.. _bigChain:

bigChain example
----------------
You can read more about preparing the files necessary for a bigChain track
on `UCSC's bigChain help page
<https://genome.ucsc.edu/goldenPath/help/bigChain.html>`_. The following code
uses the example files provided by UCSC.

This code is automatically run and the built trackhub is uploaded to the
`trackhub-demo <https://github.com/daler/trackhub-demo>`_ repository. You can
view the live hub using `this link <http://genome.ucsc.edu/cgi-bin/hgTracks?db=hg38&hubUrl=https://raw.githubusercontent.com/daler/trackhub-demo/master/example_bigChain_hub/bigChain.hub.txt&position=chr22_KI270731v1_random>`_.

.. code-block:: python

    import trackhub

    hub, genomes_file, genome, trackdb = trackhub.default_hub(
        hub_name="bigChain",
        short_label="bigChain",
        long_label="bigChain",
        genome="hg38",
        defaultPos="chr22:1-150754",
        email="eva.jason@nih.gov",
    )

    track = trackhub.Track(
        name="bigChain",
        bigDataUrl="http://genome.ucsc.edu/goldenPath/help/examples/bigChain.bb",
        shortLabel="bigChain",
        longLabel="bigChain Example Hub",
        tracktype="bigChain",
        visibility="pack",
    )
    trackdb.add_tracks(track)

    trackhub.upload.upload_hub(
        hub=hub, host="localhost", remote_dir="example_hubs/example_bigChain_hub"
    )