refactor: do not guess if changelog format is provided

Author: bearomorphism

commitizen/changelog_formats/__init__.py

@@ -1,7 +1,7 @@
 from __future__ import annotations
 
 import sys
-from typing import ClassVar, Protocol
+from typing import Callable, ClassVar, Protocol
 
 if sys.version_info >= (3, 10):
     from importlib import metadata
@@ -64,18 +64,17 @@ def get_changelog_format(
     :raises FormatUnknown: if a non-empty name is provided but cannot be found in the known formats
     """
     name: str | None = config.settings.get("changelog_format")
-    format: type[ChangelogFormat] | None = guess_changelog_format(filename)
-
-    if name and name in KNOWN_CHANGELOG_FORMATS:
-        format = KNOWN_CHANGELOG_FORMATS[name]
+    format = (
+        name and KNOWN_CHANGELOG_FORMATS.get(name) or _guess_changelog_format(filename)
+    )
 
     if not format:
         raise ChangelogFormatUnknown(f"Unknown changelog format '{name}'")
 
     return format(config)
 
 
-def guess_changelog_format(filename: str | None) -> type[ChangelogFormat] | None:
+def _guess_changelog_format(filename: str | None) -> type[ChangelogFormat] | None:
     """
     Try guessing the file format from the filename.
 
@@ -91,3 +90,9 @@ def guess_changelog_format(filename: str | None) -> type[ChangelogFormat] | None
             if filename.endswith(f".{alt_extension}"):
                 return format
     return None
+
+
+def __getattr__(name: str) -> Callable[[str], type[ChangelogFormat] | None]:
+    if name == "guess_changelog_format":
+        return _guess_changelog_format
+    raise AttributeError(f"module {__name__} has no attribute {name}")

commitizen/factory.py

@@ -8,12 +8,10 @@ def committer_factory(config: BaseConfig) -> BaseCommitizen:
     """Return the correct commitizen existing in the registry."""
     name: str = config.settings["name"]
     try:
-        _cz = registry[name](config)
+        return registry[name](config)
     except KeyError:
         msg_error = (
             "The committer has not been found in the system.\n\n"
             f"Try running 'pip install {name}'\n"
         )
         raise NoCommitizenFoundException(msg_error)
-    else:
-        return _cz

tests/test_changelog_formats.py

@@ -6,23 +6,23 @@
 from commitizen.changelog_formats import (
     KNOWN_CHANGELOG_FORMATS,
     ChangelogFormat,
+    _guess_changelog_format,
     get_changelog_format,
-    guess_changelog_format,
 )
 from commitizen.config.base_config import BaseConfig
 from commitizen.exceptions import ChangelogFormatUnknown
 
 
 @pytest.mark.parametrize("format", KNOWN_CHANGELOG_FORMATS.values())
 def test_guess_format(format: type[ChangelogFormat]):
-    assert guess_changelog_format(f"CHANGELOG.{format.extension}") is format
+    assert _guess_changelog_format(f"CHANGELOG.{format.extension}") is format
     for ext in format.alternative_extensions:
-        assert guess_changelog_format(f"CHANGELOG.{ext}") is format
+        assert _guess_changelog_format(f"CHANGELOG.{ext}") is format
 
 
 @pytest.mark.parametrize("filename", ("CHANGELOG", "NEWS", "file.unknown", None))
 def test_guess_format_unknown(filename: str):
-    assert guess_changelog_format(filename) is None
+    assert _guess_changelog_format(filename) is None
 
 
 @pytest.mark.parametrize(

tests/test_defaults.py tests/test_deprecated.pytests/test_defaults.py renamed to tests/test_deprecated.py

@@ -1,6 +1,6 @@
 import pytest
 
-from commitizen import defaults
+from commitizen import changelog_formats, defaults
 
 
 def test_getattr_deprecated_vars():
@@ -15,6 +15,10 @@ def test_getattr_deprecated_vars():
         assert defaults.change_type_order == defaults.CHANGE_TYPE_ORDER
         assert defaults.encoding == defaults.ENCODING
         assert defaults.name == defaults.DEFAULT_SETTINGS["name"]
+        assert (
+            changelog_formats._guess_changelog_format
+            == changelog_formats.guess_changelog_format
+        )
 
     # Verify warning messages
     assert len(record) == 7