private static CHAR_INFO[] CreateCompletionMenu(System.Collections.ObjectModel.Collection <CompletionResult> matches, IConsole console, bool showToolTips, string currentCompletionText, out int currentCompletionIndex, out int MenuColumnWidth, out int DisplayRows)
{
var minColWidth = matches.Max(c => c.ListItemText.Length);
minColWidth += 2;
var bufferWidth = console.BufferWidth;
var displayColumns = Math.Max(1, bufferWidth / minColWidth);
currentCompletionIndex = 0;
ConsoleBufferBuilder cb;
if (displayColumns == 1 || showToolTips)
{
const string seperator = "- ";
var maxTooltipWidth = bufferWidth - minColWidth - seperator.Length;
// switch off tooltips if it too short
if (maxTooltipWidth < 5)
{
minColWidth = bufferWidth;
showToolTips = false;
}
DisplayRows = matches.Count;
cb = new ConsoleBufferBuilder(DisplayRows * bufferWidth, console);
for (int index = 0; index < matches.Count; index++)
{
var match = matches[index];
if (match.CompletionText.Equals(currentCompletionText))
{
currentCompletionIndex = index;
}
var listItemText = ShortenLongCompletions(HandleNewlinesForPossibleCompletions(match.ListItemText), minColWidth);
cb.Append(listItemText);
var spacesNeeded = minColWidth - listItemText.Length;
if (spacesNeeded > 0)
{
cb.Append(' ', spacesNeeded);
}
if (showToolTips)
{
cb.Append(seperator);
var toolTip = HandleNewlinesForPossibleCompletions(match.ToolTip);
toolTip = toolTip.Length <= maxTooltipWidth
? toolTip
: toolTip.Substring(0, maxTooltipWidth);
cb.Append(toolTip);
}
// Make sure we always write out exactly 1 buffer width
spacesNeeded = (bufferWidth * (index + 1)) - cb.Length;
if (spacesNeeded > 0)
{
cb.Append(' ', spacesNeeded);
}
}
MenuColumnWidth = bufferWidth;
}
else
{
DisplayRows = (matches.Count + displayColumns - 1) / displayColumns;
cb = new ConsoleBufferBuilder(DisplayRows * bufferWidth, console);
for (var row = 0; row < DisplayRows; row++)
{
for (var col = 0; col < displayColumns; col++)
{
var index = row + (DisplayRows * col);
if (index >= matches.Count)
{
break;
}
var match = matches[index];
if (match.CompletionText.Equals(currentCompletionText))
{
currentCompletionIndex = index;
}
var item = HandleNewlinesForPossibleCompletions(match.ListItemText);
cb.Append(item);
cb.Append(' ', minColWidth - item.Length);
}
// Make sure we always write out exactly 1 buffer width
var spacesNeeded = (bufferWidth * (row + 1)) - cb.Length;
if (spacesNeeded > 0)
{
cb.Append(' ', spacesNeeded);
}
}
MenuColumnWidth = minColWidth;
}
return(cb.ToArray());
}