Convert Reactor.Shared to a source-only nuget package

Reactor.Networking.Shared/Mod.cs

@@ -0,0 +1,88 @@
+#nullable enable
+
+using System;
+using System.Collections.Generic;
+using System.Diagnostics.CodeAnalysis;
+using System.Linq;
+using System.Text;
+
+namespace Reactor.Networking;
+
+public readonly struct Mod
+{
+    public Mod(string id, string version, ModFlags flags, string? name = null)
+    {
+        Id = id;
+        Version = version;
+        Flags = flags;
+        Name = name;
+    }
+
+    public string Id { get; }
+    public string Version { get; }
+    public ModFlags Flags { get; }
+    public string? Name { get; }
+
+    public bool IsRequiredOnAllClients => (Flags & ModFlags.RequireOnAllClients) != 0;
+
+    public bool Equals(Mod other)
+    {
+        return Id == other.Id && Version == other.Version;
+    }
+
+    public override bool Equals(object? obj)
+    {
+        return obj is Mod other && Equals(other);
+    }
+
+    public static bool operator ==(Mod left, Mod right)
+    {
+        return left.Equals(right);
+    }
+
+    public static bool operator !=(Mod left, Mod right)
+    {
+        return !(left == right);
+    }
+
+    public override int GetHashCode()
+    {
+        return HashCode.Combine(Id, Version);
+    }
+
+    public override string ToString()
+    {
+        return $"{Name ?? Id} ({Version})";
+    }
+
+    internal static bool Validate(IReadOnlyCollection<Mod> clientMods, IReadOnlyCollection<Mod> hostMods, [NotNullWhen(false)] out string? reason)
+    {
+        var clientMissing = hostMods.Where(mod => mod.IsRequiredOnAllClients && !clientMods.Contains(mod)).ToArray();
+        var hostMissing = clientMods.Where(mod => mod.IsRequiredOnAllClients && !hostMods.Contains(mod)).ToArray();
+
+        if (clientMissing.Any() || hostMissing.Any())
+        {
+            var message = new StringBuilder();
+
+            if (clientMissing.Any())
+            {
+                message.Append("You are missing: ");
+                message.AppendJoin(", ", clientMissing.Select(x => x.ToString()));
+                message.AppendLine();
+            }
+
+            if (hostMissing.Any())
+            {
+                message.Append("Host is missing: ");
+                message.AppendJoin(", ", hostMissing.Select(x => x.ToString()));
+                message.AppendLine();
+            }
+
+            reason = message.ToString();
+            return false;
+        }
+
+        reason = null;
+        return true;
+    }
+}