Bump diff-lcs from 1.6.2 to 2.0.0

[dependabot]

Bumps diff-lcs from 1.6.2 to 2.0.0.

Changelog

Sourced from diff-lcs's changelog.

2.0.0 / 2026-02-01

This release has significant breaking changes.

• diff-lcs 2 supports Ruby 3.2 or higher. This allowed:

  • readability improvements (endless methods, pattern matching);

  • support for immutable Data classes (Diff::LCS::Block, Diff::LCS::Change, and Diff::LCS::ContextChange);

  • removal of compatibility shims;

  • reduction in conditional tests in loops, especially for String character extraction (compare string ? seq[i, 1] : seq[i] to seq[i]); and

  • optimizations 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 (including Diff::LCS::Block, Diff::LCS::Change, Diff::LCS::ContextChange, and Diff::LCS::Hunk) have changed for compatibility.

• The htmldiff binary and supporting code have been removed without replacement.

• ldiff no longer supports ed-script output (ed and reverse_ed formats). As Baptiste Courtois says in #108[pull-108], the "implementation was broken for a while and no-one reported it."

• The method Diff::LCS.LCS has been removed as an alias for Diff::LCS.lcs. Most callers are using Diff::LCS.lcs and modern Ruby did-you-mean support should assist with this update.

• Diff::LCS::Change objects implemented the comparison operator (<=>) incorrectly. Comparisons are now done so that the position is compared first, then the action (by index of VALID_ACTIONS), and finally the element. Diff::LCS::ContextChange works similarly, comparing the old and new positions prior to comparing the actions by index.

  The order of VALID_ACTIONS was changed for the index order to make sense.

• ldiff now implements - as a filename option for standard input. This is used for integration testing with RSpec like this:

  rspec -Ilib -rdiff/lcs integration/failure/array_diff_spec.rb 2>&1 |
    ruby -Ilib bin/ldiff -U integration/golden/array_diff.txt -

... (truncated)

Commits

• 2a54e8d chore: Update actions
• b025097 feat: Release diff-lcs 2.0
• 1fd0df4 deps: Bump the actions group with 2 updates
• d57b406 chore: Add RSpec integration tests
• 98d6c0f chore: Switch to Minitest for primary tests
• c6abce6 docs: Add badges to readme
• 85d0664 chore: Simplify security policy
• 842824f docs: Update HTTP to HTTPS where possible
• 62c7dfe chore: Prepare for release of diff-lcs 2.0 beta 1
• c57b5af feat: Modernize LCS Internals
• Additional commits viewable in compare view

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