Go back to old logging system

Brought in libfmt to handle string formatting and replace a bunch of ostringstream uses.

1 files changed, 32 insertions, 0 deletions

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+#include "logger.h"
+
+#include <chrono>
+#include <fstream>
+#include <mutex>
+
+#include "global.h"
+
+namespace {
+
+class Logger {
+ public:
+  Logger() : logfile_(GetAbsolutePath("debug.log")) {}
+
+  void LogLine(const std::string& text) {
+    std::lock_guard guard(file_mutex_);
+    logfile_ << "[" << std::chrono::system_clock::now() << "] " << text
+             << std::endl;
+    logfile_.flush();
+  }
+
+ private:
+  std::ofstream logfile_;
+  std::mutex file_mutex_;
+};
+
+}  // namespace
+
+void TrackerLog(std::string text) {
+  static Logger* instance = new Logger();
+  instance->LogLine(text);
+}