Add: Extend git.log to allow setting a pretty format

Allow formatting git log output.

pontos/git/git.py

@@ -524,16 +524,26 @@ def checkout(
 
         self.exec(*args)
 
-    def log(self, *log_args: str, oneline: Optional[bool] = None) -> List[str]:
+    def log(
+        self,
+        *log_args: str,
+        oneline: Optional[bool] = None,
+        format: Optional[str] = None,
+    ) -> List[str]:
         """
         Get log of a git repository
 
         Args:
+            format: Pretty format the output.
             log_args: Additional arguments for git log
             oneline: Print the abbreviated commit id and commit message in one
                 line per commit
         """
         args = ["log"]
+
+        if format:
+            args.append(f"--format={format}")
+
         if oneline:
             args.append("--oneline")
 

tests/git/test_git.py

@@ -556,6 +556,25 @@ def test_log_with_oneline(self, exec_git_mock):
         self.assertEqual(logs[0], "50f9963 Add CircleCI config for pontos")
         self.assertEqual(logs[5], "464f24d Initial commit")
 
+    @patch("pontos.git.git.exec_git")
+    def test_log_with_format(self, exec_git_mock):
+        exec_git_mock.return_value = """Add CircleCI config for pontos
+Rename to pontos only
+Update README for installation and development
+Update README
+Add a draft for a README.md document
+Initial commit"""
+
+        git = Git()
+        logs = git.log(format="format:%s")
+
+        exec_git_mock.assert_called_once_with(
+            "log", "--format=format:%s", cwd=None
+        )
+
+        self.assertEqual(logs[0], "Add CircleCI config for pontos")
+        self.assertEqual(logs[5], "Initial commit")
+
     @patch("pontos.git.git.exec_git")
     def test_rev_list(self, exec_git_mock):
         git = Git()