Yes, stack has plans for automatic stack.yaml maintenance:

https://github.com/commercialhaskell/stack/issues/115

It's been purposely back-burnered as we focus on more central features first, but it's actually a pretty good issue for a newcomer to embark on since it doesn't interact with the rest of the system too much.

I'm not exactly sure though what you mean by "fetch" here. To clarify: stack will automatically download the source for the dependency when building.

On Mon, Sep 7, 2015 at 11:02 AM, xu xiut <xiut.xu@gmail.com> wrote:

With node.js, you can run `npm install --save package@1.01`, and that version of the package will be retrieved and added to your list of dependencies. If you leave off the version number, it will retrieve the latest version from a default repository of packages.

Are there any plans to add something this to either cabal or stack?

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