main.rs

#[macro_use]
extern crate lazy_static;
extern crate regex;
extern crate reqwest;

use std::env;
use std::fs::File;
use std::io::prelude::*;
use regex::*;
use reqwest::Client;
use reqwest::Error;

fn get_redirected_url(url: &str) -> Option<String> {
    Client::new()
        .head(url)
        .send()
        .map(|resp| resp.url().as_str().to_string())
        .ok()
}

fn main() {
    let filename = "../tmcw.github.com/_posts/2017-07-01-recently.md";
    let mut f = File::open(filename).expect("file not found");
    let mut contents = String::new();
    f.read_to_string(&mut contents).expect(
        "something went wrong reading the file",
    );

    lazy_static! {
         static ref AMZN_RE: Regex = Regex::new(r"https?://amzn.to/([0-9A-Za-z]+)").unwrap();
         static ref ISBN1: Regex = Regex::new(
             r"https://www.amazon.com/(?:[A-Za-z\-]+)/dp/(\d{10})/").unwrap();
         static ref ISBN2: Regex = Regex::new(
             r"https://www.amazon.com/gp/product/(\d{10})/").unwrap();
     }
    let captures: Vec<_> = AMZN_RE.captures_iter(&contents).collect();

    for cap in captures {
        get_redirected_url(cap.get(0).unwrap().as_str()).and_then(|redirected_to| {
            let c1 = ISBN1.captures(&redirected_to);
            // let c2 = ISBN2.captures(&redirected_to);
            c1
        });
        // .and_then(|capture| {
        //     let isbn = capture.get(1).unwrap().as_str();
        //     let worldcat_url = format!("http://www.worldcat.org/isbn/{}", isbn);
        //     get_redirected_url(&worldcat_url).map(|worldcat_permalink| {
        //         println!("worldcat permalink:\n{:?}", worldcat_permalink);
        //         // contents =
        //         //     contents.replace(capture.get(0).unwrap().as_str(), &worldcat_permalink);
        //     })
        // });
    }
}