Change: only output settings that are changed in crashlog

src/crashlog.cpp

@@ -136,7 +136,7 @@ void CrashLog::FillCrashLog()
 		if (!this->TryExecute("companies", [&game]() { SurveyCompanies(game["companies"]); return true; })) {
 			game["companies"] = "crashed while gathering information";
 		}
-		if (!this->TryExecute("settings", [&game]() { SurveySettings(game["settings"]); return true; })) {
+		if (!this->TryExecute("settings", [&game]() { SurveySettings(game["settings_changed"], true); return true; })) {
 			game["settings"] = "crashed while gathering information";
 		}
 		if (!this->TryExecute("grfs", [&game]() { SurveyGrfs(game["grfs"]); return true; })) {

src/network/network_survey.cpp

@@ -66,7 +66,7 @@ std::string NetworkSurveyHandler::CreatePayload(Reason reason, bool for_preview)
 		auto &game = survey["game"];
 		SurveyTimers(game["timers"]);
 		SurveyCompanies(game["companies"]);
-		SurveySettings(game["settings"]);
+		SurveySettings(game["settings"], false);
 		SurveyGrfs(game["grfs"]);
 		SurveyGameScript(game["game_script"]);
 	}

src/settings.cpp

@@ -716,6 +716,12 @@ bool IntSettingDesc::IsSameValue(const IniItem *item, void *object) const
 	return item_value == object_value;
 }
 
+bool IntSettingDesc::IsDefaultValue(void *object) const
+{
+	int32_t object_value = this->Read(object);
+	return this->def == object_value;
+}
+
 std::string StringSettingDesc::FormatValue(const void *object) const
 {
 	const std::string &str = this->Read(object);
@@ -742,12 +748,24 @@ bool StringSettingDesc::IsSameValue(const IniItem *item, void *object) const
 	return item->value->compare(str) == 0;
 }
 
+bool StringSettingDesc::IsDefaultValue(void *object) const
+{
+	const std::string &str = this->Read(object);
+	return this->def == str;
+}
+
 bool ListSettingDesc::IsSameValue(const IniItem *item, void *object) const
 {
 	/* Checking for equality is way more expensive than just writing the value. */
 	return false;
 }
 
+bool ListSettingDesc::IsDefaultValue(void *object) const
+{
+	/* Defaults of lists are often complicated, and hard to compare. */
+	return false;
+}
+
 /**
  * Loads all items from a 'grpname' section into a list
  * The list parameter can be a nullptr pointer, in this case nothing will be

src/settings_internal.h

@@ -130,6 +130,14 @@ struct SettingDesc {
 	 * @return True if the value is definitely the same (might be false when the same).
 	 */
 	virtual bool IsSameValue(const IniItem *item, void *object) const = 0;
+
+	/**
+	 * Check whether the value is the same as the default value.
+	 *
+	 * @param object The object the setting is in.
+	 * @return true iff the value is the default value.
+	 */
+	virtual bool IsDefaultValue(void *object) const = 0;
 };
 
 /** Base integer type, including boolean, settings. Only these are shown in the settings UI. */
@@ -215,6 +223,7 @@ struct IntSettingDesc : SettingDesc {
 	std::string FormatValue(const void *object) const override;
 	void ParseValue(const IniItem *item, void *object) const override;
 	bool IsSameValue(const IniItem *item, void *object) const override;
+	bool IsDefaultValue(void *object) const override;
 	int32_t Read(const void *object) const;
 
 private:
@@ -307,6 +316,7 @@ struct StringSettingDesc : SettingDesc {
 	std::string FormatValue(const void *object) const override;
 	void ParseValue(const IniItem *item, void *object) const override;
 	bool IsSameValue(const IniItem *item, void *object) const override;
+	bool IsDefaultValue(void *object) const override;
 	const std::string &Read(const void *object) const;
 
 private:
@@ -324,6 +334,7 @@ struct ListSettingDesc : SettingDesc {
 	std::string FormatValue(const void *object) const override;
 	void ParseValue(const IniItem *item, void *object) const override;
 	bool IsSameValue(const IniItem *item, void *object) const override;
+	bool IsDefaultValue(void *object) const override;
 };
 
 /** Placeholder for settings that have been removed, but might still linger in the savegame. */
@@ -334,6 +345,7 @@ struct NullSettingDesc : SettingDesc {
 	std::string FormatValue(const void *object) const override { NOT_REACHED(); }
 	void ParseValue(const IniItem *item, void *object) const override { NOT_REACHED(); }
 	bool IsSameValue(const IniItem *item, void *object) const override { NOT_REACHED(); }
+	bool IsDefaultValue(void *object) const override { NOT_REACHED(); }
 };
 
 typedef std::variant<IntSettingDesc, BoolSettingDesc, OneOfManySettingDesc, ManyOfManySettingDesc, StringSettingDesc, ListSettingDesc, NullSettingDesc> SettingVariant;

src/survey.cpp

@@ -122,8 +122,9 @@ static auto &GenericSettingTables()
  * @param survey The JSON object.
  * @param table The settings table to convert.
  * @param object The object to get the settings from.
+ * @param skip_if_default If true, skip any settings that are on their default value.
  */
-static void SurveySettingsTable(nlohmann::json &survey, const SettingTable &table, void *object)
+static void SurveySettingsTable(nlohmann::json &survey, const SettingTable &table, void *object, bool skip_if_default)
 {
 	for (auto &desc : table) {
 		const SettingDesc *sd = GetSettingDesc(desc);
@@ -131,6 +132,7 @@ static void SurveySettingsTable(nlohmann::json &survey, const SettingTable &tabl
 		if (!SlIsObjectCurrentlyValid(sd->save.version_from, sd->save.version_to)) continue;
 
 		auto name = sd->GetName();
+		if (skip_if_default && sd->IsDefaultValue(object)) continue;
 		survey[name] = sd->FormatValue(object);
 	}
 }
@@ -140,17 +142,17 @@ static void SurveySettingsTable(nlohmann::json &survey, const SettingTable &tabl
  *
  * @param survey The JSON object.
  */
-void SurveySettings(nlohmann::json &survey)
+void SurveySettings(nlohmann::json &survey, bool skip_if_default)
 {
-	SurveySettingsTable(survey, _misc_settings, nullptr);
+	SurveySettingsTable(survey, _misc_settings, nullptr, skip_if_default);
 #if defined(_WIN32) && !defined(DEDICATED)
-	SurveySettingsTable(survey, _win32_settings, nullptr);
+	SurveySettingsTable(survey, _win32_settings, nullptr, skip_if_default);
 #endif
 	for (auto &table : GenericSettingTables()) {
-		SurveySettingsTable(survey, table, &_settings_game);
+		SurveySettingsTable(survey, table, &_settings_game, skip_if_default);
 	}
-	SurveySettingsTable(survey, _currency_settings, &_custom_currency);
-	SurveySettingsTable(survey, _company_settings, &_settings_client.company);
+	SurveySettingsTable(survey, _currency_settings, &_custom_currency, skip_if_default);
+	SurveySettingsTable(survey, _company_settings, &_settings_client.company, skip_if_default);
 }
 
 /**

src/survey.h

@@ -22,7 +22,7 @@ void SurveyGameScript(nlohmann::json &survey);
 void SurveyGrfs(nlohmann::json &survey);
 void SurveyLibraries(nlohmann::json &survey);
 void SurveyOpenTTD(nlohmann::json &survey);
-void SurveySettings(nlohmann::json &survey);
+void SurveySettings(nlohmann::json &survey, bool skip_if_default);
 void SurveyTimers(nlohmann::json &survey);
 
 /* Defined in os/<os>/survey_<os>.cpp. */