push sheeet

pkgs/development/interpreters/dhall/build-dhall-github-package.nix

@@ -0,0 +1,71 @@
+{
+  buildDhallPackage,
+  fetchFromGitHub,
+  lib,
+}:
+
+# This function is used by `dhall-to-nixpkgs` when given a GitHub repository
+lib.makePackageOverridable (
+  {
+    # Arguments passed through to `buildDhallPackage`
+    name,
+    dependencies ? [ ],
+    source ? false,
+
+    # The directory containing the Dhall files, if other than the root of the
+    # repository
+    directory ? "",
+    # The file to import, relative to the above directory
+    file ? "package.dhall",
+    # Set to `true` to generate documentation for the package
+    document ? false,
+
+    # Arguments passed through to `fetchFromGitHub`
+    owner,
+    repo,
+    rev,
+    # Extra arguments passed through to `fetchFromGitHub`, such as the hash
+    # or `fetchSubmodules`
+    ...
+  }@args:
+
+  let
+    versionedName = "${name}-${rev}";
+
+    src = fetchFromGitHub (
+      {
+        name = "${versionedName}-source";
+
+        inherit owner repo rev;
+      }
+      // removeAttrs args [
+        "name"
+        "dependencies"
+        "document"
+        "source"
+        "directory"
+        "file"
+        "owner"
+        "repo"
+        "rev"
+      ]
+    );
+
+    prefix = lib.optionalString (directory != "") "/${directory}";
+
+  in
+  buildDhallPackage (
+    {
+      inherit dependencies source;
+
+      name = versionedName;
+
+      code = "${src}${prefix}/${file}";
+    }
+    // lib.optionalAttrs document {
+      documentationRoot = "${src}/${prefix}";
+
+      baseImportUrl = "https://raw.githubusercontent.com/${owner}/${repo}/${rev}${prefix}";
+    }
+  )
+)