print-uri-tags.rb

require 'net/http'
require 'tempfile'
require 'taglib'

if ARGV[0].nil?
  $stderr.puts "Syntax: #{$0} <uri>"
  exit 1
end
uri = URI(ARGV[0])
ext = uri.path.split('.').last

file = Tempfile.new(['foo', ".#{ext}"])
Net::HTTP.start(uri.host, uri.port) do |http|
  req = Net::HTTP::Get.new uri
  http.request(req) do |res|
    res.read_body do |chunk|
      file.write(chunk)
    end
  end
end
file.close

TagLib::FileRef.open(file.path, false) do |fileref|
  if fileref.null?
    puts "No tags found."
  else
    tag = fileref.tag
    puts "Title:   #{tag.title}"
    puts "Artist:  #{tag.artist}"
    puts "Album:   #{tag.album}"
    puts "Year:    #{tag.year}"
    puts "Track:   #{tag.track}"
    puts "Genre:   #{tag.genre}"
    puts "Comment: #{tag.comment}"
  end
end