Fix an example for 'Improved parentheses management' in the (future of the) Black...

[etc/vim.git] / src / black / __init__.py

diff --git a/src/black/__init__.py b/src/black/__init__.py
index d9fba41ebd34136560e09ae296e1a4a425dec8f5..4ebf28821c39ca339b05f372de2695246f6fcc99 100644 (file)
--- a/src/black/__init__.py
+++ b/src/black/__init__.py
@@ -30,6 +30,7 @@ from typing import (
 import click
 from click.core import ParameterSource
 from mypy_extensions import mypyc_attr
 import click
 from click.core import ParameterSource
 from mypy_extensions import mypyc_attr

+from pathspec import PathSpec

 from pathspec.patterns.gitwildmatch import GitWildMatchPatternError
 
 from _black_version import version as __version__
 from pathspec.patterns.gitwildmatch import GitWildMatchPatternError
 
 from _black_version import version as __version__


@@ -218,8 +219,9 @@ def validate_regex(
     callback=target_version_option_callback,
     multiple=True,
     help=(
     callback=target_version_option_callback,
     multiple=True,
     help=(

-        "Python versions that should be supported by Black's output. [default: per-file"
-        " auto-detection]"
+        "Python versions that should be supported by Black's output. By default, Black"
+        " will try to infer this from the project metadata in pyproject.toml. If this"
+        " does not yield conclusive results, Black will use per-file auto-detection."

     ),
 )
 @click.option(
     ),
 )
 @click.option(


@@ -243,7 +245,7 @@ def validate_regex(
     multiple=True,
     help=(
         "When processing Jupyter Notebooks, add the given magic to the list"
     multiple=True,
     help=(
         "When processing Jupyter Notebooks, add the given magic to the list"

-        f" of known python-magics ({', '.join(PYTHON_CELL_MAGICS)})."
+        f" of known python-magics ({', '.join(sorted(PYTHON_CELL_MAGICS))})."

         " Useful for formatting cells with custom python magics."
     ),
     default=[],
         " Useful for formatting cells with custom python magics."
     ),
     default=[],


@@ -477,16 +479,20 @@ def main(  # noqa: C901
             )
 
             normalized = [
             )
 
             normalized = [

-                (source, source)
-                if source == "-"
-                else (normalize_path_maybe_ignore(Path(source), root), source)
+                (
+                    (source, source)
+                    if source == "-"
+                    else (normalize_path_maybe_ignore(Path(source), root), source)
+                )

                 for source in src
             ]
             srcs_string = ", ".join(
                 [
                 for source in src
             ]
             srcs_string = ", ".join(
                 [

-                    f'"{_norm}"'
-                    if _norm
-                    else f'\033[31m"{source} (skipping - invalid)"\033[34m'
+                    (
+                        f'"{_norm}"'
+                        if _norm
+                        else f'\033[31m"{source} (skipping - invalid)"\033[34m'
+                    )

                     for _norm, source in normalized
                 ]
             )
                     for _norm, source in normalized
                 ]
             )


@@ -497,8 +503,10 @@ def main(  # noqa: C901
             user_level_config = str(find_user_pyproject_toml())
             if config == user_level_config:
                 out(
             user_level_config = str(find_user_pyproject_toml())
             if config == user_level_config:
                 out(

-                    "Using configuration from user-level config at "
-                    f"'{user_level_config}'.",
+                    (
+                        "Using configuration from user-level config at "
+                        f"'{user_level_config}'."
+                    ),

                     fg="blue",
                 )
             elif config_source in (
                     fg="blue",
                 )
             elif config_source in (


@@ -508,6 +516,9 @@ def main(  # noqa: C901
                 out("Using configuration from project root.", fg="blue")
             else:
                 out(f"Using configuration in '{config}'.", fg="blue")
                 out("Using configuration from project root.", fg="blue")
             else:
                 out(f"Using configuration in '{config}'.", fg="blue")

+            if ctx.default_map:
+                for param, value in ctx.default_map.items():
+                    out(f"{param}: {value}")

 
     error_msg = "Oh no! 💥 💔 💥"
     if (
 
     error_msg = "Oh no! 💥 💔 💥"
     if (


@@ -625,6 +636,11 @@ def get_sources(
     sources: Set[Path] = set()
     root = ctx.obj["root"]
 
     sources: Set[Path] = set()
     root = ctx.obj["root"]
 

+    using_default_exclude = exclude is None
+    exclude = re_compile_maybe_verbose(DEFAULT_EXCLUDES) if exclude is None else exclude
+    gitignore: Optional[Dict[Path, PathSpec]] = None
+    root_gitignore = get_gitignore(root)
+

     for s in src:
         if s == "-" and stdin_filename:
             p = Path(stdin_filename)
     for s in src:
         if s == "-" and stdin_filename:
             p = Path(stdin_filename)


@@ -658,16 +674,12 @@ def get_sources(
 
             sources.add(p)
         elif p.is_dir():
 
             sources.add(p)
         elif p.is_dir():

-            if exclude is None:
-                exclude = re_compile_maybe_verbose(DEFAULT_EXCLUDES)
-                gitignore = get_gitignore(root)
-                p_gitignore = get_gitignore(p)
-                # No need to use p's gitignore if it is identical to root's gitignore
-                # (i.e. root and p point to the same directory).
-                if gitignore != p_gitignore:
-                    gitignore += p_gitignore
-            else:
-                gitignore = None
+            p = root / normalize_path_maybe_ignore(p, ctx.obj["root"], report)
+            if using_default_exclude:
+                gitignore = {
+                    root: root_gitignore,
+                    p: get_gitignore(p),
+                }

             sources.update(
                 gen_python_files(
                     p.iterdir(),
             sources.update(
                 gen_python_files(
                     p.iterdir(),


@@ -914,9 +926,6 @@ def format_file_contents(src_contents: str, *, fast: bool, mode: Mode) -> FileCo
     valid by calling :func:`assert_equivalent` and :func:`assert_stable` on it.
     `mode` is passed to :func:`format_str`.
     """
     valid by calling :func:`assert_equivalent` and :func:`assert_stable` on it.
     `mode` is passed to :func:`format_str`.
     """

-    if not src_contents.strip():
-        raise NothingChanged
-

     if mode.is_ipynb:
         dst_contents = format_ipynb_string(src_contents, fast=fast, mode=mode)
     else:
     if mode.is_ipynb:
         dst_contents = format_ipynb_string(src_contents, fast=fast, mode=mode)
     else:


@@ -1011,6 +1020,9 @@ def format_ipynb_string(src_contents: str, *, fast: bool, mode: Mode) -> FileCon
     Operate cell-by-cell, only on code cells, only for Python notebooks.
     If the ``.ipynb`` originally had a trailing newline, it'll be preserved.
     """
     Operate cell-by-cell, only on code cells, only for Python notebooks.
     If the ``.ipynb`` originally had a trailing newline, it'll be preserved.
     """

+    if not src_contents:
+        raise NothingChanged
+

     trailing_newline = src_contents[-1] == "\n"
     modified = False
     nb = json.loads(src_contents)
     trailing_newline = src_contents[-1] == "\n"
     modified = False
     nb = json.loads(src_contents)


@@ -1082,8 +1094,13 @@ def _format_str_once(src_contents: str, *, mode: Mode) -> str:
         future_imports = get_future_imports(src_node)
         versions = detect_target_versions(src_node, future_imports=future_imports)
 
         future_imports = get_future_imports(src_node)
         versions = detect_target_versions(src_node, future_imports=future_imports)
 

-    normalize_fmt_off(src_node, preview=mode.preview)
-    lines = LineGenerator(mode=mode)
+    context_manager_features = {
+        feature
+        for feature in {Feature.PARENTHESIZED_CONTEXT_MANAGERS}
+        if supports_feature(versions, feature)
+    }
+    normalize_fmt_off(src_node)
+    lines = LineGenerator(mode=mode, features=context_manager_features)

     elt = EmptyLineTracker(mode=mode)
     split_line_features = {
         feature
     elt = EmptyLineTracker(mode=mode)
     split_line_features = {
         feature


@@ -1103,6 +1120,13 @@ def _format_str_once(src_contents: str, *, mode: Mode) -> str:
     dst_contents = []
     for block in dst_blocks:
         dst_contents.extend(block.all_lines())
     dst_contents = []
     for block in dst_blocks:
         dst_contents.extend(block.all_lines())

+    if not dst_contents:
+        # Use decode_bytes to retrieve the correct source newline (CRLF or LF),
+        # and check if normalized_content has more than one line
+        normalized_content, _, newline = decode_bytes(src_contents.encode("utf-8"))
+        if "\n" in normalized_content:
+            return newline
+        return ""

     return "".join(dst_contents)
 
 
     return "".join(dst_contents)
 
 


@@ -1138,6 +1162,10 @@ def get_features_used(  # noqa: C901
     - relaxed decorator syntax;
     - usage of __future__ flags (annotations);
     - print / exec statements;
     - relaxed decorator syntax;
     - usage of __future__ flags (annotations);
     - print / exec statements;

+    - parenthesized context managers;
+    - match statements;
+    - except* clause;
+    - variadic generics;

     """
     features: Set[Feature] = set()
     if future_imports:
     """
     features: Set[Feature] = set()
     if future_imports:


@@ -1213,6 +1241,23 @@ def get_features_used(  # noqa: C901
         ):
             features.add(Feature.ANN_ASSIGN_EXTENDED_RHS)
 
         ):
             features.add(Feature.ANN_ASSIGN_EXTENDED_RHS)
 

+        elif (
+            n.type == syms.with_stmt
+            and len(n.children) > 2
+            and n.children[1].type == syms.atom
+        ):
+            atom_children = n.children[1].children
+            if (
+                len(atom_children) == 3
+                and atom_children[0].type == token.LPAR
+                and atom_children[1].type == syms.testlist_gexp
+                and atom_children[2].type == token.RPAR
+            ):
+                features.add(Feature.PARENTHESIZED_CONTEXT_MANAGERS)
+
+        elif n.type == syms.match_stmt:
+            features.add(Feature.PATTERN_MATCHING)
+

         elif (
             n.type == syms.except_clause
             and len(n.children) >= 2
         elif (
             n.type == syms.except_clause
             and len(n.children) >= 2