Merge pull request #123 from facetoe/master

Added method for printing a graph of Unicode characters.

i3pystatus/core/util.py

@@ -364,6 +364,31 @@ def internet():
     except OSError:
         return False
 
+def make_graph(values, upper_limit=100.0):
+    """
+    Draws a graph made of unicode characters.
+
+    :param values: An array of values to graph.
+    :param upper_limit: Maximum value for the y axis.
+    :returns: Bar as a string
+    """
+    values = [float(n) for n in values]
+
+    # Add the upper limit to the end of the array so the graph doesn't distort
+    # as high values drop off the end.
+    values.append(float(upper_limit))
+
+    bar = u'_▁▂▃▄▅▆▇█'
+    bar_count = len(bar) - 1
+    mn, mx = min(values), max(values)
+    extent = mx - mn
+    if extent == 0:
+        graph = '_' * len(values)
+    else:
+        graph = ''.join(bar[int( (n - mn) / extent * bar_count)]
+                        for n in values[:len(values)-1])  # Don't show the upper limit value.
+    return graph
+
 def make_bar(percentage):
     """
     Draws a bar made of unicode box characters.