WIP: Log warnings to file

src/typica.w

 @<Header files to include@>@/
 @<Class declarations@>@/
 @<Function prototypes for scripting@>@/
+@<Logging function prototype@>@/
 @<Class implementations@>@/
 @<Functions for scripting@>@/
+@<Logging function implementation@>@/
 @<The main program@>
 #include "moc_typica.cpp"
 
 @<The main program@>=
 int main(int argc, char **argv)@/
 {@/
+	@<Set up logging@>@;
 	int *c = &argc;
 	Application app(*c, argv);
 	@<Set up icons@>@;
 	return retval;@/
 }
 
+@ Proof of concept for the introduction of logging warnings to a file. This is
+primarily for the benefit of people using Windows without an attached debugger.
+Before this is merged to development it should allow the person using Typica
+more control over if this should be enabled (by default it should not) and
+where the output is sent.
+
+@<Set up logging@>=
+qInstallMsgHandler(messageFileOutput);
+
+@ This requires that we have our messageFileOutput function.
+
+@<Logging function prototype@>=
+void messageFileOutput(QtMsgType type, const char *msg);
+
+@ The current implementation is straightforward.
+
+@<Logging function implementation@>=
+void messageFileOutput(QtMsgType type, const char *msg)
+{
+	QFile output("Typica-"+QDate::currentDate().toString("yyyy-MM-dd")+".log");
+	output.open(QIODevice::WriteOnly | QIODevice::Append);
+	QTextStream outstream(&output);
+	outstream << msg << "\n";
+}
+
 @ \pn{} 1.4 introduces the ability to use icons in certain interface elements.
 Some commonly desired public domain graphics are provided by the Tango Desktop
 Project. We also set an application level default window icon.