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"""Default formatting class for Flake8."""
from typing import Optional
from typing import Set
from flake8.formatting import base
from flake8.violation import Violation
COLORS = {
"bold": "\033[1m",
"black": "\033[30m",
"red": "\033[31m",
"green": "\033[32m",
"yellow": "\033[33m",
"blue": "\033[34m",
"magenta": "\033[35m",
"cyan": "\033[36m",
"white": "\033[37m",
"reset": "\033[m",
}
COLORS_OFF = {k: "" for k in COLORS}
class SimpleFormatter(base.BaseFormatter):
"""Simple abstraction for Default and Pylint formatter commonality.
Sub-classes of this need to define an ``error_format`` attribute in order
to succeed. The ``format`` method relies on that attribute and expects the
``error_format`` string to use the old-style formatting strings with named
parameters:
* code
* text
* path
* row
* col
"""
error_format: str
def format(self, error: "Violation") -> Optional[str]:
"""Format and write error out.
If an output filename is specified, write formatted errors to that
file. Otherwise, print the formatted error to standard out.
"""
return self.error_format % {
"code": error.code,
"text": error.text,
"path": error.filename,
"row": error.line_number,
"col": error.column_number,
**(COLORS if self.color else COLORS_OFF),
}
class Default(SimpleFormatter):
"""Default formatter for Flake8.
This also handles backwards compatibility for people specifying a custom
format string.
"""
error_format = (
"%(bold)s%(path)s%(reset)s"
"%(cyan)s:%(reset)s%(row)d%(cyan)s:%(reset)s%(col)d%(cyan)s:%(reset)s "
"%(bold)s%(red)s%(code)s%(reset)s %(text)s"
)
def after_init(self) -> None:
"""Check for a custom format string."""
if self.options.format.lower() != "default":
self.error_format = self.options.format
class Pylint(SimpleFormatter):
"""Pylint formatter for Flake8."""
error_format = "%(path)s:%(row)d: [%(code)s] %(text)s"
class FilenameOnly(SimpleFormatter):
"""Only print filenames, e.g., flake8 -q."""
error_format = "%(path)s"
def after_init(self) -> None:
"""Initialize our set of filenames."""
self.filenames_already_printed: Set[str] = set()
def show_source(self, error: "Violation") -> Optional[str]:
"""Do not include the source code."""
def format(self, error: "Violation") -> Optional[str]:
"""Ensure we only print each error once."""
if error.filename not in self.filenames_already_printed:
self.filenames_already_printed.add(error.filename)
return super().format(error)
else:
return None
class Nothing(base.BaseFormatter):
"""Print absolutely nothing."""
def format(self, error: "Violation") -> Optional[str]:
"""Do nothing."""
def show_source(self, error: "Violation") -> Optional[str]:
"""Do not print the source."""