style: limit line length to 79 characters

Limited the lengths of all lines to 79 characters (if possible).
Additionally, some other lines were breaked for consistence.

src/jcloud_docsgen/utils.py

@@ -38,7 +38,11 @@ class ExistingDirectory(pathlib.Path):
     '''
     def __init__(self, path, *args, **kwargs) -> None:
         if not os.path.exists(path):
-            raise FileNotFoundError(errno.ENOENT, 'no such file or directory', path)
+            raise FileNotFoundError(
+                errno.ENOENT,
+                'no such file or directory',
+                path
+            )
         if not os.path.isdir(path):
             raise NotADirectoryError(errno.ENOTDIR, 'not a directory', path)
         super().__init__(*(path, *args), **kwargs)
@@ -54,7 +58,11 @@ class ExistingFile(pathlib.Path):
     '''
     def __init__(self, path, *args, **kwargs) -> None:
         if not os.path.exists(path):
-            raise FileNotFoundError(errno.ENOENT, 'no such file or directory', path)
+            raise FileNotFoundError(
+                errno.ENOENT,
+                'no such file or directory',
+                path
+            )
         if not os.path.isfile(path):
             raise IsADirectoryError(errno.EISDIR, 'is a directory', path)
         super().__init__(*(path, *args), **kwargs)
@@ -74,7 +82,11 @@ def _quote(string: str, quotation_mark: str) -> str:
 
     return quotation_mark + string + quotation_mark
 
-def human_readable_list(ls: list, final_separator: str = 'and', quotation_mark: str = '') -> str:
+def human_readable_list(
+    ls: list,
+    final_separator: str = 'and',
+    quotation_mark: str = ''
+) -> str:
     '''
     Generates a human-readable list from a list.
 
@@ -101,7 +113,10 @@ def human_readable_list(ls: list, final_separator: str = 'and', quotation_mark:
     
     return ', '.join(
         [
-            _quote(str(obj), quotation_mark) # quote the string representation of the object
+            _quote(
+                str(obj),
+                quotation_mark
+            ) # quote the string representation of the object
             for obj in ls[:-1] # do not include the last element of the list
         ]
     ) + ' ' + final_separator + ' ' + _quote(str(ls[-1]), quotation_mark)
@@ -120,9 +135,19 @@ def _list_type_names(types: list[type]) -> list[str]:
 
     return [tp.__name__ for tp in types]
 
-def assert_that_is_instance(obj: object, class_or_tuple: Union[type, types.UnionType, tuple[type, ...]]) -> None:
+def assert_that_is_instance(
+    obj: object,
+    class_or_tuple: Union[
+        type,
+        types.UnionType,
+        tuple[type, ...]
+    ]
+) -> None:
     if not isinstance(class_or_tuple, Union[type, types.UnionType, tuple]):
-        raise TypeError(f'class_or_tuple: expected \'Union[type, types.UnionType, tuple[type, ...]]\', \'got {type(class_or_tuple).__name__}\'')
+        raise TypeError(
+            f'class_or_tuple: expected \'Union[type, types.UnionType, '
+            f'tuple[type, ...]]\', \'got {type(class_or_tuple).__name__}\''
+        )
     if not isinstance(obj, class_or_tuple):
         if isinstance(class_or_tuple, (tuple, types.UnionType)):
             if isinstance(class_or_tuple, types.UnionType):
@@ -131,10 +156,15 @@ def assert_that_is_instance(obj: object, class_or_tuple: Union[type, types.Union
                 exception_message_expected = 'either '
             else:
                 exception_message_expected = ''
-            exception_message_expected += human_readable_list(_list_type_names(class_or_tuple), 'or', '\'')
+            exception_message_expected += human_readable_list(
+                _list_type_names(class_or_tuple), 'or', '\'')
         else:
             exception_message_expected = '\'' + class_or_tuple.__name__ + '\''
-        raise TypeError(f'expected {exception_message_expected}, got \'{type(obj).__name__}\'')
+        raise TypeError(
+            f'expected {exception_message_expected}, got \'{type(
+                obj
+            ).__name__}\''
+        )
     
 def non_empty_str(value: Union[str, None]) -> Union[str, None]:
     '''
@@ -160,7 +190,10 @@ def non_empty_str(value: Union[str, None]) -> Union[str, None]:
 
     return value
 
-def get_relative_path_segments(path: pathlib.Path, root: pathlib.Path) -> list[str]:
+def get_relative_path_segments(
+    path: pathlib.Path,
+    root: pathlib.Path
+) -> list[str]:
     '''
     Returns the path segments relative to ``root``.