Update git stuff start writing histogram task.

resources/python/tasks.py

@@ -0,0 +1,27 @@
+import datetime
+
+from invoke import task, run
+
+
+@task
+def histogram(ignore=''):
+    result = run('git rev-list --all')
+    date_to_adds = {}
+    date_to_deletes = {}
+    for sha in result.stdout.split('\n'):
+        result = run('git diff-excluding {1} {0}~1 {0} --numstat'.format(sha, ignore), hide=True)
+        added, deleted = get_total(result.stdout)
+        iso8601 = run('git log {0} --pretty=format:%ai -1'.format(sha), hide=True).stdout.strip()
+        commit_date = datetime.datetime.strptime(iso8601, "%Y-%m-%dT%H:%M:%S %z").date()
+        date_to_adds[commit_date] = date_to_adds.get(commit_date) + added
+        date_to_deletes[commit_date] = date_to_deletes.get(commit_date) + deleted
+    print date_to_adds
+    print date_to_deletes
+
+
+def get_total(output):
+    try:
+        return sum(int(line.split()[0]) for line in output.split('\n')), sum(int(line.split()[1]) for line in output.split('\n'))
+    except:
+        import ipdb; ipdb.set_trace()
+