Add TSV support.

Import Upload

Web/DAL/FuelmanCsvImporter.cs

@@ -2,6 +2,7 @@
 using System.Collections.Generic;
 using System.Globalization;
 using System.IO;
+using System.Linq;
 using CsvHelper;
 using CsvHelper.Configuration;
 using MileageTraker.Web.Models;
@@ -9,10 +10,11 @@ using MileageTraker.Web.Utility;
 
 namespace MileageTraker.Web.DAL
 {
-	public class FuelmanCsvImporter
+	public static class FuelmanCsvImporter
     {
 		private sealed class FuelmanCsvClassMap : CsvClassMap<FuelLog>
 		{
+			readonly string[] _dateFormats = { @"M/d/yy HH:mm", @"M/d/yyyy HH:mm" };
 			public FuelmanCsvClassMap()
 			{
 				Map(m => m.Date).ConvertUsing(row =>
@@ -20,7 +22,12 @@ namespace MileageTraker.Web.DAL
 						var date = row.GetField("CEDATE");
 						var time = row.GetField<int>("CETIME");
 						var dttm = string.Format(@"{0} {1:00:00}", date, time);
-						return DateTime.ParseExact(dttm, @"M/d/yyyy HH:mm", CultureInfo.InvariantCulture);
+
+						DateTime parsed;
+						if (DateTime.TryParseExact(dttm, _dateFormats, CultureInfo.InvariantCulture, DateTimeStyles.None, out parsed))
+							return parsed;
+
+						throw new ArgumentException(string.Format("Date in incorrect format: CEDATE:{0} CETIME:{1}", date, time));
 					});
 				Map(m => m.DriverFullName).ConvertUsing(row =>
 					{
@@ -41,16 +48,35 @@ namespace MileageTraker.Web.DAL
 			}
 		}
 
-		public static IEnumerable<FuelLog> Import(string filename)
+		public static bool IsProbablyTabSeparated(FileInfo fileInfo)
+		{
+			using (var tr = File.OpenText(fileInfo.FullName))
+			{
+				var line = tr.ReadLine();
+				var tabHeadCount = 
+					(from c in line
+					 where c == '\t'
+					 select c).Count();
+				// if there's more than 10 tabs in the first line, probably TSV
+				return tabHeadCount > 10;
+			}
+		}
+
+		public static ICollection<FuelLog> Import(FileInfo fileInfo)
 		{
-			var fileInfo = new FileInfo(filename);
 			if (!fileInfo.Exists)
-				throw new ImportException("Cannot find file '" + filename + "'");
+				throw new ImportException("Cannot find file '" + fileInfo.Name + "'");
+
+			var tabSeparatedValues = IsProbablyTabSeparated(fileInfo);
 
 			using (var tr = File.OpenText(fileInfo.FullName))
 			{
- 				var csv = new CsvReader(tr);
-				csv.Configuration.RegisterClassMap<FuelmanCsvClassMap>();
+				var csvConfiguration = new CsvConfiguration();
+				if (tabSeparatedValues)
+					csvConfiguration.Delimiter = "\t";
+				csvConfiguration.RegisterClassMap<FuelmanCsvClassMap>();
+
+				var csv = new CsvReader(tr, csvConfiguration);
 
 				var fuelLogs = new List<FuelLog>();
 				while (csv.Read())