Extract private method for Git._folder_args

poetry/vcs/git.py

@@ -45,58 +45,35 @@ def clone(self, repository, dest):  # type: (...) -> str
         return self.run("clone", repository, str(dest))
 
     def checkout(self, rev, folder=None):  # type: (...) -> str
-        args = []
-        if folder is None and self._work_dir:
-            folder = self._work_dir
-
-        if folder:
-            args += [
-                "--git-dir",
-                (folder / ".git").as_posix(),
-                "--work-tree",
-                folder.as_posix(),
-            ]
-
+        args = self._folder_args(folder)
         args += ["checkout", rev]
-
         return self.run(*args)
 
     def rev_parse(self, rev, folder=None):  # type: (...) -> str
-        args = []
-        if folder is None and self._work_dir:
-            folder = self._work_dir
-
-        if folder:
-            args += [
-                "--git-dir",
-                (folder / ".git").as_posix(),
-                "--work-tree",
-                folder.as_posix(),
-            ]
-
+        args = self._folder_args(folder)
         args += ["rev-parse", rev]
-
         return self.run(*args)
 
     def get_ignored_files(self, folder=None):  # type: (...) -> list
+        args = self._folder_args(folder)
+        args += ["ls-files", "--others", "-i", "--exclude-standard"]
+        output = self.run(*args)
+        return output.split("\n")
+
+    def run(self, *args):  # type: (...) -> str
+        return decode(
+            subprocess.check_output(["git"] + list(args), stderr=subprocess.STDOUT)
+        )
+
+    def _folder_args(self, folder):  # type: (...) -> list
         args = []
         if folder is None and self._work_dir:
             folder = self._work_dir
-
         if folder:
             args += [
                 "--git-dir",
                 (folder / ".git").as_posix(),
                 "--work-tree",
                 folder.as_posix(),
             ]
-
-        args += ["ls-files", "--others", "-i", "--exclude-standard"]
-        output = self.run(*args)
-
-        return output.split("\n")
-
-    def run(self, *args):  # type: (...) -> str
-        return decode(
-            subprocess.check_output(["git"] + list(args), stderr=subprocess.STDOUT)
-        )
+        return args