Automatic Review

The code changes made in the diff show significant updates, however, there are areas that could pose issues. Here are some of the concerns identified:

The addition of the github.com/sabhiram/go-gitignore dependency is a good idea for simplifying ignore pattern handling, but it may lead to a problem with completeness if the previously existing ignore functionality is not fully tested in the new implementation. Given that the old shouldIgnore function has been removed, it's crucial to ensure that all relevant tests are updated or rewritten to cover the new logic.

• Testing: You removed the TestShouldIgnore function without replacing it with new tests that cover the behavior of the new ignoring logic using gitignore.CompileIgnoreLines.
  Suggestion: Create a new set of tests that validate the ignore functionality using the new library. This ensures that the changes you've made still behave as expected and do not introduce regressions.

  Example test case structure:

  func TestIgnorePatterns(t *testing.T) {
      ignores := gitignore.CompileIgnoreLines(".git/", "*.log", "node_modules/")
      tests := []struct {
          path     string
          expected bool
      }{
          {"test.txt", false},
          {".git/info/exclude", true},
          {"src/app.js", false},
          {"src/log.txt", true},
      }
      
      for _, test := range tests {
          t.Run(test.path, func(t *testing.T) {
              result := ignores.MatchesPath(test.path)
              if result != test.expected {
                  t.Errorf("MatchesPath(%q) = %v; want %v", test.path, result, test.expected)
              }
          })
      }
  }

Overall, while the code appears to improve readability and encapsulates responsibilities better with the new library, it is crucial to provide comprehensive testing to validate that the new implementation meets all requirements previously handled by the old shouldIgnore function.