fix: Handle missing git module gracefully

aider/coders/search_replace.py

@@ -3,7 +3,11 @@
 import sys
 from pathlib import Path
 
-import git
+try:
+    import git
+except ImportError:
+    git = None
+
 from diff_match_patch import diff_match_patch
 from tqdm import tqdm
 

aider/main.py

@@ -9,7 +9,11 @@ import webbrowser
 from dataclasses import fields
 from pathlib import Path
 
-import git
+try:
+    import git
+except ImportError:
+    git = None
+
 import importlib_resources
 from dotenv import load_dotenv
 from prompt_toolkit.enums import EditingMode
@@ -93,6 +97,9 @@ def make_new_repo(git_root, io):
 
 
 def setup_git(git_root, io):
+    if git is None:
+        return
+
     try:
         cwd = Path.cwd()
     except OSError:
@@ -410,7 +417,9 @@ def main(argv=None, input=None, output=None, force_git_root=None, return_coder=F
     if argv is None:
         argv = sys.argv[1:]
 
-    if force_git_root:
+    if git is None:
+        git_root = None
+    elif force_git_root:
         git_root = force_git_root
     else:
         git_root = get_git_root()
@@ -451,6 +460,9 @@ def main(argv=None, input=None, output=None, force_git_root=None, return_coder=F
 
     args, unknown = parser.parse_known_args(argv)
 
+    if git is None:
+        args.git = False
+
     # Load the .env file specified in the arguments
     loaded_dotenvs = load_dotenv_files(git_root, args.env_file, args.encoding)
 
@@ -646,7 +658,7 @@ def main(argv=None, input=None, output=None, force_git_root=None, return_coder=F
     # We can't know the git repo for sure until after parsing the args.
     # If we guessed wrong, reparse because that changes things like
     # the location of the config.yml and history files.
-    if args.git and not force_git_root:
+    if args.git and not force_git_root and git is not None:
         right_repo_root = guessed_wrong_repo(io, git_root, fnames, git_dname)
         if right_repo_root:
             analytics.event("exit", reason="Recursing with correct repo")

aider/repo.py

@@ -2,7 +2,17 @@ import os
 import time
 from pathlib import Path, PurePosixPath
 
-import git
+try:
+    import git
+
+    ANY_GIT_ERROR = [
+        git.exc.ODBError,
+        git.exc.GitError,
+    ]
+except ImportError:
+    git = None
+    ANY_GIT_ERROR = []
+
 import pathspec
 
 from aider import prompts, utils
@@ -10,15 +20,14 @@ from aider.sendchat import simple_send_with_retries
 
 from .dump import dump  # noqa: F401
 
-ANY_GIT_ERROR = (
+ANY_GIT_ERROR += [
-    git.exc.ODBError,
-    git.exc.GitError,
     OSError,
     IndexError,
     BufferError,
     TypeError,
     ValueError,
-)
+]
+ANY_GIT_ERROR = tuple(ANY_GIT_ERROR)
 
 
 class GitRepo:

aider/utils.py

@@ -8,8 +8,6 @@ import tempfile
 import time
 from pathlib import Path
 
-import git
-
 from aider.dump import dump  # noqa: F401
 
 IMAGE_EXTENSIONS = {".png", ".jpg", ".jpeg", ".gif", ".bmp", ".tiff", ".webp", ".pdf"}
@@ -73,6 +71,8 @@ class GitTemporaryDirectory(ChdirTemporaryDirectory):
 
 
 def make_repo(path=None):
+    import git
+
     if not path:
         path = "."
     repo = git.Repo.init(path)