first commit

src/main/java/de/guntram/mcmod/beenfo/Beenfo.java

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+package de.guntram.mcmod.beenfo;
+
+import net.fabricmc.api.ClientModInitializer;
+
+
+public class Beenfo implements ClientModInitializer
+{
+    public static final String MODID = "beenfo";
+    public static final String MODNAME = "Beenfo";
+    public static final String VERSION = "1.15-fabric0.4.23-1.0";
+
+    @Override
+    public void onInitializeClient() {
+    }
+}

src/main/java/de/guntram/mcmod/beenfo/mixin/TooltipMixin.java

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+package de.guntram.mcmod.beenfo.mixin;
+
+import java.util.List;
+import net.minecraft.client.item.TooltipContext;
+import net.minecraft.entity.player.PlayerEntity;
+import net.minecraft.item.Item;
+import net.minecraft.item.Items;
+import net.minecraft.item.ItemStack;
+import net.minecraft.nbt.CompoundTag;
+import net.minecraft.text.LiteralText;
+import net.minecraft.text.Text;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfoReturnable;
+import org.spongepowered.asm.mixin.injection.callback.LocalCapture;
+
+@Mixin(ItemStack.class)
+public abstract class TooltipMixin {
+
+    @Shadow public abstract boolean isEmpty();
+    @Shadow public abstract Item getItem();
+    @Shadow public abstract CompoundTag getTag();
+
+//    @Inject(method="getTooltip(Lnet/minecraft/entity/player/EntityPlayer;Lnet/minecraft/client/util/ITooltipFlag;)Ljava/util/List",
+    @Inject(method="getTooltip",            
+            at=@At("RETURN"), locals=LocalCapture.CAPTURE_FAILHARD, cancellable=true)
+    private void getTooltipdone(PlayerEntity playerIn, TooltipContext advanced, 
+            CallbackInfoReturnable<List> ci,
+            List<Text> list) {
+
+        try {
+            if (!this.isEmpty() && (this.getItem() == Items.BEE_HIVE || this.getItem() == Items.BEE_NEST)) {
+                CompoundTag tag = this.getTag();
+                if (tag != null) {
+                    String honeyLevel = tag.getCompound("BlockStateTag").getString("honey_level");  // wtf this is a string ???
+                    int beeCount   = tag.getCompound("BlockEntityTag").getList("Bees", 10).size();
+                    list.add(new LiteralText(honeyLevel+" honey"));
+                    list.add(new LiteralText(beeCount+   " bees"));
+                }
+            }
+        } catch (NullPointerException ex) {
+                System.out.println("NPE in getTooltipdone");
+                try {
+                    Item item = this.getItem();
+                    if (item == null) {
+                        System.out.println("item is null");
+                    } else {
+                        System.out.println("item is "+this.getItem().getTranslationKey());
+                    }
+                } catch (NullPointerException ex2) {
+
+                }
+        }
+        ci.setReturnValue(list);
+    }
+}

src/main/resources/fabric.mod.json

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+{
+    "schemaVersion": 1,
+    "id": "beenfo",
+    "version": "1.15-fabric0.4.23-1.0",
+    "environment": "client",
+    "entrypoints": {
+        "client": [ "de.guntram.mcmod.beenfo.Beenfo" ]
+    },
+    "custom": {
+        "modmenu:clientsideOnly": true
+    },
+    "mixins": [
+      	"mixins.beenfo.json"
+    ],
+    "depends": {
+      "fabric": "*"
+    },
+    "recommends": {
+      "modmenu" : "*"
+    },
+    "name": "Beenfo",
+    "description": "Adds a tooltip to bee nests and hives that shows how much honey, and how many bees, are contained.\n\n.If you like bees, and like this mod, please consider getting more information about them at https://beyondpesticides.org/programs/bee-protective-pollinators-and-pesticides/bee-protective.",
+    "icon": "pack.png",
+    "authors": [ "Giselbaer" ],
+    "contact": {
+        "homepage": "https://minecraft.curseforge.com/projects/beenfo",
+        "sources": "https://github.com/gbl/Beenfo",
+        "issues": "https://github.com/gbl/Beenfo/issues"
+    }
+}

src/main/resources/mixins.beenfo.json

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+{
+    "required": true,
+    "package": "de.guntram.mcmod.beenfo.mixin",
+    "refmap": "Beenfo-refmap.json",
+    "minVersion": "0.6",
+    "client": [
+        "TooltipMixin"
+    ],
+    "injectors": {
+        "defaultRequire": 1
+    }
+}

src/main/resources/pack.mcmeta

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+{
+    "pack": {
+        "pack_format": 4,
+        "description": "Beenfo"
+    }
+}