Add histogram.py, simple script to print a histogram of the frequency…

… of the input lines

histogram.py

@@ -0,0 +1,25 @@
+#!/usr/bin/env python
+#
+# Print histogram of frequency of input lines
+#
+# Maintained at http://github.com/liyanage/macosx-shell-scripts
+#
+
+
+import fileinput
+import collections
+import subprocess
+
+data = collections.Counter()
+data.update(fileinput.input())
+sorted_items = sorted(data.items(), cmp=lambda a, b: cmp(b[1], a[1]))
+
+with open('/dev/tty') as tty:
+    h, w = [int(x) for x in subprocess.check_output(['stty', 'size'], stdin=tty).split()]
+
+max_bar_length = w / 2 - 10
+scale = float(max_bar_length) / sorted_items[0][1]
+
+for location, count in sorted_items:
+    bar_length = int(scale * count)
+    print '{:{width}}  {:4}  {}'.format(location.strip()[:w/2], count, '*' * bar_length, width=w / 2)