2013-05-13 04:04:03 -04:00
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require 'diffy'
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2013-02-25 11:42:20 -05:00
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# This class is used to generate diffs, it will be consumed by the UI on
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2013-02-23 00:30:02 -05:00
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# on the client the displays diffs.
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#
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2013-03-15 20:31:51 -04:00
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# There are potential performance issues associated with diffing large amounts of completely
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# different text, see answer here for optimization if needed
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# http://meta.stackoverflow.com/questions/127497/suggested-edit-diff-shows-different-results-depending-upon-mode
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2013-02-23 00:30:02 -05:00
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class DiffEngine
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2013-02-25 11:42:20 -05:00
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2013-03-15 20:31:51 -04:00
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# generate an html friendly diff similar to the way Stack Exchange generates
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# html diffs
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2013-02-23 00:30:02 -05:00
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#
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2013-03-06 02:52:24 -05:00
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# returns: html containing decorations indicating the changes
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2013-02-23 00:30:02 -05:00
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def self.html_diff(html_before, html_after)
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2013-07-23 14:42:52 -04:00
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Diffy::Diff.new(html_before, html_after, {allow_empty_diff: false}).to_s(:html)
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2013-02-23 00:30:02 -05:00
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end
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# same as html diff, except that it operates on markdown
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#
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# returns html containing decorated areas where diff happened
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def self.markdown_diff(markdown_before, markdown_after)
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2013-03-15 20:31:51 -04:00
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Diffy::Diff.new(markdown_before, markdown_after).to_s(:html)
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2013-02-23 00:30:02 -05:00
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end
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end
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