modules/spellfiles: init

update-scripts/fetch-spellfiles.nix

@@ -0,0 +1,44 @@
+{
+  writeShellApplication,
+  curl,
+  nix,
+  ...
+}:
+writeShellApplication {
+  name = "fetch-spellfiles";
+
+  runtimeInputs = [
+    curl
+    nix
+  ];
+
+  text = ''
+    echo "{"
+
+    BASE_URL="https://ftp.nluug.nl/pub/vim/runtime/spell/"
+
+    html=$(curl -s "$BASE_URL")
+
+    # Extract only .spl and .sug file links
+    readarray -t filenames < <(echo "$html" | grep -oP '(?<=href=")[^"]+\.(spl|sug)' | sort -u)
+
+    for filename in "''${filenames[@]}"; do
+
+      url="$BASE_URL$filename"
+
+      # Special characters (like '%40', standing for `@`) are invalid for nix store paths
+      # -> We replace all non-alphanumeric characters with '_' and used this sanitized filename for
+      # the derivation name
+      sanitized_filename="''${filename//[^a-zA-Z0-9]/_}"
+      sha256=$(nix-prefetch-url "$url" --name "$sanitized_filename")
+
+      hash=$(nix hash convert --to sri --hash-algo sha256 "$sha256")
+
+      # Ugly hardcoding of the `%40` -> `@` substitution
+      filename="''${filename//%40/@}"
+      echo -e "  \"$filename\": { url: \"$url\", hash: \"$hash\" },"
+    done
+
+    echo "}"
+  '';
+}