Minetest-WorldEditAdditions/worldeditadditions_tools/items/movetool.lua

local wea_c = worldeditadditions_core
local wea_t = worldeditadditions_tools

local function adjust_speed_relative(player, offset)
	local overrides = wea_c.player_get_physics_override(
		player, "worldeditadditions_movetool"
	)
	if overrides == nil then overrides = {} end
	-- local overrides = player:get_physics_override()
	
	local src_speed = overrides.speed or 1
	local src_climb_speed = overrides.climb_speed or 1
	
	wea_c.player_set_physics_override(
		player, "worldeditadditions_movetool", {
			speed = math.max(src_speed + offset, 0.5),
			climb_speed = math.max(src_climb_speed + offset, 0.5)
		}
	)
	-- player:set_physics_override({
	-- })
	
	-- Completely paranoid is me
	local overrides_after = wea_c.player_get_physics_override(
		player, "worldeditadditions_movetool"
	)
	worldedit.player_notify(player:get_player_name(), "Movement speed is now x" .. tostring(overrides_after.speed))
end


local function use_primary(player)
	adjust_speed_relative(player, 0.5)
end

local function use_secondary(player)
	adjust_speed_relative(player, -0.5)
end


wea_t.register_tool("movetool", {
	description = "WorldEditAdditions movement speed adjustment tool",
	inventory_image = "worldeditadditions_movement.png",
	
	
	on_use = function(itemstack, player, pointed_thing)
		-- Left click
		use_primary(player)
	end,
	
	on_secondary_use = function(itemstack, player, pointed_thing)
		-- Right click when pointed at nothing
		use_secondary(player)
	end,
	
	on_place = function(itemstack, player, pointed_thing)
		-- Right click when pointed at something
		use_secondary(player)
	end
})