Added hard-locking mechanism

Nautilus/Assets/Gadgets/ScanningGadget.cs

@@ -17,7 +17,12 @@ public class ScanningGadget : Gadget
     /// <summary>
     /// Classifies this item as buildable via the habitat builder.
     /// </summary>
-    public bool IsBuildable { get; set; }
+    public bool IsBuildable { get; private set; }
+
+    /// <summary>
+    /// Marks this item as hard locked.
+    /// </summary>
+    public bool IsHardLocked { get; private set; }
 
     /// <summary>
     /// The blueprint that must first be scanned or picked up to unlocked this item.
@@ -191,6 +196,18 @@ public ScanningGadget SetBuildable(bool isBuildable = true)
         return this;
     }
 
+    /// <summary>
+    /// Makes this item hard locked. Hard locked items are not unlocked by default even in creative and can't be unlocked using the `unlockall` command.
+    /// </summary>
+    /// <param name="isHardLocked">Should this item be hard locked?</param>
+    /// <returns>A reference to this instance after the operation has completed.</returns>
+    public ScanningGadget SetHardLocked(bool isHardLocked = true)
+    {
+        IsHardLocked = isHardLocked;
+
+        return this;
+    }
+
     /// <summary>
     /// <para>Adds an encyclopedia entry for this item in the PDA. This method does not ask for display text, for that you must use the <see cref="LanguageHandler"/>.</para>
     /// <para>The encyclopedia entry's key will be set as the TechType string.</para>
@@ -363,5 +380,10 @@ protected internal override void Build()
         {
             KnownTechPatcher.LockedWithNoUnlocks.Add(prefab.Info.TechType);
         }
+
+        if (IsHardLocked)
+        {
+            KnownTechHandler.SetHardLocked(prefab.Info.TechType);
+        }
     }
 }

Nautilus/Handlers/KnownTechHandler.cs

@@ -38,6 +38,20 @@ public static void AddRequirementForUnlock(TechType blueprint, TechType requirem
         Reinitialize();
     }
 
+    /// <summary>
+    /// Makes the specified tech type hard locked. Hard locking means that the tech type will not be unlocked via the unlockall command and will not be unlocked by default
+    /// in creative. 
+    /// </summary>
+    /// <remarks>Calling this method will remove the specified item from being unlocked at start.</remarks>
+    /// <param name="techType">The tech type to set as hard locked.</param>
+    /// <seealso cref="UnlockOnStart"/>
+    public static void SetHardLocked(TechType techType)
+    {
+        KnownTechPatcher.HardLocked.Add(techType);
+        KnownTechPatcher.UnlockedAtStart.Remove(techType);
+        Reinitialize();
+    }
+
     internal static void AddAnalysisTech(KnownTech.AnalysisTech analysisTech)
     {
         if (analysisTech.techType != TechType.None)

Nautilus/Patchers/KnownTechPatcher.cs

@@ -12,6 +12,7 @@ internal class KnownTechPatcher
 
     internal static HashSet<TechType> UnlockedAtStart = new();
     internal static HashSet<TechType> LockedWithNoUnlocks = new();
+    internal static HashSet<TechType> HardLocked = new();
     internal static HashSet<TechType> RemovalTechs = new();
     internal static IDictionary<TechType, KnownTech.AnalysisTech> AnalysisTech = new SelfCheckingDictionary<TechType, KnownTech.AnalysisTech>("AnalysisTech", AsStringFunction);
     internal static IDictionary<TechType, List<TechType>> BlueprintRequirements = new SelfCheckingDictionary<TechType, List<TechType>>("BlueprintRequirements", AsStringFunction);
@@ -129,5 +130,6 @@ private static void GetAllUnlockablesPostfix(HashSet<TechType> __result)
     {
         var filtered = CraftData.FilterAllowed(LockedWithNoUnlocks);
         __result.AddRange(filtered);
+        __result.RemoveRange(HardLocked);
     }
 }