nixpkgs/pkgs/development/interpreters/dhall/build-dhall-directory-package.nix
Gabriel Gonzalez 459cf94991 Nixpkgs support for dhall-to-nixpkgs
The motivation for this change is to enable a new Dhall command-line
utility called `dhall-to-nixpkgs` which converts Dhall packages to
buildable Nix packages.  You can think of `dhall-to-nixpkgs` as the
Dhall analog of `cabal2nix`.

You can find the matching pull request for `dhall-to-nixpkgs` here:

https://github.com/dhall-lang/dhall-haskell/pull/1826

The two main changes required to support `dhall-to-nixpkgs` are:

* Two new `buildDhall{Directory,GitHub}Package` utilities are added

  `dhall-to-nixpkgs` uses these in the generated output

* `pkgs.dhallPackages` now selects a default version for each package
  using the `prefer` utility

  All other versions are still buildable via a `passthru` attribute
2020-06-17 15:57:21 +02:00

26 lines
609 B
Nix

{ buildDhallPackage, lib }:
# This is a minor variation on `buildDhallPackage` that splits the `code`
# argument into `src` and `file` in such a way that you can easily override
# the `file`
#
# This function is used by `dhall-to-nixpkgs` when given a directory
lib.makeOverridable
( { # Arguments passed through to `buildDhallPackage`
name
, dependencies ? []
, source ? false
, src
, # The file to import, relative to the root directory
file ? "package.dhall"
}:
buildDhallPackage {
inherit name dependencies source;
code = "${src}/${file}";
}
)