciences, University of Toronto
Analytics and Informatics, Cancer Care Ontario
pbrown.ca

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