Adding a new Inventory tab

[DopplerEffect]

Hi, I hope that someone can give me some advice because I've stared at this for a few hours and I'm not really sure what I'm missing. I would like to add a new tab to the inventory. After reading the documentation and looking at a few other mods it seems to me that all I should need to do is create a mod with a structure like this:

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MyMod_0.0.1
  |- info.json
  |- data.lua
  |- control.lua
  |- prototypes
        | - item-groups.lua

With the contents as follows:
info.json

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{ 
  "name":"MyMod",
  "title":"asdf",
  "version":"0.0.1"
  "homepage":"asdf",
  "author":"DopplerEffect",
  "contact":"example@gmail.com",
  "description":"MyMod description",
  "dependencies":["base >= 0.11.8"],
}

data.lua

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require("prototypes.item-groups")

control.lua is blank

item-groups.lua

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data:extend(
{
  {
    type = "item-group",
    name = "test-group",
    icon = "__base__/graphics/technology/automation.png",
    inventory_order = "f",
    order = "e"
  },
  {
    type = "item-subgroup",
    name = "test-subgroup",
    group = "test-group",
    order = "a"
  }
})

Did I set it up incorrectly? Does an item for that tab have to exist before it would show up in the inventory? Or did I just completely miss something and you can't add new inventory tabs

[FishSandwich]

Do you have a recipe to put there? I'm not entirely sure but it makes sense to me that item groups don't show up if there's no recipe there.

[DopplerEffect]

okay, I've added an item, recipe and entity definition and associated it with test-subgroup. Now the structure is like this

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MyMod_0.0.1
  |- info.json
  |- data.lua
  |- control.lua
  |- prototypes
        | - entity.lua
        | - item-groups.lua
        | - items.lua
        | - recipe.lua

Entity.lua

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data:extend
(
    {    
        {
            type = "assembling-machine",
            name = "electric-boiler",
            icon = "__TestMod__/graphics/icons/electric-boiler.png",
            flags = {"placeable-neutral", "player-creation"},
            minable = {hardness = 0.2, mining_time = 0.5, result = "electric-boiler"},
            max_health = 100,
            corpse = "small-remnants",
            resistances =
            {
                {
                    type = "fire",
                    percent = 80
                }
            },
            collision_box = {{-0.29, -0.29}, {0.29, 0.29}},
            selection_box = {{-0.5, -0.5}, {0.5, 0.5}},
            fast_replaceable_group = "pipe",
            animation =
            {
                filename = "__TestMod__/graphics/entity/boiler/electric-boiler.png",
                priority="high",
                width = 44,
                height = 50,
                frame_count = 1,
                line_length = 1,
            },
            crafting_categories = {"crafting"},
            crafting_speed = 6,
            energy_source =
            {
                type = "electric",
                usage_priority = "secondary-input",
            },
            energy_usage = "700kW",
            ingredient_count = 1,
            fluid_boxes =
            {
                {
                    base_area = 1,
                    pipe_covers = pipecoverspictures(),
                    pipe_connections =
                    {
                        { position = {0, -1} },
                        { position = {0, 1} },
                        { position = {-1, 0} },
                        { position = {1, 0} },
                    },
                }
            }
        }
    }
)

items.lua

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data:extend
(
  {
      {
        type = "item",
        name = "electric-boiler",
        icon = "__TestMod__/graphics/icons/electric-boiler.png",
        flags = {"goes-to-quickbar"},
        subgroup = "test-subgroup",
        order = "a[boiler]-b[electric-boiler]",
        place_result = "electric-boiler",
        stack_size = 50
      }
  }
)

and recipe.lua

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data:extend({
  {
    type = "recipe",
    name = "electric-boiler",
    enabled = "false",
    ingredients = 
    {
        {"steel-plate", 6},
        {"advanced-circuit", 4},
        {"stone-brick", 4}
    },
    result = "electric-boiler"
  }
})

and modifying data.lua to require all the listed files. The item was basically copied from another mod (https://github.com/Kioshi/Factorio-Alphamod) and I still get nothing

[FishSandwich]

Hm, try in the recipe.lua, change enabled = "true".

enabled = "false" means it would need to be researched before it will show in the crafting menu.

Sorry I can't help more, I'm not at my computer right now to test it.

[DopplerEffect]

That was it, thanks a lot

[FishSandwich]

Great No problem.