feed fetches recent items from multiple sources and prints them to the stdout. It can be used, for example, with Apple Shortcuts to deliver a newsletter periodically.
cargo run -- \
--atom 'Rust Blog=https://blog.rust-lang.org/feed.xml' \
--gnews 'Associated Press=apnews.com' \
--reddit 'Reddit Chess=chess' \
--rss 'Hacker News=https://news.ycombinator.com/rss'