1 files changed, 74 insertions, 0 deletions
diff --git a/nixpkgs/pkgs/build-support/dart/build-dart-application/generators.nix b/nixpkgs/pkgs/build-support/dart/build-dart-application/generators.nix
new file mode 100644
index 000000000000..f01a09305dba
--- /dev/null
+++ b/nixpkgs/pkgs/build-support/dart/build-dart-application/generators.nix
@@ -0,0 +1,74 @@
+{ lib
+, stdenvNoCC
+, dart
+, dartHooks
+, jq
+, yq
+, cacert
+}:
+
+{
+  # Arguments used in the derivation that builds the Dart package.
+  # Passing these is recommended to ensure that the same steps are made to
+  # prepare the sources in both this derivation and the one that builds the Dart
+  # package.
+  buildDrvArgs ? { }
+, ...
+}@args:
+
+# This is a derivation and setup hook that can be used to fetch dependencies for Dart projects.
+# It is designed to be placed in the nativeBuildInputs of a derivation that builds a Dart package.
+# Providing the buildDrvArgs argument is highly recommended.
+let
+  buildDrvInheritArgNames = [
+    "name"
+    "pname"
+    "version"
+    "src"
+    "sourceRoot"
+    "setSourceRoot"
+    "preUnpack"
+    "unpackPhase"
+    "unpackCmd"
+    "postUnpack"
+    "prePatch"
+    "patchPhase"
+    "patches"
+    "patchFlags"
+    "postPatch"
+  ];
+
+  buildDrvInheritArgs = builtins.foldl'
+    (attrs: arg:
+      if buildDrvArgs ? ${arg}
+      then attrs // { ${arg} = buildDrvArgs.${arg}; }
+      else attrs)
+    { }
+    buildDrvInheritArgNames;
+
+  drvArgs = buildDrvInheritArgs // (removeAttrs args [ "buildDrvArgs" ]);
+  name = (if drvArgs ? name then drvArgs.name else "${drvArgs.pname}-${drvArgs.version}");
+
+  # Adds the root package to a dependency package_config.json file from pub2nix.
+  linkPackageConfig = { packageConfig, extraSetupCommands ? "" }: stdenvNoCC.mkDerivation (drvArgs // {
+    name = "${name}-package-config-with-root.json";
+
+    nativeBuildInputs = drvArgs.nativeBuildInputs or [ ] ++ args.nativeBuildInputs or [ ] ++ [ jq yq ];
+
+    dontBuild = true;
+
+    installPhase = ''
+      runHook preInstall
+
+      packageName="$(yq --raw-output .name pubspec.yaml)"
+      jq --arg name "$packageName" '.packages |= . + [{ name: $name, rootUri: "../", packageUri: "lib/" }]' '${packageConfig}' > "$out"
+      ${extraSetupCommands}
+
+      runHook postInstall
+    '';
+  });
+in
+{
+  inherit
+    linkPackageConfig;
+}