Replace FlatTextarea with InputField.

Telegram/SourceFiles/rpl/operators_tests.cpp

@@ -461,4 +461,36 @@ TEST_CASE("basic operators tests", "[rpl::operators]") {
 		}
 		REQUIRE(*sum == "012done012done012done");
 	}
+
+	SECTION("skip test") {
+		auto sum = std::make_shared<std::string>("");
+		{
+			rpl::lifetime lifetime;
+			ints(10) | skip(5)
+				| start_with_next_done([=](int value) {
+					*sum += std::to_string(value);
+				}, [=] {
+					*sum += "done";
+				}, lifetime);
+		}
+		{
+			rpl::lifetime lifetime;
+			ints(3) | skip(3)
+				| start_with_next_done([=](int value) {
+					*sum += std::to_string(value);
+				}, [=] {
+					*sum += "done";
+				}, lifetime);
+		}
+		{
+			rpl::lifetime lifetime;
+			ints(3) | skip(10)
+				| start_with_next_done([=](int value) {
+					*sum += std::to_string(value);
+				}, [=] {
+					*sum += "done";
+				}, lifetime);
+		}
+		REQUIRE(*sum == "56789donedonedone");
+	}
 }

Telegram/SourceFiles/rpl/rpl.h

@@ -20,6 +20,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include <rpl/never.h>
 
 #include <rpl/take.h>
+#include <rpl/skip.h>
 #include <rpl/then.h>
 #include <rpl/deferred.h>
 #include <rpl/map.h>

Telegram/SourceFiles/rpl/skip.h

@@ -0,0 +1,61 @@
+/*
+This file is part of Telegram Desktop,
+the official desktop application for the Telegram messaging service.
+
+For license and copyright information please follow this link:
+https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
+*/
+#pragma once
+
+namespace rpl {
+namespace details {
+
+class skip_helper {
+public:
+	skip_helper(int count) : _count(count) {
+	}
+
+	template <
+		typename Value,
+		typename Error,
+		typename Generator>
+	auto operator()(producer<Value, Error, Generator> &&initial) {
+		return make_producer<Value, Error>([
+			initial = std::move(initial),
+			skipping = _count
+		](const auto &consumer) mutable {
+			auto count = consumer.template make_state<int>(skipping);
+			auto initial_consumer = make_consumer<Value, Error>(
+			[consumer, count](auto &&value) {
+				if (*count) {
+					--*count;
+				} else {
+					consumer.put_next_forward(
+						std::forward<decltype(value)>(value));
+				}
+			}, [consumer](auto &&error) {
+				consumer.put_error_forward(
+					std::forward<decltype(error)>(error));
+			}, [consumer] {
+				consumer.put_done();
+			});
+			consumer.add_lifetime(initial_consumer.terminator());
+			return std::move(initial).start_existing(initial_consumer);
+		});
+	}
+
+private:
+	int _count = 0;
+
+};
+
+} // namespace details
+
+inline auto skip(int count)
+-> details::skip_helper {
+	Expects(count >= 0);
+
+	return details::skip_helper(count);
+}
+
+} // namespace rpl

Telegram/SourceFiles/rpl/take.h

@@ -53,11 +53,12 @@ private:
 };
 
 } // namespace details
+
 inline auto take(int count)
 -> details::take_helper {
 	Expects(count >= 0);
+
 	return details::take_helper(count);
 }
 
-
 } // namespace rpl