From 662b837ae3c758fefcc9cfc0d7267b241e01f99a Mon Sep 17 00:00:00 2001
From: Wilfred Hughes <me@wilfred.me.uk>
Date: Mon, 19 Sep 2022 09:47:55 -0700
Subject: [PATCH] Introduce a TreeSitterError atom kind

Starting work on #267
---
 src/display/style.rs            |  3 +++
 src/parse/syntax.rs             |  1 +
 src/parse/tree_sitter_parser.rs | 13 +++++++++----
 3 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/src/display/style.rs b/src/display/style.rs
index 484b2e31ba..f738bd83df 100644
--- a/src/display/style.rs
+++ b/src/display/style.rs
@@ -299,6 +299,9 @@ pub fn color_positions(
                             AtomKind::Keyword | AtomKind::Type => {
                                 style = style.bold();
                             }
+                            AtomKind::TreeSitterError => {
+                                style = style.purple()
+                            }
                             AtomKind::Normal => {}
                         }
                     }
diff --git a/src/parse/syntax.rs b/src/parse/syntax.rs
index d40892f296..bc5f8d7fc2 100644
--- a/src/parse/syntax.rs
+++ b/src/parse/syntax.rs
@@ -583,6 +583,7 @@ pub enum AtomKind {
     Type,
     Comment,
     Keyword,
+    TreeSitterError,
 }
 
 /// Unlike atoms, tokens can be delimiters like `{`.
diff --git a/src/parse/tree_sitter_parser.rs b/src/parse/tree_sitter_parser.rs
index b700587bd6..ecb8a5390a 100644
--- a/src/parse/tree_sitter_parser.rs
+++ b/src/parse/tree_sitter_parser.rs
@@ -1238,13 +1238,18 @@ fn atom_from_cursor<'a>(
         content = content.trim();
     }
 
-    // 'extra' nodes in tree-sitter are comments. Most parsers use
-    // 'comment' as their comment node name, but if they don't we can
-    // still detect comments by looking at their syntax highlighting.
-    let highlight = if node.is_extra()
+    node.is_error();
+
+    let highlight = if node.is_error() {
+        AtomKind::TreeSitterError
+    } else if node.is_extra()
         || node.kind() == "comment"
         || highlights.comment_ids.contains(&node.id())
     {
+        // 'extra' nodes in tree-sitter are comments. Most parsers use
+        // 'comment' as their comment node name, but if they don't we
+        // can still detect comments by looking at their syntax
+        // highlighting.
         AtomKind::Comment
     } else if highlights.keyword_ids.contains(&node.id()) {
         AtomKind::Keyword