/// <summary>
/// Handle Tab Input
/// </summary>
/// <param name="consoleInput"> Console Input </param>
private void HandleTabInput(ConsoleInput consoleInput)
{
// current input
string currentInput = consoleInput;
// check if input is already a part of the commands list
int indexOfInput = ListOfCommands.IndexOf(currentInput);
// match
string match;
// if input is a part of the commands list :
// then display the next command in alphabetical order
if (-1 != indexOfInput)
{
match = indexOfInput + 1 < ListOfCommands.Count() ? ListOfCommands[indexOfInput + 1] : "";
}
// if input isnt in the commands list, find the first match
else
{
match = ListOfCommands.FirstOrDefault(m => m.StartsWith(currentInput, true, CultureInfo.InvariantCulture));
}
// no match
if (string.IsNullOrEmpty(match))
{
return;
}
// clear line and current input
ClearCurrentLine();
consoleInput.Clear();
// set line and current input to the current match
Console.Write(match);
consoleInput.Append(match);
}
/// <summary>
/// Processes the user input which is not a tab
/// </summary>
/// <param name="consoleInput"> Console Input which stores the user input till now </param>
/// <param name="userInput"> the current user input </param>
private void HandleKeyInput(ConsoleInput consoleInput, ConsoleKeyInfo userInput)
{
// current input
string currentInput = consoleInput;
// Handle backspace
if (ConsoleKey.Backspace == userInput.Key)
{
// if user has pressed backspace, remove the last character from the console output and current input
if (currentInput.Length > 0 && consoleInput.CurrentIndex > 0)
{
var number = consoleInput.CurrentIndex > 0 ? consoleInput.CurrentIndex - 1 : 0;
consoleInput.Remove(number, 1);
// clear the line
ClearCurrentLine();
// remove from string and print on console
currentInput = consoleInput;
Console.Write(currentInput);
Terminal.SetCursorPosition(number, Console.CursorTop);
}
}
else if (ConsoleKey.UpArrow == userInput.Key)
{
ClearCurrentLine();
consoleInput.Clear();
currentInput = _commandHistory.GetPrevious();
consoleInput.Append(currentInput);
Console.Write($"{currentInput}");
}
else if (ConsoleKey.DownArrow == userInput.Key)
{
ClearCurrentLine();
consoleInput.Clear();
currentInput = _commandHistory.GetNext();
consoleInput.Append(currentInput);
Console.Write($"{currentInput}");
}
else if (ConsoleKey.LeftArrow == userInput.Key)
{
var number = consoleInput.CurrentIndex > 0 ? --consoleInput.CurrentIndex : 0;
Terminal.SetCursorPosition(number, Console.CursorTop);
}
else if (ConsoleKey.RightArrow == userInput.Key)
{
var number = consoleInput.CurrentIndex < consoleInput.Length? ++consoleInput.CurrentIndex : consoleInput.Length;
Terminal.SetCursorPosition(number, Console.CursorTop);
}
// all other keys
else
{
// To Lower is done because when we read a key using Console.ReadKey(),
// the uppercase is returned irrespective of the case of the user input.
var key = userInput.KeyChar;
consoleInput.Insert(key);
ClearCurrentLine();
Console.Write(consoleInput);
Terminal.SetCursorPosition(consoleInput.CurrentIndex, Console.CursorTop);
}
}