Alter build scripts to download-if-needed-only

[eddelbuettel]

Currently the header and library tarballs are download on each build and invocation of configure. This could be smarter -- and only download when not present. That would help for repeated builds from the source directory, ie R CMD build ..

[armstrtw]

that would be nice. I supposed we are impacted most by repeated builds as we develop.

[eddelbuettel]

And it shouldn't be much more than test -f some/file && exit.

It hit when I was noodling through this 'false alert' thingie I found more or less by chance...

[armstrtw]

So, should we work out a rough roadmap for our next release.

I'd really like to add support for live data subscriptions. which shouldn't bee too hard.

[eddelbuettel]

That discussion should probably be under another ticket number then ...

I also saw, belatedly, that r-sig-finance had a post with code snippets for the issue raised in two issue tickets about beds (or whatever it is called).

In short, we probably need a punch list...

[eddelbuettel]

Crap. Looking into this now but we have 'round hole / square peg' issue:

• I can cache the Blp tarballs in the source tree
• But by agreement with Vienna the .Rbuildignore will ignore them
• So the 'build and check' cycle via R CMD build ... and R CMD check ... will NOT see them.

So where could we cache them instead? Just /tmp or a subdir of it?

[eddelbuettel]

So R CMD INSTALL . from the working directory works. Good enough.