459cf94991
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
50 lines
1.2 KiB
Nix
50 lines
1.2 KiB
Nix
{ buildDhallPackage, fetchFromGitHub, lib }:
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# This function is used by `dhall-to-nixpkgs` when given a GitHub repository
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lib.makeOverridable
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( { # Arguments passed through to `buildDhallPackage`
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name
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, dependencies ? []
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, source ? false
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, # The directory containing the Dhall files, if other than the root of the
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# repository
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directory ? ""
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, # The file to import, relative to the above directory
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file ? "package.dhall"
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# Arguments passed through to `fetchFromGitHub`
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, owner
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, repo
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, rev
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# Extra arguments passed through to `fetchFromGitHub`, such as the hash
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# or `fetchSubmodules`
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, ...
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}@args:
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buildDhallPackage {
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inherit name dependencies source;
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code =
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let
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src = fetchFromGitHub ({
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name = "${name}-source";
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inherit owner repo rev;
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} // removeAttrs args [
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"name"
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"dependencies"
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"source"
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"directory"
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"file"
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"owner"
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"repo"
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"rev"
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]);
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prefix = lib.optionalString (directory != "") "${directory}/";
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in
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"${src}/${prefix}${file}";
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}
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)
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