Disable bot commit (#201)

# Motivation
<!-- Why is this change necessary? -->

# Content
<!-- Please include a summary of the change -->
# Testing
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# Please check the following before marking your PR as ready for review

- [ ] I have added tests for my changes
- [ ] I have updated the documentation or added new documentation as
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- [ ] I have read and agree to the [Contributor License
Agreement](../CLA.md)

Author: bagel897

src/codegen/git/repo_operator/local_repo_operator.py

@@ -34,7 +34,7 @@ def __init__(
         self,
         repo_path: str,  # full path to the repo
         repo_config: BaseRepoConfig | None = None,
-        bot_commit: bool = True,
+        bot_commit: bool = False,
     ) -> None:
         self._repo_path = repo_path
         self._repo_name = os.path.basename(repo_path)

src/codegen/git/repo_operator/repo_operator.py

@@ -63,25 +63,65 @@ def viz_path(self) -> str:
     def viz_file_path(self) -> str:
         return os.path.join(self.viz_path, "graph.json")
 
+    def _set_bot_email(self, git_cli: GitCLI) -> None:
+        with git_cli.config_writer("repository") as writer:
+            if not writer.has_section("user"):
+                writer.add_section("user")
+            writer.set("user", "email", CODEGEN_BOT_EMAIL)
+
+    def _set_bot_username(self, git_cli: GitCLI) -> None:
+        with git_cli.config_writer("repository") as writer:
+            if not writer.has_section("user"):
+                writer.add_section("user")
+            writer.set("user", "name", CODEGEN_BOT_NAME)
+
+    def _unset_bot_email(self, git_cli: GitCLI) -> None:
+        with git_cli.config_writer("repository") as writer:
+            if writer.has_option("user", "email"):
+                writer.remove_option("user", "email")
+
+    def _unset_bot_username(self, git_cli: GitCLI) -> None:
+        with git_cli.config_writer("repository") as writer:
+            if writer.has_option("user", "name"):
+                writer.remove_option("user", "name")
+
     @cached_property
     def git_cli(self) -> GitCLI:
         """Note: this is recursive, may want to look out"""
         git_cli = GitCLI(self.repo_path)
-        has_username = False
-        has_email = False
-        with git_cli.config_reader(None) as reader:
-            if reader.has_option("user", "name"):
-                has_username = True
-            if reader.has_option("user", "email"):
-                has_email = True
-        with git_cli.config_writer("repository") as writer:
-            if not has_username or not has_email or self.bot_commit:
-                if not writer.has_section("user"):
-                    writer.add_section("user")
-                if not has_username or self.bot_commit:
-                    writer.set("user", "name", CODEGEN_BOT_NAME)
-                if not has_email or self.bot_commit:
-                    writer.set("user", "email", CODEGEN_BOT_EMAIL)
+        username = None
+        user_level = None
+        email = None
+        email_level = None
+        levels = ["system", "global", "user", "repository"]
+        for level in levels:
+            with git_cli.config_reader(level) as reader:
+                if reader.has_option("user", "name") and not username:
+                    username = reader.get("user", "name")
+                    user_level = level
+                if reader.has_option("user", "email") and not email:
+                    email = reader.get("user", "email")
+                    email_level = level
+        if self.bot_commit:
+            self._set_bot_email(git_cli)
+            self._set_bot_username(git_cli)
+        else:
+            # we need a username and email to commit, so if they're not set, set them to the bot's
+            # Case 1: username is not set: set it to the bot's
+            if not username:
+                self._set_bot_username(git_cli)
+            # Case 2: username is set to the bot's at the repo level, but something else is set at the user level: unset it
+            elif username != CODEGEN_BOT_NAME and user_level != "repository":
+                self._unset_bot_username(git_cli)
+            # Case 3: username is only set at the repo level: do nothing
+            else:
+                pass  # no-op to make the logic clearer
+            # Repeat for email
+            if not email:
+                self._set_bot_email(git_cli)
+
+            elif email != CODEGEN_BOT_EMAIL and email_level != "repository":
+                self._unset_bot_email(git_cli)
         return git_cli
 
     @property