You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: history.rs
    path of file: ./repos/ffsend/src/cmd/matcher
    
    the code of the file until where you have to start completion: use clap::ArgMatches;
use failure::Fail;
use ffsend_api::url::Url;

use super::Matcher;
use crate::host::parse_host;
use crate::util::{quit_error, ErrorHints};

/// The history command matcher.
pub struct HistoryMatcher<'a> {
    #[allow(unused)]
    matches: &'a ArgMatches<'a>,
}

impl<'a> HistoryMatcher<'a
    
    pub fn rm(&'a self) -> Option<Url> {
        // Get the URL
        let url = self.matches.value_of("rm")?;

        // Parse the URL
        match parse_host(&url) {
            Ok(url) => Some(url),
            Err(err) => quit_error(
                err.context("failed to parse the given share URL"),
                ErrorHints::default(),
            ),
        }
    }