# HoI4 State Land Connection Indexer

# HoI4 State Land Connection Indexer by Yard1
# Provides a simple way to check if two states share a land connection
# Call the scripted effect below in on_startup from a country scope (any will do, I suggest random_country)
# In order to check if two states have a land connection to each other, compare their state_land_connection_index variables. If they are the same, then they have a land connection.
mark_land_connected_states = {
	random_country = {
		set_variable = { global.current_state_land_connection_index = 1 }
		every_state = {
			add_to_array = { global.unchecked_land_connection_states = THIS }
		}
		while_loop_effect = {
			limit = {
				check_variable = { global.unchecked_land_connection_states^num > 0 }
			}
			log = "Run land connection loop with index [?global.current_state_land_connection_index|0], [?global.unchecked_land_connection_states^num|0] states left to index"
			var:global.unchecked_land_connection_states^0 = {
				log = "Adding index [?global.current_state_land_connection_index|0] to [?this.GetName]"
				set_variable = { state_land_connection_index = global.current_state_land_connection_index }
				every_neighbor_state = {
					log = "Adding index [?global.current_state_land_connection_index|0] to [?this.GetName], neighbor of [?prev.GetName]"
					set_variable = { state_land_connection_index = global.current_state_land_connection_index }
					if = {
						limit = { is_in_array = { global.unchecked_land_connection_states = THIS } }
						remove_from_array = { global.unchecked_land_connection_states = THIS }
					}
				}
				remove_from_array = { global.unchecked_land_connection_states = THIS }
			}
			set_temp_variable = { temp_lc_state = 0 }
			while_loop_effect = {
				limit = {
					any_of = {
						array = global.unchecked_land_connection_states
						var:v = {
							any_neighbor_state = { has_variable = state_land_connection_index }
						}
						set_temp_variable = { global.temp_lc_state = v }
					}
				}
				if = {
					limit = { NOT = { check_variable = { temp_lc_state = 0 } } }
					log = "Found [?temp_lc_state.GetName] as a neighbor of an indexed state"
					var:temp_lc_state = {
						log = "Adding index [?global.current_state_land_connection_index|0] to [?this.GetName]"
						set_variable = { state_land_connection_index = global.current_state_land_connection_index }
						remove_from_array = { global.unchecked_land_connection_states = THIS }
						every_neighbor_state = {
							log = "Adding index [?global.current_state_land_connection_index|0] to [?this.GetName], neighbor of [?prev.GetName]"
							set_variable = { state_land_connection_index = global.current_state_land_connection_index }
							if = {
								limit = { is_in_array = { global.unchecked_land_connection_states = THIS } }
								remove_from_array = { global.unchecked_land_connection_states = THIS }
							}
						}
					}
				}
			}
			log = "Land connection loop done, [?global.unchecked_land_connection_states^num|0] states left to index"
			log = "----"
			add_to_variable = { global.current_state_land_connection_index = 1 }
		}
		clear_variable = global.current_state_land_connection_index
		clear_array = global.unchecked_land_connection_states
	}
}

Usage:
1. Put in on_startup in a country scope (any, doesn't matter which, you can use `random_country`)
2. In order to check if two states have a land connection to each other, compare their `state_land_connection_index` variables. If they are the same, then they have a land connection. Example:

# If this returns true, then the capitals of THIS and FROM share a land connection
check_variable = { THIS.capital.state_land_connection_index = FROM.capital.state_land_connection_index }