[WIP] Add motd to autohost and challenge

doc/hosting/AutohostConfig.md

@@ -45,6 +45,26 @@ Each player slot can be customized, starting from 0. The first slot will be defi
 * `difficulty` sets the difficulty for an AI. It can be one of `Easy`, `Medium`, `Hard` or `Insane`.
 * `name` sets a custom name for the AI.
 
+## Message of the Day
+
+The `motd` is displayed in the chat box when a player joins the game. It is optional and will be truncated if it exceeds 256 characters.
+
+It can be a single text entry or an object defining multiple messages in various languages. The default language will be `en` (English) and it must be provided. The default language can be changed by providing a `default` entry.
+
+```
+"motd": "Hello world"
+```
+or
+```
+"motd": {
+    "default": "de",
+    "de": "Hallo Welt",
+    "en": "Hello world",
+    "fr": "Bonjour le monde",
+    "ru": "привет мир"
+}
+```
+
 ## Sample file
 
 ```
@@ -83,6 +103,7 @@ Each player slot can be customized, starting from 0. The first slot will be defi
 	},
 	"player_3": {
 		"team": 1
-	}
+	},
+	"motd": "Good Luck, Have Fun!"
 }
 ```

lib/framework/i18n.h

@@ -53,6 +53,9 @@
 // Make xgettext recognize the context
 #define NP_(Context, String) gettext_noop(String)
 
+#define MAX_LOCALE_CODE_LENGTH	(5)
+#define DEFAULT_LOCALE "en"
+
 WZ_DECL_PURE const char *getLanguage();
 WZ_DECL_PURE const char *getLanguageName();
 WZ_DECL_NONNULL(1) bool setLanguage(const char *name);

lib/framework/wzi18nstring.cpp

@@ -0,0 +1,182 @@
+/*
+ *	This file is part of Warzone 2100.
+ *	Copyright (C) 2024  Warzone 2100 Project
+ *
+ *	Warzone 2100 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 2 of the License, or
+ *	(at your option) any later version.
+ *
+ *	Warzone 2100 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 Warzone 2100; if not, write to the Free Software
+ *	Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "wzi18nstring.h"
+
+#include "i18n.h"
+#include "wzglobal.h"
+
+WzI18nString::WzI18nString()
+{
+	_defaultLocale = DEFAULT_LOCALE;
+	_strings[_defaultLocale] = WzString();
+}
+
+
+WzI18nString::WzI18nString(WzString string)
+{
+	_defaultLocale = DEFAULT_LOCALE;
+	_strings[_defaultLocale] = string;
+}
+
+WzI18nString::WzI18nString(const WzI18nString& other)
+{
+	_defaultLocale = other._defaultLocale;
+	for (const auto &locale : other.listLocales())
+	{
+		_strings[std::string(locale)] = WzString(other.getLocaleString(locale));
+	}
+}
+
+WzI18nString::WzI18nString(WzConfig &ini, const WzString &key, const int maxChars)
+{
+	if (!ini.contains(key))
+	{
+		reset();
+		return;
+	}
+	json_variant value = ini.value(key);
+	if (value.jsonValue().is_string())
+	{
+		WzString string = value.toWzString();
+		if (string.length() > maxChars)
+		{
+			string.truncate(maxChars);
+			debug(LOG_WARNING, "%s: value for %s was truncated to fit into %d characters.", ini.fileName().toUtf8().c_str(), key.toUtf8().c_str(), maxChars);
+		}
+		_defaultLocale = DEFAULT_LOCALE;
+		_strings[_defaultLocale] = string;
+		return;
+	}
+	if (ini.beginGroup(key))
+	{
+		for (auto locale : getLocales())
+		{
+			std::string localeCode = std::string(locale.code);
+			WzString string = ini.string(WzString::fromUtf8(localeCode));
+			if (string.length() > maxChars)
+			{
+				string.truncate(maxChars);
+				debug(LOG_WARNING, "%s: value for %s (%s) was truncated to fit into %d characters.", ini.fileName().toUtf8().c_str(), key.toUtf8().c_str(), localeCode.c_str(), maxChars);
+			}
+			if (!string.isEmpty())
+			{
+				_strings[localeCode] = string;
+			}
+		}
+		_defaultLocale = DEFAULT_LOCALE;
+		WzString altDefault = ini.string(WzString::fromUtf8("default"));
+		if (!altDefault.isEmpty())
+		{
+			_defaultLocale = altDefault.toUtf8();
+		}
+		if (!this->contains(_defaultLocale))
+		{
+			debug(LOG_ERROR, "%s: no entry for %s in default language %s.", ini.fileName().toUtf8().c_str(), key.toUtf8().c_str(), _defaultLocale.c_str());
+			reset();
+		}
+		ini.endGroup();
+	}
+}
+
+bool WzI18nString::contains(std::string localeCode) const
+{
+	return _strings.find(localeCode) != _strings.end();
+}
+
+bool WzI18nString::isEmpty() const
+{
+	return this->getDefaultString().isEmpty();
+}
+
+const std::string& WzI18nString::getDefaultLocaleCode() const
+{
+	return _defaultLocale;
+}
+
+const WzString& WzI18nString::getDefaultString() const
+{
+	return _strings.find(_defaultLocale)->second;
+}
+
+const WzString& WzI18nString::getLocaleString() const
+{
+	return this->getLocaleString(getLanguage());
+}
+
+const WzString& WzI18nString::getLocaleString(const char* localeCode) const
+{
+	return this->getLocaleString(std::string(localeCode));
+}
+
+const WzString& WzI18nString::getLocaleString(std::string localeCode) const
+{
+	auto it = _strings.find(localeCode);
+	if (it != _strings.end())
+	{
+		return it->second;
+	}
+	return _strings.find(_defaultLocale)->second;
+}
+
+std::vector<std::string> WzI18nString::listLocales() const
+{
+	std::vector<std::string> locales;
+	for (auto it = _strings.begin(); it != _strings.end(); ++it)
+	{
+		locales.push_back(it->first);
+	}
+	return locales;
+}
+
+void WzI18nString::reset()
+{
+	_defaultLocale = DEFAULT_LOCALE;
+	_strings.clear();
+	_strings[_defaultLocale] = WzString();
+}
+
+void WzI18nString::reset(std::string &defaultLocale)
+{
+	_strings.clear();
+	_defaultLocale = defaultLocale;
+	_strings[_defaultLocale] = WzString();
+}
+
+void WzI18nString::reset(std::string &defaultLocale, WzString &text)
+{
+	_strings.clear();
+	_defaultLocale = defaultLocale;
+	_strings[_defaultLocale] = text;
+}
+
+void WzI18nString::setLocaleString(const char* localeCode, WzString text)
+{
+	_strings[localeCode] = text;
+}
+
+WzI18nString& WzI18nString::operator=(const WzI18nString& other)
+{
+	_defaultLocale = other._defaultLocale;
+	for (const auto &locale : other.listLocales())
+	{
+		_strings[std::string(locale)] = WzString(other.getLocaleString(locale));
+	}
+	return *this;
+}

lib/framework/wzi18nstring.h

@@ -0,0 +1,61 @@
+/*
+ *	This file is part of Warzone 2100.
+ *	Copyright (C) 2024  Warzone 2100 Project
+ *
+ *	Warzone 2100 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 2 of the License, or
+ *	(at your option) any later version.
+ *
+ *	Warzone 2100 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 Warzone 2100; if not, write to the Free Software
+ *	Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef _LIB_FRAMEWORK_WZI18NSTRING_H
+#define _LIB_FRAMEWORK_WZI18NSTRING_H
+
+#include <string>
+#include <map>
+#include <vector>
+#include "lib/framework/wzstring.h"
+#include "lib/framework/wzconfig.h"
+
+/**
+ * User provided multilingual string.
+ */
+class WzI18nString {
+public:
+	WzI18nString();
+	WzI18nString(WzString string);
+	WzI18nString(std::string defaultLocale, std::map<std::string, WzString> strings);
+	WzI18nString(WzConfig &ini, const WzString &key, const int maxChars);
+	WzI18nString(const WzI18nString& other);
+
+	bool contains(std::string localeCode) const;
+	bool isEmpty() const;
+	const std::string& getDefaultLocaleCode() const;
+	const WzString& getDefaultString() const;
+	const WzString& getLocaleString() const;
+	/** Get the string in the given locale or the default one if not set. */
+	const WzString& getLocaleString(const char* localeCode) const;
+	const WzString& getLocaleString(std::string localeCode) const;
+	std::vector<std::string> listLocales() const;
+public:
+	void reset();
+	void reset(std::string &defaultlocale);
+	void reset(std::string &defaultLocale, WzString &text);
+	void setLocaleString(const char* localeCode, WzString text);
+public:
+	WzI18nString& operator=(const WzI18nString& other);
+private:
+	std::string _defaultLocale;
+	std::map<std::string, WzString> _strings;
+};
+
+#endif // _LIB_FRAMEWORK_WZI18NSTRING_H

lib/netplay/netplay.cpp

@@ -5804,6 +5804,7 @@ const char *messageTypeToString(unsigned messageType_)
 	case NET_PING:                      return "NET_PING";
 	case NET_PLAYER_STATS:              return "NET_PLAYER_STATS";
 	case NET_TEXTMSG:                   return "NET_TEXTMSG";
+	case NET_I18NTEXTMSG:               return "NET_I18NTEXTMSG";
 	case NET_PLAYERRESPONDING:          return "NET_PLAYERRESPONDING";
 	case NET_OPTIONS:                   return "NET_OPTIONS";
 	case NET_KICK:                      return "NET_KICK";

lib/netplay/netplay.h

@@ -66,6 +66,7 @@ enum MESSAGE_TYPES
 	NET_PING,                       ///< ping players.
 	NET_PLAYER_STATS,               ///< player stats
 	NET_TEXTMSG,                    ///< A simple text message between machines.
+	NET_I18NTEXTMSG,                ///< A multilingual text message between machines.
 	NET_PLAYERRESPONDING,           ///< computer that sent this is now playing warzone!
 	NET_OPTIONS,                    ///< welcome a player to a game.
 	NET_KICK,                       ///< kick a player .