Initial commit

crane.nix

@@ -0,0 +1,77 @@
+craneFlake:
+{ config, lib, flake-parts-lib, ... }:
+let
+  inherit (lib) mkOption types mkIf mkDefault mkMerge;
+  inherit (flake-parts-lib) mkPerSystemOption;
+  cfg = config.rust.crane;
+  mkTcDefault = lib.mkOverride 900;
+in
+{
+  options = {
+    rust.crane = {
+      lib = mkOption {
+        type = types.anything;
+        default = craneFlake.lib;
+      };
+    };
+
+    perSystem = mkPerSystemOption {
+      _file = ./crane.nix;
+      options = {
+        rust.crane = {
+          toolchain = mkOption {
+            type = types.nullOr types.package;
+            default = null;
+          };
+
+          cargo = mkOption {
+            type = types.package;
+          };
+
+          clippy = mkOption {
+            type = types.package;
+          };
+
+          rustc = mkOption {
+            type = types.package;
+          };
+
+          rustfmt = mkOption {
+            type = types.package;
+          };
+        };
+      };
+    };
+  };
+
+  config.perSystem = psinputs@{ config, pkgs, system, inputs', ... }:
+    let cfg' = config.rust.crane;
+    in
+    {
+      config = mkMerge [
+        {
+          rust.crane.cargo = mkDefault pkgs.cargo;
+          rust.crane.rustc = mkDefault pkgs.rustc;
+          rust.crane.clippy = mkDefault pkgs.clippy;
+          rust.crane.rustfmt = mkDefault pkgs.rustfmt;
+        }
+
+        (mkIf (cfg'.toolchain != null) {
+          rust.crane.cargo = mkTcDefault cfg'.toolchain;
+          rust.crane.rustc = mkTcDefault cfg'.toolchain;
+          rust.crane.clippy = mkTcDefault cfg'.toolchain;
+          rust.crane.rustfmt = mkTcDefault cfg'.toolchain;
+        })
+
+        {
+          _module.args.craneLib = cfg.lib.${system}.overrideScope (_self: _super: {
+            cargo = cfg'.cargo;
+            clippy = cfg'.clippy;
+            rustc = cfg'.rustc;
+            rustfmt = cfg'.rustfmt;
+          });
+        }
+      ];
+
+    };
+}