ghc-tree-diff

Diffing of (expression) trees

Common diff algorithm works on list structures: ' diff :: Eq a =>[a] ->[a] ->[Edit a] ' This package works on trees. ' treeDiff :: Eq a =>Tree a ->Tree a ->Edit (EditTree a) ' This package also provides a way to diff arbitrary ADTs, using 'Generics'-derivable helpers. This package differs from<http://hackage.haskell.org/package/gdiff gdiff>, in a two ways: 'tree-diff' doesn't have patch function, and the "edit-script" is a tree itself, which is useful for pretty-printing. '>>>prettyEditExpr $ ediff (Foo 42 [True, False] "old") (Foo 42 [False, False, True] "new") Foo {fooBool = [-True, +False, False, +True], fooInt = 42, fooString = -"old" +"new"} '.

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