Avoid src being marked as optional in help (#2356)

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

diff --git a/src/black/__init__.py b/src/black/__init__.py
index d95e9b13bb92b80cdab097c2ec840d4fbf13d52a..51384fb08da5edadc3d783425cbfb448f7306afe 100644 (file)
--- a/src/black/__init__.py
+++ b/src/black/__init__.py
@@ -241,6 +241,14 @@ def validate_regex(
     is_flag=True,
     help="If --fast given, skip temporary sanity checks. [default: --safe]",
 )
+@click.option(
+    "--required-version",
+    type=str,
+    help=(
+        "Require a specific version of Black to be running (useful for unifying results"
+        " across many environments e.g. with a pyproject.toml file)."
+    ),
+)
 @click.option(
     "--include",
     type=str,
@@ -320,6 +328,7 @@ def validate_regex(
         exists=True, file_okay=True, dir_okay=True, readable=True, allow_dash=True
     ),
     is_eager=True,
+    metavar="SRC ...",
 )
 @click.option(
     "--config",
@@ -351,6 +360,7 @@ def main(
     experimental_string_processing: bool,
     quiet: bool,
     verbose: bool,
+    required_version: str,
     include: Pattern,
     exclude: Optional[Pattern],
     extend_exclude: Optional[Pattern],
@@ -360,6 +370,17 @@ def main(
     config: Optional[str],
 ) -> None:
     """The uncompromising code formatter."""
+    if config and verbose:
+        out(f"Using configuration from {config}.", bold=False, fg="blue")
+
+    error_msg = "Oh no! 💥 💔 💥"
+    if required_version and required_version != __version__:
+        err(
+            f"{error_msg} The required version `{required_version}` does not match"
+            f" the running version `{__version__}`!"
+        )
+        ctx.exit(1)
+
     write_back = WriteBack.from_configuration(check=check, diff=diff, color=color)
     if target_version:
         versions = set(target_version)
@@ -374,8 +395,6 @@ def main(
         magic_trailing_comma=not skip_magic_trailing_comma,
         experimental_string_processing=experimental_string_processing,
     )
-    if config and verbose:
-        out(f"Using configuration from {config}.", bold=False, fg="blue")
 
     if code is not None:
         # Run in quiet mode by default with -c; the extra output isn't useful.
@@ -428,9 +447,9 @@ def main(
             )
 
     if verbose or not quiet:
-        out("Oh no! 💥 💔 💥" if report.return_code else "All done! ✨ 🍰 ✨")
+        out(error_msg if report.return_code else "All done! ✨ 🍰 ✨")
         if code is None:
-            click.secho(str(report), err=True)
+            click.echo(str(report), err=True)
     ctx.exit(report.return_code)
 
 
@@ -785,7 +804,8 @@ def format_stdin_to_stdout(
         )
         if write_back == WriteBack.YES:
             # Make sure there's a newline after the content
-            dst += "" if dst[-1] == "\n" else "\n"
+            if dst and dst[-1] != "\n":
+                dst += "\n"
             f.write(dst)
         elif write_back in (WriteBack.DIFF, WriteBack.COLOR_DIFF):
             now = datetime.utcnow()