[DatTools] Add reverse cascade

Add reverse cascaded diffing. Essentially this just reverses the list of input files so that the last file is treated as the first and so on. Has not been tested.

SabreTools.Helper/Data/Build.cs

@@ -176,6 +176,9 @@ Options:
 		-c, --cascade		Enable cascaded diffing
 			-ip, --inplace		Enable inplace, cascaded diff
 			-sf, --skip		Skip output of first DAT
+		-rc, --rev-cascade	Enable reverse cascaded diffing
+			-ip, --inplace		Enable inplace, cascaded diff
+			-sf, --skip		Skip output of first DAT
 	-gn=, --game-name=	Filter by game name
 	-rn=, --rom-name=	Filter by rom name
 	-rt=, --rom-type=	Filter by rom type

SabreTools.Helper/Tools/DatTools.cs

@@ -1520,7 +1520,7 @@ namespace SabreTools.Helper
 		/// <param name="outputDirectory">Optional param for output directory</param>
 		/// <param name="merge">True if input files should be merged into a single file, false otherwise</param>
 		/// <param name="diff">True if the input files should be diffed with each other, false otherwise</param>
-		/// <param name="cascade">True if the diffed files should be cascade diffed, false otherwise</param>
+		/// <param name="cascade">True if the diffed files should be cascade diffed, false if diffed files should be reverse cascaded, null otherwise</param>
 		/// <param name="inplace">True if the cascade-diffed files should overwrite their inputs, false otherwise</param>
 		/// <param name="skip">True if the first cascaded diff file should be skipped on output, false otherwise</param>
 		/// <param name="bare">True if the date should not be appended to the default name, false otherwise [OBSOLETE]</param>
@@ -1540,7 +1540,7 @@ namespace SabreTools.Helper
 		/// <param name="single">True if all games should be replaced by '!', false otherwise</param>
 		/// <param name="root">String representing root directory to compare against for length calculation</param>
 		/// <param name="logger">Logging object for console and file output</param>
-		public static void Update(List<string> inputFileNames, Dat datdata, string outputDirectory, bool merge, bool diff, bool cascade, bool inplace,
+		public static void Update(List<string> inputFileNames, Dat datdata, string outputDirectory, bool merge, bool diff, bool? cascade, bool inplace,
 			bool skip, bool bare, bool clean, bool softlist, string gamename, string romname, string romtype, long sgt, long slt, long seq, string crc,
 			string md5, string sha1, bool? nodump, bool trim, bool single, string root, Logger logger)
 		{
@@ -1586,6 +1586,12 @@ namespace SabreTools.Helper
 					}
 				}
 
+				// If we're in inverse cascade, reverse the list
+				if (cascade == false)
+				{
+					newInputFileNames.Reverse();
+				}
+
 				// Create a dictionary of all ROMs from the input DATs
 				datdata.FileName = datdata.Description;
 				Dat userData;
@@ -1595,12 +1601,12 @@ namespace SabreTools.Helper
 				userData = Filter(userData, gamename, romname, romtype, sgt, slt, seq, crc, md5, sha1, nodump, trim, single, root, logger);
 
 				// Modify the Dictionary if necessary and output the results
-				if (diff && !cascade)
+				if (diff && cascade == null)
 				{
 					DiffNoCascade(outputDirectory, userData, newInputFileNames, logger);
 				}
 				// If we're in cascade and diff, output only cascaded diffs
-				else if (diff && cascade)
+				else if (diff && cascade != null)
 				{
 					DiffCascade(outputDirectory, inplace, userData, newInputFileNames, datHeaders, skip, logger);
 				}

SabreTools/Partials/SabreTools_Inits.cs

@@ -111,7 +111,7 @@ namespace SabreTools
 		/// /* Merging and Diffing info */
 		/// <param name="merge">True if input files should be merged into a single file, false otherwise</param>
 		/// <param name="diff">True if the input files should be diffed with each other, false otherwise</param>
-		/// <param name="cascade">True if the diffed files should be cascade diffed, false otherwise</param>
+		/// <param name="cascade">True if the diffed files should be cascade diffed, false if diffed files should be reverse cascaded, null otherwise</param>
 		/// <param name="inplace">True if the cascade-diffed files should overwrite their inputs, false otherwise</param>
 		/// <param name="skip">True if the first cascaded diff file should be skipped on output, false otherwise</param>
 		/// <param name="bare">True if the date should not be appended to the default name, false otherwise [OBSOLETE]</param>
@@ -174,7 +174,7 @@ namespace SabreTools
 			/* Merging and Diffing info */
 			bool merge,
 			bool diff,
-			bool cascade,
+			bool? cascade,
 			bool inplace,
 			bool skip,
 			bool bare,

SabreTools/SabreTools.cs

@@ -81,7 +81,6 @@ namespace SabreTools
 				add = false,
 				archivesAsFiles = false,
 				bare = false,
-				cascade = false,
 				clean = false,
 				datfromdir = false,
 				datprefix = false,
@@ -122,7 +121,8 @@ namespace SabreTools
 				skip = false,
 				update = false,
 				usegame = true;
-			bool? nodump = null;
+			bool? cascade = null,
+				nodump = null;
 			long sgt = -1,
 				slt = -1,
 				seq = -1;
@@ -335,6 +335,10 @@ namespace SabreTools
 					case "--roms":
 						usegame = false;
 						break;
+					case "-rc":
+					case "--rev-cascade":
+						cascade = false;
+						break;
 					case "-rm":
 					case "--remove":
 						rem = true;