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Minimize writing ANSI escape sequences in PSReadline (#4110)

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Instead of changing Console.*groundColor on every character, only set
the color when the color changes - this avoids writing out ANSI escape
sequences after every character.

Fixes #4075
This commit is contained in:
Jason Shirk
2017-06-27 23:22:16 -07:00
committed by GitHub
parent 27e47f9ee1
commit ff5609785b
1 changed files with 20 additions and 4 deletions
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src/Microsoft.PowerShell.PSReadLine/ConsoleLib.cs
+20 -4
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@@ -1068,17 +1068,33 @@ namespace Microsoft.PowerShell.Internal
Console.SetCursorPosition(0, (top>=0) ? top : 0);
var lastForegroundColor = (ConsoleColor)(-1);
var lastBackgroundColor = (ConsoleColor)(-1);
for (int i = 0; i < buffer.Length; ++i)
{
// TODO: use escape sequences for better perf
Console.ForegroundColor = buffer[i].ForegroundColor;
Console.BackgroundColor = buffer[i].BackgroundColor;
var nextForegroundColor = buffer[i].ForegroundColor;
var nextBackgroundColor = buffer[i].BackgroundColor;
if (nextForegroundColor != lastForegroundColor)
{
Console.ForegroundColor = lastForegroundColor = nextForegroundColor;
}
if (nextBackgroundColor != lastBackgroundColor)
{
Console.BackgroundColor = lastBackgroundColor = nextBackgroundColor;
}
Console.Write(buffer[i].UnicodeChar);
}
Console.BackgroundColor = backgroundColor;
Console.ForegroundColor = foregroundColor;
if (foregroundColor != lastForegroundColor)
{
Console.ForegroundColor = foregroundColor;
}
if (backgroundColor != lastBackgroundColor)
{
Console.BackgroundColor = backgroundColor;
}
}
public void ScrollBuffer(int lines)