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{ dhallPackages, dhallPackageToNix}:
# `dhallDirectoryToNix is a utility function to take a directory of Dhall files
# and read them in as a Nix expression.
#
# This function is similar to `dhallToNix`, but takes a Nixpkgs Dhall package
# as input instead of raw Dhall code.
#
# Note that this uses "import from derivation" (IFD), meaning that Nix will
# perform a build during the evaluation phase if you use this
# `dhallDirectoryToNix` utility. It is not possible to use
# `dhallDirectoryToNix` in Nixpkgs, since the Nixpkgs Hydra doesn't allow IFD.
{ src
, # The file to import, relative to the src root directory
file ? "package.dhall"
}@args:
let
generatedPkg = dhallPackages.generateDhallDirectoryPackage args;
builtPkg = dhallPackages.callPackage generatedPkg { };
in
dhallPackageToNix builtPkg
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