Add function to query stronghold positions

mods/MAPGEN/mcl_strongholds/API.md

@@ -0,0 +1,17 @@
+# Strongholds API
+The API provides one function:
+
+## `mcl_strongholds.get_stronghold_positions()`
+Returns a table of the positions of all strongholds, centered at the end portal room.
+This includes strongholds which have not been generated yet.
+This table is a copy, changes to the table will have no effect on the stronghold generation.
+
+Format of the returned table:
+{
+	{ pos = <position>, generated = <true/false> }, -- first stronghold
+	{ pos = <position>, generated = <true/false> }, -- second stronghold
+	-- and so on …
+}
+
+* pos: Position of stronghold, centered at the end portal room
+* generated: `true` if this stronghold has already been generated

mods/MAPGEN/mcl_strongholds/init.lua

@@ -52,7 +52,7 @@ local init_strongholds = function()
 			end
 			local pos = { x = math.cos(angle) * dist, y = y, z = math.sin(angle) * dist }
 			pos = vector.round(pos)
-			table.insert(strongholds, { pos = pos })
+			table.insert(strongholds, { pos = pos, generated = false })
 
 			-- Rotate angle by (360 / amount) degrees.
 			-- This will cause the angles to be evenly distributed in the stronghold ring
@@ -90,6 +90,12 @@ local generate_strongholds = function(minp, maxp)
 	end
 end
 
+-- Minimal API
+mcl_strongholds = {}
+mcl_strongholds.get_stronghold_positions = function()
+	return table.copy(strongholds)
+end
+
 
 init_strongholds()