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# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
import json
import os
import platform
import subprocess
import sys
import mozfile
import mozpack.path as mozpath
from mozlint import result
from mozlint.pathutils import expand_exclusions
here = os.path.abspath(os.path.dirname(__file__))
FLAKE8_REQUIREMENTS_PATH = os.path.join(here, "flake8_requirements.txt")
FLAKE8_NOT_FOUND = """
Could not find flake8! Install flake8 and try again.
$ pip install -U --require-hashes -r {}
""".strip().format(
FLAKE8_REQUIREMENTS_PATH
)
FLAKE8_INSTALL_ERROR = """
Unable to install correct version of flake8
Try to install it manually with:
$ pip install -U --require-hashes -r {}
""".strip().format(
FLAKE8_REQUIREMENTS_PATH
)
LINE_OFFSETS = {
# continuation line under-indented for hanging indent
"E121": (-1, 2),
# continuation line missing indentation or outdented
"E122": (-1, 2),
# continuation line over-indented for hanging indent
"E126": (-1, 2),
# continuation line over-indented for visual indent
"E127": (-1, 2),
# continuation line under-indented for visual indent
"E128": (-1, 2),
# continuation line unaligned for hanging indend
"E131": (-1, 2),
# expected 1 blank line, found 0
"E301": (-1, 2),
# expected 2 blank lines, found 1
"E302": (-2, 3),
}
"""Maps a flake8 error to a lineoffset tuple.
The offset is of the form (lineno_offset, num_lines) and is passed
to the lineoffset property of an `Issue`.
"""
def default_bindir():
# We use sys.prefix to find executables as that gets modified with
# virtualenv's activate_this.py, whereas sys.executable doesn't.
if platform.system() == "Windows":
return os.path.join(sys.prefix, "Scripts")
else:
return os.path.join(sys.prefix, "bin")
class NothingToLint(Exception):
"""Exception used to bail out of flake8's internals if all the specified
files were excluded.
"""
def setup(root, **lintargs):
virtualenv_manager = lintargs["virtualenv_manager"]
try:
virtualenv_manager.install_pip_requirements(
FLAKE8_REQUIREMENTS_PATH, quiet=True
)
except subprocess.CalledProcessError:
print(FLAKE8_INSTALL_ERROR)
return 1
def lint(paths, config, **lintargs):
root = lintargs["root"]
virtualenv_bin_path = lintargs.get("virtualenv_bin_path")
config_path = os.path.join(root, ".flake8")
results = run(paths, config, **lintargs)
fixed = 0
if lintargs.get("fix"):
# fix and run again to count remaining issues
fixed = len(results)
fix_cmd = [
os.path.join(virtualenv_bin_path or default_bindir(), "autopep8"),
"--global-config",
config_path,
"--in-place",
"--recursive",
]
if config.get("exclude"):
fix_cmd.extend(["--exclude", ",".join(config["exclude"])])
subprocess.call(fix_cmd + paths)
results = run(paths, config, **lintargs)
fixed = fixed - len(results)
return {"results": results, "fixed": fixed}
def run(paths, config, **lintargs):
from flake8.main.application import Application
log = lintargs["log"]
root = lintargs["root"]
config_path = os.path.join(root, ".flake8")
# Run flake8.
app = Application()
log.debug("flake8 version={}".format(app.version))
output_file = mozfile.NamedTemporaryFile(mode="r")
flake8_cmd = [
"--config",
config_path,
"--output-file",
output_file.name,
"--format",
'{"path":"%(path)s","lineno":%(row)s,'
'"column":%(col)s,"rule":"%(code)s","message":"%(text)s"}',
"--filename",
",".join(["*.{}".format(e) for e in config["extensions"]]),
]
log.debug("Command: {}".format(" ".join(flake8_cmd)))
orig_make_file_checker_manager = app.make_file_checker_manager
def wrap_make_file_checker_manager(self):
"""Flake8 is very inefficient when it comes to applying exclusion
rules, using `expand_exclusions` to turn directories into a list of
relevant python files is an order of magnitude faster.
Hooking into flake8 here also gives us a convenient place to merge the
`exclude` rules specified in the root .flake8 with the ones added by
tools/lint/mach_commands.py.
"""
# Ignore exclude rules if `--no-filter` was passed in.
config.setdefault("exclude", [])
if lintargs.get("use_filters", True):
config["exclude"].extend(map(mozpath.normpath, self.options.exclude))
# Since we use the root .flake8 file to store exclusions, we haven't
# properly filtered the paths through mozlint's `filterpaths` function
# yet. This mimics that though there could be other edge cases that are
# different. Maybe we should call `filterpaths` directly, though for
# now that doesn't appear to be necessary.
filtered = [
p for p in paths if not any(p.startswith(e) for e in config["exclude"])
]
self.args = self.args + list(expand_exclusions(filtered, config, root))
if not self.args:
raise NothingToLint
return orig_make_file_checker_manager()
app.make_file_checker_manager = wrap_make_file_checker_manager.__get__(
app, Application
)
# Make sure to run from repository root so exclusions are joined to the
# repository root and not the current working directory.
oldcwd = os.getcwd()
os.chdir(root)
try:
app.run(flake8_cmd)
except NothingToLint:
pass
finally:
os.chdir(oldcwd)
results = []
def process_line(line):
# Escape slashes otherwise JSON conversion will not work
line = line.replace("\\", "\\\\")
try:
res = json.loads(line)
except ValueError:
print("Non JSON output from linter, will not be processed: {}".format(line))
return
if res.get("code") in LINE_OFFSETS:
res["lineoffset"] = LINE_OFFSETS[res["code"]]
results.append(result.from_config(config, **res))
list(map(process_line, output_file.readlines()))
return results