feat: rearrange home-manager modules

home/dotnet.nix

@@ -0,0 +1,43 @@
+{ config, pkgs, ... }:
+
+with pkgs;
+let
+  dotnet-combined = with dotnetCorePackages; combinePackages [ sdk_3_1 sdk_2_1 ];
+  dotnetRoot = "${dotnet-combined}/bin";
+  dotnetSdk = "${dotnet-combined}/sdk";
+  dotnetBinary = "${dotnetRoot}/dotnet";
+in
+{
+  nixpkgs.overlays = [
+    (self: super: {
+      omnisharp-roslyn = super.omnisharp-roslyn.overrideAttrs (oldAttrs: rec {
+          version = "1.34.11";
+          src = fetchurl {
+            url = "https://github.com/OmniSharp/omnisharp-roslyn/releases/download/v${version}/omnisharp-mono.tar.gz";
+            sha256 = "0j55jrji7ya0pm91hfmyd9s6lkl35xbybr81a1gka90mlyp0gx63";
+          };
+      });
+    })
+  ];
+  
+  home.packages = [
+    dotnet-combined
+    omnisharp-roslyn
+  ];
+
+  home.sessionVariables = {
+    DOTNET_ROOT = dotnetRoot;
+    MSBuildSdksPath = "${dotnetSdk}/$(${dotnetBinary} --version)/Sdks";
+    MSBUILD_EXE_PATH = "${dotnetSdk}/$(${dotnetBinary} --version)/MSBuild.dll";
+  };
+
+  home.file.".omnisharp/omnisharp.json" = {
+    text = ''
+      {
+        "RoslynExtensionsOptions": {
+          "EnableAnalyzersSupport": true
+        }
+      }
+    '';
+  };
+}