Add option to skip the first line of source code (#3299)

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

diff --git a/src/blackd/__init__.py b/src/blackd/__init__.py
index 3e2a7e7c30f3eb3ed18d51bd18b4322069b588c3..ba4750b829836d803bea2e285c785b9e4094b9cb 100644 (file)
--- a/src/blackd/__init__.py
+++ b/src/blackd/__init__.py
@@ -1,6 +1,5 @@
 import asyncio
 import logging
 import asyncio
 import logging

-import sys

 from concurrent.futures import Executor, ProcessPoolExecutor
 from datetime import datetime
 from functools import partial
 from concurrent.futures import Executor, ProcessPoolExecutor
 from datetime import datetime
 from functools import partial


@@ -9,21 +8,20 @@ from typing import Set, Tuple
 
 try:
     from aiohttp import web
 
 try:
     from aiohttp import web

-    import aiohttp_cors
+
+    from .middlewares import cors

 except ImportError as ie:
 except ImportError as ie:

-    print(
+    raise ImportError(

         f"aiohttp dependency is not installed: {ie}. "
         + "Please re-install black with the '[d]' extra install "
         f"aiohttp dependency is not installed: {ie}. "
         + "Please re-install black with the '[d]' extra install "

-        + "to obtain aiohttp_cors: `pip install black[d]`",
-        file=sys.stderr,
-    )
-    sys.exit(-1)
+        + "to obtain aiohttp_cors: `pip install black[d]`"
+    ) from None

 
 

-import black
-from black.concurrency import maybe_install_uvloop

 import click
 
 import click
 

+import black

 from _black_version import version as __version__
 from _black_version import version as __version__

+from black.concurrency import maybe_install_uvloop

 
 # This is used internally by tests to shut down the server prematurely
 _stop_signal = asyncio.Event()
 
 # This is used internally by tests to shut down the server prematurely
 _stop_signal = asyncio.Event()


@@ -32,8 +30,10 @@ _stop_signal = asyncio.Event()
 PROTOCOL_VERSION_HEADER = "X-Protocol-Version"
 LINE_LENGTH_HEADER = "X-Line-Length"
 PYTHON_VARIANT_HEADER = "X-Python-Variant"
 PROTOCOL_VERSION_HEADER = "X-Protocol-Version"
 LINE_LENGTH_HEADER = "X-Line-Length"
 PYTHON_VARIANT_HEADER = "X-Python-Variant"

+SKIP_SOURCE_FIRST_LINE = "X-Skip-Source-First-Line"

 SKIP_STRING_NORMALIZATION_HEADER = "X-Skip-String-Normalization"
 SKIP_MAGIC_TRAILING_COMMA = "X-Skip-Magic-Trailing-Comma"
 SKIP_STRING_NORMALIZATION_HEADER = "X-Skip-String-Normalization"
 SKIP_MAGIC_TRAILING_COMMA = "X-Skip-Magic-Trailing-Comma"

+PREVIEW = "X-Preview"

 FAST_OR_SAFE_HEADER = "X-Fast-Or-Safe"
 DIFF_HEADER = "X-Diff"
 
 FAST_OR_SAFE_HEADER = "X-Fast-Or-Safe"
 DIFF_HEADER = "X-Diff"
 


@@ -41,8 +41,10 @@ BLACK_HEADERS = [
     PROTOCOL_VERSION_HEADER,
     LINE_LENGTH_HEADER,
     PYTHON_VARIANT_HEADER,
     PROTOCOL_VERSION_HEADER,
     LINE_LENGTH_HEADER,
     PYTHON_VARIANT_HEADER,

+    SKIP_SOURCE_FIRST_LINE,

     SKIP_STRING_NORMALIZATION_HEADER,
     SKIP_MAGIC_TRAILING_COMMA,
     SKIP_STRING_NORMALIZATION_HEADER,
     SKIP_MAGIC_TRAILING_COMMA,

+    PREVIEW,

     FAST_OR_SAFE_HEADER,
     DIFF_HEADER,
 ]
     FAST_OR_SAFE_HEADER,
     DIFF_HEADER,
 ]


@@ -70,20 +72,11 @@ def main(bind_host: str, bind_port: int) -> None:
 
 
 def make_app() -> web.Application:
 
 
 def make_app() -> web.Application:

-    app = web.Application()
-    executor = ProcessPoolExecutor()
-
-    cors = aiohttp_cors.setup(app)
-    resource = cors.add(app.router.add_resource("/"))
-    cors.add(
-        resource.add_route("POST", partial(handle, executor=executor)),
-        {
-            "*": aiohttp_cors.ResourceOptions(
-                allow_headers=(*BLACK_HEADERS, "Content-Type"), expose_headers="*"
-            )
-        },
+    app = web.Application(
+        middlewares=[cors(allow_headers=(*BLACK_HEADERS, "Content-Type"))]

     )
     )

-
+    executor = ProcessPoolExecutor()
+    app.add_routes([web.post("/", partial(handle, executor=executor))])

     return app
 
 
     return app
 
 


@@ -120,6 +113,10 @@ async def handle(request: web.Request, executor: Executor) -> web.Response:
         skip_magic_trailing_comma = bool(
             request.headers.get(SKIP_MAGIC_TRAILING_COMMA, False)
         )
         skip_magic_trailing_comma = bool(
             request.headers.get(SKIP_MAGIC_TRAILING_COMMA, False)
         )

+        skip_source_first_line = bool(
+            request.headers.get(SKIP_SOURCE_FIRST_LINE, False)
+        )
+        preview = bool(request.headers.get(PREVIEW, False))

         fast = False
         if request.headers.get(FAST_OR_SAFE_HEADER, "safe") == "fast":
             fast = True
         fast = False
         if request.headers.get(FAST_OR_SAFE_HEADER, "safe") == "fast":
             fast = True


@@ -127,19 +124,38 @@ async def handle(request: web.Request, executor: Executor) -> web.Response:
             target_versions=versions,
             is_pyi=pyi,
             line_length=line_length,
             target_versions=versions,
             is_pyi=pyi,
             line_length=line_length,

+            skip_source_first_line=skip_source_first_line,

             string_normalization=not skip_string_normalization,
             magic_trailing_comma=not skip_magic_trailing_comma,
             string_normalization=not skip_string_normalization,
             magic_trailing_comma=not skip_magic_trailing_comma,

+            preview=preview,

         )
         req_bytes = await request.content.read()
         charset = request.charset if request.charset is not None else "utf8"
         req_str = req_bytes.decode(charset)
         then = datetime.utcnow()
 
         )
         req_bytes = await request.content.read()
         charset = request.charset if request.charset is not None else "utf8"
         req_str = req_bytes.decode(charset)
         then = datetime.utcnow()
 

+        header = ""
+        if skip_source_first_line:
+            first_newline_position: int = req_str.find("\n") + 1
+            header = req_str[:first_newline_position]
+            req_str = req_str[first_newline_position:]
+

         loop = asyncio.get_event_loop()
         formatted_str = await loop.run_in_executor(
             executor, partial(black.format_file_contents, req_str, fast=fast, mode=mode)
         )
 
         loop = asyncio.get_event_loop()
         formatted_str = await loop.run_in_executor(
             executor, partial(black.format_file_contents, req_str, fast=fast, mode=mode)
         )
 

+        # Preserve CRLF line endings
+        if req_str[req_str.find("\n") - 1] == "\r":
+            formatted_str = formatted_str.replace("\n", "\r\n")
+            # If, after swapping line endings, nothing changed, then say so
+            if formatted_str == req_str:
+                raise black.NothingChanged
+
+        # Put the source first line back
+        req_str = header + req_str
+        formatted_str = header + formatted_str
+

         # Only output the diff in the HTTP response
         only_diff = bool(request.headers.get(DIFF_HEADER, False))
         if only_diff:
         # Only output the diff in the HTTP response
         only_diff = bool(request.headers.get(DIFF_HEADER, False))
         if only_diff:


@@ -186,10 +202,8 @@ def parse_python_variant_header(value: str) -> Tuple[bool, Set[black.TargetVersi
                     raise InvalidVariantHeader("major version must be 2 or 3")
                 if len(rest) > 0:
                     minor = int(rest[0])
                     raise InvalidVariantHeader("major version must be 2 or 3")
                 if len(rest) > 0:
                     minor = int(rest[0])

-                    if major == 2 and minor != 7:
-                        raise InvalidVariantHeader(
-                            "minor version must be 7 for Python 2"
-                        )
+                    if major == 2:
+                        raise InvalidVariantHeader("Python 2 is not supported")

                 else:
                     # Default to lowest supported minor version.
                     minor = 7 if major == 2 else 3
                 else:
                     # Default to lowest supported minor version.
                     minor = 7 if major == 2 else 3


@@ -198,7 +212,7 @@ def parse_python_variant_header(value: str) -> Tuple[bool, Set[black.TargetVersi
                     raise InvalidVariantHeader(f"3.{minor} is not supported")
                 versions.add(black.TargetVersion[version_str])
             except (KeyError, ValueError):
                     raise InvalidVariantHeader(f"3.{minor} is not supported")
                 versions.add(black.TargetVersion[version_str])
             except (KeyError, ValueError):

-                raise InvalidVariantHeader("expected e.g. '3.7', 'py3.5'")
+                raise InvalidVariantHeader("expected e.g. '3.7', 'py3.5'") from None

         return False, versions
 
 
         return False, versions