Merge branch 'master' into activestorage-guide

1 files changed, 8 insertions, 1 deletions

diff --git a/activestorage/lib/active_storage/previewer/pdf_previewer.rb b/activestorage/lib/active_storage/previewer/pdf_previewer.rb
index a2f05c74a6..b84aefcc9c 100644
--- a/activestorage/lib/active_storage/previewer/pdf_previewer.rb
+++ b/activestorage/lib/active_storage/previewer/pdf_previewer.rb
@@ -2,16 +2,23 @@
 
 module ActiveStorage
   class Previewer::PDFPreviewer < Previewer
+    class_attribute :mutool_path, default: "mutool"
+
     def self.accept?(blob)
       blob.content_type == "application/pdf"
     end
 
     def preview
       download_blob_to_tempfile do |input|
-        draw "mutool", "draw", "-F", "png", "-o", "-", input.path, "1" do |output|
+        draw_first_page_from input do |output|
           yield io: output, filename: "#{blob.filename.base}.png", content_type: "image/png"
         end
       end
     end
+
+    private
+      def draw_first_page_from(file, &block)
+        draw mutool_path, "draw", "-F", "png", "-o", "-", file.path, "1", &block
+      end
   end
 end