Add fsharp-interactive

runtimes/default.nix

@@ -55,4 +55,5 @@ args: {
     "rust" = import ./rust.nix args;
     "dotnet-sdk-csharp" = import ./dotnet-sdk-csharp.nix args;
     "dotnet-sdk-fsharp" = import ./dotnet-sdk-fsharp.nix args;
+    "dotnet-sdk-fsharp-interactive" = import ./dotnet-sdk-fsharp-interactive.nix args;
 }

runtimes/dotnet-sdk-fsharp-interactive.nix

@@ -0,0 +1,52 @@
+{pkgs, piston, ...}:
+let
+    pkg = pkgs.dotnet-sdk;
+in piston.mkRuntime {
+    language = "fsharp-interactive";
+    version = pkg.version;
+    runtime = "dotnet-sdk";
+
+    aliases = [
+        "fsi"
+        "fsx"
+        "fsi.net"
+        "fsi-dotnet"
+        "dotnet-fsi"
+        "fsharp-interactive.net"
+        "fsharp-interactive-dotnet"
+        "dotnet-fsharp-interactive"
+        "f#-interactive"
+        "f#-interactive.net"
+        "f#-interactive-dotnet"
+        "dotnet-f#-interactive"
+        "fs-interactive"
+        "fs-interactive.net"
+        "fs-interactive-dotnet"
+        "dotnet-fs-interactive"
+    ];
+
+    run = ''
+        export HOME=$PWD
+        FILENAME=$1
+        rename 's/$/\.fsx/' $FILENAME # Add .fsx extension
+        shift
+        ${pkg}/dotnet fsi --help > /dev/null
+        ${pkg}/dotnet fsi $FILENAME.fsx "$@"
+        '';
+
+    tests = [
+        (piston.mkTest {
+            files = {
+                "test.fsx" = ''
+                    open System
+                    let args : string array = fsi.CommandLineArgs |> Array.tail
+                    Console.WriteLine args[0]
+                '';
+            };
+            args = ["OK"];
+            stdin = "";
+            packages = [];
+            main = "test.fsx";
+        })
+    ];
+}