[vcpkg] add command init-registry

[autoantwort]

The next step is to support x-add-version in registries.

[autoantwort]

For x-add-version I see two possibilities:

1. Make x-add-version a BasicCommand and determine the ports and versions dir inside of perform_and_exit, but this is maybe a bad idea because you also want to check --x-builtin-ports-root and --x-builtin-registry-versions-dir and you maybe also want to change other commands so that they word in registries (vcpkg edit/create)
2. Add a new class VcpkgBasePaths that contains the .git, ports and the versions folder, but not the rest of VcpkgPaths and remove the paths of VcpkgBasePaths from VcpkgPaths. Add than a new command category BasePathsCommand.

I think the second solution is cleaner, but I don't want to implement something and have to change everything later. So which version do you prefer (or maybe you have another idea how to solve this)?

[autoantwort]

I have now finally implemented your suggestions.

[autoantwort]

For x-add-version I see two possibilities:

1. Make x-add-version a BasicCommand and determine the ports and versions dir inside of perform_and_exit, but this is maybe a bad idea because you also want to check --x-builtin-ports-root and --x-builtin-registry-versions-dir and you maybe also want to change other commands so that they word in registries (vcpkg edit/create)

2. Add a new class VcpkgBasePaths that contains the .git, ports and the versions folder, but not the rest of VcpkgPaths and remove the paths of VcpkgBasePaths from VcpkgPaths. Add than a new command category BasePathsCommand.

I think the second solution is cleaner, but I don't want to implement something and have to change everything later. So which version do you prefer (or maybe you have another idea how to solve this)?

Any opinion about this @strega-nil @ras0219-msft ?

[autoantwort]

@strega-nil-ms ping
It is finished now

[strega-nil-ms]

minor changes

you'll also need to take a VcpkgPaths&.

[strega-nil-ms]

Thanks so much @autoantwort :)

[Neumann-A]

So I used:
./vcpkg.exe x-init-registry ../my-vcpkg-ports/
and
./vcpkg.exe x-add-version --all --overlay-ports=../my-vcpkg-ports/ --x-builtin-registry-versions-dir=../my-vcpkg-ports/versions/ --x-builtin-ports-root=../my-vcpkg-ports/

What I observed:
Having the ports directory being generated by ./vcpkg.exe x-init-registry ../my-vcpkg-ports/ is unnecessary.