Open Source Scala Browser Extensions and Plugins

When I was learning Haskell, I missed the nice features of IntelliJ IDEA. My first approach was to use the default way of creating an IntelliJ plugin by defining a grammar and a lexer according to Haskell report. That didn't work out because I could not define all the recursion. Then I decided to use grammar and lexer definitions only for tokenizing and parsing Haskell code, and not for syntax checking the code. This is needed for syntax highlighting, all kinds of navigation, and so on. Further Haskell language support is provided with the help of external tools. Show error action to view formatted messages. Useful in case message consists of multiple lines (Ctrl-F10, Meta-F10 on Mac OSX); Intention actions to add language extension (depends on compiler error), add top-level type signature (depends on compiler warning). Intention action to select which module to import if the identifier is not in scope.

An sbt plugin enhancing the evicted key. sbt has been gradually providing these features. As of sbt 1.5.0, all of the features of this plugin are now supported by sbt out of the box. Nevertheless, this plugin can be useful if you are stuck with an old version of sbt. Unlike the default evicted task, the eviction warnings task reports only problematic evictions (ie, libraries that have been evicted by binary incompatible versions). This task turns the eviction warnings into errors. It succeeds only if there are no eviction warnings in your build. You typically want to invoke this task in your CI, to make sure that no pull requests introduce eviction warnings. The recommended versioning scheme in the Scala ecosystem is a (stricter) variant of Semantic Versioning, but not all libraries follow this versioning scheme.