Function is_cite_command 

pub fn is_cite_command(name: &str) -> bool

Whether name is a citation command (\cite and the natbib/biblatex family, plus \nocite). Capitalized biblatex variants (\Cite, \Textcite, …) and the cite-prefixed natbib set are covered by the prefix check; an explicit short list catches the rest. Keys are comma-separated for all of them.