code consistency

crops/cotton.lua

@@ -187,14 +187,17 @@ farming.register_plant("farming:cotton", {
 })]]
 
 -- mapgen
-local grow_on = farming.mapgen == "v6" and {"default:dirt_with_grass"}
-		or {"default:dry_dirt_with_dry_grass"}
-local biome = farming.mapgen == "v6" and {"jungle"} or {"savanna"}
+local mg = farming.mapgen == "v6"
+
+def = {
+	grow_on = mg and {"default:dirt_with_grass"} or {"default:dry_dirt_with_dry_grass"},
+	biome = mg and {"jungle"} or {"savanna"}
+}
 
 minetest.register_decoration({
 	name = "farming:cotton_wild",
 	deco_type = "simple",
-	place_on = grow_on,
+	place_on = def.grow_on,
 	sidelen = 16,
 	noise_params = {
 		offset = -0.1,
@@ -204,7 +207,7 @@ minetest.register_decoration({
 		octaves = 3,
 		persist = 0.7
 	},
-	biomes = biome,
+	biomes = def.biome,
 	y_max = 31000,
 	y_min = 1,
 	decoration = "farming:cotton_wild"

crops/pepper.lua

@@ -156,12 +156,15 @@ farming.registered_plants["farming:pepper"] = {
 }
 
 -- mapgen
-local grow_on = farming.mapgen == "v6" and {"default:dirt_with_grass"}
-		or {"default:dirt_with_rainforest_litter"}
+local mg = farming.mapgen == "v6"
+
+def = {
+	grow_on = mg and {"default:dirt_with_grass"} or {"default:dirt_with_rainforest_litter"}
+}
 
 minetest.register_decoration({
 	deco_type = "simple",
-	place_on = grow_on,
+	place_on = def.grow_on,
 	sidelen = 16,
 	noise_params = {
 		offset = 0,

crops/pineapple.lua

@@ -142,14 +142,18 @@ farming.registered_plants["farming:pineapple"] = {
 }
 
 -- mapgen
-local grow_on = farming.mapgen == "v6" and {"default:dirt_with_grass"}
-		or {"default:dirt_with_dry_grass", "default:dry_dirt_with_dry_grass"}
-local grow_near = farming.mapgen == "v6" and "default:desert_sand" or nil
-local num = farming.mapgen == "v6" and 1 or -1
+local mg = farming.mapgen == "v6"
+
+def = {
+	grow_on = mg and {"default:dirt_with_grass"} or {"default:dirt_with_dry_grass",
+			"default:dry_dirt_with_dry_grass"},
+	grow_near = mg and "default:desert_sand" or nil,
+	num = mg and 1 or -1
+}
 
 minetest.register_decoration({
 	deco_type = "simple",
-	place_on = grow_on,
+	place_on = def.grow_on,
 	sidelen = 16,
 	noise_params = {
 		offset = 0,
@@ -162,6 +166,6 @@ minetest.register_decoration({
 	y_min = 18,
 	y_max = 30,
 	decoration = {"farming:pineapple_8"},
-	spawn_by = grow_near,
-	num_spawn_by = num
+	spawn_by = def.grow_near,
+	num_spawn_by = def.num
 })