Add new function: get_col_outline_level (#10)

- Update unie tests

Author: hly-717

excelize.py

@@ -1536,6 +1536,35 @@ def get_cell_value(
         err = res.err.decode(ENCODE)
         return res.val.decode(ENCODE), None if err == "" else Exception(err)
 
+    def get_col_outline_level(
+        self, sheet: str, col: str
+    ) -> Tuple[int, Optional[Exception]]:
+        """
+        Get outline level of a single column by given worksheet name and column
+        name.
+        
+        Args:
+            sheet (str): The worksheet name
+            col (str): The column name
+
+        Returns:
+            Tuple[int, Optional[Exception]]: A tuple containing the column
+            outline level and an exception if an error occurred, otherwise None.
+
+        Example:
+            For example, get outline level of column D in Sheet1:
+
+            .. code-block:: python
+
+        	level, err = f.get_col_outline_level("Sheet1", "D")
+        """
+        lib.GetColOutlineLevel.restype = types_go._IntErrorResult
+        res = lib.GetColOutlineLevel(
+            self.file_index, sheet.encode(ENCODE), col.encode(ENCODE)
+        )
+        err = res.err.decode(ENCODE)
+        return res.val, None if err == "" else Exception(err)
+
     def get_col_style(self, sheet: str, col: str) -> Tuple[int, Optional[Exception]]:
         """
         Get column style ID by given worksheet name and column name.

main.go

@@ -1126,6 +1126,22 @@ func GetCellValue(idx int, sheet, cell *C.char, opts *C.struct_Options) C.struct
 	return C.struct_StringErrorResult{val: C.CString(val), err: C.CString(emptyString)}
 }
 
+// GetColOutlineLevel provides a function to get outline level of a single
+// column by given worksheet name and column name.
+//
+//export GetColOutlineLevel
+func GetColOutlineLevel(idx int, sheet, col *C.char) C.struct_IntErrorResult {
+	f, ok := files.Load(idx)
+	if !ok {
+		return C.struct_IntErrorResult{val: C.int(0), err: C.CString(errFilePtr)}
+	}
+	val, err := f.(*excelize.File).GetColOutlineLevel(C.GoString(sheet), C.GoString(col))
+	if err != nil {
+		return C.struct_IntErrorResult{val: C.int(int32(val)), err: C.CString(err.Error())}
+	}
+	return C.struct_IntErrorResult{val: C.int(int32(val)), err: C.CString(emptyString)}
+}
+
 // GetColStyle provides a function to get column style ID by given worksheet
 // name and column name. This function is concurrency safe.
 //

test_excelize.py

@@ -288,6 +288,9 @@ def test_style(self):
         self.assertIsNone(err)
 
         self.assertIsNone(f.set_col_outline_level("Sheet1", "D", 2))
+        level, err = f.get_col_outline_level("Sheet1", "D")
+        self.assertEqual(level, 2)
+        self.assertIsNone(err)
         self.assertIsNone(f.set_row_outline("Sheet1", 2, 1))
 
         self.assertIsNone(f.set_sheet_background("Sheet2", "chart.png"))