X-Git-Url: https://git.madduck.net/etc/vim.git/blobdiff_plain/ed91dd4de63215aa3dde1f6da8659fb35ff191d8..e4340f5c3edcfc2b7ee1ebad4521eeb6deb616df:/black.py diff --git a/black.py b/black.py index 7df98b7..f51b10e 100644 --- a/black.py +++ b/black.py @@ -1,19 +1,20 @@ import asyncio -import pickle from asyncio.base_events import BaseEventLoop from concurrent.futures import Executor, ProcessPoolExecutor +from datetime import datetime from enum import Enum, Flag -from functools import partial, wraps +from functools import lru_cache, 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, @@ -37,6 +38,7 @@ from typing import ( from appdirs import user_cache_dir from attr import dataclass, Factory import click +import toml # lib2to3 fork from blib2to3.pytree import Node, Leaf, type_repr @@ -45,7 +47,7 @@ from blib2to3.pgen2 import driver, token from blib2to3.pgen2.parse import ParseError -__version__ = "18.5b1" +__version__ = "18.6b2" DEFAULT_LINE_LENGTH = 88 DEFAULT_EXCLUDES = ( r"/(\.git|\.hg|\.mypy_cache|\.tox|\.venv|_build|buck-out|build|dist)/" @@ -57,6 +59,7 @@ CACHE_DIR = Path(user_cache_dir("black", version=__version__)) # types FileContent = str Encoding = str +NewLine = str Depth = int NodeType = int LeafID = int @@ -154,7 +157,41 @@ class FileMode(Flag): return mode -@click.command() +def read_pyproject_toml( + ctx: click.Context, param: click.Parameter, value: Union[str, int, bool, None] +) -> Optional[str]: + """Inject Black configuration from "pyproject.toml" into defaults in `ctx`. + + Returns the path to a successfully found and read configuration file, None + otherwise. + """ + assert not isinstance(value, (int, bool)), "Invalid parameter type passed" + if not value: + root = find_project_root(ctx.params.get("src", ())) + path = root / "pyproject.toml" + if path.is_file(): + value = str(path) + else: + return None + + try: + pyproject_toml = toml.load(value) + config = pyproject_toml.get("tool", {}).get("black", {}) + except (toml.TomlDecodeError, OSError) as e: + raise click.BadOptionUsage(f"Error reading configuration file: {e}", ctx) + + if not config: + return None + + if ctx.default_map is None: + ctx.default_map = {} + ctx.default_map.update( # type: ignore # bad types in .pyi + {k.replace("--", "").replace("-", "_"): v for k, v in config.items()} + ) + return value + + +@click.command(context_settings=dict(help_option_names=["-h", "--help"])) @click.option( "-l", "--line-length", @@ -255,6 +292,16 @@ class FileMode(Flag): type=click.Path( exists=True, file_okay=True, dir_okay=True, readable=True, allow_dash=True ), + is_eager=True, +) +@click.option( + "--config", + type=click.Path( + exists=False, file_okay=True, dir_okay=False, readable=True, allow_dash=False + ), + is_eager=True, + callback=read_pyproject_toml, + help="Read configuration from PATH.", ) @click.pass_context def main( @@ -270,26 +317,29 @@ def main( verbose: bool, include: str, exclude: str, - src: List[str], + src: Tuple[str], + config: Optional[str], ) -> None: """The uncompromising code formatter.""" 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() + if config and verbose: + out(f"Using configuration from {config}.", bold=False, fg="blue") try: - include_regex = re.compile(include) + include_regex = re_compile_maybe_verbose(include) except re.error: err(f"Invalid regular expression for include given: {include!r}") ctx.exit(2) try: - exclude_regex = re.compile(exclude) + exclude_regex = re_compile_maybe_verbose(exclude) except re.error: err(f"Invalid regular expression for exclude given: {exclude!r}") ctx.exit(2) + report = Report(check=check, quiet=quiet, verbose=verbose) root = find_project_root(src) + sources: Set[Path] = set() for s in src: p = Path(s) if p.is_dir(): @@ -305,9 +355,8 @@ def main( if verbose or not quiet: out("No paths given. Nothing to do 😴") ctx.exit(0) - return - elif len(sources) == 1: + if len(sources) == 1: reformat_one( src=sources.pop(), line_length=line_length, @@ -334,9 +383,10 @@ def main( ) finally: shutdown(loop) - if verbose or 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) @@ -468,8 +518,9 @@ def format_file_in_place( if src.suffix == ".pyi": mode |= FileMode.PYI + then = datetime.utcfromtimestamp(src.stat().st_mtime) with open(src, "rb") as buf: - newline, encoding, src_contents = prepare_input(buf.read()) + src_contents, encoding, newline = decode_bytes(buf.read()) try: dst_contents = format_file_contents( src_contents, line_length=line_length, fast=fast, mode=mode @@ -481,8 +532,9 @@ def format_file_in_place( 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() @@ -513,7 +565,8 @@ def format_stdin_to_stdout( `line_length`, `fast`, `is_pyi`, and `force_py36` arguments are passed to :func:`format_file_contents`. """ - newline, encoding, src = prepare_input(sys.stdin.buffer.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, mode=mode) @@ -523,26 +576,17 @@ def format_stdin_to_stdout( return False finally: + f = io.TextIOWrapper( + sys.stdout.buffer, encoding=encoding, newline=newline, write_through=True + ) if write_back == WriteBack.YES: - f = io.TextIOWrapper( - sys.stdout.buffer, - encoding=encoding, - newline=newline, - write_through=True, - ) f.write(dst) - f.detach() elif write_back == WriteBack.DIFF: - src_name = " (original)" - dst_name = " (formatted)" - f = io.TextIOWrapper( - sys.stdout.buffer, - encoding=encoding, - newline=newline, - write_through=True, - ) + 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() + f.detach() def format_file_contents( @@ -603,17 +647,21 @@ def format_str( return dst_contents -def prepare_input(src: bytes) -> Tuple[str, str, str]: - """Analyze `src` and return a tuple of (newline, encoding, decoded_contents) +def decode_bytes(src: bytes) -> Tuple[FileContent, Encoding, NewLine]: + """Return a tuple of (decoded_contents, encoding, newline). - Where `newline` is either CRLF or LF, and `decoded_contents` is decoded with - universal newlines (i.e. only LF). + `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) - return newline, encoding, io.TextIOWrapper(srcbuf, encoding).read() + with io.TextIOWrapper(srcbuf, encoding) as tiow: + return tiow.read(), encoding, newline GRAMMARS = [ @@ -626,7 +674,7 @@ 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": + if src_txt[-1:] != "\n": src_txt += "\n" for grammar in GRAMMARS: drv = driver.Driver(grammar, pytree.convert) @@ -771,6 +819,7 @@ UNPACKING_PARENTS = { syms.dictsetmaker, syms.listmaker, syms.testlist_gexp, + syms.testlist_star_expr, } TEST_DESCENDANTS = { syms.test, @@ -1093,6 +1142,13 @@ 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 ( @@ -1174,6 +1230,9 @@ class Line: Provide a non-negative leaf `_index` to speed up the function. """ + if not self.comments: + return + if _index == -1: for _index, _leaf in enumerate(self.leaves): if leaf is _leaf: @@ -1197,18 +1256,18 @@ class Line: def is_complex_subscript(self, leaf: Leaf) -> bool: """Return True iff `leaf` is part of a slice with non-trivial exprs.""" - open_lsqb = ( - leaf if leaf.type == token.LSQB else self.bracket_tracker.get_open_lsqb() - ) + open_lsqb = self.bracket_tracker.get_open_lsqb() if open_lsqb is None: return False subscript_start = open_lsqb.next_sibling - if ( - isinstance(subscript_start, Node) - and subscript_start.type == syms.subscriptlist - ): - subscript_start = child_towards(subscript_start, leaf) + + if isinstance(subscript_start, Node): + if subscript_start.type == syms.listmaker: + return False + + if subscript_start.type == syms.subscriptlist: + subscript_start = child_towards(subscript_start, leaf) return subscript_start is not None and any( n.type in TEST_DESCENDANTS for n in subscript_start.pre_order() ) @@ -1331,44 +1390,8 @@ class EmptyLineTracker: before = 0 if depth else 1 else: before = 1 if depth else 2 - is_decorator = current_line.is_decorator - if is_decorator or current_line.is_def or current_line.is_class: - if not is_decorator: - self.previous_defs.append(depth) - if self.previous_line is None: - # Don't insert empty lines before the first line in the file. - return 0, 0 - - 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 - and before == 0 - ): - return 0, 0 - - if self.is_pyi: - if self.previous_line.depth > current_line.depth: - newlines = 1 - elif current_line.is_class or self.previous_line.is_class: - if current_line.is_stub_class and self.previous_line.is_stub_class: - newlines = 0 - else: - newlines = 1 - else: - newlines = 0 - else: - newlines = 2 - if current_line.depth and newlines: - newlines -= 1 - return newlines, 0 + if current_line.is_decorator or current_line.is_def or current_line.is_class: + return self._maybe_empty_lines_for_class_or_def(current_line, before) if ( self.previous_line @@ -1387,6 +1410,50 @@ class EmptyLineTracker: return before, 0 + def _maybe_empty_lines_for_class_or_def( + self, current_line: Line, before: int + ) -> Tuple[int, int]: + if not current_line.is_decorator: + self.previous_defs.append(current_line.depth) + if self.previous_line is None: + # Don't insert empty lines before the first line in the file. + return 0, 0 + + 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 + and before == 0 + ): + return 0, 0 + + if self.is_pyi: + if self.previous_line.depth > current_line.depth: + newlines = 1 + elif current_line.is_class or self.previous_line.is_class: + if current_line.is_stub_class and self.previous_line.is_stub_class: + # No blank line between classes with an emty body + newlines = 0 + else: + newlines = 1 + elif current_line.is_def and not self.previous_line.is_def: + # Blank line between a block of functions and a block of non-functions + newlines = 1 + else: + newlines = 0 + else: + newlines = 2 + if current_line.depth and newlines: + newlines -= 1 + return newlines, 0 + @dataclass class LineGenerator(Visitor[Line]): @@ -1826,7 +1893,7 @@ 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: @@ -1978,6 +2045,10 @@ def is_split_before_delimiter(leaf: Leaf, previous: Leaf = None) -> int: return 0 +FMT_OFF = {"# fmt: off", "# fmt:off", "# yapf: disable"} +FMT_ON = {"# fmt: on", "# fmt:on", "# yapf: enable"} + + def generate_comments(leaf: LN) -> Iterator[Leaf]: """Clean the prefix of the `leaf` and generate comments from it, if any. @@ -1997,16 +2068,37 @@ def generate_comments(leaf: LN) -> Iterator[Leaf]: Inline comments are emitted as regular token.COMMENT leaves. Standalone are emitted with a fake STANDALONE_COMMENT token identifier. """ - p = leaf.prefix - if not p: - return + for pc in list_comments(leaf.prefix, is_endmarker=leaf.type == token.ENDMARKER): + yield Leaf(pc.type, pc.value, prefix="\n" * pc.newlines) + if pc.value in FMT_ON: + raise FormatOn(pc.consumed) + + if pc.value in FMT_OFF: + if pc.type == STANDALONE_COMMENT: + raise FormatOff(pc.consumed) + + prev = preceding_leaf(leaf) + if not prev or prev.type in WHITESPACE: # standalone comment in disguise + raise FormatOff(pc.consumed) + + +@dataclass +class ProtoComment: + type: int # token.COMMENT or STANDALONE_COMMENT + value: str # content of the comment + newlines: int # how many newlines before the comment + consumed: int # how many characters of the original leaf's prefix did we consume - if "#" not in p: - return + +@lru_cache(maxsize=4096) +def list_comments(prefix: str, is_endmarker: bool) -> List[ProtoComment]: + result: List[ProtoComment] = [] + if not prefix or "#" not in prefix: + return result consumed = 0 nlines = 0 - for index, line in enumerate(p.split("\n")): + for index, line in enumerate(prefix.split("\n")): consumed += len(line) + 1 # adding the length of the split '\n' line = line.lstrip() if not line: @@ -2014,25 +2106,18 @@ def generate_comments(leaf: LN) -> Iterator[Leaf]: if not line.startswith("#"): continue - if index == 0 and leaf.type != token.ENDMARKER: + if index == 0 and not is_endmarker: comment_type = token.COMMENT # simple trailing comment else: comment_type = STANDALONE_COMMENT comment = make_comment(line) - yield Leaf(comment_type, comment, prefix="\n" * nlines) - - if comment in {"# fmt: on", "# yapf: enable"}: - raise FormatOn(consumed) - - if comment in {"# fmt: off", "# yapf: disable"}: - if comment_type == STANDALONE_COMMENT: - raise FormatOff(consumed) - - prev = preceding_leaf(leaf) - if not prev or prev.type in WHITESPACE: # standalone comment in disguise - raise FormatOff(consumed) - + result.append( + ProtoComment( + type=comment_type, value=comment, newlines=nlines, consumed=consumed + ) + ) nlines = 0 + return result def make_comment(content: str) -> str: @@ -2212,32 +2297,50 @@ 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 @@ -2452,8 +2555,8 @@ def normalize_string_quotes(leaf: Leaf) -> None: prefix = leaf.value[:first_quote_pos] unescaped_new_quote = re.compile(rf"(([^\\]|^)(\\\\)*){new_quote}") - escaped_new_quote = re.compile(rf"([^\\]|^)\\(\\\\)*{new_quote}") - escaped_orig_quote = re.compile(rf"([^\\]|^)\\(\\\\)*{orig_quote}") + escaped_new_quote = re.compile(rf"([^\\]|^)\\((?:\\\\)*){new_quote}") + escaped_orig_quote = re.compile(rf"([^\\]|^)\\((?:\\\\)*){orig_quote}") body = leaf.value[first_quote_pos + len(orig_quote) : -len(orig_quote)] if "r" in prefix.casefold(): if unescaped_new_quote.search(body): @@ -2464,15 +2567,21 @@ def normalize_string_quotes(leaf: Leaf) -> None: # Do not introduce or remove backslashes in raw strings new_body = body else: - # remove unnecessary quotes + # remove unnecessary escapes new_body = sub_twice(escaped_new_quote, rf"\1\2{new_quote}", body) if body != new_body: - # Consider the string without unnecessary quotes as the original + # Consider the string without unnecessary escapes as the original body = new_body leaf.value = f"{prefix}{orig_quote}{body}{orig_quote}" new_body = sub_twice(escaped_orig_quote, rf"\1\2{orig_quote}", new_body) new_body = sub_twice(unescaped_new_quote, rf"\1\\{new_quote}", new_body) - if new_quote == '"""' and new_body[-1] == '"': + if "f" in prefix.casefold(): + matches = re.findall(r"[^{]\{(.*?)\}[^}]", new_body) + for m in matches: + if "\\" in str(m): + # Do not introduce backslashes in interpolated expressions + return + if new_quote == '"""' and new_body[-1:] == '"': # edge case: new_body = new_body[:-1] + '\\"' orig_escape_count = body.count("\\") @@ -2495,10 +2604,10 @@ def normalize_invisible_parens(node: Node, parens_after: Set[str]) -> None: Standardizes on visible parentheses for single-element tuples, and keeps existing visible parentheses for other tuples and generator expressions. """ - try: - list(generate_comments(node)) - except FormatOff: - return # This `node` has a prefix with `# fmt: off`, don't mess with parens. + for pc in list_comments(node.prefix, is_endmarker=False): + if pc.value in FMT_OFF: + # This `node` has a prefix with `# fmt: off`, don't mess with parens. + return check_lpar = False for index, child in enumerate(list(node.children)): @@ -2535,7 +2644,7 @@ 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) @@ -2858,16 +2967,29 @@ def gen_python_files_in_dir( """Generate all files under `path` whose paths are not excluded by the `exclude` regex, but are included by the `include` regex. + Symbolic links pointing outside of the root directory are ignored. + `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() + try: + normalized_path = "/" + child.resolve().relative_to(root).as_posix() + except ValueError: + if child.is_symlink(): + report.path_ignored( + child, + "is a symbolic link that points outside of the root directory", + ) + continue + + raise + if child.is_dir(): 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}") + report.path_ignored(child, f"matches the --exclude regular expression") continue if child.is_dir(): @@ -2879,7 +3001,8 @@ def gen_python_files_in_dir( yield child -def find_project_root(srcs: List[str]) -> Path: +@lru_cache() +def find_project_root(srcs: Iterable[str]) -> Path: """Return a directory containing .git, .hg, or pyproject.toml. That directory can be one of the directories passed in `srcs` or their @@ -3137,6 +3260,16 @@ def sub_twice(regex: Pattern[str], replacement: str, original: str) -> str: return regex.sub(replacement, regex.sub(replacement, original)) +def re_compile_maybe_verbose(regex: str) -> Pattern[str]: + """Compile a regular expression string in `regex`. + + If it contains newlines, use verbose mode. + """ + if "\n" in regex: + regex = "(?x)" + regex + return re.compile(regex) + + def enumerate_reversed(sequence: Sequence[T]) -> Iterator[Tuple[Index, T]]: """Like `reversed(enumerate(sequence))` if that were possible.""" index = len(sequence) - 1 @@ -3182,6 +3315,42 @@ 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? @@ -3272,12 +3441,7 @@ def can_omit_invisible_parens(line: Line, line_length: int) -> bool: 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" - ) + return CACHE_DIR / f"cache.{line_length}.{mode.value}.pickle" def read_cache(line_length: int, mode: FileMode) -> Cache: