[MergeDiff] Make main method less monolithic

DATabase/MergeDiff.cs

@@ -114,12 +114,40 @@ namespace SabreTools
 				_author = "SabreTools";
 			}
 
-			// For inplace use only
+			// Create a dictionary of all ROMs from the input DATs
+			DatData userData;
+			List<DatData> datHeaders = PopulateUserData(out userData);
+
+			// Modify the Dictionary if necessary and output the results
+			if (_diff && !_cascade)
+			{
+				DiffNoCascade(userData, datHeaders);
+			}
+			// If we're in cascade and diff, output only cascaded diffs
+			else if (_diff && _cascade)
+			{
+				DiffCascade(userData, datHeaders);
+			}
+			// Output all entries with user-defined merge
+			else
+			{
+				MergeNoDiff(userData, datHeaders);
+			}
+
+			return true;
+		}
+
+		/// <summary>
+		/// Populate the user DatData object from the input files
+		/// </summary>
+		/// <param name="userData">Output user DatData object to output</param>
+		/// <returns>List of DatData objects representing headers</returns>
+		private List<DatData> PopulateUserData(out DatData userData)
+		{
 			List<DatData> datHeaders = new List<DatData>();
 
-			// Create a dictionary of all ROMs from the input DATs
 			int i = 0;
-			DatData userData = new DatData
+			userData = new DatData
 			{
 				Roms = new Dictionary<string, List<RomData>>(),
 				MergeRoms = _dedup,
@@ -173,11 +201,17 @@ namespace SabreTools
 			userData.OutputFormat = (_old ? OutputFormat.ClrMamePro : OutputFormat.Xml);
 			userData.Type = (_superdat ? "SuperDAT" : "");
 
-			// Modify the Dictionary if necessary and output the results
+			return datHeaders;
-			string post = "";
+		}
-			if (_diff && !_cascade)
+
+		/// <summary>
+		/// Output non-cascading diffs
+		/// </summary>
+		/// <param name="userData">Main DatData to draw information from</param>
+		/// <param name="datHeaders">Dat headers used optionally</param>
+		private void DiffNoCascade(DatData userData, List<DatData> datHeaders)
 		{
-				post = " (No Duplicates)";
+			string post = " (No Duplicates)";
 
 			// Get all entries that don't have External dupes
 			DatData outerDiffData = new DatData
@@ -310,9 +344,16 @@ namespace SabreTools
 
 			Output.WriteDatfile(dupeData, _outdir, _logger);
 		}
-			// If we're in cascade and diff, output only cascaded diffs
+
-			else if (_diff && _cascade)
+		/// <summary>
+		/// Output cascading diffs
+		/// </summary>
+		/// <param name="userData">Main DatData to draw information from</param>
+		/// <param name="datHeaders">Dat headers used optionally</param>
+		private void DiffCascade(DatData userData, List<DatData> datHeaders)
 		{
+			string post = "";
+
 			// Loop through _inputs first and filter from all diffed roms to find the ones that have the same "System"
 			for (int j = 0; j < _inputs.Count; j++)
 			{
@@ -390,8 +431,13 @@ namespace SabreTools
 				}
 			}
 		}
-			// Output all entries with user-defined merge
+
-			else
+		/// <summary>
+		/// Output user defined merge
+		/// </summary>
+		/// <param name="userData">Main DatData to draw information from</param>
+		/// <param name="datHeaders">Dat headers used optionally</param>
+		private void MergeNoDiff(DatData userData, List<DatData> datHeaders)
 		{
 			// If we're in SuperDAT mode, prefix all games with their respective DATs
 			if (_superdat)
@@ -418,8 +464,5 @@ namespace SabreTools
 
 			Output.WriteDatfile(userData, _outdir, _logger);
 		}
-
-			return true;
-		}
 	}
 }