chore: drop astor and use ast.unparse

Signed-off-by: lafirm <136463254+lafirm@users.noreply.github.com>

Author: lafirm

pyproject.toml

@@ -7,7 +7,6 @@ authors = [{ name = "SQLMesh Contributors" }]
 license = { file = "LICENSE" }
 requires-python = ">= 3.9"
 dependencies = [
-    "astor",
     "click",
     "croniter",
     "duckdb>=0.10.0,!=0.10.3",
@@ -198,7 +197,6 @@ disable_error_code = "annotation-unchecked"
 [[tool.mypy.overrides]]
 module = [
     "api.*",
-    "astor.*",
     "IPython.*",
     "hyperscript.*",
     "py.*",

sqlmesh/core/model/common.py

@@ -4,7 +4,6 @@
 import typing as t
 from pathlib import Path
 
-from astor import to_source
 from difflib import get_close_matches
 from sqlglot import exp
 from sqlglot.helper import ensure_list
@@ -387,7 +386,7 @@ def get_first_arg(keyword_arg_name: str) -> t.Any:
                         )
 
                     try:
-                        expression = to_source(first_arg)
+                        expression = ast.unparse(t.cast(ast.expr, first_arg))
                         return eval(expression, env, local_env)
                     except Exception:
                         if strict_resolution:

sqlmesh/utils/metaprogramming.py

@@ -17,8 +17,6 @@
 from numbers import Number
 from pathlib import Path
 
-from astor import to_source
-
 from sqlmesh.core import constants as c
 from sqlmesh.utils import format_exception, unique
 from sqlmesh.utils.errors import SQLMeshError
@@ -274,7 +272,7 @@ def normalize_source(obj: t.Any) -> str:
             if isinstance(node, ast.FunctionDef):
                 node.returns = None
 
-    return to_source(root_node).strip()
+    return ast.unparse(root_node).strip()
 
 
 def build_env(