Unity3d F# AssetPostprocessor

FSharpPostprocessor.cs

using System.IO;
using UnityEngine;
using UnityEditor;
using UnityEditorInternal;
using System.Linq;
using System.Reflection;

/// <summary>
///   Rebuilds the Fsharp solution upon Fsharp source file changes.
///   Approach from IdrisUnityPlayground https://github.com/bamboo/IdrisUnityPlayground/blob/master/Assets/Editor/IdrisPostprocessor.cs
/// </summary>
public class FSharpPostprocessor : AssetPostprocessor {

    static string xbuild = HomePath("/usr/local/bin/xbuild");

    static void OnPostprocessAllAssets(string[] importedAssets, string[] deletedAssets, string[] movedAssets, string[] movedFromAssetPaths) {

        if(!importedAssets.Concat(deletedAssets).Concat(movedAssets).Concat(movedFromAssetPaths).Any(IsFsharpFile))
            return;


        Debug.Log("Starting FSharp build");

        var packagePath = ProjectPath();
        var processStartInfo = new System.Diagnostics.ProcessStartInfo {
            FileName = xbuild,
                     Arguments = packagePath + "/Assembly-FSharp-Editor.sln",
                     RedirectStandardOutput = true,
                     RedirectStandardError = true,
                     UseShellExecute = false,
        };

        var fsharp = System.Diagnostics.Process.Start(processStartInfo);
        fsharp.WaitForExit();
        if(fsharp.ExitCode == 0) {
            Debug.Log("Fsharp build successful.");
            AssetDatabase.ImportAsset("Assets/UnityFSharp.dll");
        } else
            Debug.LogError("Fsharp build failed:\n" + fsharp.StandardOutput.ReadToEnd() + fsharp.StandardError.ReadToEnd());
    }

    static string HomePath(string path) {
        return Path.Combine(System.Environment.GetFolderPath(System.Environment.SpecialFolder.Personal), path);
    }

    static string ProjectPath() {
        return Path.GetFullPath(Path.Combine(Application.dataPath, @"../"));
    }

    static bool IsFsharpFile(string f) {
        var ext = Path.GetExtension(f);
        return ext.CompareTo(".fs") == 0;
    }
}