From d9c03fc0b071927ca4dedb3082f2570142b6863c Mon Sep 17 00:00:00 2001
From: Christian Rocha <christian@rocha.is>
Date: Tue, 16 Jun 2020 16:10:34 -0400
Subject: [PATCH] Add cursor positioning functions to viewport renderder

---
 viewport/renderer.go | 8 ++++++++
 viewport/viewport.go | 4 ++--
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/viewport/renderer.go b/viewport/renderer.go
index 2f1a9e6..8168225 100644
--- a/viewport/renderer.go
+++ b/viewport/renderer.go
@@ -95,3 +95,11 @@ func clearLine(w io.Writer) {
 func insertLine(w io.Writer, numLines int) {
 	fmt.Fprintf(w, te.CSI+"%dL", numLines)
 }
+
+func saveCursorPosition(w io.Writer) {
+	fmt.Fprint(w, te.CSI+"s")
+}
+
+func restoreCursorPosition(w io.Writer) {
+	fmt.Fprint(w, te.CSI+"u")
+}
diff --git a/viewport/viewport.go b/viewport/viewport.go
index d69a296..38511d1 100644
--- a/viewport/viewport.go
+++ b/viewport/viewport.go
@@ -21,8 +21,8 @@ type Model struct {
 	// It's used in high performance rendering.
 	Y int
 
-	// UseInternalRenderer specifies whether or not to use the pager's internal,
-	// high performance renderer to paint the screen.
+	// UseInternalRenderer specifies whether or not to use the pager's
+	// internal, high performance renderer to paint the screen.
 	UseInternalRenderer bool
 
 	lines []string