From ff52420876fb4e9a2d205d5a819db0234fc36b89 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Gustav=20S=C3=B6rn=C3=A4s?= <gustav@sornas.net>
Date: Tue, 4 May 2021 00:00:46 +0200
Subject: wip buffer for less flashing

---
 src/window.rs | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/src/window.rs b/src/window.rs
index baabc30..809ac4d 100644
--- a/src/window.rs
+++ b/src/window.rs
@@ -18,7 +18,7 @@ pub enum Line {
 }
 
 pub fn truncate_dots(s: &str, to: usize) -> String {
-    //TODO We don't have time to do this every tick
+    //TODO Don't do this every tick
     let graphemes = s.graphemes(true).collect::<Vec<_>>();
     if graphemes.len() >= to {
         format!("{}...", graphemes.iter().take(to - 3).fold(String::new(), |acc, s| format!("{}{}", acc, s)))
@@ -41,16 +41,17 @@ impl Window {
     }
 
     pub fn draw<W: Write>(&mut self, out: &mut W, area: Area) -> Result<(), std::io::Error> {
+        let mut buffer = Vec::new();
         let mut y = area.y;
         let mut lines = self.lines.iter().skip(self.scroll);
         while y < area.h + 1 {
             match lines.next() {
                 Some(line) => {
-                    write!(out, "{}", cursor::Goto(area.x, y))?;
+                    write!(buffer, "{}", cursor::Goto(area.x, y))?;
                     match line {
-                        Line::Normal(s) => write!(out, "{}", truncate_dots(s, area.w as usize))?,
+                        Line::Normal(s) => write!(buffer, "{}", truncate_dots(s, area.w as usize))?,
                         Line::Highlight(s) => write!(
-                            out,
+                            buffer,
                             "{}{}{}",
                             color::Fg(color::Red),
                             truncate_dots(s, area.w as usize),
@@ -62,6 +63,7 @@ impl Window {
                 None => break,
             }
         }
+        out.write(&buffer)?;
         out.flush()?;
 
         self.lines.clear();
-- 
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