Add CLI for MP3 extraction

Author: Meerkov

src/BizHawk.Client.DiscoHawk/MainDiscoForm.cs

@@ -122,9 +122,9 @@ private void LblMp3ExtractMagicArea_DragDrop(object sender, DragEventArgs e)
 				using var disc = Disc.LoadAutomagic(file);
 				var path = Path.GetDirectoryName(file);
 				var filename = Path.GetFileNameWithoutExtension(file);
-				static bool? PromptForOverwrite()
+				static bool? PromptForOverwrite(string mp3Path)
 					=> MessageBox.Show(
-						"Do you want to overwrite existing files? Choosing \"No\" will simply skip those. You could also \"Cancel\" the extraction entirely.",
+						$"Do you want to overwrite existing files? Choosing \"No\" will simply skip those. You could also \"Cancel\" the extraction entirely.\n\ncaused by file: {mp3Path}",
 						"File to extract already exists",
 						MessageBoxButtons.YesNoCancel) switch
 					{

src/BizHawk.Emulation.DiscSystem/DiscoHawkLogic/AudioExtractor.cs

@@ -9,7 +9,7 @@ namespace BizHawk.Client.DiscoHawk
 {
 	public static class AudioExtractor
 	{
-		public static void Extract(Disc disc, string path, string fileBase, Func<bool?> getOverwritePolicy)
+		public static void Extract(Disc disc, string path, string fileBase, Func<string, bool?> getOverwritePolicy)
 		{
 			var dsr = new DiscSectorReader(disc);
 
@@ -36,7 +36,7 @@ public static void Extract(Disc disc, string path, string fileBase, Func<bool?>
 				var mp3Path = $"{Path.Combine(path, fileBase)} - Track {track.Number:D2}.mp3";
 				if (File.Exists(mp3Path))
 				{
-					overwriteExisting ??= getOverwritePolicy();
+					overwriteExisting ??= getOverwritePolicy(mp3Path);
 					switch (overwriteExisting)
 					{
 						case true: // "Yes" -- overwrite

src/BizHawk.Emulation.DiscSystem/DiscoHawkLogic/DiscoHawkLogic.cs

@@ -4,6 +4,8 @@
 using System.Threading;
 using System.Threading.Tasks;
 
+using BizHawk.Client.DiscoHawk;
+
 namespace BizHawk.Emulation.DiscSystem
 {
 	/// <remarks>
@@ -267,7 +269,8 @@ public static void RunWithArgs(string[] args, Action<string> showComparisonResul
 			var loadDiscInterface = DiscInterface.BizHawk;
 			var compareDiscInterfaces = new List<DiscInterface>();
 			bool hawk = false;
-
+			bool music = false;
+			bool overwrite = false;
 			int idx = 0;
 			while (idx < args.Length)
 			{
@@ -284,6 +287,14 @@ public static void RunWithArgs(string[] args, Action<string> showComparisonResul
 					dirArg = args[idx++];
 					scanCues = true;
 				}
+				else if (au is "MUSIC")
+				{
+					music = true;
+				}
+				else if (au is "OVERWRITE")
+				{
+					overwrite = true;
+				}
 				else infile = a;
 			}
 
@@ -296,6 +307,21 @@ public static void RunWithArgs(string[] args, Action<string> showComparisonResul
 					discInterface: loadDiscInterface);
 			}
 
+			if (music)
+			{
+				if (infile is null) return;
+				using var disc = Disc.LoadAutomagic(infile);
+				var path = Path.GetDirectoryName(infile);
+				var filename = Path.GetFileNameWithoutExtension(infile);
+				bool? CheckOverwrite(string mp3Path)
+				{
+					if (overwrite) return true; // overwrite
+					Console.WriteLine($"{mp3Path} already exists. Remove existing output files, or retry with the extra argument \"OVERWRITE\".");
+					return null; // cancel
+				}
+				AudioExtractor.Extract(disc, path, filename, CheckOverwrite);
+			}
+
 			bool verbose = true;
 
 			if (scanCues)