[phihag_]

We're simply making use of Python's ability to load a module from a zip file [0]. Therefore, the generation[1] is just zipping up all the files and prepending a shebang.

[0] http://bugs.python.org/issue1739468 [1] https://github.com/rg3/youtube-dl/blob/640743233389714dda8a3...

[pyre]

This:

  youtube-dl: youtube_dl/*.py youtube_dl/*/*.py
  	zip --quiet youtube-dl youtube_dl/*.py youtube_dl/*/*.py
  	zip --quiet --junk-paths youtube-dl youtube_dl/__main__.py
  	echo '#!$(PYTHON)' > youtube-dl
  	cat youtube-dl.zip >> youtube-dl
  	rm youtube-dl.zip
  	chmod a+x youtube-dl

Might be less confusing if you append '.zip' in the first two commands:

  	zip --quiet youtube-dl.zip youtube_dl/*.py youtube_dl/*/*.py
  	zip --quiet --junk-paths youtube-dl.zip youtube_dl/__main__.py

When you echo the shebang overwriting the file, I was thrown off. I'm thinking, "Why did you just zip all those contents into the file to just throw them out?" Then I see the `cat` line, and it makes sense that the `zip` command appends the .zip to the end of the file.