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I notice that Stack supports using a package.yaml file that it will use to generate a .cabal file. For example, yi-core/package.yaml. Its structure seems very similar to a Cabal file, but not quite the same. Some of the keys have been renamed (for example, Stack uses source-dirs instead of hs-source-dirs).
I haven't found any documentation on this feature. The Stack docs don't seem to mention package.yaml at all. Does a specification exist?
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yaml file, which specifies how to build a set of packages. We define package to be a package with a Cabal file or an Hpack package. yaml file. In your project-specific options, you specify both which local packages to build and which dependencies to use when building these packages.
stack. yaml contains project-level configuration for Stack, and may contain project-specific options and non-project-specific options. package. yaml contains a description of a package in the Hpack format. Hpack, including Stack's built-in version, uses the file to create a Cabal file.
Stack installs the Stackage libraries in ~/. stack and any project libraries or extra dependencies in a . stack-work directory within each project's directory.
stack build takes a list of one or more optional targets to be built. The supported syntaxes for targets are: package, e.g. stack build foobar , is the most commonly used target. It will try to find the package in the following locations: local packages, extra deps, snapshots, and package index (e.g. Hackage).
This is hpack, available here: https://github.com/sol/hpack
It's a slightly different package format, and, as you say, can be used to generate cabal files. It isn't directly tied to stack.
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