Build/CI: Add base nix build for cross compiles from linux

.envrc

@@ -0,0 +1 @@
+use flake

.gitignore

@@ -60,3 +60,7 @@ _ReSharper*/
 artifacts/
 # Scanner configuration file (user-specific)
 scan_config.ini
+
+result
+out
+.direnv

BFD9010/BFD9010.Gui/BFD9010.Gui.csproj

@@ -9,6 +9,7 @@
     <AssemblyName>bfd9010</AssemblyName>
     <Platforms>AnyCPU;x86</Platforms>
     <PlatformTarget>x86</PlatformTarget>
+    <EnableWindowsTargeting>true</EnableWindowsTargeting>
     <ApplicationIcon>..\..\documentation\images\BFD9000_logo_white.ico</ApplicationIcon>
   </PropertyGroup>
 

BFD9010/BFD9010.Scanner/ScanConfig.cs

@@ -8,7 +8,7 @@ namespace BFD9010.Scanner
     /// </summary>
     public class ScanConfig
     {
-        private const string CONFIG_FILENAME = "scan_config.ini";
+        private const string CONFIG_FILENAME = "~\\Desktop\\VidarScans\\scan_config.ini";
 
         // Scan parameters with their default values (from original code before PR)
         public short Offset0_BitDepth { get; set; } = 16;
@@ -296,9 +296,16 @@ private void SetValue(string key, string value)
 
         private static string GetConfigPath()
         {
-            // Place config file in the same directory as the executable
-            string exeDir = AppDomain.CurrentDomain.BaseDirectory;
-            return Path.Combine(exeDir, CONFIG_FILENAME);
+            string outDir = Environment.ExpandEnvironmentVariables(CONFIG_FILENAME);
+            if (outDir.StartsWith('~'))
+            {
+                var home = Environment.GetFolderPath(Environment.SpecialFolder.UserProfile);
+                string rest = outDir.Length == 1 ? string.Empty : outDir.Substring(1).TrimStart('\\', '/');
+                outDir = Path.Combine(home, rest);
+            }
+            outDir = Path.GetFullPath(outDir);
+            Directory.CreateDirectory(Path.GetDirectoryName(outDir));
+            return outDir;
         }
 
         private static string ExpandPath(string path)

flake.nix

@@ -0,0 +1,100 @@
+{
+  description = "BFD9010: An HL7 FHIR API for Scanners";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs =
+    { nixpkgs, utils, ... }:
+    utils.lib.eachDefaultSystem (
+      system:
+      let
+        pkgs = import nixpkgs { inherit system; };
+      in
+      {
+        packages = rec {
+          nugetDeps = pkgs.dotnetCorePackages.addNuGetDeps {
+            nugetDeps = ./nix/deps.json;
+          };
+          default = app;
+          base = {
+            pname = "BFD9010.Gui";
+            version = "1.0.0";
+            src = ./.;
+
+            nativeBuildInputs = [
+              pkgs.dotnetCorePackages.sdk_8_0
+              pkgs.cacert
+            ];
+
+            # Explicitly set runtimeId to null to block the host-side targeting pack additions
+            runtimeId = null;
+
+            # Explicitly feed our win-x64 target down into the underlying NuGet fetcher mapping
+            # meta.platforms = [ "x86_64-windows" ];
+
+            configurePhase = ''
+              export HOME=$TMPDIR
+              export DOTNET_CLI_HOME=$TMPDIR
+
+              # The addNuGetDeps hook outputs its organized cache folder to $nugetDeps
+              # We map the standard .NET environment variable straight to it
+              export NUGET_PACKAGES=$nugetDeps
+            '';
+
+            buildPhase = ''
+              # Pure offline compilation phase using only the decoupled Windows targets
+              dotnet restore BFD9010/BFD9010.Gui/BFD9010.Gui.csproj \
+                -r win-x86 \
+                --source "$nugetDeps" \
+                -p:EnableWindowsTargeting=true
+
+              dotnet publish BFD9010/BFD9010.Gui/BFD9010.Gui.csproj \
+                -c Release \
+                -r win-x86 \
+                --no-restore \
+                -p:TargetFramework=net8.0-windows \
+                --self-contained true \
+                -o $out/share/bfd9010
+            '';
+
+            installPhase = ''
+              mkdir -p $out/bin
+
+              cat <<EOF > $out/bin/bfd9010-server
+              #!/usr/bin/env bash
+              export WINEDEBUG=-all
+              export WINEARCH=win32
+                export WINEPREFIX=\$HOME/.local/share/bfd9010-wine
+                if [ ! -d "\$WINEPREFIX" ]; then
+                  echo "Initializing 32-bit Wine environment..."
+                  ${pkgs.wine}/bin/wineboot -u
+                fi
+              exec ${pkgs.wine}/bin/wine $out/share/bfd9010/bfd9010.exe "\$@"
+              EOF
+
+              chmod +x $out/bin/bfd9010-server
+            '';
+          };
+          app = pkgs.stdenv.mkDerivation (nugetDeps base);
+        };
+
+        # Spin up a quick development shell with 'nix develop'
+        devShells.default = pkgs.mkShell {
+          buildInputs = with pkgs; [
+            dotnetCorePackages.runtime_8_0
+            dotnetCorePackages.sdk_8_0
+            nuget-to-json
+            nil
+            nixd
+          ];
+
+          shellHook = ''
+            export DOTNET_ROOT="${pkgs.dotnetCorePackages.sdk_10_0}/share/dotnet"
+          '';
+        };
+      }
+    );
+}