i3/API.md

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## API
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### Custom tabs
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#### `i3.new_tab(name, def)`
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- `name` is the tab name.
- `def` is the tab definition.
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Custom tabs can be added to the `i3` inventory as follow (example):
```Lua
i3.new_tab("stuff", {
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description = "Stuff",
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image = "image.png", -- Optional, adds an image next to the tab description
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-- Determine if the tab is visible by a player, `false` or `nil` hide the tab
access = function(player, data)
local name = player:get_player_name()
if name == "singleplayer" then
return false
end
end,
formspec = function(player, data, fs)
fs("label[3,1;This is just a test]")
end,
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-- Events handling happens here
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fields = function(player, data, fields)
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end,
})
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```
- `player` is an `ObjectRef` to the user.
- `data` are the user data.
- `fs` is the formspec table which is callable with a metamethod. Each call adds a new entry.
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#### `i3.set_fs(player)`
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Updates the current formspec.
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#### `i3.remove_tab(tabname)`
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Deletes a tab by name.
#### `i3.get_current_tab(player)`
Returns the current player tab. `player` is an `ObjectRef` to the user.
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#### `i3.set_tab(player[, tabname])`
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Sets the current tab by name. `player` is an `ObjectRef` to the user.
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`tabname` can be omitted to get an empty tab.
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#### `i3.override_tab(tabname, def)`
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Overrides a tab by name. `def` is the tab definition like seen in `i3.set_tab`.
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#### `i3.tabs`
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A list of registered tabs.
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---
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### Custom recipes
Custom recipes are nonconventional crafts outside the main crafting grid.
They can be registered in-game dynamically and have a size beyond 3x3 items.
**Note:** the registration format differs from the default registration format in everything.
The width is automatically calculated depending where you place the commas. Look at the examples attentively.
#### Registering a custom crafting type (example)
```Lua
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i3.register_craft_type("digging", {
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description = "Digging",
icon = "default_tool_steelpick.png",
})
```
#### Registering a custom crafting recipe (examples)
```Lua
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i3.register_craft {
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type = "digging",
result = "default:cobble 2",
items = {"default:stone"},
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}
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```
```Lua
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i3.register_craft {
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result = "default:cobble 16",
items = {
"default:stone, default:stone, default:stone",
"default:stone, , default:stone",
"default:stone, default:stone, default:stone",
}
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}
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```
Recipes can be registered in a Minecraft-like way:
```Lua
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i3.register_craft {
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grid = {
"X #",
" ## ",
"X#X#",
"X X",
},
key = {
['#'] = "default:wood",
['X'] = "default:glass",
},
result = "default:mese 3",
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}
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```
Multiples recipes can also be registered:
```Lua
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i3.register_craft {
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{
result = "default:mese",
items = {
"default:mese_crystal, default:mese_crystal",
"default:mese_crystal, default:mese_crystal",
}
},
big = {
result = "default:mese 4",
items = {
"default:mese_crystal, default:mese_crystal",
"default:mese_crystal, default:mese_crystal",
"default:mese_crystal, default:mese_crystal",
"default:mese_crystal, default:mese_crystal",
}
},
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}
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```
Recipes can be registered from a given URL containing a JSON file (HTTP support is required¹):
```Lua
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i3.register_craft {
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url = "https://raw.githubusercontent.com/minetest-mods/i3/main/tests/test_online_recipe.json"
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}
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```
---
### Recipe filters
Recipe filters can be used to filter the recipes shown to players. Progressive
mode is implemented as a recipe filter.
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#### `i3.add_recipe_filter(name, function(recipes, player))`
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Adds a recipe filter with the given `name`. The filter function returns the
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recipes to be displayed, given the available recipes and an `ObjectRef` to the
user. Each recipe is a table of the form returned by
`minetest.get_craft_recipe`.
Example function to hide recipes for items from a mod called "secretstuff":
```lua
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i3.add_recipe_filter("Hide secretstuff", function(recipes)
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local filtered = {}
for _, recipe in ipairs(recipes) do
if recipe.output:sub(1,12) ~= "secretstuff:" then
filtered[#filtered + 1] = recipe
end
end
return filtered
end)
```
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#### `i3.set_recipe_filter(name, function(recipe, player))`
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Removes all recipe filters and adds a new one.
#### `i3.recipe_filters`
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A map of recipe filters, indexed by name.
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---
### Search filters
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Search filters are used to perform specific searches from the search field.
The filters can be cumulated to perform a specific search.
They are used like so: `<optional_name> +<filter name>=<value1>,<value2>,<...>`
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Example usages:
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- `+groups=cracky,crumbly` -> search for groups `cracky` and `crumbly` in all items.
- `wood +groups=flammable` -> search for group `flammable` amongst items which contain
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`wood` in their names.
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Notes:
- If `optional_name` is omitted, the search filter will apply to all items, without pre-filtering.
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- The `+groups` filter is currently implemented by default.
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#### `i3.add_search_filter(name, function(item, values))`
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Adds a search filter.
The search function must return a boolean value (whether the given item should be listed or not).
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- `name` is the filter name.
- `values` is a table of all possible values.
Example function sorting items by drawtype:
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```lua
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i3.add_search_filter("types", function(item, drawtypes)
local t = {}
for i, dt in ipairs(drawtypes) do
t[i] = (dt == "node" and reg_nodes[item] and 1) or
(dt == "item" and reg_craftitems[item] and 1) or
(dt == "tool" and reg_tools[item] and 1) or nil
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end
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return #t > 0
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end)
```
#### `i3.search_filters`
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A map of search filters, indexed by name.
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---
### Sorting methods
Sorting methods are used to filter the player's main inventory.
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#### `i3.add_sorting_method(name, def)`
Adds a player inventory sorting method.
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- `name` is the method name.
- `def` is the method definition.
Example:
```Lua
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i3.add_sorting_method("test", {
description = "Cool sorting method",
func = function(list, data)
-- `list`: inventory list
-- `data`: player data
table.sort(list)
-- A list must be returned
return list
end,
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})
```
#### `i3.sorting_methods`
A table containing all sorting methods.
---
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### Item list compression
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`i3` can reduce the item list size by compressing a group of items.
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#### `i3.compress(item, def)`
Adds a new group of items to compress.
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- `item` is the item which represent the group of compressed items.
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- `def` is a table specifying the substring replace patterns to be used.
Example:
```Lua
i3.compress("default:diamondblock", {
replace = "diamond",
by = {"bronze", "copper", "gold", "steel", "tin"}
})
```
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#### `i3.compress_groups`
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A map of all compressed item groups, indexed by stereotypes.
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---
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### Miscellaneous
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#### `i3.hud_notif(name, msg[, img])`
Shows a Steam-like HUD notification on the bottom-right corner of the screen (experimental).
- `name` is the player name.
- `msg` is the HUD message to show.
- `img` (optional) is the HUD image to show (preferably 16x16 px).
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#### `i3.get_recipes(item)`
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Returns a table of recipes and usages of `item`.
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#### `i3.export_url`
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If set, the mod will export all the cached recipes and usages in a JSON format
to the given URL (HTTP support is required¹).
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#### `groups = {bag = <1-4>}`
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The `bag` group in the item definition allows to extend the player inventory size
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given a number between 1 and 4.
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---
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**¹** Add `i3` to the `secure.http_mods` or `secure.trusted_mods` setting in `minetest.conf`.