Remove multispace instances from template filenames (#637)

Source/LibationFileManager/Templates.cs

@@ -179,6 +179,7 @@ namespace LibationFileManager
 				while((slashIndex = part.IndexOf(Path.DirectorySeparatorChar, lastIndex)) > -1)
 				{
 					dir.Add(part[lastIndex..slashIndex]);
+					RemoveSpaces(dir);
 					directories.Add(dir);
 					dir = new();
 
@@ -186,11 +187,57 @@ namespace LibationFileManager
 				}
 				dir.Add(part[lastIndex..]);
 			}
+			RemoveSpaces(dir);
 			directories.Add(dir);
 
 			return directories;
 		}
 
+		/// <summary>
+		/// Remove spaces from the filename parts to ensure that after concatenation
+		/// <br>-</br> There is no leading or trailing white space
+		/// <br>-</br> There are no multispace instances
+		/// </summary>
+		private static void RemoveSpaces(List<string> parts)
+		{
+			while (parts.Count > 0 && string.IsNullOrWhiteSpace(parts[0]))
+				parts.RemoveAt(0);
+
+			while (parts.Count > 0 && string.IsNullOrWhiteSpace(parts[^1]))
+				parts.RemoveAt(parts.Count - 1);
+
+			if (parts.Count == 0) return;
+
+			parts[0] = parts[0].TrimStart();
+			parts[^1] = parts[^1].TrimEnd();
+
+			//Replace all multispace substrings with single space
+			for (int i = 0; i < parts.Count; i++)
+			{
+				string original;
+				do
+				{
+					original = parts[i];
+					parts[i] = original.Replace("  ", " ");
+				}while(original.Length != parts[i].Length);
+			}
+
+			//Remove instances of double spaces at part boundaries
+			for (int i = 1; i < parts.Count; i++)
+			{
+				if (parts[i - 1].EndsWith(' ') && parts[i].StartsWith(' '))
+				{
+					parts[i] = parts[i].Substring(1);
+
+					if (parts[i].Length == 0)
+					{
+						parts.RemoveAt(i);
+						i--;
+					}
+				}
+			}
+		}
+
 		#endregion
 
 		#region Registered Template Properties

Source/_Tests/LibationFileManager.Tests/TemplatesTests.cs

@@ -107,6 +107,42 @@ namespace TemplatesTests
 				.Should().Be(expected);
 		}
 
+		[TestMethod]
+		[DataRow("<samplerate>", "", "", "100")]
+		[DataRow(" <samplerate> ", "", "", "100")]
+		[DataRow("4<samplerate>4", "", "", "100")]
+		[DataRow("<bitrate>   -   <bitrate>", "", "", "1 8 - 1 8")]
+		[DataRow("<bitrate>   42   <bitrate>", "", "", "1 8 1 8")]
+		[DataRow(" <bitrate> - <bitrate> ", "", "", "1 8 - 1 8")]
+		[DataRow("4<bitrate> - <bitrate> 4", "", "", "1 8 - 1 8")]
+		[DataRow("4<bitrate> - <bitrate> 4", "", "", "1 8 - 1 8")]
+		[DataRow("<channels><channels><samplerate><channels><channels>", "", "", "100")]
+		[DataRow(" <channels> <channels> <samplerate> <channels> <channels>", "", "", "100")]
+		[DataRow(" <channels> - <channels> <samplerate> <channels> - <channels>", "", "", "- 100 -")]
+
+		public void Tests_removeSpaces(string template, string dirFullPath, string extension, string expected)
+		{
+			if (Environment.OSVersion.Platform is not PlatformID.Win32NT)
+			{
+				dirFullPath = dirFullPath.Replace("C:", "").Replace('\\', '/');
+				expected = expected.Replace("C:", "").Replace('\\', '/');
+			}
+			var replacements
+				= new ReplacementCharacters
+				{
+					Replacements = Replacements.Replacements
+					.Append(new Replacement('4', "  ", ""))
+					.Append(new Replacement('2', "  ", ""))
+					.ToArray() };
+
+			Templates.TryGetTemplate<Templates.FileTemplate>(template, out var fileTemplate).Should().BeTrue();
+
+			fileTemplate
+				.GetFilename(GetLibraryBook(), dirFullPath, extension, replacements)
+				.PathWithoutPrefix
+				.Should().Be(expected);
+		}
+
 		[TestMethod]
 		[DataRow("<bitrate>Kbps <samplerate>Hz", "128Kbps 44100Hz")]
 		[DataRow("<bitrate>Kbps <samplerate[6]>Hz", "128Kbps 044100Hz")]