X-Git-Url: https://git.madduck.net/etc/vim.git/blobdiff_plain/07b1b2f3dd0e4f13dd5df96eb9188f3d02f5726e..affc0ec3f90803e77fbba62376e7be9b71fe0807:/black.py diff --git a/black.py b/black.py index 0aba2c5..e72db2b 100644 --- a/black.py +++ b/black.py @@ -1,18 +1,20 @@ import asyncio -import pickle from asyncio.base_events import BaseEventLoop from concurrent.futures import Executor, ProcessPoolExecutor -from enum import Enum +from datetime import datetime +from enum import Enum, Flag from functools import partial, wraps +import io import keyword import logging from multiprocessing import Manager import os from pathlib import Path +import pickle import re -import tokenize import signal import sys +import tokenize from typing import ( Any, Callable, @@ -44,14 +46,19 @@ from blib2to3.pgen2 import driver, token from blib2to3.pgen2.parse import ParseError -__version__ = "18.5b0" +__version__ = "18.6b1" DEFAULT_LINE_LENGTH = 88 +DEFAULT_EXCLUDES = ( + r"/(\.git|\.hg|\.mypy_cache|\.tox|\.venv|_build|buck-out|build|dist)/" +) +DEFAULT_INCLUDES = r"\.pyi?$" CACHE_DIR = Path(user_cache_dir("black", version=__version__)) # types FileContent = str Encoding = str +NewLine = str Depth = int NodeType = int LeafID = int @@ -115,6 +122,13 @@ class WriteBack(Enum): YES = 1 DIFF = 2 + @classmethod + def from_configuration(cls, *, check: bool, diff: bool) -> "WriteBack": + if check and not diff: + return cls.NO + + return cls.DIFF if diff else cls.YES + class Changed(Enum): NO = 0 @@ -122,6 +136,26 @@ class Changed(Enum): YES = 2 +class FileMode(Flag): + AUTO_DETECT = 0 + PYTHON36 = 1 + PYI = 2 + NO_STRING_NORMALIZATION = 4 + + @classmethod + def from_configuration( + cls, *, py36: bool, pyi: bool, skip_string_normalization: bool + ) -> "FileMode": + mode = cls.AUTO_DETECT + if py36: + mode |= cls.PYTHON36 + if pyi: + mode |= cls.PYI + if skip_string_normalization: + mode |= cls.NO_STRING_NORMALIZATION + return mode + + @click.command() @click.option( "-l", @@ -131,6 +165,29 @@ class Changed(Enum): help="How many character per line to allow.", show_default=True, ) +@click.option( + "--py36", + is_flag=True, + help=( + "Allow using Python 3.6-only syntax on all input files. This will put " + "trailing commas in function signatures and calls also after *args and " + "**kwargs. [default: per-file auto-detection]" + ), +) +@click.option( + "--pyi", + is_flag=True, + help=( + "Format all input files like typing stubs regardless of file extension " + "(useful when piping source on standard input)." + ), +) +@click.option( + "-S", + "--skip-string-normalization", + is_flag=True, + help="Don't normalize string quotes or prefixes.", +) @click.option( "--check", is_flag=True, @@ -150,6 +207,31 @@ class Changed(Enum): is_flag=True, help="If --fast given, skip temporary sanity checks. [default: --safe]", ) +@click.option( + "--include", + type=str, + default=DEFAULT_INCLUDES, + help=( + "A regular expression that matches files and directories that should be " + "included on recursive searches. An empty value means all files are " + "included regardless of the name. Use forward slashes for directories on " + "all platforms (Windows, too). Exclusions are calculated first, inclusions " + "later." + ), + show_default=True, +) +@click.option( + "--exclude", + type=str, + default=DEFAULT_EXCLUDES, + help=( + "A regular expression that matches files and directories that should be " + "excluded on recursive searches. An empty value means no paths are excluded. " + "Use forward slashes for directories on all platforms (Windows, too). " + "Exclusions are calculated first, inclusions later." + ), + show_default=True, +) @click.option( "-q", "--quiet", @@ -160,16 +242,12 @@ class Changed(Enum): ), ) @click.option( - "--pyi", - is_flag=True, - help="Force pyi (stub file) formatting, regardless of file extension.", -) -@click.option( - "--py36", + "-v", + "--verbose", is_flag=True, help=( - "Force Python 3.6 mode, even if file doesn't currently use " - "Python 3.6-only syntax." + "Also emit messages to stderr about files that were not changed or were " + "ignored due to --exclude=." ), ) @click.version_option(version=__version__) @@ -189,43 +267,55 @@ def main( fast: bool, pyi: bool, py36: bool, + skip_string_normalization: bool, quiet: bool, + verbose: bool, + include: str, + exclude: str, src: List[str], ) -> None: """The uncompromising code formatter.""" - sources: List[Path] = [] + write_back = WriteBack.from_configuration(check=check, diff=diff) + mode = FileMode.from_configuration( + py36=py36, pyi=pyi, skip_string_normalization=skip_string_normalization + ) + report = Report(check=check, quiet=quiet, verbose=verbose) + sources: Set[Path] = set() + try: + include_regex = re.compile(include) + except re.error: + err(f"Invalid regular expression for include given: {include!r}") + ctx.exit(2) + try: + exclude_regex = re.compile(exclude) + except re.error: + err(f"Invalid regular expression for exclude given: {exclude!r}") + ctx.exit(2) + root = find_project_root(src) for s in src: p = Path(s) if p.is_dir(): - sources.extend(gen_python_files_in_dir(p)) - elif p.is_file(): + sources.update( + gen_python_files_in_dir(p, root, include_regex, exclude_regex, report) + ) + elif p.is_file() or s == "-": # if a file was explicitly given, we don't care about its extension - sources.append(p) - elif s == "-": - sources.append(Path("-")) + sources.add(p) else: err(f"invalid path: {s}") - - if check and not diff: - write_back = WriteBack.NO - elif diff: - write_back = WriteBack.DIFF - else: - write_back = WriteBack.YES - report = Report(check=check, quiet=quiet) if len(sources) == 0: - out("No paths given. Nothing to do 😴") + if verbose or not quiet: + out("No paths given. Nothing to do 😴") ctx.exit(0) return elif len(sources) == 1: reformat_one( - src=sources[0], + src=sources.pop(), line_length=line_length, fast=fast, - pyi=pyi, - py36=py36, write_back=write_back, + mode=mode, report=report, ) else: @@ -237,9 +327,8 @@ def main( sources=sources, line_length=line_length, fast=fast, - pyi=pyi, - py36=py36, write_back=write_back, + mode=mode, report=report, loop=loop, executor=executor, @@ -247,9 +336,10 @@ def main( ) finally: shutdown(loop) - if not quiet: - out("All done! ✨ 🍰 ✨") - click.echo(str(report)) + if verbose or not quiet: + bang = "💥 💔 💥" if report.return_code else "✨ 🍰 ✨" + out(f"All done! {bang}") + click.secho(str(report), err=True) ctx.exit(report.return_code) @@ -257,9 +347,8 @@ def reformat_one( src: Path, line_length: int, fast: bool, - pyi: bool, - py36: bool, write_back: WriteBack, + mode: FileMode, report: "Report", ) -> None: """Reformat a single file under `src` without spawning child processes. @@ -272,43 +361,37 @@ def reformat_one( changed = Changed.NO if not src.is_file() and str(src) == "-": if format_stdin_to_stdout( - line_length=line_length, - fast=fast, - is_pyi=pyi, - force_py36=py36, - write_back=write_back, + line_length=line_length, fast=fast, write_back=write_back, mode=mode ): changed = Changed.YES else: cache: Cache = {} if write_back != WriteBack.DIFF: - cache = read_cache(line_length, pyi, py36) - src = src.resolve() - if src in cache and cache[src] == get_cache_info(src): + cache = read_cache(line_length, mode) + res_src = src.resolve() + if res_src in cache and cache[res_src] == get_cache_info(res_src): changed = Changed.CACHED if changed is not Changed.CACHED and format_file_in_place( src, line_length=line_length, fast=fast, - force_pyi=pyi, - force_py36=py36, write_back=write_back, + mode=mode, ): changed = Changed.YES if write_back == WriteBack.YES and changed is not Changed.NO: - write_cache(cache, [src], line_length, pyi, py36) + write_cache(cache, [src], line_length, mode) report.done(src, changed) except Exception as exc: report.failed(src, str(exc)) async def schedule_formatting( - sources: List[Path], + sources: Set[Path], line_length: int, fast: bool, - pyi: bool, - py36: bool, write_back: WriteBack, + mode: FileMode, report: "Report", loop: BaseEventLoop, executor: Executor, @@ -322,9 +405,9 @@ async def schedule_formatting( """ cache: Cache = {} if write_back != WriteBack.DIFF: - cache = read_cache(line_length, pyi, py36) + cache = read_cache(line_length, mode) sources, cached = filter_cached(cache, sources) - for src in cached: + for src in sorted(cached): report.done(src, Changed.CACHED) cancelled = [] formatted = [] @@ -342,9 +425,8 @@ async def schedule_formatting( src, line_length, fast, - pyi, - py36, write_back, + mode, lock, ): src for src in sorted(sources) @@ -370,16 +452,15 @@ async def schedule_formatting( if cancelled: await asyncio.gather(*cancelled, loop=loop, return_exceptions=True) if write_back == WriteBack.YES and formatted: - write_cache(cache, formatted, line_length, pyi, py36) + write_cache(cache, formatted, line_length, mode) def format_file_in_place( src: Path, line_length: int, fast: bool, - force_pyi: bool = False, - force_py36: bool = False, write_back: WriteBack = WriteBack.NO, + mode: FileMode = FileMode.AUTO_DETECT, lock: Any = None, # multiprocessing.Manager().Lock() is some crazy proxy ) -> bool: """Format file under `src` path. Return True if changed. @@ -387,32 +468,38 @@ def format_file_in_place( If `write_back` is True, write reformatted code back to stdout. `line_length` and `fast` options are passed to :func:`format_file_contents`. """ - is_pyi = force_pyi or src.suffix == ".pyi" + if src.suffix == ".pyi": + mode |= FileMode.PYI - with tokenize.open(src) as src_buffer: - src_contents = src_buffer.read() + then = datetime.utcfromtimestamp(src.stat().st_mtime) + with open(src, "rb") as buf: + src_contents, encoding, newline = decode_bytes(buf.read()) try: dst_contents = format_file_contents( - src_contents, - line_length=line_length, - fast=fast, - is_pyi=is_pyi, - force_py36=force_py36, + src_contents, line_length=line_length, fast=fast, mode=mode ) except NothingChanged: return False if write_back == write_back.YES: - with open(src, "w", encoding=src_buffer.encoding) as f: + with open(src, "w", encoding=encoding, newline=newline) as f: f.write(dst_contents) elif write_back == write_back.DIFF: - src_name = f"{src} (original)" - dst_name = f"{src} (formatted)" + now = datetime.utcnow() + src_name = f"{src}\t{then} +0000" + dst_name = f"{src}\t{now} +0000" diff_contents = diff(src_contents, dst_contents, src_name, dst_name) if lock: lock.acquire() try: - sys.stdout.write(diff_contents) + f = io.TextIOWrapper( + sys.stdout.buffer, + encoding=encoding, + newline=newline, + write_through=True, + ) + f.write(diff_contents) + f.detach() finally: if lock: lock.release() @@ -422,9 +509,8 @@ def format_file_in_place( def format_stdin_to_stdout( line_length: int, fast: bool, - is_pyi: bool = False, - force_py36: bool = False, write_back: WriteBack = WriteBack.NO, + mode: FileMode = FileMode.AUTO_DETECT, ) -> bool: """Format file on stdin. Return True if changed. @@ -432,28 +518,28 @@ def format_stdin_to_stdout( `line_length`, `fast`, `is_pyi`, and `force_py36` arguments are passed to :func:`format_file_contents`. """ - src = sys.stdin.read() + then = datetime.utcnow() + src, encoding, newline = decode_bytes(sys.stdin.buffer.read()) dst = src try: - dst = format_file_contents( - src, - line_length=line_length, - fast=fast, - is_pyi=is_pyi, - force_py36=force_py36, - ) + dst = format_file_contents(src, line_length=line_length, fast=fast, mode=mode) return True except NothingChanged: return False finally: + f = io.TextIOWrapper( + sys.stdout.buffer, encoding=encoding, newline=newline, write_through=True + ) if write_back == WriteBack.YES: - sys.stdout.write(dst) + f.write(dst) elif write_back == WriteBack.DIFF: - src_name = " (original)" - dst_name = " (formatted)" - sys.stdout.write(diff(src, dst, src_name, dst_name)) + now = datetime.utcnow() + src_name = f"STDIN\t{then} +0000" + dst_name = f"STDOUT\t{now} +0000" + f.write(diff(src, dst, src_name, dst_name)) + f.detach() def format_file_contents( @@ -461,8 +547,7 @@ def format_file_contents( *, line_length: int, fast: bool, - is_pyi: bool = False, - force_py36: bool = False, + mode: FileMode = FileMode.AUTO_DETECT, ) -> FileContent: """Reformat contents a file and return new contents. @@ -473,30 +558,18 @@ def format_file_contents( if src_contents.strip() == "": raise NothingChanged - dst_contents = format_str( - src_contents, line_length=line_length, is_pyi=is_pyi, force_py36=force_py36 - ) + dst_contents = format_str(src_contents, line_length=line_length, mode=mode) if src_contents == dst_contents: raise NothingChanged if not fast: assert_equivalent(src_contents, dst_contents) - assert_stable( - src_contents, - dst_contents, - line_length=line_length, - is_pyi=is_pyi, - force_py36=force_py36, - ) + assert_stable(src_contents, dst_contents, line_length=line_length, mode=mode) return dst_contents def format_str( - src_contents: str, - line_length: int, - *, - is_pyi: bool = False, - force_py36: bool = False, + src_contents: str, line_length: int, *, mode: FileMode = FileMode.AUTO_DETECT ) -> FileContent: """Reformat a string and return new contents. @@ -505,11 +578,15 @@ def format_str( src_node = lib2to3_parse(src_contents) dst_contents = "" future_imports = get_future_imports(src_node) - elt = EmptyLineTracker(is_pyi=is_pyi) - py36 = force_py36 or is_python36(src_node) + is_pyi = bool(mode & FileMode.PYI) + py36 = bool(mode & FileMode.PYTHON36) or is_python36(src_node) + normalize_strings = not bool(mode & FileMode.NO_STRING_NORMALIZATION) lines = LineGenerator( - remove_u_prefix=py36 or "unicode_literals" in future_imports, is_pyi=is_pyi + remove_u_prefix=py36 or "unicode_literals" in future_imports, + is_pyi=is_pyi, + normalize_strings=normalize_strings, ) + elt = EmptyLineTracker(is_pyi=is_pyi) empty_line = Line() after = 0 for current_line in lines.visit(src_node): @@ -523,6 +600,23 @@ def format_str( return dst_contents +def decode_bytes(src: bytes) -> Tuple[FileContent, Encoding, NewLine]: + """Return a tuple of (decoded_contents, encoding, newline). + + `newline` is either CRLF or LF but `decoded_contents` is decoded with + universal newlines (i.e. only contains LF). + """ + srcbuf = io.BytesIO(src) + encoding, lines = tokenize.detect_encoding(srcbuf.readline) + if not lines: + return "", encoding, "\n" + + newline = "\r\n" if b"\r\n" == lines[0][-2:] else "\n" + srcbuf.seek(0) + with io.TextIOWrapper(srcbuf, encoding) as tiow: + return tiow.read(), encoding, newline + + GRAMMARS = [ pygram.python_grammar_no_print_statement_no_exec_statement, pygram.python_grammar_no_print_statement, @@ -533,9 +627,8 @@ GRAMMARS = [ def lib2to3_parse(src_txt: str) -> Node: """Given a string with source, return the lib2to3 Node.""" grammar = pygram.python_grammar_no_print_statement - if src_txt[-1] != "\n": - nl = "\r\n" if "\r\n" in src_txt[:1024] else "\n" - src_txt += nl + if src_txt[-1:] != "\n": + src_txt += "\n" for grammar in GRAMMARS: drv = driver.Driver(grammar, pytree.convert) try: @@ -679,6 +772,7 @@ UNPACKING_PARENTS = { syms.dictsetmaker, syms.listmaker, syms.testlist_gexp, + syms.testlist_star_expr, } TEST_DESCENDANTS = { syms.test, @@ -967,27 +1061,6 @@ class Line: and second_leaf.value == "def" ) - @property - def is_flow_control(self) -> bool: - """Is this line a flow control statement? - - Those are `return`, `raise`, `break`, and `continue`. - """ - return ( - bool(self) - and self.leaves[0].type == token.NAME - and self.leaves[0].value in FLOW_CONTROL - ) - - @property - def is_yield(self) -> bool: - """Is this line a yield statement?""" - return ( - bool(self) - and self.leaves[0].type == token.NAME - and self.leaves[0].value == "yield" - ) - @property def is_class_paren_empty(self) -> bool: """Is this a class with no base classes but using parentheses? @@ -1004,6 +1077,15 @@ class Line: and self.leaves[3].value == ")" ) + @property + def is_triple_quoted_string(self) -> bool: + """Is the line a triple quoted string?""" + return ( + bool(self) + and self.leaves[0].type == token.STRING + and self.leaves[0].value.startswith(('"""', "'''")) + ) + def contains_standalone_comments(self, depth_limit: int = sys.maxsize) -> bool: """If so, needs to be split before emitting.""" for leaf in self.leaves: @@ -1013,6 +1095,13 @@ class Line: return False + def contains_multiline_strings(self) -> bool: + for leaf in self.leaves: + if is_multiline_string(leaf): + return True + + return False + def maybe_remove_trailing_comma(self, closing: Leaf) -> bool: """Remove trailing comma if there is one and it's safe.""" if not ( @@ -1211,6 +1300,7 @@ class EmptyLineTracker: the prefix of the first leaf consists of optional newlines. Those newlines are consumed by `maybe_empty_lines()` and included in the computation. """ + is_pyi: bool = False previous_line: Optional[Line] = None previous_after: int = 0 @@ -1220,8 +1310,7 @@ class EmptyLineTracker: """Return the number of extra empty lines before and after the `current_line`. This is for separating `def`, `async def` and `class` with extra empty - lines (two on module-level), as well as providing an extra empty line - after flow control keywords to make them more prominent. + lines (two on module-level). """ if isinstance(current_line, UnformattedLines): return 0, 0 @@ -1262,6 +1351,11 @@ class EmptyLineTracker: if self.previous_line.is_decorator: return 0, 0 + if self.previous_line.depth < current_line.depth and ( + self.previous_line.is_class or self.previous_line.is_def + ): + return 0, 0 + if ( self.previous_line.is_comment and self.previous_line.depth == current_line.depth @@ -1293,6 +1387,13 @@ class EmptyLineTracker: ): return (before or 1), 0 + if ( + self.previous_line + and self.previous_line.is_class + and current_line.is_triple_quoted_string + ): + return before, 1 + return before, 0 @@ -1303,7 +1404,9 @@ class LineGenerator(Visitor[Line]): Note: destroys the tree it's visiting by mutating prefixes of its leaves in ways that will no longer stringify to valid Python code on the tree. """ + is_pyi: bool = False + normalize_strings: bool = True current_line: Line = Factory(Line) remove_u_prefix: bool = False @@ -1372,7 +1475,7 @@ class LineGenerator(Visitor[Line]): else: normalize_prefix(node, inside_brackets=any_open_brackets) - if node.type == token.STRING: + if self.normalize_strings and node.type == token.STRING: normalize_string_prefix(node, remove_u_prefix=self.remove_u_prefix) normalize_string_quotes(node) if node.type not in WHITESPACE: @@ -1732,7 +1835,7 @@ def whitespace(leaf: Leaf, *, complex_subscript: bool) -> str: # noqa C901 elif prevp.type == token.EQUAL and prevp_parent.type == syms.argument: return NO - elif t == token.NAME or t == token.NUMBER: + elif t in {token.NAME, token.NUMBER, token.STRING}: return NO elif p.type == syms.import_from: @@ -2118,32 +2221,50 @@ def right_hand_split( result.append(leaf, preformatted=True) for comment_after in line.comments_after(leaf): result.append(comment_after, preformatted=True) - bracket_split_succeeded_or_raise(head, body, tail) assert opening_bracket and closing_bracket + body.should_explode = should_explode(body, opening_bracket) + bracket_split_succeeded_or_raise(head, body, tail) if ( + # the body shouldn't be exploded + not body.should_explode # the opening bracket is an optional paren - opening_bracket.type == token.LPAR + and opening_bracket.type == token.LPAR and not opening_bracket.value # the closing bracket is an optional paren and closing_bracket.type == token.RPAR and not closing_bracket.value - # there are no standalone comments in the body - and not line.contains_standalone_comments(0) - # and it's not an import (optional parens are the only thing we can split - # on in this case; attempting a split without them is a waste of time) + # it's not an import (optional parens are the only thing we can split on + # in this case; attempting a split without them is a waste of time) and not line.is_import + # there are no standalone comments in the body + and not body.contains_standalone_comments(0) + # and we can actually remove the parens + and can_omit_invisible_parens(body, line_length) ): omit = {id(closing_bracket), *omit} - if can_omit_invisible_parens(body, line_length): - try: - yield from right_hand_split(line, line_length, py36=py36, omit=omit) - return - except CannotSplit: - pass + try: + yield from right_hand_split(line, line_length, py36=py36, omit=omit) + return + + except CannotSplit: + if not ( + can_be_split(body) + or is_line_short_enough(body, line_length=line_length) + ): + raise CannotSplit( + "Splitting failed, body is still too long and can't be split." + ) + + elif head.contains_multiline_strings() or tail.contains_multiline_strings(): + raise CannotSplit( + "The current optional pair of parentheses is bound to fail to " + "satisfy the splitting algorithm because the head or the tail " + "contains multiline strings which by definition never fit one " + "line." + ) ensure_visible(opening_bracket) ensure_visible(closing_bracket) - body.should_explode = should_explode(body, opening_bracket) for result in (head, body, tail): if result: yield result @@ -2441,7 +2562,7 @@ def normalize_invisible_parens(node: Node, parens_after: Set[str]) -> None: def maybe_make_parens_invisible_in_atom(node: LN) -> bool: - """If it's safe, make the parens in the atom `node` invisible, recusively.""" + """If it's safe, make the parens in the atom `node` invisible, recursively.""" if ( node.type != syms.atom or is_empty_tuple(node) @@ -2754,40 +2875,73 @@ def get_future_imports(node: Node) -> Set[str]: return imports -PYTHON_EXTENSIONS = {".py", ".pyi"} -BLACKLISTED_DIRECTORIES = { - "build", - "buck-out", - "dist", - "_build", - ".git", - ".hg", - ".mypy_cache", - ".tox", - ".venv", -} - +def gen_python_files_in_dir( + path: Path, + root: Path, + include: Pattern[str], + exclude: Pattern[str], + report: "Report", +) -> Iterator[Path]: + """Generate all files under `path` whose paths are not excluded by the + `exclude` regex, but are included by the `include` regex. -def gen_python_files_in_dir(path: Path) -> Iterator[Path]: - """Generate all files under `path` which aren't under BLACKLISTED_DIRECTORIES - and have one of the PYTHON_EXTENSIONS. + `report` is where output about exclusions goes. """ + assert root.is_absolute(), f"INTERNAL ERROR: `root` must be absolute but is {root}" for child in path.iterdir(): + normalized_path = "/" + child.resolve().relative_to(root).as_posix() if child.is_dir(): - if child.name in BLACKLISTED_DIRECTORIES: - continue + normalized_path += "/" + exclude_match = exclude.search(normalized_path) + if exclude_match and exclude_match.group(0): + report.path_ignored(child, f"matches --exclude={exclude.pattern}") + continue + + if child.is_dir(): + yield from gen_python_files_in_dir(child, root, include, exclude, report) + + elif child.is_file(): + include_match = include.search(normalized_path) + if include_match: + yield child + + +def find_project_root(srcs: List[str]) -> Path: + """Return a directory containing .git, .hg, or pyproject.toml. + + That directory can be one of the directories passed in `srcs` or their + common parent. + + If no directory in the tree contains a marker that would specify it's the + project root, the root of the file system is returned. + """ + if not srcs: + return Path("/").resolve() + + common_base = min(Path(src).resolve() for src in srcs) + if common_base.is_dir(): + # Append a fake file so `parents` below returns `common_base_dir`, too. + common_base /= "fake-file" + for directory in common_base.parents: + if (directory / ".git").is_dir(): + return directory + + if (directory / ".hg").is_dir(): + return directory - yield from gen_python_files_in_dir(child) + if (directory / "pyproject.toml").is_file(): + return directory - elif child.is_file() and child.suffix in PYTHON_EXTENSIONS: - yield child + return directory @dataclass class Report: """Provides a reformatting counter. Can be rendered with `str(report)`.""" + check: bool = False quiet: bool = False + verbose: bool = False change_count: int = 0 same_count: int = 0 failure_count: int = 0 @@ -2796,11 +2950,11 @@ class Report: """Increment the counter for successful reformatting. Write out a message.""" if changed is Changed.YES: reformatted = "would reformat" if self.check else "reformatted" - if not self.quiet: + if self.verbose or not self.quiet: out(f"{reformatted} {src}") self.change_count += 1 else: - if not self.quiet: + if self.verbose: if changed is Changed.NO: msg = f"{src} already well formatted, good job." else: @@ -2813,6 +2967,10 @@ class Report: err(f"error: cannot format {src}: {message}") self.failure_count += 1 + def path_ignored(self, path: Path, message: str) -> None: + if self.verbose: + out(f"{path} ignored: {message}", bold=False) + @property def return_code(self) -> int: """Return the exit code that the app should use. @@ -2926,12 +3084,10 @@ def assert_equivalent(src: str, dst: str) -> None: def assert_stable( - src: str, dst: str, line_length: int, is_pyi: bool = False, force_py36: bool = False + src: str, dst: str, line_length: int, mode: FileMode = FileMode.AUTO_DETECT ) -> None: """Raise AssertionError if `dst` reformats differently the second time.""" - newdst = format_str( - dst, line_length=line_length, is_pyi=is_pyi, force_py36=force_py36 - ) + newdst = format_str(dst, line_length=line_length, mode=mode) if dst != newdst: log = dump_to_file( diff(src, dst, "source", "first pass"), @@ -3053,6 +3209,42 @@ def is_line_short_enough(line: Line, *, line_length: int, line_str: str = "") -> ) +def can_be_split(line: Line) -> bool: + """Return False if the line cannot be split *for sure*. + + This is not an exhaustive search but a cheap heuristic that we can use to + avoid some unfortunate formattings (mostly around wrapping unsplittable code + in unnecessary parentheses). + """ + leaves = line.leaves + if len(leaves) < 2: + return False + + if leaves[0].type == token.STRING and leaves[1].type == token.DOT: + call_count = 0 + dot_count = 0 + next = leaves[-1] + for leaf in leaves[-2::-1]: + if leaf.type in OPENING_BRACKETS: + if next.type not in CLOSING_BRACKETS: + return False + + call_count += 1 + elif leaf.type == token.DOT: + dot_count += 1 + elif leaf.type == token.NAME: + if not (next.type == token.DOT or next.type in OPENING_BRACKETS): + return False + + elif leaf.type not in CLOSING_BRACKETS: + return False + + if dot_count > 1 and call_count > 1: + return False + + return True + + def can_omit_invisible_parens(line: Line, line_length: int) -> bool: """Does `line` have a shape safe to reformat without optional parens around it? @@ -3142,19 +3334,21 @@ def can_omit_invisible_parens(line: Line, line_length: int) -> bool: return False -def get_cache_file(line_length: int, pyi: bool = False, py36: bool = False) -> Path: +def get_cache_file(line_length: int, mode: FileMode) -> Path: + pyi = bool(mode & FileMode.PYI) + py36 = bool(mode & FileMode.PYTHON36) return ( CACHE_DIR / f"cache.{line_length}{'.pyi' if pyi else ''}{'.py36' if py36 else ''}.pickle" ) -def read_cache(line_length: int, pyi: bool = False, py36: bool = False) -> Cache: +def read_cache(line_length: int, mode: FileMode) -> Cache: """Read the cache if it exists and is well formed. If it is not well formed, the call to write_cache later should resolve the issue. """ - cache_file = get_cache_file(line_length, pyi, py36) + cache_file = get_cache_file(line_length, mode) if not cache_file.exists(): return {} @@ -3173,33 +3367,27 @@ def get_cache_info(path: Path) -> CacheInfo: return stat.st_mtime, stat.st_size -def filter_cached( - cache: Cache, sources: Iterable[Path] -) -> Tuple[List[Path], List[Path]]: - """Split a list of paths into two. +def filter_cached(cache: Cache, sources: Iterable[Path]) -> Tuple[Set[Path], Set[Path]]: + """Split an iterable of paths in `sources` into two sets. - The first list contains paths of files that modified on disk or are not in the - cache. The other list contains paths to non-modified files. + The first contains paths of files that modified on disk or are not in the + cache. The other contains paths to non-modified files. """ - todo, done = [], [] + todo, done = set(), set() for src in sources: src = src.resolve() if cache.get(src) != get_cache_info(src): - todo.append(src) + todo.add(src) else: - done.append(src) + done.add(src) return todo, done def write_cache( - cache: Cache, - sources: List[Path], - line_length: int, - pyi: bool = False, - py36: bool = False, + cache: Cache, sources: Iterable[Path], line_length: int, mode: FileMode ) -> None: """Update the cache file.""" - cache_file = get_cache_file(line_length, pyi, py36) + cache_file = get_cache_file(line_length, mode) try: if not CACHE_DIR.exists(): CACHE_DIR.mkdir(parents=True)