onEvent('rei.group', event => {
// This event allows you to add custom entry groups to REI, which can be used to clean up the entry list significantly.
// As a simple example, we can add a 'Swords' group which will contain all (vanilla) swords
// Note that each group will need an id (ResourceLocation) and a display name (Component / String)
event.groupItems('kubejs:rei_groups/swords', 'Swords', [
'minecraft:wooden_sword',
'minecraft:stone_sword',
'minecraft:iron_sword',
'minecraft:diamond_sword',
'minecraft:golden_sword',
'minecraft:netherite_sword'
])
// An easy use case for grouping stuff together could be using tags:
// In this case, we want all the Hanging Signs and Sign Posts from Supplementaries to be grouped together
event.groupItemsByTag('supplementaries:rei_groups/hanging_signs', 'Hanging Signs', 'supplementaries:hanging_signs')
event.groupItemsByTag('supplementaries:rei_groups/sign_posts', 'Sign Posts', 'supplementaries:sign_posts')
// Another example: We want all of these items to be grouped together ignoring NBT,
// so you don't have a bajillion potions and enchanted books cluttering up REI anymore
const useNbt = ['potion', 'enchanted_book', 'splash_potion', 'tipped_arrow', 'lingering_potion']
useNbt.forEach(id => {
const item = Item.of(id)
const { namespace, path } = Utils.id(item.id)
event.groupSameItem(`kubejs:rei_groups/${namespace}/${path}`, item.name, item)
})
// Items can also be grouped using anything that can be expressed as an IngredientJS,
// including for example regular expressions or lists of ingredients
event.groupItems('kubejs:rei_groups/spawn_eggs', 'Spawn Eggs', [
/spawn_egg/,
/^ars_nouveau:.*_se$/,
'supplementaries:red_merchant_spawn_egg'
])
// you can even use custom predicates for grouping, like so:
event.groupItemsIf('kubejs:rei_groups/looting_stuff', 'Stuff with Looting I', item =>
// this would group together all items that have the Looting I enchantment on them
item.hasEnchantment('minecraft:looting', 1)
)
// you can also group fluids in much the same way as you can group items, for instance:
event.groupFluidsByTag('kubejs:rei_groups/fluid_tagged_as_water', '\'Water\' (yeah right lmao)', 'minecraft:water')
})