example/connection.rb in vips-8.11.3 vs example/connection.rb in vips-8.12.1

@@ -1,17 +1,26 @@
 #!/usr/bin/ruby
 
-require 'vips'
+require "vips"
+require "down/http"
 
-file = File.open ARGV[0], "rb"
+# byte_source = File.open ARGV[0], "rb"
+# eg. https://images.unsplash.com/photo-1491933382434-500287f9b54b
+byte_source = Down::Http.open(ARGV[0])
+
 source = Vips::SourceCustom.new
-source.on_read { |length| file.read length }
-# this method is optional
-# source.on_seek { |offset, whence| file.seek(offset, whence) }
+source.on_read do |length|
+  puts "reading #{length} bytes ..."
+  byte_source.read length
+end
+source.on_seek do |offset, whence|
+  puts "seeking to #{offset}, #{whence}"
+  byte_source.seek(offset, whence)
+end
 
-dest = File.open ARGV[1], "wb"
+byte_target = File.open ARGV[1], "wb"
 target = Vips::TargetCustom.new
-target.on_write { |chunk| dest.write(chunk) }
-target.on_finish { dest.close }
+target.on_write { |chunk| byte_target.write(chunk) }
+target.on_finish { byte_target.close }
 
 image = Vips::Image.new_from_source source, "", access: :sequential
-image.write_to_target target, ".png"
+image.write_to_target target, ".jpg"