Fix CLI args type conversion

Signed-off-by: Bernát Gábor <[email protected]>

src/toml_fmt_common/__init__.py

@@ -6,7 +6,13 @@
 import os
 import sys
 from abc import ABC, abstractmethod
-from argparse import ArgumentDefaultsHelpFormatter, ArgumentParser, ArgumentTypeError, Namespace
+from argparse import (
+    ArgumentDefaultsHelpFormatter,
+    ArgumentParser,
+    ArgumentTypeError,
+    Namespace,
+    _ArgumentGroup,  # noqa: PLC2701
+)
 from collections import deque
 from copy import deepcopy
 from dataclasses import dataclass
@@ -16,7 +22,7 @@
 from typing import TYPE_CHECKING, Any, Generic, TypeVar
 
 if TYPE_CHECKING:
-    from collections.abc import Iterable, Sequence
+    from collections.abc import Callable, Iterable, Mapping, Sequence
 
 if sys.version_info >= (3, 11):  # pragma: >=3.11 cover
     import tomllib
@@ -63,7 +69,7 @@ def filename(self) -> str:
         raise NotImplementedError
 
     @abstractmethod
-    def add_format_flags(self, parser: ArgumentParser) -> None:
+    def add_format_flags(self, parser: _ArgumentGroup) -> None:
         """
          Add any additional flags to configure the formatter.
 
@@ -126,7 +132,7 @@ def _cli_args(info: TOMLFormatter[T], args: Sequence[str]) -> list[_Config[T]]:
     :param args: CLI arguments
     :return: the parsed options
     """
-    parser = _build_cli(info)
+    parser, type_conversion = _build_cli(info)
     parser.parse_args(namespace=info.opt, args=args)
     res = []
     for pyproject_toml in info.opt.inputs:
@@ -144,7 +150,9 @@ def _cli_args(info: TOMLFormatter[T], args: Sequence[str]) -> list[_Config[T]]:
         if isinstance(config, dict):
             for key in set(vars(override_opt).keys()) - {"inputs", "stdout", "check", "no_print_diff"}:
                 if key in config:
-                    setattr(override_opt, key, config[key])
+                    raw = config[key]
+                    converted = type_conversion[key](raw)
+                    setattr(override_opt, key, converted)
         res.append(
             _Config(
                 toml_filename=pyproject_toml,
@@ -159,7 +167,7 @@ def _cli_args(info: TOMLFormatter[T], args: Sequence[str]) -> list[_Config[T]]:
     return res
 
 
-def _build_cli(of: TOMLFormatter[T]) -> ArgumentParser:
+def _build_cli(of: TOMLFormatter[T]) -> tuple[ArgumentParser, Mapping[str, Callable[[Any], Any]]]:
     parser = ArgumentParser(
         formatter_class=ArgumentDefaultsHelpFormatter,
         prog=of.prog,
@@ -200,15 +208,16 @@ def _build_cli(of: TOMLFormatter[T]) -> ArgumentParser:
         help="number of spaces to use for indentation",
         metavar="count",
     )
-    of.add_format_flags(format_group)  # type: ignore[arg-type]
+    of.add_format_flags(format_group)
+    type_conversion = {a.dest: a.type for a in format_group._actions if a.type and a.dest}  # noqa: SLF001
     msg = "pyproject.toml file(s) to format, use '-' to read from stdin"
     parser.add_argument(
         "inputs",
         nargs="+",
         type=partial(_toml_path_creator, of.filename),
         help=msg,
     )
-    return parser
+    return parser, type_conversion
 
 
 def _toml_path_creator(filename: str, argument: str) -> Path | None:
@@ -288,7 +297,10 @@ def _color_diff(diff: Iterable[str]) -> Iterable[str]:
             yield line
 
 
+ArgumentGroup = _ArgumentGroup
+
 __all__ = [
+    "ArgumentGroup",
     "FmtNamespace",
     "TOMLFormatter",
     "run",

tests/test_app.py

@@ -6,17 +6,17 @@
 
 import pytest
 
-from toml_fmt_common import GREEN, RED, RESET, FmtNamespace, TOMLFormatter, run
+from toml_fmt_common import GREEN, RED, RESET, ArgumentGroup, FmtNamespace, TOMLFormatter, run
 
 if TYPE_CHECKING:
-    from argparse import ArgumentParser
     from pathlib import Path
 
     from pytest_mock import MockerFixture
 
 
 class DumpNamespace(FmtNamespace):
     extra: str
+    tuple_magic: tuple[str, ...]
 
 
 class Dumb(TOMLFormatter[DumpNamespace]):
@@ -35,11 +35,18 @@ def filename(self) -> str:
     def override_cli_from_section(self) -> tuple[str, ...]:
         return "start", "sub"
 
-    def add_format_flags(self, parser: ArgumentParser) -> None:  # noqa: PLR6301
+    def add_format_flags(self, parser: ArgumentGroup) -> None:  # noqa: PLR6301
         parser.add_argument("extra", help="this is something extra")
+        parser.add_argument("-t", "--tuple-magic", default=(), type=lambda t: tuple(t.split(".")))
 
     def format(self, text: str, opt: DumpNamespace) -> str:  # noqa: PLR6301
-        return text if os.environ.get("NO_FMT") else f"{text}\nextras = {opt.extra!r}"
+        if os.environ.get("NO_FMT"):
+            return text
+        return "\n".join([
+            text,
+            f"extras = {opt.extra!r}",
+            *([f"magic = {','.join(opt.tuple_magic)!r}"] if opt.tuple_magic else []),
+        ])
 
 
 def test_dumb_help(capsys: pytest.CaptureFixture[str]) -> None:
@@ -77,6 +84,31 @@ def test_dumb_format_with_override(capsys: pytest.CaptureFixture[str], tmp_path:
     ]
 
 
+def test_dumb_format_with_override_custom_type(capsys: pytest.CaptureFixture[str], tmp_path: Path) -> None:
+    dumb = tmp_path / "dumb.toml"
+    dumb.write_text("[start.sub]\ntuple_magic = '1.2.3'")
+
+    exit_code = run(Dumb(), ["E", str(dumb)])
+    assert exit_code == 1
+
+    assert dumb.read_text() == "[start.sub]\ntuple_magic = '1.2.3'\nextras = 'E'\nmagic = '1,2,3'"
+
+    out, err = capsys.readouterr()
+    assert not err
+    assert out.splitlines() == [
+        f"{RED}--- {dumb}",
+        f"{RESET}",
+        f"{GREEN}+++ {dumb}",
+        f"{RESET}",
+        "@@ -1,2 +1,4 @@",
+        "",
+        " [start.sub]",
+        " tuple_magic = '1.2.3'",
+        f"{GREEN}+extras = 'E'{RESET}",
+        f"{GREEN}+magic = '1,2,3'{RESET}",
+    ]
+
+
 def test_dumb_format_no_print_diff(capsys: pytest.CaptureFixture[str], tmp_path: Path) -> None:
     dumb = tmp_path / "dumb.toml"
     dumb.write_text("[start.sub]\nextra = 'B'")