4 files changed, 38 insertions, 11 deletions

diff --git a/src/openvic-simulation/dataloader/Dataloader.cpp b/src/openvic-simulation/dataloader/Dataloader.cpp
index 56cf40c..b7ccba3 100644
--- a/src/openvic-simulation/dataloader/Dataloader.cpp
+++ b/src/openvic-simulation/dataloader/Dataloader.cpp
@@ -683,6 +683,8 @@ bool Dataloader::_load_map_dir(GameManager& game_manager) const {
 	static constexpr std::string_view default_province_flag_sprite = "province_flag_sprites"; /* Canal sprite/model names. */
 	static constexpr std::string_view climate_file = "climate.txt";
 
+	static constexpr std::string_view region_colours = "interface/colors.txt"; /* This file is not in map_directory */
+
 	/* Parser stored so the filename string_views persist until the end of this function. */
 	const v2script::Parser parser = parse_defines(lookup_file(append_string_views(map_directory, defaults_filename)));
 
@@ -735,9 +737,21 @@ bool Dataloader::_load_map_dir(GameManager& game_manager) const {
 		ret = false;
 	}
 
-	if (!map.load_region_file(parse_defines(lookup_file(append_string_views(map_directory, region))).get_file_node())) {
-		Logger::error("Failed to load region file!");
-		ret = false;
+	{
+		std::vector<colour_t> colours;
+		if (!Map::load_region_colours(parse_defines(lookup_file(region_colours)).get_file_node(), colours)) {
+			Logger::error("Failed to load region colours file!");
+			ret = false;
+		}
+
+		using namespace OpenVic::colour_literals;
+		colours.push_back(0xFFFFFF_rgb); /* This ensures there is always at least one region colour. */
+
+		if (!map.load_region_file(
+				parse_defines(lookup_file(append_string_views(map_directory, region))).get_file_node(), colours)) {
+			Logger::error("Failed to load region file!");
+			ret = false;
+		}
 	}
 
 	if (!map.set_water_province_list(water_province_identifiers)) {
diff --git a/src/openvic-simulation/map/Map.cpp b/src/openvic-simulation/map/Map.cpp
index a5cd6a6..f87246f 100644
--- a/src/openvic-simulation/map/Map.cpp
+++ b/src/openvic-simulation/map/Map.cpp
@@ -292,7 +292,7 @@ void Map::lock_water_provinces() {
 	Logger::info("Locked water provinces after registering ", water_provinces.size());
 }
 
-bool Map::add_region(std::string_view identifier, Region::provinces_t const& provinces) {
+bool Map::add_region(std::string_view identifier, Region::provinces_t const& provinces, colour_t colour) {
 	if (identifier.empty()) {
 		Logger::error("Invalid region identifier - empty!");
 		return false;
@@ -304,7 +304,7 @@ bool Map::add_region(std::string_view identifier, Region::provinces_t const& pro
 
 	const bool meta = std::any_of(provinces.begin(), provinces.end(), std::bind_front(&Province::get_has_region));
 
-	Region region { identifier, provinces.front()->get_colour(), meta };
+	Region region { identifier, colour, meta };
 	bool ret = region.add_provinces(provinces);
 	region.lock();
 	if (regions.add_item(std::move(region))) {
@@ -562,15 +562,27 @@ bool Map::load_province_positions(BuildingTypeManager const& building_type_manag
 	})(root);
 }
 
-bool Map::load_region_file(ast::NodeCPtr root) {
+bool Map::load_region_colours(ast::NodeCPtr root, std::vector<colour_t>& colours) {
+	return expect_dictionary_reserve_length(
+		colours,
+		[&colours](std::string_view key, ast::NodeCPtr value) -> bool {
+			if (key != "color") {
+				Logger::error("Invalid key in region colours: \"", key, "\"");
+				return false;
+			}
+			return expect_colour(vector_callback(colours))(value);
+	})(root);
+}
+
+bool Map::load_region_file(ast::NodeCPtr root, std::vector<colour_t> const& colours) {
 	const bool ret = expect_dictionary_reserve_length(
 		regions,
-		[this](std::string_view region_identifier, ast::NodeCPtr region_node) -> bool {
+		[this, &colours](std::string_view region_identifier, ast::NodeCPtr region_node) -> bool {
 			Region::provinces_t provinces;
 			bool ret = expect_list_reserve_length(
 				provinces, expect_province_identifier(vector_callback_pointer(provinces))
 			)(region_node);
-			ret &= add_region(region_identifier, provinces);
+			ret &= add_region(region_identifier, provinces, colours[regions.size() % colours.size()]);
 			return ret;
 		}
 	)(root);
diff --git a/src/openvic-simulation/map/Map.hpp b/src/openvic-simulation/map/Map.hpp
index a472a6c..e2c4bd6 100644
--- a/src/openvic-simulation/map/Map.hpp
+++ b/src/openvic-simulation/map/Map.hpp
@@ -116,7 +116,7 @@ namespace OpenVic {
 		Province* get_selected_province();
 		Province::index_t get_selected_province_index() const;
 
-		bool add_region(std::string_view identifier, Region::provinces_t const& provinces);
+		bool add_region(std::string_view identifier, Region::provinces_t const& provinces, colour_t colour);
 
 		bool add_mapmode(std::string_view identifier, Mapmode::colour_func_t colour_func);
 
@@ -139,7 +139,8 @@ namespace OpenVic {
 		bool load_province_definitions(std::vector<ovdl::csv::LineObject> const& lines);
 		/* Must be loaded after adjacencies so we know what provinces are coastal, and so can have a port */
 		bool load_province_positions(BuildingTypeManager const& building_type_manager, ast::NodeCPtr root);
-		bool load_region_file(ast::NodeCPtr root);
+		static bool load_region_colours(ast::NodeCPtr root, std::vector<colour_t>& colours);
+		bool load_region_file(ast::NodeCPtr root, std::vector<colour_t> const& colours);
 		bool load_map_images(fs::path const& province_path, fs::path const& terrain_path, bool detailed_errors);
 		bool generate_and_load_province_adjacencies(std::vector<ovdl::csv::LineObject> const& additional_adjacencies);
 		bool load_climate_file(ModifierManager const& modifier_manager, ast::NodeCPtr root);
diff --git a/src/openvic-simulation/types/Colour.hpp b/src/openvic-simulation/types/Colour.hpp
index 304d9de..b1888f2 100644
--- a/src/openvic-simulation/types/Colour.hpp
+++ b/src/openvic-simulation/types/Colour.hpp
@@ -399,7 +399,7 @@ namespace OpenVic {
 	using colour_t = colour_rgb_t;
 
 	namespace colour_literals {
-		constexpr colour_t operator""_colour(unsigned long long value) {
+		constexpr colour_t operator""_rgb(unsigned long long value) {
 			return colour_t::from_integer(value);
 		}