Add completeBrackets flag to Behavior configuration

Add a completeBrackets property to SourceEditorConfiguration.Behavior
that controls whether bracket pair completion filters are registered.
When false, open-pair and delete-pair filters are skipped in
setUpTextFormation(), allowing consumers to disable automatic bracket
completion via configuration.

Fixes CodeEditApp/CodeEdit#1691

Author: cavoco

Sources/CodeEditSourceEditor/Controller/TextViewController+TextFormation.swift

@@ -18,11 +18,14 @@ extension TextViewController {
         textFilters = []
 
         // Filters
-
-        setUpOpenPairFilters(pairs: BracketPairs.allValues)
+        if configuration.behavior.completeBrackets {
+            setUpOpenPairFilters(pairs: BracketPairs.allValues)
+        }
         setUpTagFilter()
         setUpNewlineTabFilters(indentOption: configuration.behavior.indentOption)
-        setUpDeletePairFilters(pairs: BracketPairs.allValues)
+        if configuration.behavior.completeBrackets {
+            setUpDeletePairFilters(pairs: BracketPairs.allValues)
+        }
         setUpDeleteWhitespaceFilter(indentOption: configuration.behavior.indentOption)
     }
 

Sources/CodeEditSourceEditor/SourceEditorConfiguration/SourceEditorConfiguration+Behavior.swift

@@ -19,17 +19,23 @@ extension SourceEditorConfiguration {
 
         /// The column to reformat at.
         public var reformatAtColumn: Int = 80
+        
+        /// Controls whether bracket pairs are automatically completed when typing an opening bracket.
+        /// When `true`, typing `{` will automatically insert `}`. Defaults to `true`.
+        public var completeBrackets: Bool = true
 
         public init(
             isEditable: Bool = true,
             isSelectable: Bool = true,
             indentOption: IndentOption = .spaces(count: 4),
-            reformatAtColumn: Int = 80
+            reformatAtColumn: Int = 80,
+            completeBrackets: Bool = true
         ) {
             self.isEditable = isEditable
             self.isSelectable = isSelectable
             self.indentOption = indentOption
             self.reformatAtColumn = reformatAtColumn
+            self.completeBrackets = completeBrackets
         }
 
         @MainActor
@@ -57,6 +63,10 @@ extension SourceEditorConfiguration {
                 controller.reformattingGuideView.updatePosition(in: controller)
                 controller.view.updateConstraintsForSubtreeIfNeeded()
             }
+          
+            if oldConfig?.completeBrackets != completeBrackets {
+                controller.setUpTextFormation()
+            }
         }
     }
 }

Tests/CodeEditSourceEditorTests/Controller/TextViewControllerTests.swift

@@ -3,6 +3,7 @@ import XCTest
 import SwiftTreeSitter
 import AppKit
 import SwiftUI
+import TextFormation
 import TextStory
 
 // swiftlint:disable:next type_body_length
@@ -216,6 +217,26 @@ final class TextViewControllerTests: XCTestCase {
         XCTAssertEqual(controller.textView.string, String(repeating: " ", count: 1000))
     }
 
+    // MARK: Bracket Completion
+
+    func test_completeBracketsEnabled() {
+        controller.configuration.behavior.completeBrackets = true
+
+        let hasPairFilter = controller.textFilters.contains(where: { $0 is StandardOpenPairFilter })
+        let hasDeleteFilter = controller.textFilters.contains(where: { $0 is DeleteCloseFilter })
+        XCTAssertTrue(hasPairFilter, "Should have open pair filters when completeBrackets is enabled")
+        XCTAssertTrue(hasDeleteFilter, "Should have delete pair filters when completeBrackets is enabled")
+    }
+
+    func test_completeBracketsDisabled() {
+        controller.configuration.behavior.completeBrackets = false
+
+        let hasPairFilter = controller.textFilters.contains(where: { $0 is StandardOpenPairFilter })
+        let hasDeleteFilter = controller.textFilters.contains(where: { $0 is DeleteCloseFilter })
+        XCTAssertFalse(hasPairFilter, "Should not have open pair filters when completeBrackets is disabled")
+        XCTAssertFalse(hasDeleteFilter, "Should not have delete pair filters when completeBrackets is disabled")
+    }
+
     func test_letterSpacing() throws {
         let font: NSFont = .monospacedSystemFont(ofSize: 11, weight: .medium)