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Use Diffy as DiffEngine implementation

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Sandy Vanderbleek
2013-03-15 17:31:51 -07:00
parent 19860bd2c5
commit 204dcc43a4
5 changed files with 74 additions and 9 deletions
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11
lib/diff_engine.rb
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@ -1,21 +1,24 @@
# This class is used to generate diffs, it will be consumed by the UI on
# on the client the displays diffs.
#
# Ruby has the diff/lcs engine that can do some of the work, the devil
# is in the details
# There are potential performance issues associated with diffing large amounts of completely
# different text, see answer here for optimization if needed
# http://meta.stackoverflow.com/questions/127497/suggested-edit-diff-shows-different-results-depending-upon-mode
class DiffEngine
# generate an html friendly diff similar to the way Stack Exchange generate
# html diffs
# generate an html friendly diff similar to the way Stack Exchange generates
# html diffs
#
# returns: html containing decorations indicating the changes
def self.html_diff(html_before, html_after)
Diffy::Diff.new(html_before, html_after).to_s(:html)
end
# same as html diff, except that it operates on markdown
#
# returns html containing decorated areas where diff happened
def self.markdown_diff(markdown_before, markdown_after)
Diffy::Diff.new(markdown_before, markdown_after).to_s(:html)
end
end