/// <summary>
/// Writes the prompt to the console.
/// </summary>
/// <param name="console">The console to write the prompt to.</param>
private void WritePrompt(IAnsiConsole console)
{
if (console is null)
{
throw new ArgumentNullException(nameof(console));
}
var builder = new StringBuilder();
builder.Append(_prompt.TrimEnd());
if (ShowChoices && Choices.Count > 0)
{
var choices = string.Join("/", Choices.Select(choice => TextPrompt <T> .GetTypeConverter().ConvertToInvariantString(choice)));
builder.AppendFormat(CultureInfo.InvariantCulture, " [blue][[{0}]][/]", choices);
}
if (ShowDefaultValue && DefaultValue != null)
{
builder.AppendFormat(
CultureInfo.InvariantCulture,
" [green]({0})[/]",
TextPrompt <T> .GetTypeConverter().ConvertToInvariantString(DefaultValue.Value));
}
var markup = builder.ToString().Trim();
if (!markup.EndsWith("?", StringComparison.OrdinalIgnoreCase) &&
!markup.EndsWith(":", StringComparison.OrdinalIgnoreCase))
{
markup += ":";
}
console.Markup(markup + " ");
}
private static bool TryConvert(string input, [MaybeNull] out T result)
{
try
{
result = (T)TextPrompt <T> .GetTypeConverter().ConvertFromInvariantString(input);
return(true);
}
catch
{
#pragma warning disable CS8601 // Possible null reference assignment.
result = default;
#pragma warning restore CS8601 // Possible null reference assignment.
return(false);
}
}
/// <summary>
/// Shows the prompt and requests input from the user.
/// </summary>
/// <param name="console">The console to show the prompt in.</param>
/// <returns>The user input converted to the expected type.</returns>
/// <inheritdoc/>
public T Show(IAnsiConsole console)
{
if (console is null)
{
throw new ArgumentNullException(nameof(console));
}
var promptStyle = PromptStyle ?? Style.Plain;
WritePrompt(console);
while (true)
{
var input = console.ReadLine(promptStyle, IsSecret);
// Nothing entered?
if (string.IsNullOrWhiteSpace(input))
{
if (DefaultValue != null)
{
console.Write(TextPrompt <T> .GetTypeConverter().ConvertToInvariantString(DefaultValue.Value), promptStyle);
console.WriteLine();
return(DefaultValue.Value);
}
if (!AllowEmpty)
{
continue;
}
}
console.WriteLine();
// Try convert the value to the expected type.
if (!TextPrompt <T> .TryConvert(input, out var result) || result == null)
{
console.MarkupLine(ValidationErrorMessage);
WritePrompt(console);
continue;
}
if (Choices.Count > 0)
{
if (Choices.Contains(result))
{
return(result);
}
else
{
console.MarkupLine(InvalidChoiceMessage);
WritePrompt(console);
continue;
}
}
// Run all validators
if (!ValidateResult(result, out var validationMessage))
{
console.MarkupLine(validationMessage);
WritePrompt(console);
continue;
}
return(result);
}
}