ripper module finished

shard.yml

@@ -13,5 +13,5 @@ crystal: 0.28.0
 license: MIT
 
 dependencies:
-  spotify:
-    github: marceloboeira/spotify.cr
+     ydl_binaries:
+       github: cooperhammond/ydl-binaries

src/interact/ripper.cr

@@ -0,0 +1,37 @@
+module Ripper
+
+  extend self
+
+  BIN_LOC = Path["~/.irs/bin".sub("~", Path.home)]
+
+  # Downloads the video from the given *video_url* using the youtube-dl binary
+  # Will create any directories that don't exist specified in *output_filename*
+  #
+  # ```
+  # Ripper.download_mp3("https://youtube.com/watch?v=0xnciFWAqa0", 
+  #   "Queen/A Night At The Opera/Bohemian Rhapsody.mp3")
+  # ```
+  def download_mp3(video_url : String, output_filename : String)
+    ydl_loc = BIN_LOC.join("youtube-dl")
+    
+    # remove the extension that will be added on by ydl
+    output_filename = output_filename.split(".")[..-2].join(".")
+
+    options = {
+      "--output" => %("#{output_filename}.%(ext)s"), # auto-add correct ext
+      # "--quiet" => "",
+      "--ffmpeg-location" => BIN_LOC,
+      "--extract-audio" => "",
+      "--audio-format" => "mp3",
+      "--audio-quality" => "0",
+    }
+
+    command = ydl_loc.to_s + " " + video_url
+    options.keys.each do |option|
+      command += " #{option} #{options[option]}"
+    end
+    
+    system(command)
+  end
+
+end