toml: move from toml to tomllib + tomli_w

* toml is getting removed from distributions due to being generally
  unmaintained and not support the lastest TOML standard.
* For parsing use tomllib which is included in python3.11 and tomli for
  earlier interpeter versions.
* For writing use tomli-w. tomli-w.dump() expects bytes-like objects so
  work around it to keep compatability and minimize changes elsewhere.

Signed-off-by: Alfred Wingate <parona@protonmail.com>

dotdrop/cfg_yaml.py

@@ -26,7 +26,11 @@ import io
 from copy import deepcopy
 from itertools import chain
 from ruamel.yaml import YAML as yaml
-import toml
+try:
+    import tomllib
+except ImportError:
+    import tomli as tomllib
+import tomli_w
 
 # local imports
 from dotdrop.version import __version__ as VERSION
@@ -1345,7 +1349,7 @@ class CfgYaml:
         """load from toml"""
         with open(path, 'r', encoding='utf8') as file:
             data = file.read()
-        content = toml.loads(data)
+        content = tomllib.loads(data)
         # handle inexistent dotfiles/profiles
         # since toml doesn't have a nul/nil/null/none
         if cls.key_dotfiles not in content:
@@ -1375,7 +1379,7 @@ class CfgYaml:
     @classmethod
     def __toml_dump(cls, content, file):
         """dump to toml"""
-        toml.dump(content, file)
+        file.write(tomli_w.dumps(content))
 
     ########################################################
     # templating

dotdrop/utils.py

@@ -16,6 +16,7 @@ import filecmp
 import itertools
 import shutil
 import json
+import sys
 import requests
 from packaging import version
 
@@ -393,12 +394,22 @@ def dependencies_met():
     except ImportError as exc:
         raise UnmetDependency(err) from exc
 
-    # toml
-    name = 'toml'
+    # tomli
+    if sys.version_info < (3, 11):
+        name = 'tomli'
+        err = f'missing python module \"{name}\"'
+        try:
+            import tomli
+            assert tomli
+        except ImportError as exc:
+            raise UnmetDependency(err) from exc
+
+    # tomli_w
+    name = 'tomli_w'
     err = f'missing python module \"{name}\"'
     try:
-        import toml
-        assert toml
+        import tomli_w
+        assert tomli_w
     except ImportError as exc:
         raise UnmetDependency(err) from exc