add punchcard graphic

Graphing code adapted from https://stackoverflow.com/a/14850998

eodb/events/management/commands/punchcard.py

@@ -0,0 +1,92 @@
+import matplotlib.pyplot as plt
+import numpy as np
+
+from django.core.management.base import BaseCommand
+from django.utils.dateparse import parse_date
+
+from eodb.events.models import Commit
+
+
+class Command(BaseCommand):
+    def add_arguments(self, parser):
+        parser.add_argument('--username', metavar='USERNAME')
+        parser.add_argument('--datemin', metavar='DATEMIN')
+        parser.add_argument('--datemax', metavar='DATEMAX')
+        parser.add_argument('--committime', action='store_true',
+                            help='use commit datetime instead of author datetime')
+
+    def handle(self, *args, **options):
+        infos = {}
+        for i in range(7):
+            for j in range(24):
+                infos[(i, j)] = 0
+
+        filters = {'author_email__endswith': '@entrouvert.com'}
+
+        title = 'Git activity'
+
+        if options.get('username'):
+            filters['author_email__startswith'] = options['username'] + '@'
+            title += ' for %s' % options['username']
+
+        datetime_var = 'author_datetime'
+        if options.get('committime'):
+            datetime_var = 'commit_datetime'
+        if options.get('datemin'):
+            filters[datetime_var + '__gte'] = parse_date(options['datemin'])
+            title += ' from %s' % options['datemin']
+        if options.get('datemax'):
+            filters[datetime_var + '__lt'] = parse_date(options['datemax'])
+            title += ' until %s' % options['datemax']
+
+        for commit in Commit.objects.filter(**filters):
+            coords = (getattr(commit, datetime_var).weekday(), getattr(commit, datetime_var).hour)
+            infos[coords] = infos[coords] + 1
+
+        draw_punchcard(infos)
+        plt.title(title)
+        plt.show()
+
+# https://stackoverflow.com/a/14850998
+def draw_punchcard(infos,
+                ax1=range(7),
+                ax2=range(24),
+                ax1_ticks=['Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday', 'Sunday'],
+                ax2_ticks=range(24),
+                ax1_label='Day',
+                ax2_label='Hour'):
+    # - infos: Dictionary of quantities to display.
+    #          They are indexed by key of type (val1,val2) with
+    #          val1 included in ax1 and val2 included in ax2.
+
+    # build the array which contains the values
+    data = np.zeros((len(ax1),len(ax2)))
+    for key in infos:
+        data[key[0],key[1]] = infos[key]
+    data = data/float(np.max(data))
+
+    # shape ratio
+    r = float(data.shape[1])/data.shape[0]
+
+    # Draw the punchcard (create one circle per element)
+    # Ugly normalisation allows to obtain perfect circles instead of ovals....
+    for y in range(data.shape[0]):
+        for x in range(data.shape[1]):
+            circle = plt.Circle((x/float(data.shape[1]-1)*(data.shape[0]-1),y/r),
+                                data[y][x]/float(data.shape[1])*data.shape[0]/2)
+            plt.gca().add_artist(circle)
+
+    plt.ylim(0-0.5,  data.shape[0]-0.5)
+    plt.xlim(0, data.shape[0])
+    plt.yticks(np.arange(0,len(ax1)/r-.1,1/r), ax1_ticks)
+    xt = np.linspace(0, len(ax1)-1, len(ax2))
+    plt.xticks(xt, ax2_ticks)
+    plt.xlabel(ax2_label)
+    plt.ylabel(ax1_label)
+    plt.gca().invert_yaxis()
+
+    # make sure the axes are equal, and resize the canvas to fit the plot
+    plt.axis('equal')
+    plt.axis([-1, 7, 7/r, -1])
+    scale = 1 #0.5
+    plt.gcf().set_size_inches(data.shape[1]*scale,data.shape[0]*scale, forward=True)