Add "special events" log. Add console command, include in crash logs.

src/event_logs.cpp

@@ -10,6 +10,10 @@
 #include "stdafx.h"
 #include "event_logs.h"
 #include "string_func.h"
+#include "date_func.h"
+#include "company_func.h"
+#include <array>
+#include <string>
 
 #include "safeguards.h"
 
@@ -35,3 +39,66 @@ char *DumpGameEventFlags(GameEventFlags events, char *b, const char *last)
 	dump('v', GEF_VIRT_TRAIN);
 	return b;
 }
+
+struct SpecialEventLogEntry {
+	std::string msg;
+	Date date;
+	DateFract date_fract;
+	uint8 tick_skip_counter;
+	CompanyID current_company;
+	CompanyID local_company;
+
+	SpecialEventLogEntry() { }
+
+	SpecialEventLogEntry(std::string msg)
+			: msg(std::move(msg)), date(_date), date_fract(_date_fract), tick_skip_counter(_tick_skip_counter),
+			current_company(_current_company), local_company(_local_company) { }
+};
+
+struct SpecialEventLog {
+	std::array<SpecialEventLogEntry, 64> log;
+	unsigned int count = 0;
+	unsigned int next = 0;
+
+	void Reset()
+	{
+		this->count = 0;
+		this->next = 0;
+	}
+};
+
+static SpecialEventLog _special_event_log;
+
+void AppendSpecialEventsLogEntry(std::string message)
+{
+	_special_event_log.log[_special_event_log.next] = SpecialEventLogEntry(std::move(message));
+	_special_event_log.next = (_special_event_log.next + 1) % _special_event_log.log.size();
+	_special_event_log.count++;
+}
+
+char *DumpSpecialEventsLog(char *buffer, const char *last)
+{
+	const unsigned int count = std::min<unsigned int>(_special_event_log.count, 64);
+	buffer += seprintf(buffer, last, "Special Events Log:\n Showing most recent %u of %u events\n", count, _special_event_log.count);
+
+	unsigned int log_index = _special_event_log.next;
+	for (unsigned int i = 0 ; i < count; i++) {
+		if (log_index > 0) {
+			log_index--;
+		} else {
+			log_index = (uint)_special_event_log.log.size() - 1;
+		}
+		const SpecialEventLogEntry &entry = _special_event_log.log[log_index];
+
+		YearMonthDay ymd;
+		ConvertDateToYMD(entry.date, &ymd);
+		buffer += seprintf(buffer, last, " %3u | %4i-%02i-%02i, %2i, %3i | cc: %3u, lc: %3u | %s\n",
+				i, ymd.year, ymd.month + 1, ymd.day, entry.date_fract, entry.tick_skip_counter, (uint) entry.current_company, (uint) entry.local_company, entry.msg.c_str());
+	}
+	return buffer;
+}
+
+void ClearSpecialEventsLog()
+{
+	_special_event_log.Reset();
+}