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https://github.com/jhipster/prettier-java

Prettier Java Plugin
https://github.com/jhipster/prettier-java

java prettier

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Prettier Java Plugin

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README 

        
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# Prettier Java



![Prettier Java Banner](./logo/prettier-java-wide-dark.svg#gh-dark-mode-only)

![Prettier Java Banner](./logo/prettier-java-wide-light.svg#gh-light-mode-only)



## Intro



Prettier is an opinionated code formatter. It enforces a consistent style by parsing your code and re-printing it with its own rules that take the maximum line length into account, wrapping code when necessary.



## How it works



A Prettier plugin must first parse the source code of the target language

into a traversable data structure (Usually an **A**bstract **S**yntax **T**ree)

and then print out that data structure in a "pretty" style.



Prettier-Java uses a [Java-Parser](./packages/java-parser) implemented in JavaScript using the

[Chevrotain Parser Building Toolkit for JavaScript](https://github.com/SAP/chevrotain).

What this means is that unlike many other Prettier plugins,

`prettier-java` has **no additional runtime pre-requisites** (e.g: Python executable).

It could even be used inside a browser.



## Subpackages



This project contains 2 packages:



- [prettier-plugin-java](./packages/prettier-plugin-java) A plugin for

  [Prettier](https://prettier.io/) to format Java code



  [![npm-prettier-plugin-java][npm-prettier-plugin-java-image]][npm-prettier-plugin-java-url]



* [java-parser](./packages/java-parser) A Java Parser using [Chevrotain](https://github.com/SAP/chevrotain) which output a **C**oncrete **S**yntax **T**ree



  [![npm-java-parser][npm-java-parser-image]][npm-java-parser-url]



[npm-prettier-plugin-java-image]: https://img.shields.io/npm/v/prettier-plugin-java.svg?color=blue&label=prettier-plugin-java&logo=prettier-plugin-java

[npm-prettier-plugin-java-url]: https://www.npmjs.com/package/prettier-plugin-java

[npm-java-parser-image]: https://img.shields.io/npm/v/java-parser.svg?color=blue&label=java-parser&logo=java-parser

[npm-java-parser-url]: https://www.npmjs.com/package/java-parser



## Install



### Pre-requirements



- [Node version](https://nodejs.org/en/download/releases/) 10+

- [Prettier](https://github.com/prettier/prettier)



### Install Prettier and Prettier-Java plugin



```bash

# Local installation

npm install prettier-plugin-java --save-dev



# Or globally

npm install -g prettier prettier-plugin-java

```



or with yarn:



```bash

# Local installation

yarn add prettier-plugin-java --dev



# Or globally

yarn global add prettier prettier-plugin-java

```



Note: If you want to install the prettier-plugin-java globally, you should also install the prettier package globally.



## Usage



To reformat all your Java files, you first need to create `.prettierrc.yaml` with following content:



```yaml

plugins:

  - prettier-plugin-java

```



Then run:



```bash

# If you have installed the package locally

npx prettier --write "**/*.java"



# Or globally

prettier --write "**/*.java"

```



To see an advanced usage: please go to the [Advanced Usage](./docs/advanced_usage.md) section



## Maven plugin



A neat maven plugin for prettier-java was made by developers from HubSpot. \

Add it to the `plugins` section of your `build` configuration



```xml



  

    

      com.hubspot.maven.plugins

        prettier-maven-plugin

        

        0.8

    

  



```



If you would like to use this plugin, we recommend you to check their [project](https://github.com/HubSpot/prettier-maven-plugin) as is it well documented.



## Organize imports



Prettier-java is currently sorting imports according to the [Google Java Style guide](https://google.github.io/styleguide/javaguide.html#s3.3-import-statements).



If you are using an IDE such as IntelliJ, you might want to configure it to match with Prettier-java.



For IntelliJ, you can use this configuration:

![IntelliJ config](./docs/intellij_imports_config.png)



You can also import the Checkstyle configuration provided in the next section.



For VSCode with [Language Support for Java](https://marketplace.visualstudio.com/items?itemName=redhat.java), you can use this configuration (`settings.json`):



```json

{

  "java.completion.importOrder": ["#"]

}

```



## Checkstyle configuration



You can use Prettier in combination with other linter, like Checkstyle.



Here is one [Checkstyle Prettier compatible configuration](./docs/checkstyle/checkstyle.xml) you can use to start with !



You can directly import the config into IntelliJ Idea for instance:



![Import Checkstyle configuration](./docs/checkstyle/import-checkstyle-configuration.gif)



## Indent configuration



In `.prettierrc.yaml`, you can configure the indent:



For using four spaces:



```yaml

tabWidth: 4

```



For more configuration options such as using tabs, maximum line length, and more see .



## Contributing



Contributions are very welcome.

See the [contribution guide](./CONTRIBUTING.md) to get started.

And the [Help Wanted](https://github.com/jhipster/prettier-java/labels/help%20wanted) issues.



## Credits



Special thanks to [@thorbenvh8](https://github.com/thorbenvh8) for creating the original `prettier-java`

plugin and the associated Java Parser implemented in JavaScript.



We would also like to thank the [Chevrotain](https://github.com/SAP/chevrotain/graphs/contributors) and [Prettier](https://github.com/prettier/prettier/graphs/contributors) contributors which made this possible.