1 files changed, 37 insertions, 1 deletions
diff --git a/nixpkgs/pkgs/build-support/writers/default.nix b/nixpkgs/pkgs/build-support/writers/default.nix
index 30301e3b2e54..0fb9bd939a58 100644
--- a/nixpkgs/pkgs/build-support/writers/default.nix
+++ b/nixpkgs/pkgs/build-support/writers/default.nix
@@ -1,4 +1,4 @@
-{ pkgs, config, buildPackages, lib, stdenv, libiconv, gawk, gnused, gixy }:
+{ pkgs, config, buildPackages, lib, stdenv, libiconv, mkNugetDeps, mkNugetSource, gawk, gnused, gixy }:
 
 let
   aliases = if (config.allowAliases or true) then (import ./aliases.nix lib) else prev: {};
@@ -301,6 +301,42 @@ let
   writePyPy3Bin = name:
     writePyPy3 "/bin/${name}";
 
+
+  makeFSharpWriter = { dotnet-sdk ? pkgs.dotnet-sdk, fsi-flags ? "", libraries ? _: [] }: nameOrPath:
+  let
+    fname = last (builtins.split "/" nameOrPath);
+    path = if strings.hasSuffix ".fsx" nameOrPath then nameOrPath else "${nameOrPath}.fsx";
+    _nugetDeps = mkNugetDeps { name = "${fname}-nuget-deps"; nugetDeps = libraries; };
+
+    nuget-source = mkNugetSource {
+      name = "${fname}-nuget-source";
+      description = "A Nuget source with the dependencies for ${fname}";
+      deps = [ _nugetDeps ];
+    };
+
+    fsi = writeBash "fsi" ''
+      export DOTNET_SKIP_FIRST_TIME_EXPERIENCE=1
+      export DOTNET_CLI_TELEMETRY_OPTOUT=1
+      export DOTNET_NOLOGO=1
+      script="$1"; shift
+      ${dotnet-sdk}/bin/dotnet fsi --quiet --nologo --readline- ${fsi-flags} "$@" < "$script"
+    '';
+
+  in content: writers.makeScriptWriter {
+    interpreter = fsi;
+  } path
+  ''
+    #i "nuget: ${nuget-source}/lib"
+    ${ content }
+    exit 0
+  '';
+
+  writeFSharp =
+    makeFSharpWriter {};
+
+  writeFSharpBin = name:
+    writeFSharp "/bin/${name}";
+
 };
 in
 writers // (aliases writers)