First push

src/main/java/ru/bitheaven/createastrafabric/CreateAstraFabric.java

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+package ru.bitheaven.createastrafabric;
+
+import com.simibubi.create.Create;
+import earth.terrarium.ad_astra.common.util.OxygenUtils;
+import io.github.fabricators_of_create.porting_lib.util.EnvExecutor;
+import net.fabricmc.api.ModInitializer;
+import net.minecraft.resources.ResourceLocation;
+import net.minecraft.world.entity.LivingEntity;
+import net.minecraft.world.level.Level;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class CreateAstraFabric implements ModInitializer {
+    public static final String ID = "createastrafabric";
+    public static final String NAME = "Create Astra Fabric";
+    public static final Logger LOGGER = LoggerFactory.getLogger(NAME);
+
+    @Override
+    public void onInitialize() {
+        LOGGER.info("Create addon mod [{}] is loading alongside Create [{}]!", NAME, Create.VERSION);
+        LOGGER.info(EnvExecutor.unsafeRunForDist(
+                () -> () -> "{} is accessing Porting Lib from the client!",
+                () -> () -> "{} is accessing Porting Lib from the server!"
+        ), NAME);
+    }
+
+    public static boolean airQualityActivatesHelmet(LivingEntity entity) {
+        final Level level = entity.level();
+        final boolean air = OxygenUtils.levelHasOxygen(level);
+        return !air || entity.isUnderWater();
+    }
+
+    public static ResourceLocation id(String path) {
+        return new ResourceLocation(ID, path);
+    }
+}

src/main/java/ru/bitheaven/createastrafabric/mixin/DivingHelmetItemMixin.java

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+package ru.bitheaven.createastrafabric.mixin;
+
+import net.minecraft.tags.TagKey;
+import net.minecraft.world.entity.LivingEntity;
+import net.minecraft.world.level.material.Fluid;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Redirect;
+import ru.bitheaven.createastrafabric.CreateAstraFabric;
+import com.simibubi.create.content.equipment.armor.DivingHelmetItem;
+
+@Mixin(DivingHelmetItem.class)
+public abstract class DivingHelmetItemMixin {
+    /**
+     * Activate helmet "if in water or lava" -> "if in water or bad air or lava"
+     */
+    @Redirect(at = @At(value = "INVOKE", target = "Lnet/minecraft/world/entity/LivingEntity;isEyeInFluid(Lnet/minecraft/tags/TagKey;)Z"),
+            method = "breatheUnderwater(Lnet/minecraft/world/entity/LivingEntity;)V")
+    private static boolean redirectBreatheUnderwater(LivingEntity entity, TagKey<Fluid> fluidTagKey) {
+        return entity.isEyeInFluid(fluidTagKey) || CreateAstraFabric.airQualityActivatesHelmet(entity);
+    }
+}

src/main/java/ru/bitheaven/createastrafabric/mixin/EntityOxygenSystemMixin.java

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+package ru.bitheaven.createastrafabric.mixin;
+
+import com.simibubi.create.content.equipment.armor.BacktankUtil;
+import com.simibubi.create.content.equipment.armor.DivingHelmetItem;
+import earth.terrarium.ad_astra.common.entity.system.EntityOxygenSystem;
+import earth.terrarium.ad_astra.common.util.ModUtils;
+import net.minecraft.world.entity.LivingEntity;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Redirect;
+
+@Mixin(EntityOxygenSystem.class)
+public abstract class EntityOxygenSystemMixin {
+    /**
+     * Make air exists if Create Air
+     */
+    @Redirect(at = @At(value = "INVOKE", target = "Learth/terrarium/ad_astra/common/util/ModUtils;armourIsOxygenated(Lnet/minecraft/world/entity/LivingEntity;)Z"),
+            method = "oxygenTick(Lnet/minecraft/world/entity/LivingEntity;Lnet/minecraft/server/level/ServerLevel;)V")
+    private static boolean redirectOxygenTick(LivingEntity entity) {
+        boolean createOxygen = true;
+        createOxygen &= !DivingHelmetItem.getWornItem(entity).isEmpty();
+        createOxygen &= !BacktankUtil.getAllWithAir(entity).isEmpty();
+        return ModUtils.armourIsOxygenated(entity) || createOxygen;
+    }
+}

src/main/java/ru/bitheaven/createastrafabric/mixin/MinecraftMixin.java

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+package ru.bitheaven.createastrafabric.mixin;
+
+import ru.bitheaven.createastrafabric.CreateAstraFabric;
+
+import net.minecraft.client.Minecraft;
+
+import net.minecraft.client.main.GameConfig;
+
+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.CallbackInfo;
+
+@Mixin(Minecraft.class)
+public class MinecraftMixin {
+    @Inject(method = "<init>", at = @At("TAIL"))
+    private void example$init(GameConfig gameConfig, CallbackInfo ci) {
+        CreateAstraFabric.LOGGER.info("Hello from {}", CreateAstraFabric.NAME);
+    }
+}

src/main/java/ru/bitheaven/createastrafabric/mixin/RemainingAirOverlayMixin.java

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+package ru.bitheaven.createastrafabric.mixin;
+
+
+import com.simibubi.create.content.equipment.armor.RemainingAirOverlay;
+import net.minecraft.tags.TagKey;
+import net.minecraft.world.level.material.Fluid;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Redirect;
+import ru.bitheaven.createastrafabric.CreateAstraFabric;
+
+import net.minecraft.client.player.LocalPlayer;
+
+@Mixin(RemainingAirOverlay.class)
+public class RemainingAirOverlayMixin {
+    /**
+     * Activate UI "if in water or lava" -> "if in water or bad air or lava"
+     */
+    @Redirect(at = @At(value = "INVOKE", target = "Lnet/minecraft/client/player/LocalPlayer;isEyeInFluid(Lnet/minecraft/tags/TagKey;)Z"),
+            method = "render(Lnet/minecraft/client/gui/GuiGraphics;II)V")
+    private static boolean redirectRender(LocalPlayer player, TagKey<Fluid> fluidTagKey) {
+        return player.isEyeInFluid(fluidTagKey) || CreateAstraFabric.airQualityActivatesHelmet(player);
+    }
+}

src/main/resources/createastrafabric.mixins.json

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+{
+  "required": true,
+  "minVersion": "0.8",
+  "package": "ru.bitheaven.createastrafabric.mixin",
+  "compatibilityLevel": "JAVA_17",
+  "mixins": [
+    "DivingHelmetItemMixin",
+    "EntityOxygenSystemMixin"
+  ],
+  "client": [
+    "MinecraftMixin",
+    "RemainingAirOverlayMixin"
+  ],
+  "injectors": {
+    "defaultRequire": 1
+  }
+}

src/main/resources/fabric.mod.json

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+{
+  "schemaVersion": 1,
+  "id": "createastrafabric",
+  "version": "${version}",
+  "name": "Create Astra Fabric",
+  "description": "Addon for compatibility Create and Ad Astra",
+  "authors": [
+    "BitHeaven"
+  ],
+  "contact": {
+    "website": "https://bitheaven.ru",
+    "repo": "https://git.bitheaven.ru/bitheaven/create-astra-fabric"
+  },
+  "license": "GPL-3.0",
+  "icon": "assets/createastrafabric/icon.png",
+  "environment": "*",
+  "entrypoints": {
+    "main": [
+      "ru.bitheaven.createastrafabric.CreateAstraFabric"
+    ]
+  },
+  "mixins": [
+    "createastrafabric.mixins.json"
+  ],
+  "depends": {
+    "fabricloader": ">=${fabric_loader_version}",
+    "fabric": "*",
+    "minecraft": "${minecraft_version}",
+    "create": "${create_version}"
+  }
+}