Construct a partial RemoteRepo value to fold the field parser list over.

no-index style local repositories.

https://github.com/haskell/cabal/issues/6359

Construct a partial LocalRepo value to fold the field parser list over.

Calculate a cache key for local-repo.

For remote repositories we just use name, but local repositories may all be named "local", so we add a bit of localRepoPath into the mix.

Different kinds of repositories

NOTE: It is important that this type remains serializable.

Check if this is a remote repo

Extract RemoteRepo from Repo if remote.

When on Windows, we need to convert the paths in URIs to be POSIX-style.

>>> import Network.URI
>>> normaliseFileNoIndexURI Windows (URI "file+noindex:" (Just nullURIAuth) "C:\\dev\\foo" "" "")
file+noindex:C:/dev/foo

Other formats of file paths are not understood by network-uri:

>>> import Network.URI
>>> uriPath <$> parseURI "file+noindex://C:/foo.txt"
Just "/foo.txt"
>>> parseURI "file+noindex://C:\foo.txt"
Nothing
>>> uriPath <$> parseURI "file+noindex:///C:/foo.txt"
Just "/C:/foo.txt"
>>> uriPath <$> parseURI "file+noindex:C:/foo.txt"
Just "C:/foo.txt"

Out of the ones above, only the last one can be used from anywhere in the system.