Entity metadata (#37)

* add example generated metadata.rs

* metadata.rs codegen

* add the files

* add comment to top of metadata.rs

* avoid clone

* metadata

* defaults

* defaults

* fix metadata readers and writers

* fix bad bitmasks and ignore some clippy warnings in generated code

* add set_index function to entity metadatas

* applying metadata

3 files changed, 13 insertions, 120 deletions

diff --git a/azalea-core/src/direction.rs b/azalea-core/src/direction.rs
index 6a29cab9..22a19ee0 100644
--- a/azalea-core/src/direction.rs
+++ b/azalea-core/src/direction.rs
@@ -2,14 +2,15 @@ use azalea_buf::McBuf;
 
 use crate::floor_mod;
 
-#[derive(Clone, Copy, Debug, McBuf)]
+#[derive(Clone, Copy, Debug, McBuf, Default)]
 pub enum Direction {
+    #[default]
     Down = 0,
-    Up = 1,
-    North = 2,
-    South = 3,
-    West = 4,
-    East = 5,
+    Up,
+    North,
+    South,
+    West,
+    East,
 }
 
 #[derive(Clone, Copy, Debug)]
diff --git a/azalea-core/src/particle/mod.rs b/azalea-core/src/particle/mod.rs
index 8087de51..44c7c2f5 100644
--- a/azalea-core/src/particle/mod.rs
+++ b/azalea-core/src/particle/mod.rs
@@ -1,15 +1,14 @@
 use crate::{BlockPos, Slot};
-use azalea_buf::{BufReadError, McBuf, McBufReadable, McBufVarReadable, McBufWritable};
-use std::io::{Cursor, Write};
+use azalea_buf::McBuf;
 
-#[derive(Debug, Clone, McBuf)]
+#[derive(Debug, Clone, McBuf, Default)]
 pub struct Particle {
     #[var]
     pub id: i32,
     pub data: ParticleData,
 }
 
-#[derive(Clone, Debug)]
+#[derive(Clone, Debug, McBuf, Default)]
 pub enum ParticleData {
     AmbientEntityEffect,
     AngryVillager,
@@ -32,6 +31,7 @@ pub enum ParticleData {
     EnchantedHit,
     Enchant,
     EndRod,
+    #[default]
     EntityEffect,
     ExplosionEmitter,
     Explosion,
@@ -151,112 +151,3 @@ pub struct VibrationParticle {
     #[var]
     pub ticks: u32,
 }
-
-impl ParticleData {
-    pub fn read_from_particle_id(buf: &mut Cursor<&[u8]>, id: u32) -> Result<Self, BufReadError> {
-        Ok(match id {
-            0 => ParticleData::AmbientEntityEffect,
-            1 => ParticleData::AngryVillager,
-            2 => ParticleData::Block(BlockParticle::read_from(buf)?),
-            3 => ParticleData::BlockMarker(BlockParticle::read_from(buf)?),
-            4 => ParticleData::Bubble,
-            5 => ParticleData::Cloud,
-            6 => ParticleData::Crit,
-            7 => ParticleData::DamageIndicator,
-            8 => ParticleData::DragonBreath,
-            9 => ParticleData::DrippingLava,
-            10 => ParticleData::FallingLava,
-            11 => ParticleData::LandingLava,
-            12 => ParticleData::DrippingWater,
-            13 => ParticleData::FallingWater,
-            14 => ParticleData::Dust(DustParticle::read_from(buf)?),
-            15 => ParticleData::DustColorTransition(DustColorTransitionParticle::read_from(buf)?),
-            16 => ParticleData::Effect,
-            17 => ParticleData::ElderGuardian,
-            18 => ParticleData::EnchantedHit,
-            19 => ParticleData::Enchant,
-            20 => ParticleData::EndRod,
-            21 => ParticleData::EntityEffect,
-            22 => ParticleData::ExplosionEmitter,
-            23 => ParticleData::Explosion,
-            24 => ParticleData::FallingDust(BlockParticle::read_from(buf)?),
-            25 => ParticleData::Firework,
-            26 => ParticleData::Fishing,
-            27 => ParticleData::Flame,
-            28 => ParticleData::SoulFireFlame,
-            29 => ParticleData::Soul,
-            30 => ParticleData::Flash,
-            31 => ParticleData::HappyVillager,
-            32 => ParticleData::Composter,
-            33 => ParticleData::Heart,
-            34 => ParticleData::InstantEffect,
-            35 => ParticleData::Item(ItemParticle::read_from(buf)?),
-            36 => ParticleData::Vibration(VibrationParticle::read_from(buf)?),
-            37 => ParticleData::ItemSlime,
-            38 => ParticleData::ItemSnowball,
-            39 => ParticleData::LargeSmoke,
-            40 => ParticleData::Lava,
-            41 => ParticleData::Mycelium,
-            42 => ParticleData::Note,
-            43 => ParticleData::Poof,
-            44 => ParticleData::Portal,
-            45 => ParticleData::Rain,
-            46 => ParticleData::Smoke,
-            47 => ParticleData::Sneeze,
-            48 => ParticleData::Spit,
-            49 => ParticleData::SquidInk,
-            50 => ParticleData::SweepAttack,
-            51 => ParticleData::TotemOfUndying,
-            52 => ParticleData::Underwater,
-            53 => ParticleData::Splash,
-            54 => ParticleData::Witch,
-            55 => ParticleData::BubblePop,
-            56 => ParticleData::CurrentDown,
-            57 => ParticleData::BubbleColumnUp,
-            58 => ParticleData::Nautilus,
-            59 => ParticleData::Dolphin,
-            60 => ParticleData::CampfireCozySmoke,
-            61 => ParticleData::CampfireSignalSmoke,
-            62 => ParticleData::DrippingHoney,
-            63 => ParticleData::FallingHoney,
-            64 => ParticleData::LandingHoney,
-            65 => ParticleData::FallingNectar,
-            66 => ParticleData::FallingSporeBlossom,
-            67 => ParticleData::Ash,
-            68 => ParticleData::CrimsonSpore,
-            69 => ParticleData::WarpedSpore,
-            70 => ParticleData::SporeBlossomAir,
-            71 => ParticleData::DrippingObsidianTear,
-            72 => ParticleData::FallingObsidianTear,
-            73 => ParticleData::LandingObsidianTear,
-            74 => ParticleData::ReversePortal,
-            75 => ParticleData::WhiteAsh,
-            76 => ParticleData::SmallFlame,
-            77 => ParticleData::Snowflake,
-            78 => ParticleData::DrippingDripstoneLava,
-            79 => ParticleData::FallingDripstoneLava,
-            80 => ParticleData::DrippingDripstoneWater,
-            81 => ParticleData::FallingDripstoneWater,
-            82 => ParticleData::GlowSquidInk,
-            83 => ParticleData::Glow,
-            84 => ParticleData::WaxOn,
-            85 => ParticleData::WaxOff,
-            86 => ParticleData::ElectricSpark,
-            87 => ParticleData::Scrape,
-            _ => return Err(BufReadError::UnexpectedEnumVariant { id: id as i32 }),
-        })
-    }
-}
-
-impl McBufReadable for ParticleData {
-    fn read_from(buf: &mut Cursor<&[u8]>) -> Result<Self, BufReadError> {
-        let id = u32::var_read_from(buf)?;
-        ParticleData::read_from_particle_id(buf, id)
-    }
-}
-
-impl McBufWritable for ParticleData {
-    fn write_into(&self, _buf: &mut impl Write) -> Result<(), std::io::Error> {
-        todo!()
-    }
-}
diff --git a/azalea-core/src/slot.rs b/azalea-core/src/slot.rs
index d60c7390..f1cd4f0b 100644
--- a/azalea-core/src/slot.rs
+++ b/azalea-core/src/slot.rs
@@ -3,8 +3,9 @@
 use azalea_buf::{BufReadError, McBuf, McBufReadable, McBufWritable};
 use std::io::{Cursor, Write};
 
-#[derive(Debug, Clone)]
+#[derive(Debug, Clone, Default)]
 pub enum Slot {
+    #[default]
     Empty,
     Present(SlotData),
 }