feat(cmd): add the `strip_newline` flag

This commit adds the `strip_newline` flag to the `Git.execute` method.
When this flag is set to `True`, it will trim the trailing `\n`. The
default value is `True` for backward compatibility. Setting it to
`False` is helpful for, e.g., the `git show` output, especially with the binary
file, as the missing `\n` may invalidate the file.

1 files changed, 10 insertions, 0 deletions

diff --git a/test/test_repo.py b/test/test_repo.py
index 6d617609..14339f57 100644
--- a/test/test_repo.py
+++ b/test/test_repo.py
@@ -1098,3 +1098,13 @@ class TestRepo(TestBase):
         except GitCommandError:
             pass
         self.assertEqual(r.currently_rebasing_on(), commitSpanish)
+
+    @with_rw_directory
+    def test_do_not_strip_newline(self, rw_dir):
+        r = Repo.init(rw_dir)
+        fp = osp.join(rw_dir, 'hello.txt')
+        with open(fp, 'w') as fs:
+            fs.write("hello\n")
+        r.git.add(Git.polish_url(fp))
+        r.git.commit(message="init")
+        self.assertEqual(r.git.show("HEAD:hello.txt", strip_newline=False), 'hello\n')