From b120515613ba24aff224d093b28d85049c774cad Mon Sep 17 00:00:00 2001
From: Blaž Hrastnik
Date: Sat, 19 Sep 2020 11:55:42 +0900
Subject: Range based highlight_iter. Only works on limiting the start right
 now

---
 helix-term/src/editor.rs | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

(limited to 'helix-term')

diff --git a/helix-term/src/editor.rs b/helix-term/src/editor.rs
index ed2d3a13..e1288e07 100644
--- a/helix-term/src/editor.rs
+++ b/helix-term/src/editor.rs
@@ -104,13 +104,24 @@ impl Editor {
                     state.doc().len_lines() - 1,
                 );
 
+                let range = {
+                    // calculate viewport byte ranges
+                    let start = state.doc().line_to_byte(self.first_line.into());
+                    let end = state.doc().line_to_byte(last_line)
+                        + state.doc().line(last_line).len_bytes();
+
+                    start..end
+                };
+
+                // TODO: range doesn't actually restrict source, just highlight range
+
                 // TODO: cache highlight results
                 // TODO: only recalculate when state.doc is actually modified
                 let highlights: Vec<_> = state
                     .syntax
                     .as_mut()
                     .unwrap()
-                    .highlight_iter(source_code.as_bytes(), None, |_| None)
+                    .highlight_iter(source_code.as_bytes(), Some(range), None, |_| None)
                     .unwrap()
                     .collect(); // TODO: we collect here to avoid double borrow, fix later
 
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