Add API to register custom "can fly checks"

.luacheckrc

@@ -8,6 +8,5 @@ read_globals = {
 	"vector", "ItemStack",
 
 	"player_monoids",
-	"pova",
 	"unifieddyes",
 }

README.md

@@ -31,3 +31,17 @@ The hang glider will wear out every time you use it. The hang glider can be repa
 If the `areas` mod is installed, airspace restrictions can be added to areas using the `/area_flak` command.
 
 When using a hang glider in an area with flak enabled, you will get shot down a few seconds after entering the area, this reduces your HP to 1 and destroys your hang glider.
+
+## API
+
+#### Custom "can fly" checks
+
+```lua
+hangglider.add_fly_check(function(name, player)
+	-- `name` is the playername
+	-- `player` is the PlayerRef
+	-- Add your code here
+	-- Must return `true` (can fly) or `false` (can't fly)
+	return true
+end)
+```

init.lua

@@ -1,3 +1,4 @@
+hangglider = {}
 
 hangglider = {
 	translator = minetest.get_translator('hangglider'),
@@ -5,7 +6,6 @@ hangglider = {
 local S = hangglider.translator
 
 local has_player_monoids = minetest.get_modpath("player_monoids")
-local has_pova = minetest.get_modpath("pova")
 local has_areas = minetest.get_modpath("areas")
 
 local enable_hud_overlay = minetest.settings:get_bool("hangglider.enable_hud_overlay", true)
@@ -66,10 +66,6 @@ local function set_physics_overrides(player, overrides)
 		for name, value in pairs(overrides) do
 			player_monoids[name]:add_change(player, value, "hangglider:glider")
 		end
-	elseif has_pova then
-		pova.add_override(player:get_player_name(), "hangglider:glider",
-				{jump = 0, speed = overrides.speed, gravity = overrides.gravity})
-		pova.do_override(player)
 	else
 		player:set_physics_override(overrides)
 	end
@@ -80,28 +76,41 @@ local function remove_physics_overrides(player)
 		for _, name in pairs({"jump", "speed", "gravity"}) do
 			player_monoids[name]:del_change(player, "hangglider:glider")
 		end
-	elseif has_pova then
-		pova.del_override(player:get_player_name(), "hangglider:glider")
-		pova.do_override(player)
 	else
 		player:set_physics_override({jump = 1, speed = 1, gravity = 1})
 	end
 end
 
-local function can_fly(pos, name)
+local fly_checks = {}
-	if not enable_flak then
+
-		return true
+function hangglider.add_fly_check(func)
-	end
+	table.insert(fly_checks, func)
-	local flak = false
+end
-	local owners = {}
+
-	for _, area in pairs(areas:getAreasAtPos(pos)) do
+local function can_fly_flak(name, pos)
-		if area.flak then
+	-- Area flak check
-			flak = true
+	if enable_flak then
+		local flak = false
+		local owners = {}
+		for _, area in pairs(areas:getAreasAtPos(pos)) do
+			if area.flak then
+				flak = true
+			end
+			owners[area.owner] = true
+		end
+		if flak and not owners[name] then
+			return false
 		end
-		owners[area.owner] = true
 	end
-	if flak and not owners[name] then
+end
-		return false
+
+local function can_fly_custom(name, player)
+	-- Custom checks set by other mods
+	for _, func in ipairs(fly_checks) do
+		local ret = func(name, player)
+		if ret == false then
+			return false
+		end
 	end
 	return true
 end
@@ -157,7 +166,7 @@ local function hangglider_step(self, dtime)
 					})
 				end
 			end
-			if not can_fly(pos, name) then
+			if not can_fly_flak(name, pos) then
 				if not self.flak_timer then
 					self.flak_timer = 0
 					shoot_flak_sound(pos)
@@ -172,6 +181,9 @@ local function hangglider_step(self, dtime)
 					gliding = false
 				end
 			end
+			if not can_fly_custom(name, player) then
+				gliding = false
+			end
 			if not gliding then
 				remove_physics_overrides(player)
 				hanggliding_players[name] = nil

mod.conf

@@ -1,5 +1,5 @@
 name = hangglider
 description = Adds a functional hang glider for exploring
 depends = default, wool, dye
-optional_depends = areas, player_monoids, pova, unifieddyes
+optional_depends = areas, player_monoids, unifieddyes
 min_minetest_version = 5.0