Add support for 7z archives

* lisp/dired-aux.el (dired-compress-file-suffixes): "Z" should now
  also work with 7z archives.

The shell command should produce a single extracted directory named
after the archive's name.

In case the extracted directory exists, all files will be overwritten
without a prompt. This matches the expected behavior with the "tar.gz"
archives.

1 files changed, 1 insertions, 0 deletions

diff --git a/lisp/dired-aux.el b/lisp/dired-aux.el
index 3e387d9e0df..990bf6aa34c 100644
--- a/lisp/dired-aux.el
+++ b/lisp/dired-aux.el
@@ -902,6 +902,7 @@ command with a prefix argument (the value does not matter)."
     ("\\.bz2\\'" "" "bunzip2")
     ("\\.xz\\'" "" "unxz")
     ("\\.zip\\'" "" "unzip -o -d %o %i")
+    ("\\.7z\\'" "" "7z x -aoa -o%o %i")
     ;; This item controls naming for compression.
     ("\\.tar\\'" ".tgz" nil)
     ;; This item controls the compression of directories