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sbt plugin adding support for source code formatting using Scalariform

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README.md

sbt-scalariform

Welcome to sbt-scalariform, an sbt plugin adding support for source code formatting using Scalariform.

Installing sbt-scalariform

sbt-scalariform is a plugin for sbt 0.13 (and 0.12). Please make sure that you are using an appropriate sbt release. In order to download and install sbt, please refer to sbt Getting Started Guide / Setup.

As sbt-scalariform is a plugin for sbt, it is installed like any other sbt plugin, that is by mere configuration. For details about using sbt plugins, please refer to sbt Getting Started Guide / Using Plugins.

Most probably you can skip the details and just add sbt-scalariform to your local plugin definition. Local plugins are defined in a plugins.sbt file in the project/ folder of your project.

To add sbt-scalariform to your build using sbt 0.13, just add the below setting, paying attention to blank lines:

... // Other settings

addSbtPlugin("com.typesafe.sbt" % "sbt-scalariform" % "1.3.0")

To add sbt-scalariform to your build using sbt 0.12:

... // Other settings

addSbtPlugin("com.typesafe.sbt" % "sbt-scalariform" % "1.0.1")

After adding the sbt-scalariform plugin like this, you still have to configure it, i.e. add the relevant settings to your build definition. Please read on ...

Basic configuration

Add the scalariformSettings to your local build definition file build.sbt or scalariform.sbt:

... // Other settings

scalariformSettings

This will add the task scalariformFormat in the scopes compile and test and additionally run this task automatically when compiling; for more control see the section Advanced configuration below

Now you are ready to go. Either start sbt or, if it was already started, reload the current session by executing the reload command. If everything worked, you should have the new command scalariformFormat available as well automatic formatting on compile and test:compile activated.

Using sbt-scalariform

If you added the settings for this plugin like described above, you can either format your sources manually or automatically:

  • Whenever you run the tasks compile or test:compile, your source files will be automatically formatted by Scalariform

  • If you want to start formatting your source files explicitly, just run the task scalariformFormat or test:scalariformFormat

Advanced configuration

sbt-scalariform comes with various configuration options. Changing the formatting preferences and deactivating the automatic formatting on compile are probably the most important ones and described in detail.

You can provide your own formatting preferences for Scalariform via the setting key ScalariformKeys.preferences which expects an instance of IFormattingPreferences. Make sure you import all necessary members from the package scalariform.formatter.preferences. Let's look at an example:

import scalariform.formatter.preferences._

scalariformSettings

ScalariformKeys.preferences := ScalariformKeys.preferences.value
  .setPreference(AlignSingleLineCaseStatements, true)
  .setPreference(DoubleIndentClassDeclaration, true)
  .setPreference(PreserveDanglingCloseParenthesis, true)

If you don't want sbt to automatically format your source files when the tasks compile or test:compile, just add defaultScalariformSettings instead of scalariformSettings to your build definition.

If you want to additionally enable Scalariform for your integration tests, use scalariformSettingsWithIt or defaultScalariformSettingsWithIt instead of the above.

Other useful configuration options are provided by common sbt setting keys:

  • includeFilter in format: Defaults to **.scala*
  • excludeFilter in format: Using the default of sbt

Mailing list

Please use the sbt mailing list and prefix the subject with [sbt-scalariform].

Contribution policy

Contributions via GitHub pull requests are gladly accepted from their original author. Before we can accept pull requests, you will need to agree to the Typesafe Contributor License Agreement online, using your GitHub account.

License

This code is open source software licensed under the Apache 2.0 License.

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