Separate Tawashi and Kamokan.

Unit tests are still a bit mixed up, but that should
be simple to split once I have a separate repo for
Tawashi.

src/kamokan_impl/error_response.cpp

@@ -0,0 +1,70 @@
+/* Copyright 2017, Michele Santullo
+ * This file is part of "tawashi".
+ *
+ * "tawashi" is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * "tawashi" is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with "tawashi".  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "error_response.hpp"
+#include "error_reasons.hpp"
+#include "cgi_env.hpp"
+#include "sprout/array/array.hpp"
+#include "string_lengths.hpp"
+#include <boost/algorithm/string/replace.hpp>
+#include <boost/lexical_cast.hpp>
+#include <ciso646>
+#include <string>
+#include <cassert>
+
+namespace tawashi {
+	ErrorResponse::ErrorResponse (
+		const Kakoune::SafePtr<SettingsBag>& parSettings,
+		std::ostream* parStreamOut,
+		const Kakoune::SafePtr<cgi::Env>& parCgiEnv
+	) :
+		Response(parSettings, parStreamOut, parCgiEnv, false)
+	{
+	}
+
+	void ErrorResponse::on_mustache_prepare (mstch::map& parContext) {
+		auto get = cgi_env().query_string_split();
+		const int reason_int = boost::lexical_cast<int>(get["reason"]);
+		ErrorReasons reason_code(ErrorReasons::UnkownReason);
+		if (reason_int >= 0 and reason_int < ErrorReasons::_size())
+			reason_code = ErrorReasons::_from_integral(reason_int);
+
+		constexpr const sprout::array<const char*, ErrorReasons::_size()> err_descs {
+			"Submitted pastie is either too short or too long and was rejected.",
+			"Submitted pastie couldn't be saved.",
+			"The pastie was not saved because the client is submitting too many pasties too quickly. Please wait a bit longer and try again.",
+			"An unknown error was raised.",
+			"Unable to connect to Redis.",
+			"Request is missing a POST variable.",
+			"Pastie not found.",
+			"Invalid CONTENT_TYPE.",
+			"Unsupported CONTENT_TYPE.",
+			"Invalid pastie token."
+		};
+		constexpr const auto lengths = string_lengths(err_descs);
+		static_assert(err_descs.static_size == lengths.static_size, "Mismatching array sizes between strings and their lengths");
+
+#if !defined(NDEBUG)
+		for (std::size_t z = 0; z < err_descs.size(); ++z) {
+			assert(std::strlen(err_descs[z]) == lengths[z]);
+		}
+#endif
+
+		parContext["error_message"] = std::string(err_descs[reason_code], lengths[reason_code]);
+		parContext["error_id"] = std::to_string(reason_code);
+	}
+} //namespace tawashi