/// <summary>
/// Before PowerArgs parses the args, this hook inspects the command line for the indicator and if found
/// takes over the command line and provides tab completion.
/// </summary>
/// <param name="context">The context used to inspect the command line arguments.</param>
public override void BeforeParse(ArgHook.HookContext context)
{
if (Indicator == "" && context.CmdLineArgs.Length != 0)
{
return;
}
else if (Indicator != "" && (context.CmdLineArgs.Length != 1 || context.CmdLineArgs[0] != Indicator))
{
return;
}
var existingColor = Console.ForegroundColor;
Console.ForegroundColor = ConsoleColor.Cyan;
try
{
if (REPL && ShowREPLWelcome)
{
Console.WriteLine();
var message = REPLWelcomeMessage.Replace("{{Indicator}}", REPLExitIndicator);
Console.WriteLine(message);
Console.WriteLine();
Console.Write(Indicator + "> ");
ShowREPLWelcome = false;
}
else if (REPL)
{
Console.Write(Indicator + "> ");
}
else
{
// This is a little hacky, but I could not find a better way to make the tab completion start on the same lime
// as the command line input
try
{
var lastLine = StdConsoleProvider.ReadALineOfConsoleOutput(Console.CursorTop - 1);
Console.CursorTop--;
Console.WriteLine(lastLine);
Console.CursorTop--;
Console.CursorLeft = lastLine.Length + 1;
}
catch (Exception)
{
Console.WriteLine();
Console.Write(Indicator + "> ");
}
}
}
finally
{
Console.ForegroundColor = existingColor;
}
List <string> completions = FindTabCompletions(context.Definition.Arguments, context.Definition.Actions);
List <ITabCompletionSource> completionSources = new List <ITabCompletionSource>();
if (this.completionSource != null)
{
completionSources.Add((ITabCompletionSource)Activator.CreateInstance(this.completionSource));
}
completionSources.Add(new EnumTabCompletionSource(context.Definition));
completionSources.Add(new SimpleTabCompletionSource(completions)
{
MinCharsBeforeCyclingBegins = 0
});
completionSources.Add(new FileSystemTabCompletionSource());
string str = null;
var newCommandLine = ConsoleHelper.ReadLine(ref str, LoadHistory(), new MultiTabCompletionSource(completionSources));
if (REPL && newCommandLine.Length == 1 && string.Equals(newCommandLine[0], REPLExitIndicator, StringComparison.OrdinalIgnoreCase))
{
throw new REPLExitException();
}
if (REPL && newCommandLine.Length == 1 && newCommandLine[0] == "cls")
{
ConsoleHelper.ConsoleImpl.Clear();
throw new REPLContinueException();
}
else if (REPL && newCommandLine.Length == 0 && string.IsNullOrWhiteSpace(REPLExitIndicator) == false)
{
throw new REPLContinueException();
}
context.CmdLineArgs = newCommandLine;
AddToHistory(str);
}