Fix half of #288

src/main/java/ganymedes01/etfuturum/compat/CompatThaumcraft.java

@@ -9,6 +9,7 @@
 import thaumcraft.api.ThaumcraftApi;
 import thaumcraft.api.aspects.Aspect;
 import thaumcraft.api.aspects.AspectList;
+import thaumcraft.common.config.Config;
 
 public class CompatThaumcraft {
 
@@ -197,4 +198,8 @@ public static void doRecipes() {
 		// TODO is there supposed to be Thaumcraft related Recipes? If so, what would they be?
 	}
 
+	public static int getHasteEnchID() {
+		return Config.enchHaste.effectId;
+	}
+
 }

src/main/java/ganymedes01/etfuturum/mixins/backlytra/MixinEntityPlayer.java

@@ -1,10 +1,14 @@
 package ganymedes01.etfuturum.mixins.backlytra;
 
+import ganymedes01.etfuturum.compat.CompatThaumcraft;
+import ganymedes01.etfuturum.compat.ModsList;
 import ganymedes01.etfuturum.configuration.configs.ConfigFunctions;
 import ganymedes01.etfuturum.elytra.IElytraPlayer;
 import ganymedes01.etfuturum.items.equipment.ItemArmorElytra;
+import net.minecraft.enchantment.EnchantmentHelper;
 import net.minecraft.entity.EntityLivingBase;
 import net.minecraft.entity.player.EntityPlayer;
+import net.minecraft.entity.player.InventoryPlayer;
 import net.minecraft.entity.player.PlayerCapabilities;
 import net.minecraft.item.ItemStack;
 import net.minecraft.nbt.NBTTagCompound;
@@ -27,6 +31,9 @@ public abstract class MixinEntityPlayer extends EntityLivingBase implements IEly
 	@Shadow
 	protected abstract void setHideCape(int par1, boolean par2);
 
+	@Shadow
+	public InventoryPlayer inventory;
+
 	public MixinEntityPlayer(World p_i1594_1_) {
 		super(p_i1594_1_);
 	}
@@ -54,7 +61,23 @@ public void tickElytra() {
 		}
 
 		if (this.etfu$isElytraFlying()) {
-			this.etfu$ticksElytraFlying = this.etfu$ticksElytraFlying + 1;
+			this.etfu$ticksElytraFlying += 1;
+			if (ModsList.THAUMCRAFT.isLoaded() && inventory.armorItemInSlot(0) != null && moveForward > 0.0F) {
+				//Counteract haste boots Thaumcraft enchantment.
+				//Since Thaumcraft applies the speed no matter what, this causes practically limitless elytra flight.
+				int haste = EnchantmentHelper.getEnchantmentLevel(CompatThaumcraft.getHasteEnchID(), inventory.armorItemInSlot(0));
+				if (haste > 0) {
+					float bonus = haste * 0.015F;
+					if (isAirBorne) {
+						bonus *= 0.5F;
+					}
+					if (isInWater()) {
+						bonus *= 0.5F;
+					}
+					//Apply the same code for movement, but use -1.0F instead of 1.0F so it does the exact opposite so it cancels the Thaumcraft movement.
+					moveFlying(0.0F, -1.0F, bonus);
+				}
+			}
 		} else {
 			this.etfu$ticksElytraFlying = 0;
 		}