split mine gas out into a separate mod

mine_gas/LICENSE.txt

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+Sounds and textures are under various licenses, see the license.txt file in the /sounds and /textures directories for details.
+
+License for Code
+----------------
+
+Copyright (C) 2018 FaceDeer
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

mine_gas/depends.txt

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+default
+tnt?
+doc?

mine_gas/init.lua

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+local MP = minetest.get_modpath(minetest.get_current_modname())
+local S, NS = dofile(MP.."/intllib.lua")
+
+local gas_desc
+local gas_usage
+
+local seep_desc
+local seep_usage
+
+if minetest.get_modpath("doc") then
+	gas_desc = S("Gaseous hydrocarbons formed from the detritus of long dead plants and animals processed by heat and pressure deep within the earth.")
+	gas_usage = S("Gas is highly hazardous. Heavier than air, it pools in deep caverns and asphyxiates the unwary.")
+	if minetest.get_modpath("tnt") then
+		gas_usage = gas_usage .. " " .. S("When exposed to air and an ignition source it can produce a deadly explosion.")
+	end
+	
+	seep_desc = S("Some coal deposits have cracks that seep a steady flow of mine gas.")
+	seep_usage = S("Mining out such a deposit seals the crack.")
+end
+
+
+minetest.register_alias("oil:gas", "mine_gas:gas")
+minetest.register_alias("oil:gas_seep", "mine_gas:gas_seep")
+
+minetest.register_node("mine_gas:gas", {
+	description = S("Mine Gas"),
+	_doc_items_longdesc = gas_desc,
+	_doc_items_usagehelp = gas_usage,
+	walkable = false,
+	pointable = false,
+	diggable = false,
+	buildable_to = true,
+	drawtype = "glasslike",
+	drowning = 1,
+	post_effect_color = {a = 20, r = 20, g = 20, b = 250},
+	tiles = {"mine_gas.png^[opacity:28"},
+	use_texture_alpha = true,
+	groups = {not_in_creative_inventory=1, ropes_can_extend_into=1},
+	paramtype = "light",
+	drop = {},
+	sunlight_propagates = true,
+	--on_blast = function() end, -- unaffected by explosions
+})
+
+minetest.register_node("mine_gas:gas_seep", {
+	description = S("Gas Seep"),
+	_doc_items_longdesc = seep_desc,
+	_doc_items_usagehelp = seep_usage,
+	tiles = {"default_stone.png^default_mineral_coal.png^[combine:16x80:0,-16=crack_anylength.png"},
+	groups = {cracky = 3},
+	drop = 'default:coal_lump',
+	sounds = default.node_sound_stone_defaults(),
+	is_ground_content = true,
+})
+
+minetest.register_on_dignode(function(pos, oldnode, digger)
+	if minetest.get_item_group(oldnode.name, "digtron") > 0 then
+		-- skip digtron moved nodes
+		return;
+	end
+
+	local np = minetest.find_node_near(pos, 1,{"mine_gas:gas"})
+	if np ~= nil then
+		minetest.set_node(pos, {name = "mine_gas:gas"})
+		return
+	end
+end)
+
+local directions = {
+	{x=1, y=0, z=0},
+	{x=-1, y=0, z=0},
+	{x=0, y=0, z=1},
+	{x=0, y=0, z=-1},
+}
+
+local gas_node = {name="mine_gas:gas"}
+minetest.register_abm({
+    label = "mine_gas:gas movement",
+    nodenames = {"mine_gas:gas"},
+    neighbors = {"group:liquid", "air"},
+    interval = 1.0,
+    chance = 1,
+    catch_up = true,
+    action = function(pos, node)
+		local next_pos = {x=pos.x, y=pos.y+1, z=pos.z}
+		local next_node = minetest.get_node(next_pos)
+		if minetest.get_item_group(next_node.name, "liquid") > 0 then
+			minetest.swap_node(next_pos, gas_node)
+			minetest.swap_node(pos, next_node)
+		else
+			next_pos.y = pos.y-1
+			next_node = minetest.get_node(next_pos)
+			if next_node.name == "air" then
+				minetest.swap_node(next_pos, gas_node)
+				minetest.swap_node(pos, next_node)			
+			else
+				local dir = directions[math.random(1,4)]
+				local next_pos = vector.add(pos, dir)
+				local next_node = minetest.get_node(next_pos)
+				if next_node.name == "air" or  minetest.get_item_group(next_node.name, "liquid") > 0 then
+					if next_node.name == "air" or math.random() < 0.5 then -- gas never "climbs" above air.
+						minetest.swap_node(next_pos, gas_node)
+						minetest.swap_node(pos, next_node)
+					else
+						-- this can get gas to rise up out of the surface of liquid, preventing it from forming a permanent hole.
+						next_pos.y = next_pos.y + 1
+						next_node = minetest.get_node(next_pos)
+						if next_node.name == "air" then
+							minetest.swap_node(next_pos, gas_node)
+							minetest.swap_node(pos, next_node)
+						end
+					end
+				end
+			end
+		end
+	end,
+})
+
+minetest.register_abm({
+	label = "mine_gas:gas snuffing torches",
+	nodenames = {"group:torch"},
+	neighbors = {"mine_gas:gas"},
+	interval = 1.0,
+	chance = 1,
+	catch_up = true,
+	action = function(pos, node)
+		if not minetest.find_node_near(pos, 1, "air") then
+			local torch_node = minetest.get_node(pos)
+			local drops = minetest.get_node_drops(torch_node.name, "")
+			for _, dropped_item in pairs(drops) do
+				minetest.add_item(pos, dropped_item)
+	        end
+			minetest.set_node(pos, {name="mine_gas:gas"})
+			minetest.sound_play(
+				"default_cool_lava",
+				{pos = pos, max_hear_distance = 16, gain = 0.1}
+			)
+		end	
+	end,
+})
+
+if minetest.get_modpath("tnt") then
+	minetest.register_abm({
+		label = "mine_gas:gas ignition",
+		nodenames = {"group:torch", "group:igniter"},
+		neighbors = {"mine_gas:gas"},
+		interval = 1.0,
+		chance = 1,
+		catch_up = true,
+		action = function(pos, node)
+			if minetest.find_node_near(pos, 1, "air") then
+				tnt.boom(pos, {radius=1, damage_radius=6})
+			end	
+		end,
+	})
+end
+
+local orthogonal = {
+	{x=0,y=0,z=1},
+	{x=0,y=1,z=0},
+	{x=1,y=0,z=0},
+	{x=0,y=0,z=-1},
+	{x=0,y=-1,z=0},
+	{x=-1,y=0,z=0},
+}
+
+minetest.register_abm({
+	label = "mine_gas:gas seep",
+	nodenames = {"mine_gas:gas_seep"},
+	neighbors = {"air"},
+	interval = 1.0,
+	chance = 1,
+	catch_up = true,
+	action = function(pos, node)
+		local target_pos = vector.add(pos,orthogonal[math.random(1,6)])
+		if minetest.get_node(target_pos).name == "air" then
+			minetest.swap_node(target_pos, {name="mine_gas:gas"})
+			if math.random() < 0.5 then
+				minetest.sound_play(
+					"mine_gas_seep_hiss",
+					{pos = pos, max_hear_distance = 8, gain = 0.05}
+				)
+			end
+		end	
+	end,
+})

mine_gas/intllib.lua

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+
+-- Fallback functions for when `intllib` is not installed.
+-- Code released under Unlicense <http://unlicense.org>.
+
+-- Get the latest version of this file at:
+--   https://raw.githubusercontent.com/minetest-mods/intllib/master/lib/intllib.lua
+
+local function format(str, ...)
+	local args = { ... }
+	local function repl(escape, open, num, close)
+		if escape == "" then
+			local replacement = tostring(args[tonumber(num)])
+			if open == "" then
+				replacement = replacement..close
+			end
+			return replacement
+		else
+			return "@"..open..num..close
+		end
+	end
+	return (str:gsub("(@?)@(%(?)(%d+)(%)?)", repl))
+end
+
+local gettext, ngettext
+if minetest.get_modpath("intllib") then
+	if intllib.make_gettext_pair then
+		-- New method using gettext.
+		gettext, ngettext = intllib.make_gettext_pair()
+	else
+		-- Old method using text files.
+		gettext = intllib.Getter()
+	end
+end
+
+-- Fill in missing functions.
+
+gettext = gettext or function(msgid, ...)
+	return format(msgid, ...)
+end
+
+ngettext = ngettext or function(msgid, msgid_plural, n, ...)
+	return format(n==1 and msgid or msgid_plural, ...)
+end
+
+return gettext, ngettext

mine_gas/locale/template.pot

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+# SOME DESCRIPTIVE TITLE.
+# Copyright (C) YEAR THE PACKAGE'S COPYRIGHT HOLDER
+# This file is distributed under the same license as the PACKAGE package.
+# FIRST AUTHOR <EMAIL@ADDRESS>, YEAR.
+#
+#, fuzzy
+msgid ""
+msgstr ""
+"Project-Id-Version: PACKAGE VERSION\n"
+"Report-Msgid-Bugs-To: \n"
+"POT-Creation-Date: 2019-03-26 00:49-0600\n"
+"PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
+"Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
+"Language-Team: LANGUAGE <LL@li.org>\n"
+"Language: \n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=CHARSET\n"
+"Content-Transfer-Encoding: 8bit\n"
+
+#: dfcaverns\mine_gas\init.lua:11
+msgid ""
+"Gaseous hydrocarbons formed from the detritus of long dead plants and "
+"animals processed by heat and pressure deep within the earth."
+msgstr ""
+
+#: dfcaverns\mine_gas\init.lua:12
+msgid ""
+"Gas is highly hazardous. Heavier than air, it pools in deep caverns and "
+"asphyxiates the unwary."
+msgstr ""
+
+#: dfcaverns\mine_gas\init.lua:14
+msgid ""
+"When exposed to air and an ignition source it can produce a deadly explosion."
+msgstr ""
+
+#: dfcaverns\mine_gas\init.lua:17
+msgid "Some coal deposits have cracks that seep a steady flow of mine gas."
+msgstr ""
+
+#: dfcaverns\mine_gas\init.lua:18
+msgid "Mining out such a deposit seals the crack."
+msgstr ""
+
+#: dfcaverns\mine_gas\init.lua:26
+msgid "Mine Gas"
+msgstr ""
+
+#: dfcaverns\mine_gas\init.lua:46
+msgid "Gas Seep"
+msgstr ""

mine_gas/locale/update.bat

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+@echo off
+setlocal ENABLEEXTENSIONS ENABLEDELAYEDEXPANSION
+cd ..
+set LIST=
+for /r %%X in (*.lua) do set LIST=!LIST! %%X
+..\..\intllib\tools\xgettext.bat %LIST%

mine_gas/mod.conf

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+name = mine_gas

mine_gas/sounds/license.txt

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+mine_gas_seep_hiss.1 is from https://freesound.org/people/wubitog/sounds/234782/ under the public domain (CC0)
+mine_gas_seep_hiss.2 is from https://freesound.org/people/kgatto/sounds/240263/ by kgatto under the CC-BY-3.0 license

mine_gas/textures/license.txt

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+All textures not specifically listed here are created by FaceDeer and released under both the MIT license and under the Creative Commons CC0 license.