Odin

Keywords, built-in types, builtin procedures, constants (true/false/nil), operators (::, :=, ->, ---, ..=, ..<, ..), numeric literals, strings ("...", 'c', backtick raw strings), attributes (@(...)) and directives (#partial, …) are all highlighted, along with // line comments and nestable /* */ block comments.

name :: proc and name :: struct/union/enum/bit_field/bit_set declarations highlight name as a function or type name respectively.

Indentation is brace-based ({ }, [ ], ( )), tracks case labels inside switch statements, and de-dents where clauses relative to the declaration they constrain.

C-c C-f (odin-format-buffer) formats the current buffer with odinfmt (ships with ols), preserving the cursor’s line.

Odin mode connects to ols (the Odin Language Server) automatically when editing a .odin file inside a project containing ols.json or odinfmt.json. Install ols and make sure it is on your PATH; see the ols README for installation instructions.

Files with the .odin extension activate odin-mode.