diff --git a/.envrc b/.envrc
new file mode 100644
index 0000000..1d953f4
--- /dev/null
+++ b/.envrc
@@ -0,0 +1 @@
+use nix
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..92b2793
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+.direnv
diff --git a/scihub_knapsack.py b/scihub_knapsack.py
index 1dd7718..7aefa23 100755
--- a/scihub_knapsack.py
+++ b/scihub_knapsack.py
@@ -166,14 +166,22 @@ if __name__ == "__main__":
     # If it's a dry run, only print the knapsack's contents. Otherwise,
     # add the knapsack's contents to the qBittorrent instance.
     # When finished, print the number of items and the combined weight of all
-    # items in the knapsack.
-    if args["--dry-run"]:
+    # items in the knapsack. Before attempting to add items to the qBittorrent
+    # instance, check to see if libgen.rs is even working. If libgen.rs is down
+    # no torrents can be added to the qBittorrent instance, so exit with an
+    # notice.
+    if dry_run:
         for torrent in knapsack:
-            print(torrent["name"])
+            print(torrent["link"])
     else:
+        response = requests.get("https://libgen.rs")
+        if not response.ok:
+            exit(
+                "It appears https://libgen.rs is currently down. Please try again later."
+            )
         for torrent in knapsack:
             qb.download_from_link(torrent["link"], category="scihub")
-            print(f"Added {torrent["name"]}")
+            print(f"Added {torrent['name']}")
 
     print("----------------")
     print(f"Count: {len(knapsack)} torrents")
diff --git a/shell.nix b/shell.nix
index 4fa7d92..0cf0d80 100644
--- a/shell.nix
+++ b/shell.nix
@@ -22,10 +22,15 @@ in pkgs.python312.buildEnv.override rec {
 
   extraLibs = [
     pkgs.python312Packages.beautifulsoup4
+    pkgs.python312Packages.black
     pkgs.python312Packages.bpython
     pkgs.python312Packages.docopt
+    pkgs.python312Packages.isort
+    pkgs.python312Packages.nose
+    pkgs.python312Packages.pytest
     pkgs.python312Packages.requests
     pkgs.python312Packages.rich
+    pyright
     python-qbittorrent
   ];
 }