public void Run()
{
_commands = LoadConsoleCommands();
Vt100.SwitchToAlternateBuffer();
Vt100.HideCursor();
InitializeScreen();
using (_repository)
{
while (!_done)
{
var width = Console.WindowWidth;
var height = Console.WindowHeight;
var key = Console.ReadKey(true);
var command = _commands.FirstOrDefault(c => c.MatchesKey(key));
command?.Execute();
if (width != Console.WindowWidth || height != Console.WindowHeight)
{
InitializeScreen();
}
}
Vt100.ResetScrollMargins();
Vt100.SwitchToMainBuffer();
Vt100.ShowCursor();
}
}
private void InitializeScreen()
{
var oldView = _view;
_header = new Label(0, 0, Console.WindowWidth);
_header.Foreground = ConsoleColor.Yellow;
_header.Background = ConsoleColor.DarkGray;
_view = new View(1, 0, Console.WindowHeight - 1, Console.WindowWidth);
_view.SelectedLineChanged += delegate { UpdateHeader(); };
_footer = new Label(Console.WindowHeight - 1, 0, Console.WindowWidth);
_footer.Foreground = ConsoleColor.Yellow;
_footer.Background = ConsoleColor.DarkGray;
Vt100.SetScrollMargins(2, Console.WindowHeight - 1);
UpdateRepository();
if (oldView != null)
{
_view.VisibleWhitespace = oldView.VisibleWhitespace;
_view.SelectedLine = oldView.SelectedLine;
_view.BringIntoView(_view.SelectedLine);
}
}
protected void RenderLine(View view, int lineIndex, string line, ConsoleColor foregroundColor, ConsoleColor backgroundColor)
{
var textStart = Math.Min(view.LeftChar, line.Length);
var textLength = Math.Max(Math.Min(view.Width, line.Length - view.LeftChar), 0);
var text = textLength < 0 ? string.Empty : line.ToVisual(view.VisibleWhitespace).Substring(textStart, textLength);
var visualLine = lineIndex - view.TopLine + view.Top;
Vt100.SetCursorPosition(view.Left, visualLine);
Vt100.SetForegroundColor(foregroundColor);
Vt100.SetBackgroundColor(backgroundColor);
Vt100.EraseRestOfCurrentLine();
Console.Write(text);
if (view.SearchResults != null)
{
foreach (var hit in view.SearchResults.Hits)
{
if (hit.LineIndex == lineIndex)
{
var hitStart = Math.Min(Math.Max(hit.Start - view.LeftChar, 0), view.Width - 1) + view.LeftChar;
var hitEnd = Math.Min(Math.Max(hit.Start + hit.Length - view.LeftChar, 0), view.Width - 1) + view.LeftChar;
var hitLength = hitEnd - hitStart;
if (hitLength > 0)
{
Vt100.SetCursorPosition(hitStart - view.LeftChar, visualLine);
Vt100.NegativeColors();
Console.Write(line.Substring(hitStart, hitLength));
Vt100.PositiveColors();
}
}
}
}
}
private void RenderNonExistingLine(int visualLine)
{
Vt100.SetCursorPosition(0, visualLine);
Vt100.SetForegroundColor(ConsoleColor.DarkGray);
Vt100.SetBackgroundColor(ConsoleColor.Black);
Console.Write("~");
Console.Write(_blankRow, 0, Width - 1);
}
private void Render()
{
var textLength = Math.Min(_text.Length, _width);
var text = _text.Substring(0, textLength);
Vt100.SetCursorPosition(_left, _top);
Vt100.SetForegroundColor(_foreground);
Vt100.SetBackgroundColor(_background);
Vt100.EraseRestOfCurrentLine();
Console.Write(text);
}
private void UpdateTopLine(int value)
{
if (_topLine == value)
{
return;
}
if (value < 0 || value >= DocumentHeight)
{
throw new ArgumentOutOfRangeException(nameof(value));
}
var delta = value - _topLine;
_topLine = value;
if (Math.Abs(delta) >= Height)
{
Render();
}
else
{
if (delta < 0)
{
// We need to scroll up by -delta lines.
Vt100.ScrollDown(Math.Abs(delta));
for (var i = 0; i < -delta; i++)
{
var line = _topLine + i;
RenderLine(line);
}
}
else
{
// We need to scroll down by delta lines.
var visualLineCount = Height - delta;
Vt100.ScrollUp(delta);
for (var i = 0; i < delta; i++)
{
var line = _topLine + visualLineCount + i;
RenderLine(line);
}
}
}
TopLineChanged?.Invoke(this, EventArgs.Empty);
}
private void Search()
{
var sb = new StringBuilder();
while (true)
{
Vt100.HideCursor();
Vt100.SetCursorPosition(0, Console.WindowHeight - 1);
Vt100.SetForegroundColor(ConsoleColor.Blue);
Vt100.SetBackgroundColor(ConsoleColor.Gray);
Console.Write("/");
Vt100.EraseRestOfCurrentLine();
Console.Write(sb);
Vt100.ShowCursor();
var k = Console.ReadKey(intercept: true);
if (k.Key == ConsoleKey.Enter)
{
break;
}
else if (k.Key == ConsoleKey.Escape)
{
sb.Clear();
break;
}
else if (k.Key == ConsoleKey.Backspace)
{
if (sb.Length > 0)
{
sb.Length--;
}
}
else if (k.KeyChar >= 32)
{
sb.Append(k.KeyChar);
if (sb.Length == Console.WindowWidth - 1)
{
break;
}
}
}
Vt100.HideCursor();
UpdateFooter();
if (sb.Length == 0)
{
return;
}
var searchResults = new SearchResults(_view.Document, sb.ToString());
if (searchResults.Hits.Count == 0)
{
Vt100.HideCursor();
Vt100.SetCursorPosition(0, Console.WindowHeight - 1);
Vt100.SetForegroundColor(ConsoleColor.Blue);
Vt100.SetBackgroundColor(ConsoleColor.Gray);
Vt100.EraseRestOfCurrentLine();
Console.Write("<< NO RESULTS FOUND >>");
Console.ReadKey();
UpdateFooter();
return;
}
_view.SearchResults = searchResults;
_view.SelectedLine = searchResults.Hits.First().LineIndex;
}
