feat: add nix pkg for doc and clippy checks

Signed-off-by: Florian Hartung <florian.hartung@dlr.de>

Author: florianhartung

flake.nix

@@ -300,6 +300,8 @@
                 useNextest = false;
               };
 
+              workspace-checks = self.packages.${system}.rust-workspace;
+
               # check that the requirements can be parsed
               requirements = pkgs.runCommand "check-requirement" { nativeBuildInputs = [ pkgs.strictdoc ]; } ''
                 shopt -s globstar

pkgs/rust-workspace.nix

@@ -0,0 +1,79 @@
+{
+  lib,
+  rustPlatform,
+  clippy,
+}:
+
+let
+  cargoToml = builtins.fromTOML (builtins.readFile ../Cargo.toml);
+in
+rustPlatform.buildRustPackage rec {
+  pname = "rust-workspace";
+  version = cargoToml.package.version;
+
+  src =
+    let
+      # original source to read from
+      src = ./..;
+
+      # File suffices to include
+      extensions = [
+        "lock"
+        "rs"
+        "toml"
+        "wast"
+      ];
+      # Files to explicitly include
+      include = [ ];
+      # Files to explicitly exclude
+      exclude = [
+        "flake.lock"
+        "treefmt.toml"
+      ];
+
+      filter = (
+        path: type:
+        let
+          inherit (builtins) baseNameOf toString;
+          inherit (lib.lists) any;
+          inherit (lib.strings) hasSuffix removePrefix;
+          inherit (lib.trivial) id;
+
+          # consumes a list of bools, returns true if any of them is true
+          anyof = any id;
+
+          basename = baseNameOf (toString path);
+          relative = removePrefix (toString src + "/") (toString path);
+        in
+        (anyof [
+          (type == "directory")
+          (any (ext: hasSuffix ".${ext}" basename) extensions)
+          (any (file: file == relative) include)
+        ])
+        && !(anyof [ (any (file: file == relative) exclude) ])
+      );
+    in
+    lib.sources.cleanSourceWith { inherit src filter; };
+
+  cargoLock.lockFile = src + "/Cargo.lock";
+
+  dontBuild = true;
+  doCheck = true;
+  checkPhase = ''
+    RUSTDOCFLAGS="-Dwarnings" cargo doc --workspace --all-features --document-private-items
+    RUSTFLAGS="-Dwarnings" ${clippy}/bin/cargo-clippy --workspace --all-features
+  '';
+  installPhase = ''
+    mkdir "$out"
+  '';
+
+  meta = {
+    description = "Checks for the Rust workspace";
+    license = with lib.licenses; [
+      asl20
+      # OR
+      mit
+    ];
+    maintainers = [ ];
+  };
+}