Enable tab completion for bundled commands like dotnet-watch and dotnet-user-secrets

[natemcmaster]

Follow-up to dotnet/cli#8665 and dotnet/cli#8606

It would be nice to enable tab completion for the following commands that are available as bundled tools

• dotnet watch
• dotnet dev-certs
• dotnet sql-cache
• dotnet user-secrets

[livarcocc]

That's would be nice indeed. Tab completion that shells out to a dotnet-complete command implemented by the CLI, which then, I believe, invokes the parser suggestions.

If you adhere to the same APIs (I would suggest using the CLICommandLineParser) for that, it should just work.

cc @jonsequitur who implemented both the parser and completion to comment.

Jon, these are commands that are shipped in the CLI but are not implemented by the CLI. We would like to have completion for them. Did what I said above make sense?

[wli3]

I believe dotnet-complete requires command "registered" in the parser. Which dotnet watch is not. We could either add it to the parser (which i don't like, that will add more burden to insertion), or we could extend dotnet-complete outside parser. And add resolver's command into it.

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