djavu-asus/emacs/elpa/elpy-20230803.1455/elpy/blackutil.py

   1 """Glue for the "black" library.
   2
   3 """
   4
   5 import sys
   6
   7 from elpy.rpc import Fault
   8 # in case pkg_resources is not properly installed
   9 # (see https://github.com/jorgenschaefer/elpy/issues/1674).
  10 try:
  11     from pkg_resources import parse_version
  12 except ImportError:  # pragma: no cover
  13     def parse_version(*arg, **kwargs):
  14         raise Fault("`pkg_resources` could not be imported, "
  15                     "please reinstall Elpy RPC virtualenv with"
  16                     " `M-x elpy-rpc-reinstall-virtualenv`", code=400)
  17
  18 import os
  19
  20 try:
  21     import toml
  22 except ImportError:
  23     toml = None
  24
  25
  26 BLACK_NOT_SUPPORTED = sys.version_info < (3, 6)
  27
  28 try:
  29     if BLACK_NOT_SUPPORTED:  # pragma: no cover
  30         black = None
  31     else:
  32         import black
  33         current_version = parse_version(black.__version__)
  34         if current_version >= parse_version("21.5b1"):
  35             from black.files import find_pyproject_toml
  36         elif current_version >= parse_version("20.8b0"):
  37             from black import find_pyproject_toml
  38         else:
  39             find_pyproject_toml = None
  40
  41 except ImportError:  # pragma: no cover
  42     black = None
  43
  44
  45 def fix_code(code, directory):
  46     """Formats Python code to conform to the PEP 8 style guide.
  47
  48     """
  49     if not black:
  50         raise Fault("black not installed", code=400)
  51     # Get black config from pyproject.toml
  52     line_length = black.DEFAULT_LINE_LENGTH
  53     string_normalization = True
  54     if find_pyproject_toml:
  55         pyproject_path = find_pyproject_toml((directory,))
  56     else:
  57         pyproject_path = os.path.join(directory, "pyproject.toml")
  58     if toml and pyproject_path and os.path.exists(pyproject_path):
  59         pyproject_config = toml.load(pyproject_path)
  60         black_config = pyproject_config.get("tool", {}).get("black", {})
  61         if "line-length" in black_config:
  62             line_length = black_config["line-length"]
  63         if "skip-string-normalization" in black_config:
  64             string_normalization = not black_config["skip-string-normalization"]
  65     try:
  66         if parse_version(black.__version__) < parse_version("19.0"):
  67             reformatted_source = black.format_file_contents(
  68                 src_contents=code, line_length=line_length, fast=False)
  69         else:
  70             fm = black.FileMode(
  71                 line_length=line_length,
  72                 string_normalization=string_normalization)
  73             reformatted_source = black.format_file_contents(
  74                 src_contents=code, fast=False, mode=fm)
  75         return reformatted_source
  76     except black.NothingChanged:
  77         return code
  78     except Exception as e:
  79         raise Fault("Error during formatting: {}".format(e), code=400)