Lexicon can be placed in bookshelf and on lectern (fixes #4488)

Xplat/src/main/java/vazkii/botania/data/ItemTagProvider.java

@@ -87,6 +87,8 @@ protected void addTags(HolderLookup.Provider provider) {
 				BotaniaBlocks.hourglass.asItem(), BotaniaBlocks.manaPylon.asItem(), monocle);
 		this.tag(ItemTags.MUSIC_DISCS).add(recordGaia1, recordGaia2);
 		this.tag(ItemTags.CLUSTER_MAX_HARVESTABLES).add(manasteelPick, elementiumPick, terraPick, glassPick);
+		this.tag(ItemTags.LECTERN_BOOKS).add(lexicon);
+		this.tag(ItemTags.BOOKSHELF_BOOKS).add(lexicon);
 
 		this.tag(BotaniaTags.Items.DUSTS_MANA).add(manaPowder);
 

Xplat/src/main/java/vazkii/botania/mixin/LecternEventHandlerMixin.java

@@ -0,0 +1,43 @@
+package vazkii.botania.mixin;
+
+import net.minecraft.server.level.ServerPlayer;
+import net.minecraft.world.InteractionHand;
+import net.minecraft.world.InteractionResult;
+import net.minecraft.world.entity.player.Player;
+import net.minecraft.world.level.Level;
+import net.minecraft.world.level.block.entity.BlockEntityType;
+import net.minecraft.world.phys.BlockHitResult;
+
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfoReturnable;
+
+import vazkii.botania.common.advancements.UseItemSuccessTrigger;
+import vazkii.botania.common.item.BotaniaItems;
+import vazkii.patchouli.common.handler.LecternEventHandler;
+
+@Mixin(LecternEventHandler.class)
+public class LecternEventHandlerMixin {
+	/**
+	 * Hooks into the Patchouli lectern event handler, right before the call to {@code openBookGUI}, to properly award
+	 * the lexicon reading advancement if read via a lectern instead of via the book item directly.
+	 */
+	@Inject(
+		method = "rightClick(Lnet/minecraft/world/entity/player/Player;Lnet/minecraft/world/level/Level;Lnet/minecraft/world/InteractionHand;Lnet/minecraft/world/phys/BlockHitResult;)Lnet/minecraft/world/InteractionResult;",
+		at = @At(value = "INVOKE", target = "Lvazkii/patchouli/api/PatchouliAPI$IPatchouliAPI;openBookGUI(Lnet/minecraft/server/level/ServerPlayer;Lnet/minecraft/resources/ResourceLocation;)V")
+	)
+	private static void checkUseLexicon(Player player, Level world, InteractionHand hand, BlockHitResult hit, CallbackInfoReturnable<InteractionResult> cir) {
+		if (!(player instanceof ServerPlayer serverPlayer)) {
+			return;
+		}
+		final var blockEntity = world.getBlockEntity(hit.getBlockPos(), BlockEntityType.LECTERN);
+		blockEntity.ifPresent(lecternBlockEntity -> {
+			final var itemStack = lecternBlockEntity.getBook();
+			if (itemStack.is(BotaniaItems.lexicon)) {
+				UseItemSuccessTrigger.INSTANCE.trigger(serverPlayer, itemStack, serverPlayer.serverLevel(),
+						player.getX(), player.getY(), player.getZ());
+			}
+		});
+	}
+}

Xplat/src/main/resources/botania_xplat.mixins.json

@@ -28,6 +28,7 @@
     "ItemEntityAccessor",
     "ItemEntityMixin",
     "ItemMixin",
+    "LecternEventHandlerMixin",
     "LevelAccessor",
     "LivingEntityAccessor",
     "LoomMenuMixin",