Add reporting callback option to SimGear

Allows us to trigger an error logging callback explicitly, which can
be used to drive Sentry.io on the FlightGear side.

simgear/debug/CMakeLists.txt

@@ -3,8 +3,12 @@ include (SimGearComponent)
 
 set(HEADERS debug_types.h 
     logstream.hxx BufferedLogCallback.hxx OsgIoCapture.hxx
-    LogCallback.hxx LogEntry.hxx)
+    LogCallback.hxx LogEntry.hxx
+    ErrorReportingCallback.hxx)
+
 set(SOURCES logstream.cxx BufferedLogCallback.cxx
-    LogCallback.cxx LogEntry.cxx logdelta.cxx)
+    LogCallback.cxx LogEntry.cxx logdelta.cxx
+    ErrorReportingCallback.cxx
+    )
 
 simgear_component(debug debug "${SOURCES}" "${HEADERS}")

simgear/debug/ErrorReportingCallback.cxx

@@ -0,0 +1,47 @@
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Library General Public
+// License as published by the Free Software Foundation; either
+// version 2 of the License, or (at your option) any later version.
+//
+// This library 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
+// Library General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+//
+
+#include <simgear_config.h>
+
+#include "ErrorReportingCallback.hxx"
+
+using std::string;
+
+namespace simgear {
+
+static ErrorReportCallback static_callback;
+
+void setErrorReportCallback(ErrorReportCallback cb)
+{
+    static_callback = cb;
+}
+
+
+void reportError(const std::string& msg, const std::string& more)
+{
+    if (!static_callback)
+        return;
+
+    static_callback(msg, more, false);
+}
+
+void reportFatalError(const std::string& msg, const std::string& more)
+{
+    if (!static_callback)
+        return;
+    static_callback(msg, more, true);
+}
+
+} // namespace simgear

simgear/debug/ErrorReportingCallback.hxx

@@ -0,0 +1,31 @@
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Library General Public
+// License as published by the Free Software Foundation; either
+// version 2 of the License, or (at your option) any later version.
+//
+// This library 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
+// Library General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+//
+
+#pragma once
+
+#include <functional>
+#include <string>
+
+namespace simgear {
+
+void reportError(const std::string& msg, const std::string& more = {});
+
+void reportFatalError(const std::string& msg, const std::string& more = {});
+
+using ErrorReportCallback = std::function<void(const std::string& msg, const std::string& more, bool isFatal)>;
+
+void setErrorReportCallback(ErrorReportCallback cb);
+
+} // namespace simgear