ediff-merge-directories-with-ancestor

ediff-merge-directories-with-ancestor is an interactive autoloaded compiled Lisp function in `ediff.el'.

It is bound to <menu-bar> <tools> <ediff-merge> <ediff-merge-directories-with-ancestor>.

(ediff-merge-directories-with-ancestor DIR1 DIR2 ANCESTOR-DIR REGEXP &optional MERGE-AUTOSTORE-DIR)

Merge files in directories DIR1 and DIR2 using files in ANCESTOR-DIR as ancestors.
Ediff merges files that have identical names in DIR1, DIR2. If a pair of files
in DIR1 and DIR2 doesn't have an ancestor in ANCESTOR-DIR, Ediff will merge
without ancestor. The fourth argument, REGEXP, is nil or a regular expression;
only file names that match the regexp are considered.