Stop polluting global namespace

ferns/fern.lua

@@ -127,7 +127,10 @@ plantslib:spawn_on_surfaces({
 	},
 	seed_diff = 329,
 })]]
-if Ferns_near_Tree == true then
+
+assert(abstract_ferns.config.Lady_fern == true)
+
+if abstract_ferns.config.Ferns_near_Tree == true then
 	plantslib:register_generate_plant({ -- near trees (woodlands)
 		surface = {
 			"default:dirt_with_grass",
@@ -155,7 +158,7 @@ plantslib:register_generate_plant({ -- near trees (woodlands)
 	)
 end
 
-if Ferns_near_Rock == true then
+if abstract_ferns.config.Ferns_near_Rock == true then
 	plantslib:register_generate_plant({ -- near stone (mountains)
 		surface = {
 			"default:dirt_with_grass",
@@ -181,7 +184,7 @@ plantslib:register_generate_plant({ -- near stone (mountains)
 	)
 end
 
-if Ferns_near_Ores == true then -- this one causes a huge fps drop
+if abstract_ferns.config.Ferns_near_Ores == true then -- this one causes a huge fps drop
 	plantslib:register_generate_plant({ -- near ores (potential mining sites)
 		surface = {
 			"default:dirt_with_grass",
@@ -218,7 +221,7 @@ plantslib:register_generate_plant({ -- near ores (potential mining sites)
 	)
 end
 
-if Ferns_in_Groups == true then -- this one is meant as a replacement of Ferns_near_Ores
+if abstract_ferns.config.Ferns_in_Groups == true then -- this one is meant as a replacement of Ferns_near_Ores
 	plantslib:register_generate_plant({
 		surface = {
 			"default:dirt_with_grass",

ferns/gianttreefern.lua

@@ -276,8 +276,11 @@ minetest.register_abm({
 -----------------------------------------------------------------------------------------------
 -- GENERATE GIANT TREE FERN
 -----------------------------------------------------------------------------------------------
+
+assert(abstract_ferns.config.Giant_Tree_Fern == true)
+
 -- in jungles
-if Giant_Tree_Ferns_in_Jungle == true then
+if abstract_ferns.config.Giant_Tree_Ferns_in_Jungle == true then
 	plantslib:register_generate_plant({
 		surface = {
 			"default:dirt_with_grass",
@@ -306,7 +309,7 @@ plantslib:register_generate_plant({
 end
 
 -- for oases & tropical beaches
-if Giant_Tree_Ferns_for_Oases == true then
+if abstract_ferns.config.Giant_Tree_Ferns_for_Oases == true then
 	plantslib:register_generate_plant({
 		surface = {
 			"default:sand"--,

ferns/horsetail.lua

@@ -94,7 +94,7 @@ minetest.register_node("ferns:horsetail_04", { -- the one in inventory
 -----------------------------------------------------------------------------------------------
 -- Spawning
 -----------------------------------------------------------------------------------------------
-if Horsetails_Spawning == true then
+if abstract_ferns.config.Horsetails_Spawning == true then
 	plantslib:spawn_on_surfaces({
 		spawn_delay = 1200,
 		spawn_plants = {
@@ -124,7 +124,10 @@ end
 -----------------------------------------------------------------------------------------------
 -- Generating
 -----------------------------------------------------------------------------------------------
-if Horsetails_on_Grass == true then
+
+assert(abstract_ferns.config.Horsetails == true)
+
+if abstract_ferns.config.Horsetails_on_Grass == true then
 	plantslib:register_generate_plant({
 		surface = {
 			"default:dirt_with_grass",
@@ -155,7 +158,7 @@ plantslib:register_generate_plant({
 	)
 end
 
-if Horsetails_on_Stony == true then
+if abstract_ferns.config.Horsetails_on_Stony == true then
 	plantslib:register_generate_plant({
 		surface = {
 			"default:gravel", -- roots go deep

ferns/init.lua

@@ -10,19 +10,19 @@ abstract_ferns = {}
 
 dofile(minetest.get_modpath("ferns").."/settings.lua")
 
-if Lady_fern == true then
+if abstract_ferns.config.Lady_fern == true then
 	dofile(minetest.get_modpath("ferns").."/fern.lua")
 end
 
-if Horsetails == true then
+if abstract_ferns.Horsetails == true then
 	dofile(minetest.get_modpath("ferns").."/horsetail.lua")
 end
 
-if Tree_Fern == true then
+if abstract_ferns.config.Tree_Fern == true then
 	dofile(minetest.get_modpath("ferns").."/treefern.lua")
 end
 
-if Giant_Tree_Fern == true then
+if abstract_ferns.config.Giant_Tree_Fern == true then
 	dofile(minetest.get_modpath("ferns").."/gianttreefern.lua")
 end
 

ferns/settings.lua

@@ -13,30 +13,31 @@
 
 -- If something is still unclear, don't hesitate to post your question @ https://forum.minetest.net/viewtopic.php?id=6921
 
+abstract_ferns.config = {}
 
 -- Which plants should generate/spawn?
-Lady_fern		= true
-Horsetails 		= true
-Tree_Fern 		= true
-Giant_Tree_Fern = true
+abstract_ferns.config.Lady_fern			= true
+abstract_ferns.config.Horsetails 		= true
+abstract_ferns.config.Tree_Fern 		= true
+abstract_ferns.config.Giant_Tree_Fern 	= true
 
 -- Where should they generate/spawn? (if they generate/spawn)
 --
 --  Lady-Fern
-Ferns_near_Tree = true				
-Ferns_near_Rock = true				
-Ferns_near_Ores = true				-- if there's a bunch of ferns there's ores nearby, this one causes a huge fps drop
-Ferns_in_Groups = false				-- this one is meant as a replacement of Ferns_near_Ores: ferns tend to generate in groups, less fps drop, no hint for nearby ores
+abstract_ferns.config.Ferns_near_Tree = true
+abstract_ferns.config.Ferns_near_Rock = true
+abstract_ferns.config.Ferns_near_Ores = true				-- if there's a bunch of ferns there's ores nearby, this one causes a huge fps drop
+abstract_ferns.config.Ferns_in_Groups = false				-- this one is meant as a replacement of Ferns_near_Ores: ferns tend to generate in groups, less fps drop, no hint for nearby ores
 --
 --	Horsetails
-Horsetails_Spawning = false			-- horsetails will grow in already explored areas, over time, near water or gravel
-Horsetails_on_Grass = true			-- on dirt with grass and swamp (sumpf mod)
-Horsetails_on_Stony = true			-- on gravel, mossy cobble and silex (stoneage mod)
+abstract_ferns.config.Horsetails_Spawning = false			-- horsetails will grow in already explored areas, over time, near water or gravel
+abstract_ferns.config.Horsetails_on_Grass = true			-- on dirt with grass and swamp (sumpf mod)
+abstract_ferns.config.Horsetails_on_Stony = true			-- on gravel, mossy cobble and silex (stoneage mod)
 --
 -- Tree_Fern
-Tree_Ferns_in_Jungle = true			
-Tree_Ferns_for_Oases = true			-- for oases and tropical beaches
+abstract_ferns.config.Tree_Ferns_in_Jungle = true
+abstract_ferns.config.Tree_Ferns_for_Oases = true			-- for oases and tropical beaches
 --
 -- Giant_Tree_Fern
-Giant_Tree_Ferns_in_Jungle = true	
-Giant_Tree_Ferns_for_Oases = true	-- for oases and tropical beaches
+abstract_ferns.config.Giant_Tree_Ferns_in_Jungle = true
+abstract_ferns.config.Giant_Tree_Ferns_for_Oases = true		-- for oases and tropical beaches

ferns/treefern.lua

@@ -188,8 +188,11 @@ minetest.register_abm({
 -----------------------------------------------------------------------------------------------
 -- GENERATE TREE FERN
 -----------------------------------------------------------------------------------------------
+
+assert(abstract_ferns.config.Tree_Fern == true)
+
 -- in jungles
-if Tree_Ferns_in_Jungle == true	then
+if abstract_ferns.config.Tree_Ferns_in_Jungle == true then
 	plantslib:register_generate_plant({
 		surface = {
 			"default:dirt_with_grass",
@@ -218,7 +221,7 @@ plantslib:register_generate_plant({
 end
 
 -- for oases & tropical beaches
-if Tree_Ferns_for_Oases == true then
+if abstract_ferns.config.Tree_Ferns_for_Oases == true then
 	plantslib:register_generate_plant({
 		surface = {
 			"default:sand"--,