void ProcessOneKey(PSKeyInfo key, Dictionary <PSKeyInfo, KeyHandler> dispatchTable, bool ignoreIfNoAction, object arg)
{
var consoleKey = key.AsConsoleKeyInfo();
// Our dispatch tables are built as much as possible in a portable way, so for example,
// we avoid depending on scan codes like ConsoleKey.Oem6 and instead look at the
// PSKeyInfo.Key. We also want to ignore the shift state as that may differ on
// different keyboard layouts.
//
// That said, we first look up exactly what we get from Console.ReadKey - that will fail
// most of the time, and when it does, we normalize the key.
if (!dispatchTable.TryGetValue(key, out var handler))
{
// If we see a control character where Ctrl wasn't used but shift was, treat that like
// shift hadn't be pressed. This cleanly allows Shift+Backspace without adding a key binding.
if (key.Shift && !key.Control && !key.Alt)
{
var c = consoleKey.KeyChar;
if (c != '\0' && char.IsControl(c))
{
key = PSKeyInfo.From(consoleKey.Key);
dispatchTable.TryGetValue(key, out handler);
}
}
}
if (handler != null)
{
if (handler.ScriptBlock != null)
{
CallPossibleExternalApplication(() => handler.Action(consoleKey, arg));
}
else
{
handler.Action(consoleKey, arg);
}
}
else if (!ignoreIfNoAction)
{
SelfInsert(consoleKey, arg);
}
}
static PSKeyInfo Key(ConsoleKey key) => PSKeyInfo.From(key);
static PSKeyInfo Key(char c) => PSKeyInfo.From(c);