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rules.py
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rules.py
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# Copyright 2020 Pants project contributors (see CONTRIBUTORS.md).
# Licensed under the Apache License, Version 2.0 (see LICENSE).
from dataclasses import dataclass
from typing import Tuple
from pants.backend.python.lint.docformatter.subsystem import Docformatter
from pants.backend.python.lint.python_fmt import PythonFmtRequest
from pants.backend.python.rules import download_pex_bin, pex
from pants.backend.python.rules.pex import (
Pex,
PexInterpreterConstraints,
PexRequest,
PexRequirements,
)
from pants.backend.python.subsystems import python_native_code, subprocess_environment
from pants.backend.python.subsystems.subprocess_environment import SubprocessEncodingEnvironment
from pants.backend.python.target_types import PythonSources
from pants.core.goals.fmt import FmtResult
from pants.core.goals.lint import LintRequest, LintResult, LintResults
from pants.core.util_rules import determine_source_files, strip_source_roots
from pants.core.util_rules.determine_source_files import (
AllSourceFilesRequest,
SourceFiles,
SpecifiedSourceFilesRequest,
)
from pants.engine.fs import EMPTY_SNAPSHOT, Digest, MergeDigests
from pants.engine.process import FallibleProcessResult, Process, ProcessResult
from pants.engine.rules import register_rules, rule
from pants.engine.selectors import Get, MultiGet
from pants.engine.target import FieldSetWithOrigin
from pants.engine.unions import UnionRule
from pants.python.python_setup import PythonSetup
from pants.util.strutil import pluralize
@dataclass(frozen=True)
class DocformatterFieldSet(FieldSetWithOrigin):
required_fields = (PythonSources,)
sources: PythonSources
class DocformatterRequest(PythonFmtRequest, LintRequest):
field_set_type = DocformatterFieldSet
@dataclass(frozen=True)
class SetupRequest:
request: DocformatterRequest
check_only: bool
@dataclass(frozen=True)
class Setup:
process: Process
original_digest: Digest
def generate_args(
*, specified_source_files: SourceFiles, docformatter: Docformatter, check_only: bool,
) -> Tuple[str, ...]:
return (
"--check" if check_only else "--in-place",
*docformatter.options.args,
*specified_source_files.files,
)
@rule
async def setup(
setup_request: SetupRequest,
docformatter: Docformatter,
python_setup: PythonSetup,
subprocess_encoding_environment: SubprocessEncodingEnvironment,
) -> Setup:
requirements_pex_request = Get(
Pex,
PexRequest(
output_filename="docformatter.pex",
requirements=PexRequirements(docformatter.get_requirement_specs()),
interpreter_constraints=PexInterpreterConstraints(
docformatter.default_interpreter_constraints
),
entry_point=docformatter.get_entry_point(),
),
)
all_source_files_request = Get(
SourceFiles,
AllSourceFilesRequest(field_set.sources for field_set in setup_request.request.field_sets),
)
specified_source_files_request = Get(
SourceFiles,
SpecifiedSourceFilesRequest(
(field_set.sources, field_set.origin) for field_set in setup_request.request.field_sets
),
)
requests = requirements_pex_request, specified_source_files_request
all_source_files, requirements_pex, specified_source_files = (
await MultiGet(all_source_files_request, *requests)
if setup_request.request.prior_formatter_result is None
else (SourceFiles(EMPTY_SNAPSHOT), *await MultiGet(*requests))
)
all_source_files_snapshot = (
all_source_files.snapshot
if setup_request.request.prior_formatter_result is None
else setup_request.request.prior_formatter_result
)
input_digest = await Get(
Digest, MergeDigests((all_source_files_snapshot.digest, requirements_pex.digest))
)
address_references = ", ".join(
sorted(field_set.address.reference() for field_set in setup_request.request.field_sets)
)
process = requirements_pex.create_process(
python_setup=python_setup,
subprocess_encoding_environment=subprocess_encoding_environment,
pex_path="./docformatter.pex",
pex_args=generate_args(
specified_source_files=specified_source_files,
docformatter=docformatter,
check_only=setup_request.check_only,
),
input_digest=input_digest,
output_files=all_source_files_snapshot.files,
description=(
f"Run Docformatter on {pluralize(len(setup_request.request.field_sets), 'target')}: "
f"{address_references}."
),
)
return Setup(process, original_digest=all_source_files_snapshot.digest)
@rule(desc="Format Python docstrings with docformatter")
async def docformatter_fmt(request: DocformatterRequest, docformatter: Docformatter) -> FmtResult:
if docformatter.options.skip:
return FmtResult.noop()
setup = await Get(Setup, SetupRequest(request, check_only=False))
result = await Get(ProcessResult, Process, setup.process)
return FmtResult.from_process_result(
result, original_digest=setup.original_digest, formatter_name="Docformatter"
)
@rule(desc="Lint Python docstrings with docformatter")
async def docformatter_lint(
request: DocformatterRequest, docformatter: Docformatter
) -> LintResults:
if docformatter.options.skip:
return LintResults()
setup = await Get(Setup, SetupRequest(request, check_only=True))
result = await Get(FallibleProcessResult, Process, setup.process)
return LintResults(
[LintResult.from_fallible_process_result(result, linter_name="Docformatter")]
)
def rules():
return [
*register_rules(),
UnionRule(PythonFmtRequest, DocformatterRequest),
UnionRule(LintRequest, DocformatterRequest),
*download_pex_bin.rules(),
*determine_source_files.rules(),
*pex.rules(),
*python_native_code.rules(),
*strip_source_roots.rules(),
*subprocess_environment.rules(),
]