fix: preserve SQL highlighting with Jinja templates

Packages/Shared/CmuxSyntaxHighlighting/Sources/CmuxSyntaxHighlighting/HighlightrThemeAdapter.swift

@@ -8,6 +8,10 @@ final class HighlightrThemeAdapter {
     /// Creates an adapter when Highlightr can initialize its JavaScript engine.
     init?() {
         guard let highlightr = Highlightr() else { return nil }
+        // File Preview handles source files that embed another language (for
+        // example dbt SQL with Jinja delimiters). Keep valid tokens around
+        // grammar-illegal characters instead of aborting the whole document.
+        highlightr.ignoreIllegals = true
         self.highlightr = highlightr
     }
 

Packages/Shared/CmuxSyntaxHighlighting/Tests/CmuxSyntaxHighlightingTests/HighlightrSyntaxEngineTests.swift

@@ -2,6 +2,10 @@
 import Foundation
 import Testing
 
+#if canImport(AppKit)
+import AppKit
+#endif
+
 @Suite("Highlightr syntax engine")
 struct HighlightrSyntaxEngineTests {
     @Test("Policy rejection returns nil without coloring")
@@ -15,4 +19,30 @@ struct HighlightrSyntaxEngineTests {
         #expect(highlighted == nil)
     }
 
+#if canImport(AppKit)
+    @Test("SQL containing Jinja delimiters still highlights SQL tokens")
+    func sqlContainingJinjaDelimitersStillHighlightsTokens() async throws {
+        let engine = HighlightrSyntaxEngine()
+        let source = """
+        select id, name
+        from {{ ref('users') }}
+        where active = true
+        """
+
+        let highlighted = try #require(
+            await engine.highlight(text: source, language: "sql", theme: .dark)
+        )
+        let selectRange = (highlighted.value.string as NSString).range(of: "select")
+        #expect(selectRange.location != NSNotFound)
+        let color = highlighted.value.attribute(
+            .foregroundColor,
+            at: selectRange.location,
+            effectiveRange: nil
+        )
+        #expect(
+            HighlightColorRemapper(theme: .dark).hexKey(from: color as Any) == "0091FF"
+        )
+    }
+#endif
+
 }