break pie chart into separate function

smem

@@ -390,40 +390,8 @@ def showtable(rows, fields, columns, sort):
     l.sort(reverse=bool(options.reverse))
 
     if options.pie:
-        if (l[0][0] < l[-1][0]):
-            l.reverse()
-        try:
-            import pylab
-        except ImportError:
-            sys.write.stderr("pie chart requires matplotlib")
-            sys.exit(-1)
-
-        labels = [r[1][-1] for r in l]
-        values = [r[0] for r in l] # sort field
-
-        tm = totalmem() / 1024
-        s = sum(values)
-        unused = tm - s
-        t = 0
-        while t + values[-1] < (tm * .02) or values[-1] < (tm * .005):
-            t += values.pop()
-            labels.pop()
-        if t:
-            values.append(t)
-            labels.append('other')
-
-        explode = [0] * len(values)
-        if unused > 0:
-            values.insert(0, unused)
-            labels.insert(0, 'unused')
-            explode.insert(0, .05)
-
-        pylab.figure(1, figsize=(6,6))
-        ax = pylab.axes([0.1, 0.1, 0.8, 0.8])
-        pylab.pie(values, explode = explode, labels=labels,
-                  autopct="%.2f%%", shadow=True)
-        pylab.show()
-        sys.exit(1)
+        showpie(l, sort)
+        return
 
     if not options.no_header:
         print header
@@ -444,6 +412,42 @@ def showtable(rows, fields, columns, sort):
         print "-" * len(header)
         print format % tuple([f(v) for f,v in zip(formatter, t)])
 
+def showpie(l, sort):
+    if (l[0][0] < l[-1][0]):
+        l.reverse()
+    try:
+        import pylab
+    except ImportError:
+        sys.stderr.write("pie chart requires matplotlib\n")
+        sys.exit(-1)
+
+    labels = [r[1][-1] for r in l]
+    values = [r[0] for r in l] # sort field
+
+    tm = totalmem() / 1024
+    s = sum(values)
+    unused = tm - s
+    t = 0
+    while t + values[-1] < (tm * .02) or values[-1] < (tm * .005):
+        t += values.pop()
+        labels.pop()
+    if t:
+        values.append(t)
+        labels.append('other')
+
+    explode = [0] * len(values)
+    if unused > 0:
+        values.insert(0, unused)
+        labels.insert(0, 'unused')
+        explode.insert(0, .05)
+
+    pylab.figure(1, figsize=(6,6))
+    ax = pylab.axes([0.1, 0.1, 0.8, 0.8])
+    pylab.pie(values, explode = explode, labels=labels,
+              autopct="%.2f%%", shadow=True)
+    pylab.title('%s by %s' % (options.pie, sort))
+    pylab.show()
+
 parser = optparse.OptionParser("%prog [options]")
 parser.add_option("-H", "--no-header", action="store_true",
                   help="disable header line")