areas/api.md

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Areas mod API
===
API list
---
* `areas:registerHudHandler(handler)` - Registers a handler to add items to the Areas HUD. See [HUD](#hud).
* `areas:registerProtectionCondition(func(pos1, pos2, name))` -
See [Protection Conditions](#Protection-Conditions)
* `areas:registerOnAdd(func(id, area))`
* `areas:registerOnRemove(func(id))`
* `areas:registerOnMove(func(id, area, pos1, pos2))`
Protection Conditions
---
With `areas:registerProtectionCondition(func(pos1, pos2, name))`
you can register rules to control whether to allow or prohibit the creation of an area.
Return values:
* `true` Forcefully allows the area creation. This overwrites the outcome of any
previously executed conditions, including the default ones registered by this mod.
* `false, errMsg` Disable the creation of the area and return an error message.
* `nil` (or no return value) Enable the creation of the area,
unless specified otherwise by the other registered callbacks.
HUD
---
If you are making a protection mod or a similar mod that adds invisible regions
to the world, and you would like then to show up in the areas HUD element, you
can register a callback to show your areas.
HUD handler specification:
* `handler(pos, list)`
* `pos` - The position to check.
* `list` - The list of area HUD elements, this should be modified in-place.
The area list item is a table containing a list of tables with the following fields:
* `id` - An identifier for the area. This should be a unique string in the format `mod:id`.
* `name` - The name of the area.
* `owner` - The player name of the region owner, if any.
All of the fields are optional but at least one of them must be set.
### Example
local function areas_hud_handler(pos, areas)
local val = find_my_protection(pos)
if val then
table.insert(areas, {
id = "mod:"..val.id,
name = val.name,
owner = val.owner,
})
end
end
areas:registerHudHandler(areas_hud_handler)