zyedidia.micro/runtime/syntax/r.yaml

filetype: r

detect: 
    filename: "\\.(r|R)$"

rules:
    - statement: "\\b(break|else|for|function|if|in|next|repeat|return|while)\\b"
    - constant: "\\b(TRUE|FALSE|NULL|Inf|NaN|NA|NA_integer_|NA_real_|NA_complex_|NA_character_)\\b"
    - comment: "#.*$"