From 6ca4f2e08d323b26940704eca89bdc71b4ed0160 Mon Sep 17 00:00:00 2001
From: Florrie <towerofnix@gmail.com>
Date: Fri, 25 Jan 2019 09:10:14 -0400
Subject: Expose xterm alternate screen

---
 util/ansi.js | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

(limited to 'util/ansi.js')

diff --git a/util/ansi.js b/util/ansi.js
index e7f7642..f30e6ff 100644
--- a/util/ansi.js
+++ b/util/ansi.js
@@ -123,6 +123,20 @@ const ansi = {
     return `${ESC}[6n`
   },
 
+  enableAlternateScreen() {
+    // Enables alternate screen:
+    // "Xterm maintains two screen buffers.  The normal screen buffer allows
+    // you to scroll back to view saved lines of output up to the maximum set
+    // by the saveLines resource.  The alternate screen buffer is exactly as
+    // large as the display, contains no additional saved lines."
+
+    return `${ESC}[?1049h`
+  },
+
+  disableAlternateScreen() {
+    return `${ESC}[?1049l`
+  },
+
   measureColumns(text) {
     // Returns the number of columns the given text takes.
 
-- 
cgit 1.3.0-6-gf8a5