Determine which of a topic's name/aliases are actually callable

A topic is "callable" for heading purposes if its own name (or one of its aliases) literally appears followed by ( in its \\usage{} block

• e.g. mutate.Rd has usage mutate(.data, ...), so "mutate" qualifies. Datasets and concept pages (\\usage{} is just a bare name, or empty) never qualify. A single Rd topic can document several callables at once (e.g. lead-lag.Rd documents both lead() and lag(), with topic name "lead-lag" matching neither) - hence this returns a vector, not a single yes/no.

Usage

.callable_names(topic)

Arguments

topic

Parsed topic list.

Value

Character vector of callable names (possibly empty).