7z supports xz.

patoolib/__init__.py

@@ -244,7 +244,7 @@ ArchivePrograms = {
         'create': ('shorten',),
     },
     'xz': {
-        None: ('xz',),
+        None: ('xz', '7z'),
         'extract': py_lzma,
         'create': py_lzma,
     },

patoolib/programs/p7zip.py

@@ -30,6 +30,7 @@ extract_bzip2 = \
   extract_rpm = \
   extract_deb = \
   extract_iso = \
+  extract_xz = \
   extract_7z
 
 def list_7z (archive, compression, cmd, verbosity):
@@ -47,6 +48,7 @@ list_bzip2 = \
   list_rpm = \
   list_deb = \
   list_iso = \
+  list_xz = \
   list_7z
 
 
@@ -65,6 +67,7 @@ test_bzip2 = \
   test_rpm = \
   test_deb = \
   test_iso = \
+  test_xz = \
   test_7z
 
 
@@ -75,4 +78,5 @@ def create_7z (archive, compression, cmd, verbosity, filenames):
     return cmdlist
 
 create_zip = \
+  create_xz = \
   create_7z

tests/archives/test_7z.py

@@ -24,6 +24,7 @@ class Test7z (ArchiveTest):
     def test_7z (self):
         self.archive_commands('t .7z')
         self.archive_commands('t.zip')
+        self.archive_commands('t.txt.xz', check=Content.Singlefile)
         self.archive_list('t.txt.gz')
         self.archive_list('t.txt.bz2')
         self.archive_list('t.jar')
@@ -67,6 +68,7 @@ class Test7z (ArchiveTest):
     def test_7z_file (self):
         self.archive_commands('t.7z.foo', skip_create=True)
         self.archive_commands('t.zip.foo', skip_create=True)
+        self.archive_commands('t.txt.xz.foo', skip_create=True, check=Content.Singlefile)
         self.archive_list('t.txt.gz.foo')
         self.archive_list('t.txt.bz2.foo')
         self.archive_list('t.jar.foo')
@@ -105,4 +107,3 @@ class Test7z (ArchiveTest):
         self.archive_list('t.rar.foo')
         self.archive_extract('t.rar.foo')
         self.archive_test('t.rar.foo')
-