public static void StartAppLoop(ICliCommand[] commands, ILeafCliCommand quitCommand)
{
Cmd.WriteHeader("Ready");
Cmd.WriteLine("'?' for help");
Type currentCommandType = null;
do
{
var path = GetCommandInheritanceChain(currentCommandType, commands)
.Reverse()
.Aggregate(string.Empty, (current, commandType) => $"{current}.{commandType.Name.Replace("Command", string.Empty)}");
if (path.StartsWith("."))
{
path = path.Substring(1);
}
var prompt = Cmd.Prompt($".{path}");
var type = currentCommandType;
var childCommands = commands.Where(x => x.ParentCommandType == type)
.Union(new[] { quitCommand });
if (prompt.IsRoughly("?", "help"))
{
ShowHelp(childCommands, currentCommandType != null);
continue;
}
if (prompt.IsRoughly(".."))
{
if (currentCommandType != null)
{
var currentCommand = commands.Single(x => x.GetType() == currentCommandType);
currentCommandType = commands.Where(x => x.GetType() == currentCommand.ParentCommandType)
.Select(x => x.GetType())
.SingleOrDefault();
}
continue;
}
var command = childCommands.SingleOrDefault(x => x.CanHandle(prompt));
if (command == null)
{
Cmd.WriteWarningLine("Command not recognised");
continue;
}
if (command is ILeafCliCommand)
{
try
{
(command as ILeafCliCommand).Execute(prompt).Wait();
}
catch (Exception ex)
{
Cmd.WriteException(ex);
}
}
else
{
currentCommandType = command.GetType();
}
} while (true);
// ReSharper disable once FunctionNeverReturns
}
private static IEnumerable<Type> GetCommandInheritanceChain(Type currentType, ICliCommand[] commands)
{
while (true)
{
if (currentType == null)
{
yield break;
}
yield return currentType;
var currentCommand = commands.Single(x => x.GetType() == currentType);
currentType = currentCommand.ParentCommandType;
}
}