I'm trying to make randomly-generated weapons. Everything from their damage, durability, enchantability, repair item, name colour and size. I have it all set up the way I want it but now I need to have it be saved to each individual generated sword. But how do I save those to NBT and read from NBT to set the actual values so already-existing swords don't re-generate upon every load?

Look for

Item

methods that take an

ItemStack

parameter, you can use this to read the values from the NBT.

 

• Attack damage: override

  getAttributeModifiers(ItemStack stack)

  (look at

  ItemSword

  to see how it adds the attack damage modifier)
  

• Durability: override

  getMaxDamage(ItemStack stack)

  
  

• Enchantability: override

  getItemEnchantability(ItemStack stack)

  
  

• Repair item: override

  getIsRepairable(ItemStack p_82789_1_, ItemStack p_82789_2_)

  (the arguments are the items in the left and right slots of the anvil respectively)
  

• Name colour: override

  getRarity(ItemStack p_77613_1_)

  (for one of the default rarity colours) or

  getItemStackDisplayName(ItemStack p_77653_1_)

  (for custom colours using

  EnumChatFormatting

  )
  

• Size: Not entirely sure, but you probably want to implement

  IItemRenderer

  
  

Nevermind this edit, I asked a stupid question here.

You have to do it where you generate your sword. You for sure have an

ItemStack

in there.

How would I write the repair item and the value of EnumChatFormatting to NBT?

How would I write the repair item and the value of EnumChatFormatting to NBT?

ItemStack#writeToNBT

will write an

ItemStack

to an

NBTTagCompound

.

 

You should be able to save the

EnumChatFormatting

as a string (i.e. store the result of the

toString

method).