Moved download to its own function

lib/HahaCommands/download.ex

@@ -26,12 +26,7 @@ defmodule HahaYes.Commands.Download do
     url = Enum.at(args, 0)
     {:ok, loading} = Api.create_message(msg.channel_id, "Downloading...")
 
-
-    opt = ["-f", "bestvideo[height<=?480]+bestaudio/best", url, "-o", "#{System.tmp_dir}/#{msg.id}.%(ext)si", "--force-overwrites", "--playlist-reverse", "--no-playlist", "--remux-video=mp4/webm/mov", "--no-warnings"];
-
-    System.cmd("yt-dlp", opt)
-
-    output = Enum.at(Path.wildcard("#{System.tmp_dir}/#{msg.id}.*"), 0)
+    with {:ok, output} <- HahaYes.Utility.download(url, "#{System.tmp_dir}/#{msg.id}") do
       {:ok, file} = File.stat(output)
       file_size =
         file.size / 1000000.0
@@ -52,5 +47,8 @@ defmodule HahaYes.Commands.Download do
           |> put_footer("You can get the original video by clicking on the \"Downloaded by #{msg.author.username}\" message!")
         Api.create_message(msg.channel_id, files: [output], embeds: [embed])
       end
+    else
+      {:error, error} -> Api.create_message(msg.channel_id, "`#{error}`")
+    end
   end
 end

lib/events/messages.ex

@@ -21,7 +21,7 @@ defmodule HahaYes.Events.MessagesConsumer do
       |> Enum.at(0)
       |> String.downcase()
       |> String.capitalize()
-      |> then(& Module.concat(HahaYes.Commands, &1).execute(msg, ws_state, String.split(String.replace(String.downcase(msg.content), "#{prefix}#{String.downcase(&1)} ", ""))))
+      |> then(& Module.safe_concat(HahaYes.Commands, &1).execute(msg, ws_state, String.split(String.replace(String.downcase(msg.content), "#{prefix}#{String.downcase(&1)} ", ""))))
     end
   end
 end

lib/haha_yes/utils.ex

@@ -0,0 +1,12 @@
+defmodule HahaYes.Utility do
+  def download(url, output, format \\ "bestvideo[height<=?480]+bestaudio/best") do
+    opt = ["-f", format, url, "-o", "#{output}.%(ext)s", "--force-overwrites", "--playlist-reverse", "--no-playlist", "--remux-video=mp4/webm/mov", "--no-warnings"];
+
+    {error_output, status} = System.cmd("yt-dlp", opt, [stderr_to_stdout: true])
+    if status !== 0 do
+      {:error, error_output}
+    else
+      {:ok, Enum.at(Path.wildcard("#{output}.*"), 0)}
+    end
+  end
+end