Split out wren code, add a ticker_quick() method

src/bitcoinity_ticker_price.cpp

@@ -19,7 +19,16 @@
 #include "bitcoinity_reader.hpp"
 
 namespace duck {
-TickerPrice bitcoinity_ticker_price (std::string_view currency, std::string_view exchange) {
+const std::string_view g_bitcoinity_wren_module {
+R"wren(import "ticker_price" for TickerPrice
+class Bitcoinity {
+	foreign static ticker(currency, exchange)
+	foreign static ticker_quick()
+}
+)wren"};
+
+
+TickerPrice bitcoinity_ticker_price (std::string_view exchange, std::string_view currency, bool exact_match) {
 	static const TickerPrice error_price {0.0, "", ""};
 
 	duck::BitcoinityReader bitcoinity{
@@ -53,6 +62,9 @@ TickerPrice bitcoinity_ticker_price (std::string_view currency, std::string_view
 
 		std::string_view currency_out = msg.payload.get_string_or_empty("data", "currency");
 		std::string_view exchange_out = msg.payload.get_string_or_empty("data", "exchange_name");
+		if (exact_match and (currency_out != currency or exchange_out != exchange))
+			continue; //wait 'til we get a better match
+
 		return {price_out, std::string(currency_out), std::string(exchange_out)};
 	} while (true);
 }

src/bitcoinity_ticker_price.hpp

@@ -20,5 +20,11 @@
 #include "ticker_price.hpp"
 
 namespace duck {
-TickerPrice bitcoinity_ticker_price (std::string_view currency, std::string_view exchange);
+TickerPrice bitcoinity_ticker_price (
+	std::string_view exchange,
+	std::string_view currency,
+	bool exact_match
+);
+
+extern const std::string_view g_bitcoinity_wren_module;
 } //namespace duck

src/main.cpp

@@ -20,43 +20,47 @@
 #include <wrenpp/def_configuration.hpp>
 #include <wrenpp/callback_manager.hpp>
 #include <utility>
+#include <algorithm>
 
 namespace {
 constexpr char g_script[] =
 R"script(
-foreign class TickerPrice {
-	construct new() { }
-
-	foreign price
-	foreign currency
-	foreign exchange
-	foreign is_valid
-}
-
-class Bitcoinity {
-	foreign static ticker(currency, exchange)
-}
+import "bitcoinity" for Bitcoinity
 
 class App {
-	construct new(currency, exchange) {
+	construct new(exchange, currency) {
 		_currency = currency
 		_exchange = exchange
 	}
 
 	start() {
-		var price = Bitcoinity.ticker(_currency, _exchange)
-		System.print("Ticker: %(price.price) %(price.currency) on %(price.exchange)")
+		var price_quick = Bitcoinity.ticker_quick()
+		System.print("Ticker (quick): %(price_quick.price) %(price_quick.currency) on %(price_quick.exchange)")
+
+		var price = Bitcoinity.ticker(_exchange, _currency)
+		System.print("Ticker (%(_exchange), %(_currency)): %(price.price) %(price.currency) on %(price.exchange)")
 	}
 }
 
-var the_app = App.new("USD", "kraken")
+var the_app = App.new("kraken", "USD")
 )script";
 
+void quick_ticker_price_bitcoinity_wren (wren::VM& vm) {
+	using duck::TickerPrice;
+	using duck::bitcoinity_ticker_price;
+
+	TickerPrice* const tp = wren::make_foreign_object<TickerPrice>(vm, "ticker_price");
+	constexpr bool exact_match = false;
+	*tp = bitcoinity_ticker_price("kraken", "EUR", exact_match);
+}
+
 void ticker_price_bitcoinity_wren (wren::VM& vm) {
 	using duck::TickerPrice;
+	using duck::bitcoinity_ticker_price;
 
-	TickerPrice* const tp = wren::make_foreign_object<TickerPrice>(vm, "main");
-	*tp = duck::bitcoinity_ticker_price(wren::get<const char*>(vm, 1), wren::get<const char*>(vm, 2));
+	TickerPrice* const tp = wren::make_foreign_object<TickerPrice>(vm, "ticker_price");
+	constexpr bool exact_match = true;
+	*tp = bitcoinity_ticker_price(wren::get<const char*>(vm, 1), wren::get<const char*>(vm, 2), exact_match);
 }
 
 class MyWrenConfiguration : public wren::DefConfiguration {
@@ -66,11 +70,27 @@ public:
 		std::string_view module,
 		std::string_view class_name
 	) {
-		if (module == "main" and class_name == "TickerPrice")
+		if (module == "ticker_price" and class_name == "TickerPrice")
 			return wren::make_foreign_class<duck::TickerPrice>();
 		else
 			return {nullptr, nullptr};
 	}
+
+	char* load_module_fn(wren::VM* vm, std::string_view module_name) {
+		std::string_view wren_code;
+
+		if (module_name == "bitcoinity")
+			wren_code = duck::g_bitcoinity_wren_module;
+		else if (module_name == "ticker_price")
+			wren_code = duck::g_ticker_price_wren_module;
+		else
+			return nullptr;
+
+		const std::size_t buff_sz = wren_code.size();
+		char* const buff = static_cast<char*>(MyWrenConfiguration::reallocate_fn(nullptr, buff_sz));
+		std::copy(wren_code.cbegin(), wren_code.cend(), buff);
+		return buff;
+	}
 };
 } //unnamed namespace
 
@@ -80,11 +100,12 @@ int main() {
 	MyWrenConfiguration config;
 	wren::VM vm(&config, nullptr);
 	vm.callback_manager()
-		.add_callback(true, "main", "Bitcoinity", "ticker(_,_)", &ticker_price_bitcoinity_wren)
-		.add_callback(false, "main", "TickerPrice", "price", wren::make_method_bindable<&TickerPrice::price>())
-		.add_callback(false, "main", "TickerPrice", "currency", wren::make_method_bindable<&TickerPrice::currency>())
-		.add_callback(false, "main", "TickerPrice", "is_valid", wren::make_method_bindable<&TickerPrice::is_valid>())
-		.add_callback(false, "main", "TickerPrice", "exchange", wren::make_method_bindable<&TickerPrice::exchange>());
+		.add_callback(true, "bitcoinity", "Bitcoinity", "ticker(_,_)", &ticker_price_bitcoinity_wren)
+		.add_callback(true, "bitcoinity", "Bitcoinity", "ticker_quick()", &quick_ticker_price_bitcoinity_wren)
+		.add_callback(false, "ticker_price", "TickerPrice", "price", wren::make_method_bindable<&TickerPrice::price>())
+		.add_callback(false, "ticker_price", "TickerPrice", "currency", wren::make_method_bindable<&TickerPrice::currency>())
+		.add_callback(false, "ticker_price", "TickerPrice", "is_valid", wren::make_method_bindable<&TickerPrice::is_valid>())
+		.add_callback(false, "ticker_price", "TickerPrice", "exchange", wren::make_method_bindable<&TickerPrice::exchange>());
 
 	vm.interpret("main", g_script);
 	wren::call<void>(vm, {"main", "the_app"}, "start");

src/ticker_price.cpp

@@ -18,4 +18,48 @@
 #include "ticker_price.hpp"
 
 namespace duck {
+const std::string_view g_ticker_price_wren_module {
+R"wren(foreign class TickerPrice {
+	construct new() { }
+
+	foreign price
+	foreign currency
+	foreign exchange
+	foreign is_valid
+}
+)wren"};
+
+TickerPrice::TickerPrice (double price, std::string&& currency, std::string&& exchange) :
+	m_price(price),
+	m_currency(std::move(currency)),
+	m_exchange(std::move(exchange))
+{}
+
+void TickerPrice::set_price (double price) {
+	m_price = price;
+}
+
+void TickerPrice::set_currency (std::string&& currency) {
+	m_currency = std::move(currency);
+}
+
+void TickerPrice::set_exchange (std::string&& exchange) {
+	m_exchange = std::move(exchange);
+}
+
+double TickerPrice::price() const noexcept {
+	return m_price;
+}
+
+const char* TickerPrice::currency() const noexcept {
+	return m_currency.c_str();
+}
+
+const char* TickerPrice::exchange() const noexcept {
+	return m_exchange.c_str();
+}
+
+bool TickerPrice::is_valid() const noexcept {
+	return not m_exchange.empty();
+}
 } //namespace duck

src/ticker_price.hpp

@@ -23,23 +23,21 @@ namespace duck {
 class TickerPrice {
 public:
 	TickerPrice() = default;
-	TickerPrice (double price, std::string&& currency, std::string&& exchange) :
-		m_price(price),
-		m_currency(std::move(currency)),
-		m_exchange(std::move(exchange))
-	{}
+	TickerPrice (double price, std::string&& currency, std::string&& exchange);
 
-	void set_price (double price) { m_price = price; }
-	void set_currency (std::string&& currency) { m_currency = std::move(currency); }
-	void set_exchange (std::string&& exchange) { m_exchange = std::move(exchange); }
-	double price() const noexcept { return m_price; }
-	const char* currency() const noexcept { return m_currency.c_str(); }
-	const char* exchange() const noexcept { return m_exchange.c_str(); }
-	bool is_valid() const noexcept { return not m_exchange.empty(); }
+	void set_price (double price);
+	void set_currency (std::string&& currency);
+	void set_exchange (std::string&& exchange);
+	double price() const noexcept;
+	const char* currency() const noexcept;
+	const char* exchange() const noexcept;
+	bool is_valid() const noexcept;
 
 private:
 	double m_price{};
 	std::string m_currency;
 	std::string m_exchange;
 };
+
+extern const std::string_view g_ticker_price_wren_module;
 } //namespace duck