# http://www.fsf.org/licensing/licenses/gpl.html
#
+# We need Pathname to get the real filesystem path
+# of this script (and not, for example, the path of
+# a symlink which points to it.
+require 'pathname'
+
+# This bit of magic adds the parent directory (the
+# project root) to the list of ruby load paths.
+# Thus, our require statements will work regardless of
+# how or from where the script was run.
+executable = Pathname.new(__FILE__).realpath.to_s
+$: << File.dirname(executable) + '/../'
+
+# We require the UriUtilities class to handle
+# the download of the video URL.
+require 'src/uri_utilities'
+
+
+# The Dir.glob that's coming up doesn't use the
+# Ruby library path so we need to tell it where to
+# look explicitly.
+websites_pattern = File.dirname(executable) + '/../src/websites/*.rb'
+
# All of the website classes are located in one
# directory, so we can 'require' them automatically.
-Dir.glob('src/websites/*.rb').each do |r|
+Dir.glob(websites_pattern).each do |r|
require r
end
+EXIT_SUCCESS = 0
+EXIT_NO_URL = 1
+EXIT_INVALID_URL = 2
+EXIT_COULDNT_GET_VIDEO_URL = 3
+EXIT_OUTPUT_FILE_ALREADY_EXISTS = 4
+EXIT_ERROR_READING_FROM_VIDEO_URL = 5
+EXIT_CONNECTION_REFUSED = 6
+EXIT_HTTP_ERROR = 7
+EXIT_ACCESS_DENIED = 8
+
# Only actually do something if this script was called
# directly (i.e. not from the tests).
if (__FILE__ == $0) then
# If the user didn't give us a URL, yell
# at him or her.
puts 'Usage: whatever-dl <url>'
- Kernel.exit(1)
+ Kernel.exit(EXIT_NO_URL)
end
- # Check the URL against each website's class.
- # The class will know whether or not the URL
- # "belongs" to its website.
-
- site = nil
-
- Website.subclasses.each do |w|
- if w.owns_url?(ARGV[0])
- site = w.new()
- break
- end
- end
+ # Factory method.
+ site = Website.create(ARGV[0])
if site.nil?
puts 'Invalid URL.'
- exit(1)
+ exit(EXIT_INVALID_URL)
end
- video_url = site.get_video_url(ARGV[0])
+ video_url = site.get_video_url()
if video_url.nil?
puts 'Error retrieving video URL.'
- exit(2)
+ exit(EXIT_COULDNT_GET_VIDEO_URL)
+ end
+
+ video_uri = URI.parse(video_url)
+ uu = UriUtilities.new()
+
+ if File.exists?(site.get_video_filename())
+ puts "Error: output file already exists. Please remove #{site.get_video_filename()}, and try again."
+ Kernel.exit(EXIT_OUTPUT_FILE_ALREADY_EXISTS)
end
- # *classy*
- Kernel.exec("wget \"#{video_url}\"")
+
+ # Attempt to download the file, and rescue and report
+ # any (predictable) exceptions.
+ begin
+ puts "Fetching #{video_url}"
+ puts "Saving as #{site.get_video_filename()}."
+ puts ""
+ uu.download_with_progress_bar(video_uri, site.get_video_filename())
+ rescue Errno::ECONNREFUSED => e
+ puts 'The connection to the server (to download the video file) was refused. Check your connection, and try again later.'
+ Kernel.exit(EXIT_CONNECTION_REFUSED)
+ rescue Errno::EACCES => e
+ puts "Access denied. Check that you have write permission to the output file/directory. Details: #{e.message}."
+ rescue OpenURI::HTTPError => e
+ puts "An HTTP error occurred while downloading the video file: #{e.message}."
+ Kernel.exit(EXIT_HTTP_ERROR)
+ end
+
+ # Write an empty line at the end for aesthetic reasons.
+ puts ""
+
+ Kernel.exit(EXIT_SUCCESS)
end