From d89956a62697a9d7e9648a049011e8d3973e3ad0 Mon Sep 17 00:00:00 2001
From: Niklas Kapelle <niklas@kapelle.org>
Date: Fri, 19 Apr 2024 11:18:37 +0200
Subject: [PATCH] added scroll back to terminal

---
 src/bin/Terminal.hx | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/src/bin/Terminal.hx b/src/bin/Terminal.hx
index 6d00df8..d16be44 100644
--- a/src/bin/Terminal.hx
+++ b/src/bin/Terminal.hx
@@ -1,5 +1,6 @@
 package bin;
 
+import lib.MathI;
 import kernel.EndOfLoop;
 import lua.NativeStringTools;
 import kernel.binstore.BinStore;
@@ -25,6 +26,8 @@ class Terminal implements IProcess {
 	private var history:Array<String> = [];
 	private var historyIndex:Int = 0;
 
+	private var scrollBack = 0;
+
 	private var runningPID:PID = -1;
 
 	public function new() {}
@@ -61,6 +64,7 @@ class Terminal implements IProcess {
 					this.backlog.push("> " + this.input);
 					var command = this.input;
 					this.input = "";
+					this.scrollBack = 0;
 					this.requestRender();
 					this.historyIndex = 0;
 					this.invokeCommand(command);
@@ -72,6 +76,12 @@ class Terminal implements IProcess {
 						this.input = this.history[this.history.length - this.historyIndex];
 						this.requestRender();
 					}
+				case 266: // PAGE UP
+					this.scrollBack = MathI.min(scrollBack + 1, this.backlog.length - 1);
+					this.requestRender();
+				case 267: // PAGE DOWN
+					this.scrollBack = MathI.max(scrollBack - 1, 0);
+					this.requestRender();
 			}
 		}));
 
@@ -99,7 +109,8 @@ class Terminal implements IProcess {
 		var size = this.ctx.getSize();
 		var linesAvailable = size.y - 1;
 
-		var start:Int = this.backlog.length - linesAvailable;
+		var withoutScrollBack = (this.backlog.length - linesAvailable);
+		var start:Int = withoutScrollBack - scrollBack;
 
 		for (i in 0...linesAvailable) {
 			var line = this.backlog[start + i];