Helper to manage Remotes

[jennybc]

It would be nice to have a Remotes helper. Or maybe use_package() could help with this.

[hadley]

@gaborcsardi would you consider adding remotes helpers to desc?

[gaborcsardi]

Sure, makes sense, I was already thinking about it. How about

• get_remotes()
• set_remotes(remotes)
• add_remotes(remotes)
• del_remotes(pattern)
• clear_remotes()
  ?

This basically matches the other helpers in desc, e.g. for URL.

[hadley]

Yeah, I like it.

[gaborcsardi]

Actually, I am writing this now, and you would also need sg that updates a location, because it happens relatively often that you specify a (different) tag or hash for an existing remote. So I'll add

• update_remotes(remotes)

as well. This is more work, as I need to parse the location to see which one needs to be updated.

Or maybe add_remotes() should just handle this automatically, and update instead of just append.

Also, it makes sense to warn if a remote is added but the package is not in any of the dependency fields.

[gaborcsardi]

OK, I'll leave out the updating part for now, there is no proper API for it anywhere.....

[gaborcsardi]

There is an implementation in r-lib/desc@dc6d680

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