[Rd] Bug in tools::compactPDF() in 2.13-0-alpha

[Gavin Simpson]

Dear List,

There seems to be an bug in compactPDF() or at least an inconsistency
with the documented behaviour.

The documentations states:

Details:

     This by default makes use of ‘qpdf’, available from <URL:
     http://qpdf.sourceforge.net/>, including a Windows binary.  If
     ‘gs_cmd’ is non-empty, GhostScript is used.

I don't have qpdf on my system so planned to use ghostscript. However,
the code for compactPDF() has as it's first few lines:

    if (!nzchar(Sys.which(qpdf))) 
        return()

So because I don't have qpdf, compactPDF() always returns NULL:

> nzchar(Sys.which(Sys.getenv("R_QPDF", "qpdf")))
[1] FALSE

> compactPDF("../analogue/pkg/inst/doc/analogue_methods.pdf", gs_cmd = "/usr/bin/")
NULL

no matter what I do.

This is with:

> sessionInfo()
R version 2.13.0 alpha (2011-03-27 r55077)
Platform: x86_64-unknown-linux-gnu (64-bit)

locale:
 [1] LC_CTYPE=en_GB.utf8       LC_NUMERIC=C             
 [3] LC_TIME=en_GB.utf8        LC_COLLATE=en_GB.utf8    
 [5] LC_MONETARY=C             LC_MESSAGES=en_GB.utf8   
 [7] LC_PAPER=en_GB.utf8       LC_NAME=C                
 [9] LC_ADDRESS=C              LC_TELEPHONE=C           
[11] LC_MEASUREMENT=en_GB.utf8 LC_IDENTIFICATION=C      

attached base packages:
[1] tools     stats     graphics  grDevices utils     datasets 
[7] methods   base 

Thanks,

Gavin
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