Update + reformat based on VoxeLibre recommendations

api.lua

@@ -45,38 +45,6 @@ local WIDTH_NAMES = {
 -- Internal table that lets us define functions without directly exposing them.
 local internal = {}
 
--- Add a droplet catcher, which is a node that allows a stalactite spike to
--- change the name using a droplet.
-function internal.register_droplet_catcher(droplet, oldnodename, newnodename)
-	if CAULDRONS[droplet] == nil then
-		internal.uninitialized_droplet_error(droplet)
-	end
-
-	CAULDRONS[droplet][oldnodename] = newnodename
-end
-
-function internal.register_droplet_source(droplet, nodename)
-	if SOURCES[droplet] == nil then
-		internal.uninitialized_droplet_error(droplet)
-	end
-	table.insert(SOURCES[droplet], nodename)
-
-	-- If the node can emit an infinite number of droplets,
-	-- it can also absorb an infinite number of droplets.
-	internal.register_droplet_catcher(droplet, oldnodename, newnodename)
-end
-
--- Add a droplet trickler, which is a dripstone node that allows a droplet to
--- be trickled down from the node directly above it.
--- Running this function overrides previous values.
-function internal.add_droplet_trickler(droplet, oldnodename, newnodename)
-	if TRICKLERS[droplet] == nil then
-		internal.uninitialized_droplet_error(droplet)
-	end
-
-	TRICKLERS[droplet][oldnodename] = newnodename
-end
-
 -- Capitalize a string
 function internal.capitalize(str)
 	return (str:gsub("^%l", string.upper))
@@ -107,11 +75,7 @@ end
 
 -- Determine whether this mod considers a node an air node.
 function internal.is_air(nodename)
-	if nodename == "air" then
+	return (nodename == "air") or (minetest.get_item_group(nodename, "air") ~= 0)
-		return true
-	else
-		return minetest.get_item_group(nodename, "air") ~= 0
-	end
 end
 
 -- Create a node box for any given dripstone size.
@@ -190,7 +154,7 @@ function internal.register_dripstone_flavor(flavor, def)
 	-- Allow dripstone nodes to trickle down droplets
 	for droplet, new_flavor in pairs(on_droplet_receive) do
 		for width = 1, 8, 1 do
-			internal.add_droplet_trickler(
+			internal.register_trickler(
 				droplet,
 				internal.size_to_name(flavor, width),
 				internal.size_to_name(new_flavor, width)
@@ -274,25 +238,29 @@ function internal.register_dripstone_node(flavor, size, tiles, sounds, drop)
 		description = internal.size_to_description(flavor, size),
 		tiles = tiles,
 		groups = {
-			pickaxey=2,
+			pickaxey = 2,
-			material_stone=1,
+			material_stone = 1,
 			fall_damage_add_percent = math.max(4 - size, 0) / 4 * 100
 		},
 		is_ground_content = true,
 		drop = {
 			max_items = math.floor((size + 1) / 2),
 			items = {
-				{ rarity = 1
+				{
-				, items = { drop }
+					rarity = 1,
+					items = { drop },
 				},
-				{ rarity = 2
+				{
-				, items = { drop }
+					rarity = 2,
+					items = { drop },
 				},
-				{ rarity = 4
+				{
-				, items = { drop }
+					rarity = 4,
+					items = { drop },
 				},
-				{ rarity = 4
+				{
-				, items = { drop }
+					rarity = 4,
+					items = { drop },
 				},
 			}
 		},
@@ -357,6 +325,27 @@ function internal.register_droplet(droplet)
 	end
 end
 
+-- Add a droplet catcher, which is a node that allows a stalactite spike to
+-- change the name using a droplet.
+function internal.register_droplet_catcher(droplet, oldnodename, newnodename)
+	if CAULDRONS[droplet] == nil then
+		internal.uninitialized_droplet_error(droplet)
+	end
+
+	CAULDRONS[droplet][oldnodename] = newnodename
+end
+
+function internal.register_droplet_source(droplet, nodename)
+	if SOURCES[droplet] == nil then
+		internal.uninitialized_droplet_error(droplet)
+	end
+	table.insert(SOURCES[droplet], nodename)
+
+	-- If the node can emit an infinite number of droplets,
+	-- it can also absorb an infinite number of droplets.
+	internal.register_droplet_catcher(droplet, nodename, nodename)
+end
+
 function internal.register_grow_abm(oldnodename, newnodename, width)
 	minetest.register_abm({
 		nodenames = { oldnodename },
@@ -400,6 +389,17 @@ function internal.register_trickle_down_abm(droplet, width, old_source, new_sour
 	})
 end
 
+-- Add a droplet trickler, which is a dripstone node that allows a droplet to
+-- be trickled down from the node directly above it.
+-- Running this function overrides previous values.
+function internal.register_trickler(droplet, oldnodename, newnodename)
+	if TRICKLERS[droplet] == nil then
+		internal.uninitialized_droplet_error(droplet)
+	end
+
+	TRICKLERS[droplet][oldnodename] = newnodename
+end
+
 function internal.size_to_description(flavor, size)
 	local width_name = WIDTH_NAMES[size]