First, compute the number of pushes to github repositories aggregated per month, as described here. Perform the query first considering all repositories, the restricting the search to *.github.io repositories. The query restricted to *.github.io repositories is the following:

SELECT LEFT(created_at, 7) as month, COUNT(*) as pushes
FROM [githubarchive:github.timeline]
WHERE
    type='CreateEvent' AND
    RIGHT(repository_name, 10) = '.github.io'
GROUP BY month
ORDER BY month DESC

Then process the created CSV files with the following script, to make the data readable by NVD3:

In [65]:
import csv
import datetime

data = {}
for name in ['All', 'IO']:
    with open('../data/push_monthly_%s_results-20140115.csv' % name, 'rb') as f:
        data[name] = [x for x in csv.reader(f)][1:]
        # Convert 'YYYY-MM' to unix epoch in milliseconds
        times = [datetime.date(int(x[0].split('-')[0]), int(x[0].split('-')[1]), 1)- datetime.timedelta(days=1) for x in data[name]]
        data[name] = zip(times, [x[1] for x in data[name]][1:]) 

# Compute the ratio between pushes to *.github.io repos vs total pushes, for each month
ratios = [(v[0][0].strftime('%s000'), float(v[0][1])/float(v[1][1])*100.0) for v in zip(data['IO'], data['All'])] 
import json
output = []
output.append({'key': '% push to *.github.io vs. total pushes', 'values' : ratios})
with open('../data/githubIO.json', 'w') as f:
    f.write(json.dumps(output))

Finally, place your HTML/JS code to display the data. In this case the code is placed in the _includes directory so it can be loaded with the Jekyll directive:

{% include bladh/github_io_infographic.html %}

from any blog post. The HTML code to generate the graph is adapted from this example.

In [66]:
%%bash
cat ../_includes/bladh/github_io_infographic.html
<style>

#chart1 svg {
  height: 400px;
}

</style>


<div id="chart1">
  <svg></svg>
      <a style = "float:right; margin-top:-1.5em;padding-bottom:.5em; font-size:small" href =
  'http://nbviewer.ipython.org/github/LucaFoschini/lucafoschini.github.io/blob/master/notebooks/GithubIO.ipynb'>See
  how to make this</a>

</div>

<script type="text/javascript">
 d3.json('/data/githubIO.json', function(data) {

nv.addGraph(function() {
  var chart = nv.models.stackedAreaChart()
                .x(function(d) { return d[0] })
                .y(function(d) { return d[1] })
                .tooltips(true)
                .tooltipContent(function(key, y, e, graph) { return e})
                .showControls(false);

  chart.xAxis
      .showMaxMin(false)
      .tickFormat(function(d) { return d3.time.format('%x')(new Date(d)) });

  chart.yAxis
      .tickFormat(d3.format(',.2f'));

  d3.select('#chart1 svg')
    .datum(data)
      .transition().duration(500).call(chart);

  nv.utils.windowResize(chart.update);

  return chart;
});

 })
</script>