private int?HandleHelpOption(CommandInput commandInput,
IReadOnlyList <CommandSchema> availableCommandSchemas, CommandSchema targetCommandSchema)
{
// Help should be rendered if it was requested, or when executing a command which isn't defined
var shouldRenderHelp = commandInput.IsHelpOptionSpecified() || targetCommandSchema == null;
// If shouldn't render help, pass execution to the next handler
if (!shouldRenderHelp)
{
return(null);
}
// Keep track whether there was an error in the input
var isError = false;
// If target command isn't defined, find its contextual replacement
if (targetCommandSchema == null)
{
// If command was specified, inform the user that it's not defined
if (commandInput.IsCommandSpecified())
{
_console.WithForegroundColor(ConsoleColor.Red,
() => _console.Error.WriteLine($"Specified command [{commandInput.CommandName}] is not defined."));
isError = true;
}
// Replace target command with closest parent of specified command
targetCommandSchema = availableCommandSchemas.FindParent(commandInput.CommandName);
// If there's no parent, replace with stub default command
if (targetCommandSchema == null)
{
targetCommandSchema = CommandSchema.StubDefaultCommand;
availableCommandSchemas = availableCommandSchemas.Concat(CommandSchema.StubDefaultCommand).ToArray();
}
}
// Build help text source
var helpTextSource = new HelpTextSource(_metadata, availableCommandSchemas, targetCommandSchema);
// Render help text
_helpTextRenderer.RenderHelpText(_console, helpTextSource);
// Short-circuit with appropriate exit code
return(isError ? -1 : 0);
}
private int?HandleVersionOption(CommandInput commandInput)
{
// Version should be rendered if it was requested on a default command
var shouldRenderVersion = !commandInput.IsCommandSpecified() && commandInput.IsVersionOptionSpecified();
// If shouldn't render version, pass execution to the next handler
if (!shouldRenderVersion)
{
return(null);
}
// Render version text
_console.Output.WriteLine(_metadata.VersionText);
// Short-circuit with exit code 0
return(0);
}