CPT: Use regex to get NSIS binaries on Windows

[onyb]

No description provided.

[onyb]

@vgvassilev Please do not merge this now. I am fixing the Appveyor builds, and will rebase to squash the unwanted commits.

[vgvassilev]

@onyb: ok, could you rebase. I made some progress with it.

[vgvassilev]

PR #103 is integrated. Could you rebase this on the master?

[vgvassilev]

@reikdas, could we resurrect this one, I think this code is relevant for packaging quite a lot.

[reikdas]

Sure.
Followup question - Do we want to use nsis instead of tar in appveyor?

[vgvassilev]

When we create a package yes. Nsis will create an installable file with the standard click-through approach which some windows users find more native.

[reikdas]

Do we always want NSIS version 3.0? The page the version number is currently being extracted from(https://github.com/vgvassilev/cling/blob/master/tools/packaging/cpt.py#L1210) extracts version 3.0 but the latest NSIS version is version 3.04 (https://sourceforge.net/p/nsis/news/).

If not, we should probably extract the version number from this - https://sourceforge.net/projects/nsis/best_release.json (more details here - https://sourceforge.net/p/forge/documentation/Using%20the%20Release%20API/#the-response).

[vgvassilev]

Is there something we want to use which is not in version 3.0?

I don’t mind using any version you prefer, as long as it does the right thing.