From 552914bb314f539f8a2ff831003509267d5f6e40 Mon Sep 17 00:00:00 2001
From: Greg Bolsinga <bolsinga@mac.com>
Date: Sat, 15 Jun 2024 10:40:02 -0700
Subject: [PATCH] fix when emphasizing the empty string (#811)

---
 Sources/Site/Utility/String+EmphasizedMatching.swift | 2 ++
 Tests/SiteTests/EmphasizedMatchingTests.swift        | 8 ++++++++
 2 files changed, 10 insertions(+)

diff --git a/Sources/Site/Utility/String+EmphasizedMatching.swift b/Sources/Site/Utility/String+EmphasizedMatching.swift
index e5301b0..38b883d 100644
--- a/Sources/Site/Utility/String+EmphasizedMatching.swift
+++ b/Sources/Site/Utility/String+EmphasizedMatching.swift
@@ -10,6 +10,8 @@ import RegexBuilder
 
 extension String {
   func emphasized(matching fragment: String) -> String {
+    guard !fragment.isEmpty else { return self }
+
     let regex = Regex {
       Capture {
         fragment
diff --git a/Tests/SiteTests/EmphasizedMatchingTests.swift b/Tests/SiteTests/EmphasizedMatchingTests.swift
index c105f0e..2a0fd87 100644
--- a/Tests/SiteTests/EmphasizedMatchingTests.swift
+++ b/Tests/SiteTests/EmphasizedMatchingTests.swift
@@ -29,4 +29,12 @@ final class EmphasizedMatchingTests: XCTestCase {
     XCTAssertEqual("Gregr".emphasized(matching: "Gr"), "**Gr**egr")
     XCTAssertEqual("GregR".emphasized(matching: "gr"), "**Gr**egR")
   }
+
+  func testNoMatches() throws {
+    XCTAssertEqual("Greg".emphasized(matching: "o"), "Greg")
+  }
+
+  func testEmptyStringMatches() throws {
+    XCTAssertEqual("Greg".emphasized(matching: ""), "Greg")
+  }
 }