/// <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 converter = Converter ?? TypeConverterHelper.ConvertToString;
var choices = string.Join("/", Choices.Select(choice => converter(choice)));
builder.AppendFormat(CultureInfo.InvariantCulture, " [blue][[{0}]][/]", choices);
}
if (ShowDefaultValue && DefaultValue != null)
{
builder.AppendFormat(
CultureInfo.InvariantCulture,
" [green]({0})[/]",
TypeConverterHelper.ConvertToString(DefaultValue.Value));
}
var markup = builder.ToString().Trim();
if (!markup.EndsWith("?", StringComparison.OrdinalIgnoreCase) &&
!markup.EndsWith(":", StringComparison.OrdinalIgnoreCase))
{
markup += ":";
}
console.Markup(markup + " ");
}
/// <inheritdoc/>
public async Task <T> ShowAsync(IAnsiConsole console, CancellationToken cancellationToken)
{
if (console is null)
{
throw new ArgumentNullException(nameof(console));
}
return(await console.RunExclusive(async() =>
{
var promptStyle = PromptStyle ?? Style.Plain;
var converter = Converter ?? TypeConverterHelper.ConvertToString;
var choices = Choices.Select(choice => converter(choice)).ToList();
var choiceMap = Choices.ToDictionary(choice => converter(choice), choice => choice, _comparer);
WritePrompt(console);
while (true)
{
var input = await console.ReadLine(promptStyle, IsSecret, choices, cancellationToken).ConfigureAwait(false);
// Nothing entered?
if (string.IsNullOrWhiteSpace(input))
{
if (DefaultValue != null)
{
console.Write(IsSecret ? "******" : converter(DefaultValue.Value), promptStyle);
console.WriteLine();
return DefaultValue.Value;
}
if (!AllowEmpty)
{
continue;
}
}
console.WriteLine();
T?result;
if (Choices.Count > 0)
{
if (choiceMap.TryGetValue(input, out result) && result != null)
{
return result;
}
else
{
console.MarkupLine(InvalidChoiceMessage);
WritePrompt(console);
continue;
}
}
else if (!TypeConverterHelper.TryConvertFromString <T>(input, out result) || result == null)
{
console.MarkupLine(ValidationErrorMessage);
WritePrompt(console);
continue;
}
// Run all validators
if (!ValidateResult(result, out var validationMessage))
{
console.MarkupLine(validationMessage);
WritePrompt(console);
continue;
}
return result;
}
}).ConfigureAwait(false));
}