Unified Interface for Differencers #146

VariationTree<DiffLinesLabel> s1 = VariationTree.fromFile(pathBefore);
VariationTree<DiffLinesLabel> s2 = VariationTree.fromFile(pathAfter);

VariationDiff<DiffLinesLabel> diffViaGit, diffViaGumTree, diffViaTrueDiff;
diffViaGit = VariationDiff.fromFiles(pathBefore, pathAfter,
    DiffAlgorithm.SupportedAlgorithm.MYERS,
    VariationDiffParseOptions.Default);
diffViaGumTree  = VariationDiff.fromTrees(s1, s2);
diffViaTrueDiff = TrueDiffDetective.compare(s1, s2);

public interface TextBasedDifferencer<L extends Label> {
    public VariationDiff<L> diff(String before, String after);
}

public interface TreeBasedDifferencer<L extends Label> {
    public VariationDiff<L> diff(VariationTree<L> before, VariationTree<L> after);
}