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Merge pull request #2681 from phihag/readme-dev-instructions
[README] Improve developer instructions
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README.md
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README.md
@ -371,7 +371,67 @@ If you want to create a build of youtube-dl yourself, you'll need
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### Adding support for a new site
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If you want to add support for a new site, copy *any* [recently modified](https://github.com/rg3/youtube-dl/commits/master/youtube_dl/extractor) file in `youtube_dl/extractor`, add an import in [`youtube_dl/extractor/__init__.py`](https://github.com/rg3/youtube-dl/blob/master/youtube_dl/extractor/__init__.py). Have a look at [`youtube_dl/common/extractor/common.py`](https://github.com/rg3/youtube-dl/blob/master/youtube_dl/extractor/common.py) for possible helper methods and a [detailed description of what your extractor should return](https://github.com/rg3/youtube-dl/blob/master/youtube_dl/extractor/common.py#L38). Don't forget to run the tests with `python test/test_download.py TestDownload.test_YourExtractor`! For a detailed tutorial, refer to [this blog post](http://filippo.io/add-support-for-a-new-video-site-to-youtube-dl/).
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If you want to add support for a new site, you can follow this quick list (assuming your service is called `yourextractor`):
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1. [Fork this repository](https://github.com/rg3/youtube-dl/fork)
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2. Check out the source code with `git clone git@github.com:YOUR_GITHUB_USERNAME/youtube-dl.git`
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3. Start a new git branch with `cd youtube-dl; git checkout -b yourextractor`
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4. Start with this simple template and save it to `youtube_dl/extractor/yourextractor.py`:
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# coding: utf-8
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from __future__ import unicode_literals
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import re
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from .common import InfoExtractor
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class YourExtractorIE(InfoExtractor):
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_VALID_URL = r'https?://(?:www\.)yourextractor\.com/watch/(?P<id>[0-9]+)'
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_TEST = {
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'url': 'http://yourextractor.com/watch/42',
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'md5': 'TODO: md5 sum of the first 10KiB of the video file',
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'info_dict': {
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'id': '42',
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'ext': 'mp4',
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'title': 'Video title goes here',
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# TODO more properties, either as:
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# * A value
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# * MD5 checksum; start the string with md5:
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# * A regular expression; start the string with re:
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# * Any Python type (for example int or float)
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}
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}
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def _real_extract(self, url):
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mobj = re.match(self._VALID_URL, url)
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video_id = mobj.group('id')
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# TODO more code goes here, for example ...
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webpage = self._download_webpage(url, video_id)
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title = self._html_search_regex(r'<h1>(.*?)</h1>', webpage, 'title')
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return {
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'id': video_id,
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'title': title,
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# TODO more properties (see youtube_dl/extractor/common.py)
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}
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5. Add an import in [`youtube_dl/extractor/__init__.py`](https://github.com/rg3/youtube-dl/blob/master/youtube_dl/extractor/__init__.py).
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6. Run `python test/test_download.py TestDownload.test_YourExtractor`. This *should fail* at first, but you can continually re-run it until you're done.
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7. Have a look at [`youtube_dl/common/extractor/common.py`](https://github.com/rg3/youtube-dl/blob/master/youtube_dl/extractor/common.py) for possible helper methods and a [detailed description of what your extractor should return](https://github.com/rg3/youtube-dl/blob/master/youtube_dl/extractor/common.py#L38). Add tests and code for as many as you want.
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8. If you can, check the code with [pyflakes](https://pypi.python.org/pypi/pyflakes) (a good idea) and [pep8](https://pypi.python.org/pypi/pep8) (optional, ignore E501).
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9. When the tests pass, [add](https://www.kernel.org/pub/software/scm/git/docs/git-add.html) the new files and [commit](https://www.kernel.org/pub/software/scm/git/docs/git-commit.html) them and [push](https://www.kernel.org/pub/software/scm/git/docs/git-push.html) the result, like this:
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$ git add youtube_dl/extractor/__init__.py
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$ git add youtube_dl/extractor/yourextractor.py
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$ git commit -m '[yourextractor] Add new extractor'
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$ git push origin yourextractor
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10. Finally, [create a pull request](https://help.github.com/articles/creating-a-pull-request). We'll then review and merge it.
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In any case, thank you very much for your contributions!
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# BUGS
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