diff --git a/src/checker.rs b/src/checker.rs
new file mode 100644
index 0000000..dd9b032
--- /dev/null
+++ b/src/checker.rs
@@ -0,0 +1,87 @@
+use anyhow::{Context, Result};
+use github_rs::client::{Executor, Github};
+use github_rs::StatusCode;
+use regex::Regex;
+use reqwest::header::{self, HeaderValue};
+use serde_json::Value;
+use url::Url;
+
+/// A link checker using an API token for Github links
+/// otherwise a normal HTTP client.
+pub(crate) struct Checker {
+    reqwest_client: reqwest::blocking::Client,
+    gh_client: Github,
+}
+
+impl Checker {
+    /// Creates a new link checker
+    pub fn try_new(token: String) -> Result<Self> {
+        let mut headers = header::HeaderMap::new();
+        // Faking the user agent is necessary for some websites, unfortunately.
+        // Otherwise we get a 403 from the firewall (e.g. Sucuri/Cloudproxy on ldra.com).
+        headers.insert(header::USER_AGENT, HeaderValue::from_str("curl/7.71.1")?);
+        headers.insert(header::TRANSFER_ENCODING, HeaderValue::from_str("chunked")?);
+
+        let reqwest_client = reqwest::blocking::ClientBuilder::new()
+            .gzip(true)
+            .default_headers(headers)
+            .build()?;
+
+        let gh_client = Github::new(token).unwrap();
+        Ok(Checker {
+            reqwest_client,
+            gh_client,
+        })
+    }
+
+    fn check_github(&self, owner: String, repo: String) -> bool {
+        let (_headers, status, _json) = self
+            .gh_client
+            .get()
+            .repos()
+            .owner(&owner)
+            .repo(&repo)
+            .execute::<Value>()
+            .expect("Get failed");
+        status == StatusCode::OK
+    }
+
+    fn check_normal(&self, url: &Url) -> bool {
+        let res = self.reqwest_client.get(url.as_str()).send();
+        if res.is_err() {
+            warn!("Cannot send request: {:?}", res);
+            return false;
+        }
+        if let Ok(res) = res {
+            if res.status().is_success() {
+                true
+            } else {
+                warn!("Request with non-ok status code: {:?}", res);
+                false
+            }
+        } else {
+            warn!("Invalid response: {:?}", res);
+            false
+        }
+    }
+
+    fn extract_github(&self, url: &str) -> Result<(String, String)> {
+        let re = Regex::new(r"github\.com/([^/]*)/([^/]*)")?;
+        let caps = re.captures(&url).context("Invalid capture")?;
+        let owner = caps.get(1).context("Cannot capture owner")?;
+        let repo = caps.get(2).context("Cannot capture repo")?;
+        Ok((owner.as_str().into(), repo.as_str().into()))
+    }
+
+    pub fn check(&self, url: &Url) -> bool {
+        if self.check_normal(&url) {
+            return true;
+        }
+        // Pull out the heavy weapons in case of a failed normal request.
+        // This could be a Github URL and we run into the rate limiter.
+        if let Ok((owner, repo)) = self.extract_github(url.as_str()) {
+            return self.check_github(owner, repo);
+        }
+        false
+    }
+}
diff --git a/src/extract.rs b/src/extract.rs
new file mode 100644
index 0000000..b389728
--- /dev/null
+++ b/src/extract.rs
@@ -0,0 +1,20 @@
+use pulldown_cmark::{Event, Parser, Tag};
+use std::collections::HashSet;
+use url::Url;
+
+pub(crate) fn extract_links(md: &str) -> HashSet<Url> {
+    let mut links: Vec<String> = Vec::new();
+    Parser::new(md).for_each(|event| match event {
+        Event::Start(Tag::Link(_, link, _)) => links.push(link.into_string()),
+        Event::Start(Tag::Image(_, link, _)) => links.push(link.into_string()),
+        _ => (),
+    });
+
+    // Only keep legit URLs. This sorts out things like anchors.
+    // Silently ignore the parse failures for now.
+    // TODO: Log errors in verbose mode
+    let links: HashSet<Url> = links.iter().flat_map(|l| Url::parse(&l)).collect();
+    debug!("Testing links: {:#?}", links);
+
+    links
+}
diff --git a/src/main.rs b/src/main.rs
index e419b4c..22dfd69 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,111 +1,16 @@
 #[macro_use]
 extern crate log;
 
-use anyhow::{Context, Result};
-use github_rs::client::{Executor, Github};
-use github_rs::StatusCode;
-use pulldown_cmark::{Event, Parser, Tag};
-use regex::Regex;
-use reqwest::header::{self, HeaderValue};
-use serde_json::Value;
+mod checker;
+mod extract;
+
+use checker::Checker;
+use extract::extract_links;
+
+use anyhow::Result;
 use std::env;
-use std::{collections::HashSet, fs};
-use url::Url;
 
-struct Checker {
-    reqwest_client: reqwest::blocking::Client,
-    gh_client: Github,
-}
-
-impl Checker {
-    /// Creates a new link checker
-    pub fn try_new(token: String) -> Result<Self> {
-        let mut headers = header::HeaderMap::new();
-        // Faking the user agent is necessary for some websites, unfortunately.
-        // Otherwise we get a 403 from the firewall (e.g. Sucuri/Cloudproxy on ldra.com).
-        headers.insert(header::USER_AGENT, HeaderValue::from_str("curl/7.71.1")?);
-        headers.insert(header::TRANSFER_ENCODING, HeaderValue::from_str("chunked")?);
-
-        let reqwest_client = reqwest::blocking::ClientBuilder::new()
-            .gzip(true)
-            .default_headers(headers)
-            .build()?;
-
-        let gh_client = Github::new(token).unwrap();
-        Ok(Checker {
-            reqwest_client,
-            gh_client,
-        })
-    }
-
-    fn check_github(&self, owner: String, repo: String) -> bool {
-        let (_headers, status, _json) = self
-            .gh_client
-            .get()
-            .repos()
-            .owner(&owner)
-            .repo(&repo)
-            .execute::<Value>()
-            .expect("Get failed");
-        status == StatusCode::OK
-    }
-
-    fn check_normal(&self, url: &Url) -> bool {
-        let res = self.reqwest_client.get(url.as_str()).send();
-        if res.is_err() {
-            warn!("Cannot send request: {:?}", res);
-            return false;
-        }
-        if let Ok(res) = res {
-            if res.status().is_success() {
-                true
-            } else {
-                warn!("Request with non-ok status code: {:?}", res);
-                false
-            }
-        } else {
-            warn!("Invalid response: {:?}", res);
-            false
-        }
-    }
-
-    fn extract_github(&self, url: &str) -> Result<(String, String)> {
-        let re = Regex::new(r"github\.com/([^/]*)/([^/]*)")?;
-        let caps = re.captures(&url).context("Invalid capture")?;
-        let owner = caps.get(1).context("Cannot capture owner")?;
-        let repo = caps.get(2).context("Cannot capture repo")?;
-        Ok((owner.as_str().into(), repo.as_str().into()))
-    }
-
-    pub fn check(&self, url: &Url) -> bool {
-        if self.check_normal(&url) {
-            return true;
-        }
-        // Pull out the heavy weapons in case of a failed normal request.
-        // This could be a Github URL and we run into the rate limiter.
-        if let Ok((owner, repo)) = self.extract_github(url.as_str()) {
-            return self.check_github(owner, repo);
-        }
-        false
-    }
-}
-
-fn extract_links(md: &str) -> HashSet<Url> {
-    let mut links: Vec<String> = Vec::new();
-    Parser::new(md).for_each(|event| match event {
-        Event::Start(Tag::Link(_, link, _)) => links.push(link.into_string()),
-        Event::Start(Tag::Image(_, link, _)) => links.push(link.into_string()),
-        _ => (),
-    });
-
-    // Only keep legit URLs. This sorts out things like anchors.
-    // Silently ignore the parse failures for now.
-    // TODO: Log errors in verbose mode
-    let links: HashSet<Url> = links.iter().flat_map(|l| Url::parse(&l)).collect();
-    debug!("Testing links: {:#?}", links);
-
-    links
-}
+use std::fs;
 
 struct Args {
     verbose: bool,