feat(mcp): finalize Python structural tools with security checks and indentation normalization

scripts/py_struct_tools.py

@@ -39,12 +39,15 @@ def find_definition_range(source: str, symbol_path: str) -> tuple[int, int] | No
 
 def shift_indentation(content: str, target_depth: int) -> str:
  """
-    Shifts the indentation of a code block to the target depth using 1-space units.
+    Shifts and normalizes the indentation of a code block to 1-space units.
+    Detects the base indentation and scales relative indentation to 1-space.
     [C: scripts/py_struct_tools.py:py_add_def]
     """
  lines = content.splitlines()
  if not lines:
   return ""
+ 
+ # 1. Find min indent of non-empty lines
  min_indent = sys.maxsize
  for line in lines:
   if line.strip():
@@ -53,12 +56,32 @@ def shift_indentation(content: str, target_depth: int) -> str:
     min_indent = indent
  if min_indent == sys.maxsize:
   min_indent = 0
+
+ # 2. Try to detect indentation unit (width)
+ indent_unit = 0
+ for line in lines:
+  if line.strip():
+   indent = len(line) - len(line.lstrip())
+   rel_indent = indent - min_indent
+   if rel_indent > 0:
+    if indent_unit == 0:
+     indent_unit = rel_indent
+    else:
+     import math
+     indent_unit = math.gcd(indent_unit, rel_indent)
+ 
+ if indent_unit == 0:
+  indent_unit = 1
+
  shifted_lines = []
  for line in lines:
   if line.strip():
-   shifted_lines.append(" " * target_depth + line[min_indent:])
+   indent = len(line) - len(line.lstrip())
+   rel_level = (indent - min_indent) // indent_unit
+   shifted_lines.append(" " * (target_depth + rel_level) + line.lstrip())
   else:
    shifted_lines.append("")
+ 
  return "\n".join(shifted_lines) + ("\n" if content.endswith("\n") else "")
 
 def py_remove_def(filepath: str, symbol_path: str) -> str: