Allows retrieval of the initial Fluid template using the declared IFileProvider

FluidParserExtensions.cs

// var parser = new FluidParser();
// parser.ParseFromFile("deane");

namespace DeaneBarker.Fluid
{
	public static class FluidParserExtensions
	{
		public static IFluidTemplate ParseFromFile(this FluidParser parser, string path)
		{
			if(TemplateOptions.Default.FileProvider == null)
			{
				throw new Exception("You have to set TemplateOptions.FileProvider first.");
			}

			var fileProvider = TemplateOptions.Default.FileProvider;

			var fileInfo = TemplateOptions.Default.FileProvider.GetFileInfo(path);
			if (fileInfo == null || !fileInfo.Exists)
			{
				throw new FileNotFoundException(path);
			}

			var template = "";

			using (var stream = fileInfo.CreateReadStream())
			using (var streamReader = new StreamReader(stream))
			{
				template = streamReader.ReadToEnd();
			}
			
			return parser.Parse(template);
		}
	}
}