feat: diff-lcs 2.0.0 beta 1 #214
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Breaking-Change: The htmldiff binary and support code have been removed without replacement. Signed-off-by: Austin Ziegler <[email protected]>
With Ruby 3.2 as the minimum supported version, compatibility shims for older Ruby versions are no longer needed. Breaking-Change: Removed backports.rb which provided compatibility for older Ruby versions. Signed-off-by: Austin Ziegler <[email protected]>
These formats are super old and very unlikely used. Their implementation was broken for a while and no-one reported it. The GNU doc say that ed format is "almost obsolete". [1] The reverse_ed (aka forward-ed) is described as "not very useful". [2] [1]: https://www.gnu.org/software/diffutils/manual/html_node/ed-Scripts.html [2]: https://www.gnu.org/software/diffutils/manual/html_node/Forward-ed.html Resolves: #108 Breaking-Change: The ed and reverse_ed output formats are no longer supported in ldiff. Signed-off-by: Austin Ziegler <[email protected]>
Signed-off-by: Austin Ziegler <[email protected]>
Modernized Block class using Ruby 3.2+ Data class for immutability and better performance. The constructor is private; use from_chunk instead. Breaking-Change: Block is immutable; new is private, from_chunk instead Signed-off-by: Austin Ziegler <[email protected]>
Modernized `Diff::LCS::Change` and `Diff::LCS::ContextChange` using immutable Data classes. Breaking-Change: change objects are immutable Signed-off-by: Austin Ziegler <[email protected]>
Signed-off-by: Austin Ziegler <[email protected]>
Optimized hunk processing by caching encoding-related strings and removing unnecessary encoding detection conditionals. Signed-off-by: Austin Ziegler <[email protected]>
Applied modern Ruby design and simplified implementation around string enumerable sequences. Signed-off-by: Austin Ziegler <[email protected]>
Simplified string enumerable sequence handling. Signed-off-by: Austin Ziegler <[email protected]>
Simplified build tooling, updated GitHub Actions workflows, prepared changelog for dev release, and updated support for Ruby 3.2 through 4.x. - Streamlined Rakefile and Gemfile and removed unnecessary complexity - Added Ruby 4.0 support and dropped unsupported Ruby versions - Simplified CI configuration - Updated release and support documents. Signed-off-by: Austin Ziegler <[email protected]>
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This was referenced Dec 31, 2025
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This prepares for the release of diff-lcs 2.0 beta 1. This version makes Ruby 3.2 the minimum supported version, allowing for significant modernization and breaking changes.
With modern Ruby support, we get:
readability improvements (endless methods, pattern matching);
support for immutable Data classes (
Diff::LCS::Block,Diff::LCS::Change, andDiff::LCS::ContextChange);removal of compatibility shims;
reduction in conditional tests in loops, especially for String character extraction (compare
string ? seq[i, 1] : seq[i]toseq[i]); andoptimizations to string and relying on standard encoding support present since Ruby 2.1.
The primary API (methods and class methods on
Diff::LCS) has not changed, with one exception noted below. Internal APIs (includingDiff::LCS::Block,Diff::LCS::Change,Diff::LCS::ContextChange, andDiff::LCS::Hunk) have changed for compatibility.Additionally:
The
htmldiffbinary and supporting code have been removed without replacement.ldiffno longer supportsed-script output (edandreverse_edformats). As Baptiste Courtois says in Drop ed & reverse_ed formats #108, the "implementation was broken for a while and no-one reported it."The method
Diff::LCS.LCShas been removed as an alias forDiff::LCS.lcs. Most callers are usingDiff::LCS.lcsand modern Ruby did-you-mean support should assist with this update.Release Timeline
This is a development release (2.0.0.beta.1) to allow downstream consumers (especially RSpec) time to test compatibility before the final 2.0 release in January 2026.