ast-merge v4.0.1 released!

4.0.1 - 2026-01-11

• TAG: v4.0.1
• COVERAGE: 96.45% – 2553/2647 lines in 51 files
• BRANCH COVERAGE: 87.41% – 812/929 branches in 51 files
• 98.80% documented

Added

• Ast::Merge::RSpec::MergeGemRegistry - Fully dynamic merge gem registration for RSpec dependency tags
  • register(tag_name, require_path:, merger_class:, test_source:, category:) - Register a merge gem
  • available?(tag_name) - Check if a merge gem is available and functional
  • registered_gems - Get all registered gem tag names
  • gems_by_category(category) - Filter gems by category (:markdown, :data, :code, :config, :other)
  • summary - Get availability status of all registered gems
  • Automatically defines *_available? methods on DependencyTags at registration time
  • External merge gems can now get full RSpec tag support without modifying ast-merge

Changed

• Upgrade to tree_haver v5.0.1
• Ast::Merge::AstNode now inherits from TreeHaver::Base::Node
  • Ensures synthetic nodes stay in sync with the canonical Node API
  • Inherits Comparable, Enumerable from base class
  • Retains all existing methods and behavior (Point, Location, signature, etc.)
  • Constructor calls super(self, source: source) to properly initialize base class
• RSpec Dependency Tags refactored to use MergeGemRegistry
  • Removed hardcoded merge gem availability checks
  • Removed MERGE_GEM_TEST_SOURCES constant
  • *_available? methods are now defined dynamically when gems register
  • any_markdown_merge_available? now queries registry by category
  • RSpec exclusion filters are configured dynamically from registry
• Ast::Merge::Testing::TestableNode now delegates to TreeHaver::RSpec::TestableNode
  • The TestableNode implementation has been moved to tree_haver for sharing across all merge gems
  • spec/support/testable_node.rb now requires and re-exports the tree_haver version
  • Backward compatible: existing tests continue to work unchanged
• spec/ast/merge/node_wrapper_base_spec.rb refactored to use TestableNode instead of mocks
  • Real TreeHaver::Node behavior for most tests
  • Mocks only retained for edge case testing (e.g., invalid end_line before start_line)

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