115 lines
2.2 KiB
Ruby
115 lines
2.2 KiB
Ruby
# frozen_string_literal: true
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module Mutant
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# Class to create diffs from source code
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class Diff
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include Adamantium::Flat, Concord.new(:old, :new)
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ADDITION = '+'
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DELETION = '-'
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NEWLINE = "\n"
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# Unified source diff between old and new
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#
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# @return [String]
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# if there is exactly one diff
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#
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# @return [nil]
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# otherwise
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def diff
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return if diffs.empty?
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minimized_hunk.diff(:unified) + NEWLINE
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end
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memoize :diff
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# Colorized unified source diff between old and new
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#
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# @return [String]
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# if there is a diff
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#
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# @return [nil]
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# otherwise
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def colorized_diff
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return unless diff
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diff.lines.map(&self.class.method(:colorize_line)).join
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end
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memoize :colorized_diff
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# Build new object from source strings
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#
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# @param [String] old
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# @param [String] new
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#
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# @return [Diff]
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def self.build(old, new)
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new(lines(old), lines(new))
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end
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# Break up source into lines
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#
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# @param [String] source
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#
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# @return [Array<String>]
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def self.lines(source)
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source.lines.map(&:chomp)
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end
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private_class_method :lines
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private
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# Diffs between old and new
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#
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# @return [Array<Array>]
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def diffs
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::Diff::LCS.diff(old, new)
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end
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# Raw diff-lcs hunks
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#
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# @return [Array<Diff::LCS::Hunk>]
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def hunks
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diffs.map do |diff|
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::Diff::LCS::Hunk.new(old.map(&:dup), new, diff, max_length, 0)
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end
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end
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# Minimized hunk
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#
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# @return Diff::LCS::Hunk
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def minimized_hunk
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head, *tail = hunks
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tail.reduce(head) do |left, right|
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right.merge(left)
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right
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end
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end
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# Max length of source line in new and old
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#
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# @return [Integer]
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def max_length
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[old, new].map(&:length).max
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end
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# Colorized a unified diff line
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#
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# @param [String] line
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#
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# @return [String]
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def self.colorize_line(line)
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case line[0]
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when ADDITION
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Color::GREEN
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when DELETION
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Color::RED
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else
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Color::NONE
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end.format(line)
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end
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private_class_method :colorize_line
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end # Diff
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end # Mutant
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