Fix long trivial assignments being wrapped in unnecessary parentheses

[etc/vim.git] / black.py

diff --git a/black.py b/black.py
index c8c381c2d30ff3fba658299c49de961542490d68..35af598e59032c62397bff766d06b006df41174c 100644 (file)
--- a/black.py
+++ b/black.py
@@ -1,7 +1,7 @@
 import asyncio
 import asyncio

-import pickle

 from asyncio.base_events import BaseEventLoop
 from concurrent.futures import Executor, ProcessPoolExecutor
 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
 import io
 from enum import Enum, Flag
 from functools import partial, wraps
 import io


@@ -10,10 +10,11 @@ import logging
 from multiprocessing import Manager
 import os
 from pathlib import Path
 from multiprocessing import Manager
 import os
 from pathlib import Path

+import pickle

 import re
 import re

-import tokenize

 import signal
 import sys
 import signal
 import sys

+import tokenize

 from typing import (
     Any,
     Callable,
 from typing import (
     Any,
     Callable,


@@ -57,6 +58,7 @@ CACHE_DIR = Path(user_cache_dir("black", version=__version__))
 # types
 FileContent = str
 Encoding = str
 # types
 FileContent = str
 Encoding = str

+NewLine = str

 Depth = int
 NodeType = int
 LeafID = int
 Depth = int
 NodeType = int
 LeafID = int


@@ -278,7 +280,7 @@ def main(
         py36=py36, pyi=pyi, skip_string_normalization=skip_string_normalization
     )
     report = Report(check=check, quiet=quiet, verbose=verbose)
         py36=py36, pyi=pyi, skip_string_normalization=skip_string_normalization
     )
     report = Report(check=check, quiet=quiet, verbose=verbose)

-    sources: List[Path] = []
+    sources: Set[Path] = set()

     try:
         include_regex = re.compile(include)
     except re.error:
     try:
         include_regex = re.compile(include)
     except re.error:


@@ -293,12 +295,12 @@ def main(
     for s in src:
         p = Path(s)
         if p.is_dir():
     for s in src:
         p = Path(s)
         if p.is_dir():

-            sources.extend(
+            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
                 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)
+            sources.add(p)

         else:
             err(f"invalid path: {s}")
     if len(sources) == 0:
         else:
             err(f"invalid path: {s}")
     if len(sources) == 0:


@@ -309,7 +311,7 @@ def main(
 
     elif len(sources) == 1:
         reformat_one(
 
     elif len(sources) == 1:
         reformat_one(

-            src=sources[0],
+            src=sources.pop(),

             line_length=line_length,
             fast=fast,
             write_back=write_back,
             line_length=line_length,
             fast=fast,
             write_back=write_back,


@@ -334,9 +336,9 @@ def main(
             )
         finally:
             shutdown(loop)
             )
         finally:
             shutdown(loop)

-        if verbose or not quiet:
-            out("All done! ✨ 🍰 ✨")
-            click.echo(str(report))
+    if verbose or not quiet:
+        out("All done! ✨ 🍰 ✨")
+        click.echo(str(report))

     ctx.exit(report.return_code)
 
 
     ctx.exit(report.return_code)
 
 


@@ -384,7 +386,7 @@ def reformat_one(
 
 
 async def schedule_formatting(
 
 
 async def schedule_formatting(

-    sources: List[Path],
+    sources: Set[Path],

     line_length: int,
     fast: bool,
     write_back: WriteBack,
     line_length: int,
     fast: bool,
     write_back: WriteBack,


@@ -404,7 +406,7 @@ async def schedule_formatting(
     if write_back != WriteBack.DIFF:
         cache = read_cache(line_length, mode)
         sources, cached = filter_cached(cache, sources)
     if write_back != WriteBack.DIFF:
         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 = []
             report.done(src, Changed.CACHED)
     cancelled = []
     formatted = []


@@ -468,8 +470,9 @@ def format_file_in_place(
     if src.suffix == ".pyi":
         mode |= FileMode.PYI
 
     if src.suffix == ".pyi":
         mode |= FileMode.PYI
 

+    then = datetime.utcfromtimestamp(src.stat().st_mtime)

     with open(src, "rb") as buf:
     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
     try:
         dst_contents = format_file_contents(
             src_contents, line_length=line_length, fast=fast, mode=mode


@@ -481,8 +484,9 @@ 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:
         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()
         diff_contents = diff(src_contents, dst_contents, src_name, dst_name)
         if lock:
             lock.acquire()


@@ -513,7 +517,8 @@ def format_stdin_to_stdout(
     `line_length`, `fast`, `is_pyi`, and `force_py36` arguments are passed to
     :func:`format_file_contents`.
     """
     `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)
     dst = src
     try:
         dst = format_file_contents(src, line_length=line_length, fast=fast, mode=mode)


@@ -523,26 +528,17 @@ def format_stdin_to_stdout(
         return False
 
     finally:
         return False
 
     finally:

+        f = io.TextIOWrapper(
+            sys.stdout.buffer, encoding=encoding, newline=newline, write_through=True
+        )

         if write_back == WriteBack.YES:
         if write_back == WriteBack.YES:

-            f = io.TextIOWrapper(
-                sys.stdout.buffer,
-                encoding=encoding,
-                newline=newline,
-                write_through=True,
-            )

             f.write(dst)
             f.write(dst)

-            f.detach()

         elif write_back == WriteBack.DIFF:
         elif write_back == WriteBack.DIFF:

-            src_name = "<stdin>  (original)"
-            dst_name = "<stdin>  (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.write(diff(src, dst, src_name, dst_name))

-            f.detach()
+        f.detach()

 
 
 def format_file_contents(
 
 
 def format_file_contents(


@@ -603,17 +599,21 @@ def format_str(
     return dst_contents
 
 
     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)
     """
     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)
     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 = [
 
 
 GRAMMARS = [


@@ -626,7 +626,7 @@ GRAMMARS = [
 def lib2to3_parse(src_txt: str) -> Node:
     """Given a string with source, return the lib2to3 Node."""
     grammar = pygram.python_grammar_no_print_statement
 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)
         src_txt += "\n"
     for grammar in GRAMMARS:
         drv = driver.Driver(grammar, pytree.convert)


@@ -771,6 +771,7 @@ UNPACKING_PARENTS = {
     syms.dictsetmaker,
     syms.listmaker,
     syms.testlist_gexp,
     syms.dictsetmaker,
     syms.listmaker,
     syms.testlist_gexp,

+    syms.testlist_star_expr,

 }
 TEST_DESCENDANTS = {
     syms.test,
 }
 TEST_DESCENDANTS = {
     syms.test,


@@ -2212,11 +2213,14 @@ def right_hand_split(
             result.append(leaf, preformatted=True)
             for comment_after in line.comments_after(leaf):
                 result.append(comment_after, preformatted=True)
             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
     assert opening_bracket and closing_bracket

+    body.should_explode = should_explode(body, opening_bracket)
+    bracket_split_succeeded_or_raise(head, body, tail)

     if (
     if (

+        # the body shouldn't be exploded
+        not body.should_explode

         # the opening bracket is an optional paren
         # 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 opening_bracket.value
         # the closing bracket is an optional paren
         and closing_bracket.type == token.RPAR


@@ -2233,11 +2237,15 @@ def right_hand_split(
                 yield from right_hand_split(line, line_length, py36=py36, omit=omit)
                 return
             except CannotSplit:
                 yield from right_hand_split(line, line_length, py36=py36, omit=omit)
                 return
             except CannotSplit:

-                pass
+                if len(body.leaves) == 1 and not is_line_short_enough(
+                    body, line_length=line_length
+                ):
+                    raise CannotSplit(
+                        "Splitting failed, body is still too long and can't be split."
+                    )

 
     ensure_visible(opening_bracket)
     ensure_visible(closing_bracket)
 
     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
     for result in (head, body, tail):
         if result:
             yield result


@@ -3304,26 +3312,24 @@ def get_cache_info(path: Path) -> CacheInfo:
     return stat.st_mtime, stat.st_size
 
 
     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):
     for src in sources:
         src = src.resolve()
         if cache.get(src) != get_cache_info(src):

-            todo.append(src)
+            todo.add(src)

         else:
         else:

-            done.append(src)
+            done.add(src)

     return todo, done
 
 
 def write_cache(
     return todo, done
 
 
 def write_cache(

-    cache: Cache, sources: List[Path], line_length: int, mode: FileMode
+    cache: Cache, sources: Iterable[Path], line_length: int, mode: FileMode

 ) -> None:
     """Update the cache file."""
     cache_file = get_cache_file(line_length, mode)
 ) -> None:
     """Update the cache file."""
     cache_file = get_cache_file(line_length, mode)