Tweak world cycle, add documentation

lib/api.lua

@@ -1,12 +1,17 @@
+-- initialize API interface
 local api = {}
 
-api.SHORT_CYCLE		= 0.03	-- for particles and fast animations
-api.DEFAULT_CYCLE	=  0.1	-- for most effect types
-api.MEDIUM_CYCLE	=	 2.0	-- for ressource intensive tasks
-api.LONG_CYCLE		=  5.0	-- for write operations and skybox changes
+-- define various standard effect cycle lengths
+api.SHORT_CYCLE		=	0		-- for particles and fast animations (use GSCYCLE)
+api.DEFAULT_CYCLE	=	0.1	-- for most effect types
+api.MEDIUM_CYCLE	=	2.0	-- for ressource intensive tasks
+api.LONG_CYCLE		=	5.0	-- for write operations and skybox changes
 
+-- register new weather presets (like rain)
+-- @param name <string> Unique preset name, ideally prefixed
+-- @param conditions <table> A collection of required influences
+-- @param effects <table> A <table> containing all applied effects as keys and parameters as values
 function api.register_weather(name, conditions, effects)
-	-- TODO: check and sanitize
 	climate_mod.weathers[name] = {
 		conditions = conditions,
 		effects = effects,
@@ -14,6 +19,10 @@ function api.register_weather(name, conditions, effects)
 	}
 end
 
+-- register new weather effects (like particles)
+-- @param name <string> Unique effect name, ideally prefixed
+-- @param handler <function> A function to be called when the effect is active
+-- @param htype <string: start|tick|stop>  Determines when the function is called
 function api.register_effect(name, handler, htype)
 	-- check for valid handler types
 	if htype ~= "start" and htype ~= "tick" and htype ~= "stop" then
@@ -29,18 +38,32 @@ function api.register_effect(name, handler, htype)
 	table.insert(climate_mod.effects[name][htype], handler)
 end
 
+-- set cycle length of given effect
+-- @param name <string> Name of the affected effect
+-- @param cycle <number> Duration between function calls
 function api.set_effect_cycle(name, cycle)
 	climate_mod.cycles[name].timespan = cycle
 end
 
+-- register new environment influence that is independent of position
+-- @param name <string> Unique influence name
+-- @param func <function> Returns current influence value for entire world
 function api.register_global_influence(name, func)
 	climate_mod.global_influences[name] = func
 end
 
+-- register new environment influence based on position
+-- @param name <string> Unique influence name
+-- @param func <function> Returns current influence value for given position
 function api.register_influence(name, func)
 	climate_mod.influences[name] = func
 end
 
+-- register new Active Block Modifier dependent on weather status
+-- Uses same config as Minetest.register_abm() but also adds
+-- conditions similiar to weather presets and provides local environment
+-- to action event handler as third parameter.
+-- @param config <table> ABM configuration with additional information
 function api.register_abm(config)
 	if not climate_mod.settings.block_updates then return end
 
@@ -48,16 +71,21 @@ function api.register_abm(config)
 	local action = config.action
 	local pos_override = config.pos_override
 
+	-- override action handler to inject weather status
 	local override = function(pos, node)
-		local env = climate_mod.trigger.get_position_environment(pos)
 		if type(pos_override) == "function" then
 			pos = pos_override(pos)
+			node = minetest.get_node(pos)
 		end
 
+		-- get environment influences for current position
+		local env = climate_mod.trigger.get_position_environment(pos)
+
 		if conditions == nil then
 			return action(pos, node, env)
 		end
 
+		-- check if all conditions are met
 		for condition, goal in pairs(conditions) do
 			local is_applicable = climate_mod.trigger.test_condition(condition, env, goal)
 			if not is_applicable then return end
@@ -65,9 +93,11 @@ function api.register_abm(config)
 		return action(pos, node, env)
 	end
 
+	-- register overridden abm setup
 	config.conditions = nil
 	config.action = override
 	minetest.register_abm(config)
 end
 
+-- return supplied API endpoint
 return api