TFE: prevent cultures from being in the Iron Age era at bookmark date (#2737) #patch

Culture history output now includes a check for the Fallen Eagle mod. If
enabled, cultures are set to join the Classical Antiquity era at
-599.1.1 to prevent them from being in the Iron Age at the bookmark
date.

Related forum posts:

https://forum.paradoxplaza.com/forum/threads/imperator-to-ck3-release-thread.1415172/post-30748509

https://forum.paradoxplaza.com/forum/threads/imperator-to-ck3-release-thread.1415172/post-30748574

Author: IhateTrains

ImperatorToCK3/CK3/Cultures/Culture.cs

@@ -78,15 +78,20 @@ public string Serialize(string indent, bool withBraces) {
 		return sb.ToString();
 	}
 
-	public async Task OutputHistory(string outputModPath, Date date) {
-		if (innovationsFromImperator.Count == 0 && innovationProgressesFromImperator.Count == 0) {
+	public async Task OutputHistory(string outputModPath, Configuration config, Date date) {
+		if (!config.FallenEagleEnabled && innovationsFromImperator.Count == 0 && innovationProgressesFromImperator.Count == 0) {
 			// Nothing to output.
 			return;
 		}
 
 		var historyStrBuilder = new StringBuilder();
 		historyStrBuilder.AppendLine("# This file was generated by the IRToCK3 converter.");
 
+		// Fix for TFE: prevent cultures from being in the Iron Age era at the bookmark date.
+		if (config.FallenEagleEnabled) {
+			historyStrBuilder.AppendLine("-599.1.1 = { join_era = culture_era_classical_antiquity }");
+		}
+
 		historyStrBuilder.AppendLine($"{date} = {{");
 		foreach (var innovationId in innovationsFromImperator) {
 			historyStrBuilder.AppendLine($"\tdiscover_innovation = {innovationId}");

ImperatorToCK3/Outputter/CulturesOutputter.cs

@@ -51,18 +51,18 @@ public static async Task OutputCultures(string outputModPath, CultureCollection
 			await output.WriteAsync(sb.ToString());
 		}
 
-		await OutputCultureHistory(outputModPath, cultures, date);
+		await OutputCultureHistory(outputModPath, cultures, config, date);
 
 		if (config.OutputCCUParameters) {
 			OutputCCUParameters(outputModPath, ck3ModFS, config.GetCK3ModFlags());
 		}
 	}
 
-	private static async Task OutputCultureHistory(string outputModPath, CultureCollection cultures, Date date) {
+	private static async Task OutputCultureHistory(string outputModPath, CultureCollection cultures, Configuration config, Date date) {
 		Logger.Info("Outputting cultures history...");
 
 		foreach (var culture in cultures) {
-			await culture.OutputHistory(outputModPath, date);
+			await culture.OutputHistory(outputModPath, config, date);
 		}
 	}