Millet

Standard ML (SML) support for VS Code.

See the blog post introducing the project.

Warning

The language server is beta-quality software. It might be slow, wrong, incomplete, or unstable.

You can turn it off by setting millet.useLanguageServer to false in your VS Code settings.

Features

• Syntax highlighting
• Language configuration (comments, brackets, etc)
• Snippets
• Inline errors
• Hover for type/documentation
• Go to definition/type definition

Usage

1. Install the extension.
2. Open VS Code to a folder containing a single "group file", i.e. one of
   • a ML Basis file, with extension .mlb
   • a SML/NJ CM file, with extension .cm
3. Ensure that group file lists all the SML/other group files in the folder, in the order you wish for them to be analyzed.

Note: If a file is not transitively reachable from the root group file, it will not be analyzed.

Example

sources.mlb

Foo.sml
Bar.sml

Foo.sml

structure Foo = struct
  fun fact 0 = 1
    | fact n = n * fact (n - 1)
end

Bar.sml

val _ = Foo.fact 3