Current development on the Frege-IDEA-Plugin happens on the intellij-frege project.
Please vote for the issue to make a professional version: https://youtrack.jetbrains.com/issue/IDEABKL-7108
First stab at an IntelliJIdea plugin for the Frege programming language.
Currently it is a mere adaption of the "properties" grammar example in the Custom Language Support Tutorial covering code highlighting and a color settings page.
The bnf only lists the tokens such that the parser generation works.
The lexer is copied from the haskell plugin with only few modifications. More will be needed.