Adapt playerplus mod

mods/other/playerplus/README.md

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+PlayerPlus mod for minetest
+
+This mod lets the player move faster when walking on ice, slows down the player
+when walking on snow, makes touching a cactus hurt and suffocates player when
+their head is inside a solid node... enjoy!
+
+https://forum.minetest.net/viewtopic.php?t=10090&p=153667
+
+- 0.1 - Initial release
+- 0.2 - 3d_armor mod compatibility
+- 0.3 - Optimized code
+- 0.4 - Added suffocation when inside nodes
+- 0.5 - Slow down when walking in water
+- 0.6 - Code tidy and tweak, increased damage by cactus and suffocation
+- 0.7 - Added global 'playerplus' table to hold node names gathered around player
+- 0.8 - Player knock-back added
+- 0.9 - 'on_walk_over' function support added for nodes
+- 1.0 - Update to newer functions, requires Minetest 0.4.16 and above to run
+- 1.1 - Added support for player_monoids mod (thanks tacotexmex)
+- 1.2 - Added POVA support, tweaked code slightly
+- 1.3 - Add setting under Advanced to enable older sneak glitch movement
+- 1.4 - Add minetest 5.0 check for knockback y_offset
+- 1.5 - Use Minetext 5.x functions for proper player knockback
+
+API:
+
+Every second the mod checks which node the player is standing on, which node is
+at foot and head level and stores inside a global table to be used by mods:
+
+- playerplus[name].nod_stand
+- playerplus[name].nod_feet
+- playerplus[name].nod_head
+
+
+Older Sneak-glitch:
+
+When enabled this allows players to use the old sneak glitch movement that lets
+you climb sneak ladders and jump double blocks when using sneak+jump,
+
+old_sneak = false
+
+
+Player Knock-back:
+
+This feature is enabled by default and can be turned off by adding this line to
+your minetest.conf file:
+
+player_knockback = false
+
+
+Knock-back is determined by tool strength or a specific 'knockback' value which
+can be added to the tool damage_groups itself.  A player with the privelage
+'no_knockback' will not be affected when it's enabled.
+
+
+Node 'on_walk_over' function:
+
+When added to a node definition the function will be called whenever a player
+walks on top of the node e.g.
+
+	on_walk_over = function(pos, node, player)
+		print ("---", node.name, player:get_player_name() )
+	end

mods/other/playerplus/description.txt

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+Add speed effects, suffocation and cactus damage to players.

mods/other/playerplus/init.lua

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+--[[
+	walking on ice makes player walk faster,
+	stepping through snow slows player down,
+	touching a cactus hurts player,
+	suffocation when head is inside solid node,
+	player knock-back effects when punched.
+
+	PlayerPlus by TenPlus1
+]]
+
+playerplus = {}
+
+-- detect minetest 5.0
+local mt50 = minetest.registered_nodes["default:permafrost"]
+
+-- get node but use fallback for nil or unknown
+local node_ok = function(pos, fallback)
+
+	fallback = fallback or "air"
+
+	local node = minetest.get_node_or_nil(pos)
+
+	if node and minetest.registered_nodes[node.name] then
+		return node.name
+	end
+
+	return fallback
+end
+
+
+local time = 0
+
+
+minetest.register_globalstep(function(dtime)
+
+	time = time + dtime
+
+	-- every 1 second
+	if time < 1 then
+		return
+	end
+
+	-- reset time for next check
+	time = 0
+
+	-- define locals outside loop
+	local name, pos, ndef, def, nslow, nfast, prop
+
+	-- get list of players
+	local players = minetest.get_connected_players()
+
+	-- loop through players
+	for _,player in pairs(players) do
+
+		-- who am I?
+		name = player:get_player_name()
+
+if name and playerplus[name] then
+
+		-- where am I?
+		pos = player:get_pos()
+
+		-- what is around me?
+		playerplus[name].nod_stand = node_ok({
+			x = pos.x, y = pos.y - 0.1, z = pos.z})
+
+		-- Does the node below me have an on_walk_over function set?
+		ndef = minetest.registered_nodes[playerplus[name].nod_stand]
+		if ndef and ndef.on_walk_over then
+			ndef.on_walk_over(pos, ndef, player)
+		end
+
+		prop = player:get_properties()
+
+		-- node at eye level
+		playerplus[name].nod_head = node_ok({
+			x = pos.x, y = pos.y + prop.eye_height, z = pos.z})
+
+		-- node at foot level
+		playerplus[name].nod_feet = node_ok({
+			x = pos.x, y = pos.y + 0.2, z = pos.z})
+
+		-- are we standing on any nodes that speed player up?
+		nfast = nil
+		if playerplus[name].nod_stand == "default:ice" then
+			nfast = true
+		end
+
+		-- are we standing on any nodes that slow player down?
+		nslow = nil
+		if playerplus[name].nod_stand == "default:snow"
+		or playerplus[name].nod_stand == "default:snowblock" then
+			nslow = true
+		end
+
+		-- apply speed changes
+		if nfast and not playerplus[name].nfast then
+			physics.set(name, "playerplus:nfast", {speed = 1.2})
+
+			playerplus[name].nfast = true
+
+		elseif not nfast and playerplus[name].nfast then
+			physics.remove(name, "playerplus:nfast")
+
+			playerplus[name].nfast = nil
+		end
+
+		-- apply slowdown changes
+		if nslow and not playerplus[name].nslow then
+			physics.set(name, "playerplus:nslow", {speed = 0.85})
+
+			playerplus[name].nslow = true
+
+		elseif not nslow and playerplus[name].nslow then
+			physics.remove(name, "playerplus:nslow")
+
+			playerplus[name].nslow = nil
+		end
+
+		-- Is player suffocating inside a normal node without no_clip privs?
+		local ndef = minetest.registered_nodes[playerplus[name].nod_head]
+
+		if not ctf_match.is_in_build_time()
+		and ndef.walkable == true
+		and ndef.drowning == 0
+		and ndef.damage_per_second <= 0
+		and ndef.groups.disable_suffocation ~= 1
+		and ndef.drawtype == "normal"
+		and not minetest.check_player_privs(name, {noclip = true}) then
+
+			if player:get_hp() > 0 then
+				player:set_hp(player:get_hp() - 2)
+			end
+		end
+
+		-- am I near a cactus?
+		local near = minetest.find_node_near(pos, 1, "default:cactus")
+
+		if near then
+
+			-- am I touching the cactus? if so it hurts
+			for _,object in pairs(minetest.get_objects_inside_radius(near, 1.1)) do
+
+				if object:get_hp() > 0 then
+					object:set_hp(object:get_hp() - 2)
+				end
+			end
+
+		end
+
+end -- END if name
+
+	end
+end)
+
+
+-- check for old sneak_glitch setting
+local old_sneak = minetest.settings:get_bool("old_sneak")
+
+-- set to blank on join (for 3rd party mods)
+minetest.register_on_joinplayer(function(player)
+
+	local name = player:get_player_name()
+
+	playerplus[name] = {}
+	playerplus[name].nod_head = ""
+	playerplus[name].nod_feet = ""
+	playerplus[name].nod_stand = ""
+
+	-- apply old sneak glitch if enabled
+	if old_sneak then
+		player:set_physics_override({new_move = false, sneak_glitch = true})
+	end
+end)
+
+
+-- clear when player leaves
+minetest.register_on_leaveplayer(function(player)
+
+	playerplus[ player:get_player_name() ] = nil
+end)
+
+
+-- add privelage to disable knock-back
+minetest.register_privilege("no_knockback", {
+		description = "Disables player knock-back effect",
+		give_to_singleplayer = false})
+
+-- is player knock-back effect enabled?
+if minetest.settings:get_bool("player_knockback") == true then
+
+-- player knock-back function
+local punchy = function(
+		player, hitter, time_from_last_punch, tool_capabilities, dir, damage)
+
+	-- disable knockback during build time
+	if ctf_match.is_in_build_time() then return end
+
+	-- check if player and hitter are in the same team
+	if ctf.player(player:get_player_name()).team == ctf.player(hitter:get_player_name()).team then
+		return
+	end
+
+	if not dir then return end
+
+	-- check if player has 'no_knockback' privelage
+	local privs = minetest.get_player_privs(player:get_player_name())
+
+	if privs["no_knockback"] then
+		return
+	end
+
+	local damage = 0
+
+	-- get tool damage
+	if tool_capabilities then
+
+		local armor = player:get_armor_groups() or {}
+		local tmp
+
+		for group,_ in pairs( (tool_capabilities.damage_groups or {}) ) do
+
+			tmp = time_from_last_punch / (tool_capabilities.full_punch_interval or 1.4)
+
+			if tmp < 0 then
+				tmp = 0.0
+			elseif tmp > 1 then
+				tmp = 1.0
+			end
+
+			damage = damage + (tool_capabilities.damage_groups[group] or 0) * tmp
+
+			-- limit knockback
+			if damage > 8 then
+				damage = 8
+			end
+		end
+
+		-- disable knockback for swords
+		if tool_capabilities.damage_groups["sword"] then
+			damage = 0
+		end
+
+		-- check for knockback value
+		if tool_capabilities.damage_groups["knockback"] then
+			damage = tool_capabilities.damage_groups["knockback"]
+		end
+
+	end
+	-- END tool damage
+
+--	print ("---", player:get_player_name(), damage)
+
+	-- knock back player
+	player:add_velocity({
+		x = dir.x * (damage * 2),
+		y = -1,
+		z = dir.z * (damage * 2)
+	})
+end
+
+minetest.register_on_punchplayer(punchy)
+
+end -- END if
+
+minetest.register_tool("playerplus:stick", {
+	description = "KB Stick",
+	inventory_image = "default_stick.png",
+	wield_image = "default_stick.png",
+	tool_capabilities = {
+		full_punch_interval = 1.4,
+		damage_groups = {fleshy = 0, knockback = 11},
+	},
+})
+
+--[[
+minetest.override_item("default:mese", {
+	on_walk_over = function(pos, node, player)
+		print ("---", node.name, player:get_player_name() )
+	end
+})
+]]

mods/other/playerplus/license.txt

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+The MIT License (MIT)
+
+Copyright (c) 2016 TenPlus1
+
+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.

mods/other/playerplus/mod.conf

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+name = playerplus
+depends = ctf_match, physics, ctf
+optional_depends = default
+description = Add speed effects, suffocation and cactus damage to players.

mods/other/playerplus/settingtypes.txt

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+#    If enabled players are knocked back when hit by mobs or other players
+player_knockback (Player knockback) bool false
+#    If enabled the players use the old sneak glitch and movements
+old_sneak (Use old sneak glitch) bool false