Basic mail checker in python

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diff --git a/contrib/check_mail.py b/contrib/check_mail.py
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+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+# This script wraps i3status output and inject mail status, or just reports
+# status on command line.  It is based on 'wrapper.py' script by Valentin
+# Haenel, which could be found at:
+# http://code.stapelberg.de/git/i3status/tree/contrib/wrapper.py
+#
+# To use it, ensure your ~/.i3status.conf contains this line:
+#     output_format = "i3bar"
+# in the 'general' section.
+# Then, in your ~/.i3/config, use:
+#     status_command i3status | path/to/check_mail.py ...
+# In the 'bar' section.
+#
+# Or just run:
+#     ./check_mail.py -1 ...
+#
+# Information on command line arguments (flags) may be obtained by running
+#     ./check_mail.py -h
+#
+# © 2015 Dmitrij D. Czarkoff <czarkoff@gmail.com>
+#
+# Permission to use, copy, modify, and/or distribute this software for any
+# purpose with or without fee is hereby granted, provided that the above
+# copyright notice and this permission notice appear in all copies.
+#
+# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+# REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+# AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+# INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+# LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
+# OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+# PERFORMANCE OF THIS SOFTWARE.
+
+import argparse
+import json
+import os
+import os.path
+import sys
+
+def print_line(message):
+    """ Non-buffered printing to stdout. """
+    sys.stdout.write(message + '\n')
+    sys.stdout.flush()
+
+def read_line():
+    """ Interrupted respecting reader for stdin. """
+    # try reading a line, removing any extra whitespace
+    try:
+        line = sys.stdin.readline().strip()
+        # i3status sends EOF, or an empty line
+        if not line:
+            sys.exit(3)
+        return line
+    # exit on ctrl-c
+    except KeyboardInterrupt:
+        sys.exit()
+
+def check_mail(label, nomail, ignore, colors):
+    """ Check mail in mailbox "label" and return report and color """
+    name = label
+    if not os.path.isabs(name):
+        name = os.path.join(os.environ['HOME'], name)
+
+    if not os.path.exists(name) or os.path.getsize(name) == 0:
+        return nomail, colors[0]
+
+    if os.path.isfile(name):
+        import mailbox
+
+        try:
+            mbox = mailbox.mbox(name, create = False)
+            messages = 0
+            for msg in mbox:
+                if msg.get_flags() == '':
+                    messages += 1
+
+            if messages > 0:
+                return '{0}:{1}'.format(os.path.basename(name),
+                        messages), colors[1]
+            else:
+                return nomail, colors[0]
+
+        except:
+            pass
+
+    elif os.path.isdir(name):
+        report = ''
+        maildirs = 0
+
+        for subdir in os.listdir(name):
+            subdirpath = os.path.join(name, subdir)
+            if 'new' in os.listdir(subdirpath):
+                maildirs += 1
+                if subdir not in ignore:
+                    messages = len(os.listdir(os.path.join(subdirpath, 'new')))
+                    if messages > 0:
+                        report += ' {0}:{1}'.format(subdir, messages)
+
+        if maildirs > 0:
+            if len(report) > 0:
+                return report[1:], colors[1]
+            else:
+                return nomail, colors[0]
+
+    return '{0}: not a mailbox'.format(name), colors[2]
+
+if __name__ == '__main__':
+    parser = argparse.ArgumentParser(description='Check mailboxes.')
+    parser.add_argument('mailbox', help='path to mailbox', type=str, nargs='*',
+            default=['/var/mail/{0}'.format(os.getlogin())])
+    parser.add_argument('-i', '--ignore', action='append', help='ignore named '
+            'mailboxes', type=str, dest='ignore', metavar='mailbox')
+    parser.add_argument('-1', '--once', help='check mailboxes, write results '
+            'to stdout and exit', action='store_true')
+    parser.add_argument('-0', '--nomail', help='text to print if no new mail '
+            'found', type=str, default='')
+    parser.add_argument('-g', '--good', help='color to use when there is no '
+            'new mail', type=str, default='#00FF00')
+    parser.add_argument('-d', '--degraded', help='color to use when there is '
+            'new mail', type=str, default='#FFFF00')
+    parser.add_argument('-b', '--bad', help='color to use when error was '
+            'detected', type=str, default='#FF0000')
+    parser.add_argument('-p', '--position', help='position of mail reports in '
+            'i3bar status', type=int, default=0)
+    args = parser.parse_args()
+
+    colors = [args.good, args.degraded, args.bad]
+
+    if args.once:
+        for name in args.mailbox:
+            report, color = check_mail(name, args.nomail, args.ignore, colors)
+            sys.stderr.write(report + '\n')
+        exit(0)
+
+    # Skip the first line which contains the version header.
+    print_line(read_line())
+
+    # The second line contains the start of the infinite array.
+    print_line(read_line())
+
+    while True:
+        line, prefix = read_line(), ''
+        # ignore comma at start of lines
+        if line.startswith(','):
+            line, prefix = line[1:], ','
+
+        j = json.loads(line)
+        # insert information into the start of the json
+        i = args.position
+        for name in args.mailbox:
+            report, color = check_mail(name, args.nomail, args.ignore, colors)
+            j.insert(i, {
+                    'name' : 'mail',
+                    'instance' : name,
+                    'full_text' : report,
+                    'color' : color
+                        })
+            i += 1
+        # and echo back new encoded json
+        print_line(prefix+json.dumps(j))