Add ExpectedAsSinglePathToExistingDirectoryOrFile

src/TreeBasedCli/Commands/Leaf/WithArguments/IUserInputToCommandOption.cs

@@ -48,6 +48,13 @@ public interface IUserInputToCommandOption
  /// </summary>
  string ExpectedAsSinglePathToExistingDirectory();
 
+ /// <summary>
+ /// Gets the single value of this argument, interpreted as a path to an existing file or directory.
+ /// This method throws a <see cref="WrongCommandUsageException" /> if the number of values is not equal to 1.
+ /// It throws a <see cref="MessageOnlyException" /> if no file or directory exists at the specified path.
+ /// </summary>
+ string ExpectedAsSinglePathToExistingDirectoryOrFile();
+
  /// <summary>
  /// Gets the single value of this argument, interpreted as an integer.
  /// This method throws a <see cref="WrongCommandUsageException" /> if the number of values is not equal to 1.

src/TreeBasedCli/Commands/Leaf/WithArguments/UserInputToCommandOption.cs

@@ -77,6 +77,20 @@ public string ExpectedAsSinglePathToExistingDirectory()
  return path;
  }
 
+ /// <inheritdoc cref="IUserInputToCommandOption.ExpectedAsSinglePathToExistingDirectoryOrFile" />
+ public string ExpectedAsSinglePathToExistingDirectoryOrFile()
+ {
+ string path = this.ExpectedAsSingleValue();
+
+ if (!File.Exists(path) && !Directory.Exists(path))
+ {
+ ThrowHelper.MessageOnlyException(
+ $"The file or directory '{path}' does not exist.");
+ }
+
+ return path;
+ }
+
  /// <inheritdoc cref="IUserInputToCommandOption.ExpectedAsSingleInteger" />
  public int ExpectedAsSingleInteger()
  {

src/TreeBasedCli/TreeBasedCli.nuspec

@@ -2,7 +2,7 @@
 <package xmlns="http://schemas.microsoft.com/packaging/2010/07/nuspec.xsd">
  <metadata>
  <id>TreeBasedCli</id>
- <version>3.2.5</version>
+ <version>3.2.6</version>
  <authors>Patryk Golebiowski</authors>
  <owners>Patryk Golebiowski</owners>