+
+USAGE='[-p] [--max-count=<n>] [<since>..<limit>] [--pretty=<format>] [-m] [git-diff-tree options] [git-rev-list options]'
+SUBDIRECTORY_OK='Yes'
+. git-sh-setup
+
+diff_tree_flags=$(git-rev-parse --sq --no-revs --flags "$@")
+test -z "$diff_tree_flags" &&
+ diff_tree_flags=$(git-repo-config --get whatchanged.difftree)
+test -z "$diff_tree_flags" &&
+ diff_tree_flags='-M --abbrev'
+