/// <summary>
/// Calls the indicated custom Front-Matter field and returns the resulting value/object to be used into documents/templates
/// </summary>
/// <param name="sourceName">The name of the FM source to call. Case insensitive.</param>
/// <param name="srcParams">a list of params in test form</param>
/// <returns></returns>
public static object GetFieldValueFromFMSource(string sourceName, MIISFile file, params string[] srcParams)
{
sourceName = sourceName.ToLowerInvariant();
if (_FMSources.ContainsKey(sourceName))
{
//Instantiate a new class of this type
IFMSource fms = (IFMSource)Activator.CreateInstance(_FMSources[sourceName]);
return(fms.GetValue(file, srcParams));
}
else
{
throw new Exception($"The custom Front-Matter source '{sourceName}' does not exist!!");
}
}
//Registers all custom Front-Matter sources inside the assembly passed as a parameter
private static void RegisterCustomFMSourcesInAssembly(Assembly assembly)
{
//Custom FM sources are obtained from classes in the FMSources namespace that implement the IFMSource interface
var fmSources = from c in assembly.GetTypes()
where c.IsClass && c.Namespace == CUSTOM_FMSOURCES_NAMESPACE && typeof(IFMSource).IsAssignableFrom(c)
select c;
//Register each FMSource globally using its factory method (GetFilterType)
fmSources.ToList().ForEach(fmSourceClass =>
{
IFMSource fms = (IFMSource)Activator.CreateInstance(fmSourceClass);
//Register possible fields that will define different caches for the file
if (fms is IQueryStringDependent)
{
MarkdownFile.AddCachingQueryStringFields(
(fms as IQueryStringDependent).GetCachingQueryStringFields()
);
}
FieldValuesHelper.AddFrontMatterSource(fms.SourceName, fms.GetType());
});
}