rfc_index.rs
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rfc_index.rs
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	use std::error::Error;
	use std::fs;
	use std::path::Path;

	static RFC_INDEX_URL: &str = "https://www.ietf.org/download/rfc-index.txt";

	pub async fn get_rfc_index(source: Option<String>) -> Result<String, Box<dyn Error>> {
	match source {
	// Case 1 - A source file has been explicitly set
	Some(file) => Ok(fs::read_to_string(&file)?.parse()?),

	None => {
	if Path::new("rfc-index.txt").exists() {
	// Case 2 - The file rfc-index.txt can be found locally
	Ok(fs::read_to_string("rfc-index.txt")?.parse()?)
	} else {
	// Case 3 - Fetch the index remotely
	Ok(fetch_rfc_index().await?)
	}
	}
	}
	}

	async fn fetch_rfc_index() -> Result<String, Box<dyn Error>> {
	let body = reqwest::get(RFC_INDEX_URL)
	.await?
	.text()
	.await?;

	Ok(body)
	}