Initial working proof of concept

.cdbrelease.lua

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+-- LUALOCALS < ---------------------------------------------------------
+local math, tonumber
+    = math, tonumber
+local math_floor
+    = math.floor
+-- LUALOCALS > ---------------------------------------------------------
+
+local stamp = tonumber("$Format:%at$")
+if not stamp then return end
+stamp = math_floor((stamp - 1540612800) / 60)
+stamp = ("00000000" .. stamp):sub(-8)
+
+-- luacheck: push
+-- luacheck: globals config readtext readbinary
+
+readtext = readtext or function() end
+readbinary = readbinary or function() end
+
+return {
+	user = "Warr1024",
+	pkg = "nc_ad_removal",
+	version = stamp .. "-$Format:%h$",
+	type = "mod",
+	dev_state = "ACTIVELY_DEVELOPED",
+	title = "Ad Removal for NodeCore",
+	short_description = "Removes all ads from NodeCore",
+	tags = {"gui", "hud", "singleplayer"},
+	license = "MIT",
+	media_license = "MIT",
+	repo = "https://gitlab.com/sztest/nc_ad_removal",
+	issue_tracker = "https://discord.gg/NNYeF6f",
+	long_description = readtext('README.md')
+}
+
+-- luacheck: pop

.gitattributes

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+.cdbrelease.lua	export-subst
+.cdb.json	export-ignore
+.cdb-*		export-ignore
+.git*		export-ignore
+.lua*		export-ignore
+docs		export-ignore
+src		export-ignore
+TODO		export-ignore

.luacheckrc

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+globals = {"minetest", "ItemStack", "VoxelArea", "vector", "nodecore", "include", "SecureRandom"}
+color = false
+quiet = 1

.lualocals

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+~print
+minetest
+ItemStack
+VoxelArea
+vector
+nodecore
+include
+SecureRandom

README.md

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+This mod removes every ad from NodeCore.
+
+**N.B.** this mod only works (correctly) in English, and will likely break translations.  It is not recommended on multiplayer servers.

init.lua

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+-- LUALOCALS < ---------------------------------------------------------
+local nodecore, string
+    = nodecore, string
+local string_gsub, string_upper
+    = string.gsub, string.upper
+-- LUALOCALS > ---------------------------------------------------------
+
+local function adremove(s)
+	s = string_gsub(s, "Ad(%w)", string_upper)
+	return string_gsub(s, "[Aa][Dd]", "")
+end
+
+nodecore.register_on_register_item({
+		func = function(_, def)
+			if not def.description then return end
+			def.description = adremove(def.description)
+		end,
+		retroactive = true
+	})

mod.conf

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+name = nc_ad_removal
+depends = nc_api_all