Scalastyle - Configuration

Quick start

You can just use the default Scalastyle configuration default_config.xml. Right-click this link and select Save link as. This is the one we use for Scalastyle development, so it’s obviously the best :-)

Format of the file

The configuration file is XML containing a list of rules to apply to your Scala source. A (short) example configuration would be:

<scalastyle commentFilter="enabled">
    <name>Scalastyle standard configuration</name>
    <check level="warning" class="org.scalastyle.file.FileTabChecker" enabled="true" />
    <check level="warning" class="org.scalastyle.file.FileLengthChecker" enabled="true">
    <parameters>
    <parameter name="maxFileLength">800</parameter>
    </parameters>
    </check>
</scalastyle>

Each check element is the name of the class which implements the checker along with any parameters. For a list of rules plus parameters, see Implemented Rules.

Comment filters

If you wish to turn off checking for a section of code, you can put a comment in the source before and after the section, with the following syntax:

// scalastyle:off
...
// naughty stuff
...
// scalastyle:on

You can switch off checking for a single line using a comment at the end of the line:

naughty()  // scalastyle:ignore

You can also switch off checking for a specific rule by specifying the id of the rule to ignore:

// scalastyle:off magic.number
var foobar = 134
// scalastyle:on magic.number

Custom messages

If you wish to have a custom error message for a particular checker, then you can do so by defining a customMessage element in the configuration, such as:

<check level="warning" class="org.scalastyle.scalariform.MagicNumberChecker" enabled="true">
    <customMessage>Please don't use magic numbers</customMessage>
</check>

If you wish to have a customId associated with a rule (for instance you may have the same rule with multiple configurations), then you can specify the customId attribute:

<check customId="this.is.custom" level="warning" class="org.scalastyle.scalariform.MagicNumberChecker" enabled="true" />