Create task for downloading images

lib/tasks/download_images.rake

@@ -0,0 +1,41 @@
+namespace :granblue do
+  def _progress_reporter(count:, total:, result:, bar_len: 40, multi: true)
+    filled_len = (bar_len * count / total).round
+    status = File.basename(result)
+    percents = (100.0 * count / total).round(1)
+    bar = '=' * filled_len + '-' * (bar_len - filled_len)
+
+    if !multi
+      print("[#{bar}] #{percents}% ...#{' ' * 20}#{status}\n")
+    else
+      print "\n"
+    end
+  end
+
+  desc 'Exports a list of character URLs for a given size'
+  task :download_images, %i[object size] => :environment do |_t, args|
+    require 'open-uri'
+
+    filename = "export/#{args[:object]}-#{args[:size]}.txt"
+    count = `wc -l #{filename}`.split.first.to_i
+
+    path = "#{Rails.root}/download/#{args[:object]}-#{args[:size]}"
+    FileUtils.mkdir_p(path) unless Dir.exist?(path)
+
+    puts "Downloading #{count} images from #{args[:object]}-#{args[:size]}.txt..."
+    if File.exist?(filename)
+      File.readlines(filename).each_with_index do |line, i|
+        download = URI.parse(line.strip).open
+        download_URI = "#{path}/#{download.base_uri.to_s.split('/')[-1]}"
+        if File.exist?(download_URI)
+          puts "Skipping #{line}"
+        else
+          IO.copy_stream(download, "#{path}/#{download.base_uri.to_s.split('/')[-1]}")
+          _progress_reporter(count: i, total: count, result: download_URI, bar_len: 40, multi: false)
+        end
+      rescue StandardError => e
+        puts "#{e}: #{line}"
+      end
+    end
+  end
+end