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import re
from pathlib import Path
def ensure_dir(path: Path):
path.mkdir(parents=True, exist_ok=True)
def _add_to_installed_apps(content: str, app_name: str) -> str:
"""
Safely add an app to INSTALLED_APPS if not already present.
"""
pattern = re.compile(r"INSTALLED_APPS\s*=\s*\[(.*?)\]", re.DOTALL)
match = pattern.search(content)
if not match:
return content
apps_block = match.group(1)
if f"'{app_name}'" in apps_block or f'"{app_name}"' in apps_block:
return content
updated_apps = apps_block.rstrip() + f"\n '{app_name}',"
return content[:match.start(1)] + updated_apps + content[match.end(1):]
def update_settings_py(settings_path, db_spec, app_names=None):
settings_path = Path(settings_path)
content = settings_path.read_text(encoding="utf-8")
# --------------------------------------------------
# 1. Ensure BASE_DIR
# --------------------------------------------------
if "BASE_DIR" not in content:
content = (
"from pathlib import Path\n\n"
"BASE_DIR = Path(__file__).resolve().parent.parent\n\n"
+ content
)
# --------------------------------------------------
# 2. Ensure rest_framework + project apps
# --------------------------------------------------
content = _add_to_installed_apps(content, "rest_framework")
if app_names:
for app in app_names:
content = _add_to_installed_apps(content, app)
# --------------------------------------------------
# 3. Database config (ONLY if NOT sqlite)
# --------------------------------------------------
engine = (db_spec or {}).get("engine", "").lower()
if engine and engine != "sqlite":
engine_map = {
"postgresql": "django.db.backends.postgresql",
"postgres": "django.db.backends.postgresql",
"mysql": "django.db.backends.mysql",
"mariadb": "django.db.backends.mysql",
}
django_engine = engine_map.get(engine)
if not django_engine:
raise ValueError(f"Unsupported DB engine: {engine}")
database_block = f"""
DATABASES = {{
'default': {{
'ENGINE': '{django_engine}',
'NAME': '{db_spec.get("name")}',
'USER': '{db_spec.get("user", "")}',
'PASSWORD': '{db_spec.get("password", "")}',
'HOST': '{db_spec.get("host", "")}',
'PORT': '{db_spec.get("port", "")}',
}}
}}
""".strip()
content = re.sub(
r"DATABASES\s*=\s*\{.*?\}\s*\}\s*",
database_block + "\n\n",
content,
flags=re.DOTALL
)
# --------------------------------------------------
# 4. Static & Media (idempotent)
# --------------------------------------------------
if "STATIC_ROOT" not in content:
content += """
# Static files
STATIC_URL = "/static/"
STATIC_ROOT = BASE_DIR / "staticfiles"
STATICFILES_DIRS = [BASE_DIR / "static"]
# Media files
MEDIA_URL = "/media/"
MEDIA_ROOT = BASE_DIR / "media"
"""
# --------------------------------------------------
# 5. Write file
# --------------------------------------------------
settings_path.write_text(content, encoding="utf-8")
# --------------------------------------------------
# 6. Create folders
# --------------------------------------------------
project_root = settings_path.parents[2]
ensure_dir(project_root / "static")
ensure_dir(project_root / "media")
ensure_dir(project_root / "staticfiles")
#print("✅ settings.py updated correctly")
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