From 826db2d718e1ed515eaa40c2d731f827fa8b67db Mon Sep 17 00:00:00 2001
From: Nathan Byrd <techy1@gmail.com>
Date: Wed, 20 Sep 2023 23:00:32 +0000
Subject: [PATCH] Added scrolling.

---
 core/ansi_escape_parser.js | 14 ++++++++++++++
 core/art.js                |  6 ++++++
 2 files changed, 20 insertions(+)

diff --git a/core/ansi_escape_parser.js b/core/ansi_escape_parser.js
index 55dc9a82..974399c8 100644
--- a/core/ansi_escape_parser.js
+++ b/core/ansi_escape_parser.js
@@ -86,6 +86,20 @@ function ANSIEscapeParser(options) {
     };
 
     self.positionUpdated = function () {
+        if(self.row > self.termHeight) {
+            if(this.savedPosition) {
+                this.savedPosition.row -= self.row - self.termHeight;
+            }
+            self.emit('scroll', self.row - self.termHeight);
+            self.row = self.termHeight;
+        }
+        else if(self.row < 1) {
+            if(this.savedPosition) {
+                this.savedPosition.row -= self.row - 1;
+            }
+            self.emit('scroll', -(self.row - 1));
+            self.row = 1;
+        }
         self.emit('position update', self.row, self.column);
     };
 
diff --git a/core/art.js b/core/art.js
index 2145f5ad..f6c0c4d9 100644
--- a/core/art.js
+++ b/core/art.js
@@ -316,6 +316,12 @@ function display(client, art, options, cb) {
         }
     });
 
+    ansiParser.on('scroll', (scrollY) => {
+        _.forEach(mciMap, (mciInfo) => {
+            mciInfo.position[0] -= scrollY;
+        });
+    });
+
     ansiParser.on('literal', literal => client.term.write(literal, false));
     ansiParser.on('control', control => client.term.rawWrite(control));