Support for dependent packages in Mercurial

[DaveCTurner]

Hi,

The ability to refer to a dependency on a git commit is useful, and I'd quite like to add support for the same thing for Mercurial repositories.

Firstly, would that be useful?

Secondly, I think all I'd have to do would be to add a new constructor to Stack.Types.Config.PackageLocation, implement ToJSON and FromJSON, and add a new case to Stack.Config.resolvePackageLocation that would look very similar to the git one except would run hg clone and then hg update -C instead of git clone and git reset --hard respectively. I've not actually tried it so perhaps there's more, but it'd be useful to know I'm on the right lines.

Thirdly, the cases for PLHttpTarball and PLGit are already rather similar and I'd feel bad adding a third case just like them. Would it be ok to extract the common code into one place too?

Cheers,

David

[DaveCTurner]

Something like this, perhaps?

[borsboom]

Looks great, and thanks for the very easy to read PR. Can you just add an entry to the change log, and add "supported since 0.1.9.0" for the hg parts of yaml_configuration.md?

[DaveCTurner]

Ok, I've done that.

[borsboom]

Thanks; merged!