-h, --help Show this message and exit.
```
+There is no official blackd client tool (yet!). You can test that blackd is
+working using `curl`:
+
+```
+blackd --bind-port 9090 & # or let blackd choose a port
+curl -s -XPOST "localhost:9090" -d "print('valid')"
+```
+
### Protocol
`blackd` only accepts `POST` requests at the `/` path. The body of the request
Avoid using `args` in the hook. Instead, store necessary configuration
in `pyproject.toml` so that editors and command-line usage of Black all
-behave consistently for your project. See *Black*'s own `pyproject.toml`
+behave consistently for your project. See *Black*'s own [pyproject.toml](/pyproject.toml)
for an example.
If you're already using Python 3.7, switch the `language_version`
`file-mode` is an int flag that determines whether the file was formatted as 3.6+ only,
as .pyi, and whether string normalization was omitted.
+To override the location of these files on macOS or Linux, set the environment variable
+`XDG_CACHE_HOME` to your preferred location. For example, if you want to put the cache in
+the directory you're running *Black* from, set `XDG_CACHE_HOME=.cache`. *Black* will then
+write the above files to `.cache/black/<version>/`.
## Used by
The following notable open-source projects trust *Black* with enforcing
a consistent code style: pytest, tox, Pyramid, Django Channels, Hypothesis,
-attrs, SQLAlchemy, Poetry, PyPA applications (Warehouse, Pipenv, virtualenv).
+attrs, SQLAlchemy, Poetry, PyPA applications (Warehouse, Pipenv, virtualenv),
+every Datadog Agent Integration.
Are we missing anyone? Let us know.
* fixed bug that led *Black* format some code with a line length target
of 1 (#762)
+* *Black* no longer introduces quotes in f-string subexpressions on string
+ boundaries (#863)
+
### 19.3b0