Only last week, Chris wrote about what's new in Scala Clippy, which included highlighting diffs in type mismatch errors.

This week (in version 0.5.0), we are introducing another color-related feature: syntax highlighting in the Scala compiler output!

Here's how it looks in practice:

Much nicer than the all-same-color default, isn't it?

But what is Clippy?

Clippy is a Scala compiler plugin which enriches compilation errors with advice. The advice database is community-maintained. Take a look at the website to find out more!

How can I use it?

The easiest way to use Clippy is through an SBT plugin. You can enable Clippy globally by first adding the following to ~/.sbt/0.13/plugins/build.sbt:

addSbtPlugin("com.softwaremill.clippy" % "plugin-sbt" % "0.5.0")

Color-related features are currently disabled by default. To enable them, edit ~/.sbt/0.13/build.sbt and add:

import com.softwaremill.clippy.ClippySbtPlugin._
clippyColorsEnabled := true

Clippy can be also used directly as a compiler plugin, and configured via compiler plugin options (without SBT). See the readme for details.

Custom colors

As for the question you are probably asking yourselves right now - yes, you can customize the colors that Clippy uses for syntax highlighting. For example, to customize the color of literals, in ~/.sbt/0.13/build.sbt add:

clippyColorLiteral := Some(ClippyColor.Magenta)

Credits

The syntax highlighting is copied from Ammonite and also uses open-source libraries by Li Haoyi - thanks for the great work!

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