-h, --help Show this message and exit.
```
-## primer config file
+## Primer config file
-The config is JSON format. Its main element is the `"projects"` dictionary. Below
-explains each parameter:
+The config file is in JSON format. Its main element is the `"projects"` dictionary and
+each parameter is explained below:
```json
{
}
```
+An example primer config file is used by Black
+[here](https://github.com/psf/black/blob/master/src/black_primer/primer.json)
+
## Example run
```console
## blackd
`blackd` is a small HTTP server that exposes _Black_'s functionality over a simple
-protocol. The main benefit of using it is to avoid paying the cost of starting up a new
-_Black_ process every time you want to blacken a file.
+protocol. The main benefit of using it is to avoid the cost of starting up a new _Black_
+process every time you want to blacken a file.
### Usage
`blackd` is not packaged alongside _Black_ by default because it has additional
-dependencies. You will need to do `pip install black[d]` to install it.
+dependencies. You will need to execute `pip install black[d]` to install it.
You can start the server on the default port, binding only to the local interface by
running `blackd`. You will see a single line mentioning the server's version, and the
-h, --help Show this message and exit.
```
-There is no official blackd client tool (yet!). You can test that blackd is working
+There is no official `blackd` client tool (yet!). You can test that blackd is working
using `curl`:
```sh
in the `Content-Type` request header. If no `charset` is specified, `blackd` assumes
`UTF-8`.
-There are a few HTTP headers that control how the source is formatted. These correspond
-to command line flags for _Black_. There is one exception to this: `X-Protocol-Version`
-which if present, should have the value `1`, otherwise the request is rejected with
-`HTTP 501` (Not Implemented).
+There are a few HTTP headers that control how the source code is formatted. These
+correspond to command line flags for _Black_. There is one exception to this:
+`X-Protocol-Version` which if present, should have the value `1`, otherwise the request
+is rejected with `HTTP 501` (Not Implemented).
-The headers controlling how code is formatted are:
+The headers controlling how source code is formatted are:
- `X-Line-Length`: corresponds to the `--line-length` command line flag.
- `X-Skip-String-Normalization`: corresponds to the `--skip-string-normalization`
blackened Python code, and the `Content-Type` header is set accordingly.
- `HTTP 400`: If the input contains a syntax error. Details of the error are returned in
the response body.
-- `HTTP 500`: If there was any kind of error while trying to format the input. The
+- `HTTP 500`: If there was any other kind of error while trying to format the input. The
response body contains a textual representation of the error.
The response headers include a `X-Black-Version` header containing the version of