Count number of characters without HTML tags on CotEditor

Count Characters without Tags.py

#!/usr/bin/env python

"""Count Characters w/o Tags for CotEditor

Count number of characters without HTML tags on CotEditor
and display it in an alert window.
This is a CotEditor script.

%%%{CotEditorXInput=Selection}%%%
"""

__version__ = '1.1'
__date__ = '2013-04-26'
__author__ = '1024jp <http://wolfrosch.com/>'
__license__ = 'Creative Commons Attribution-NonCommercial 3.0 Unported License'


import re
import sys
from subprocess import Popen, PIPE

# main --------------------------------------------------------------

def run_osascript(script):
    """Run osascript."""
    p = Popen(['osascript', '-'], stdin=PIPE, stdout=PIPE)
    stdout, stderr = p.communicate(script)

    return stdout.rstrip()


def display(text, title=None, app='CotEditor'):
    """Display dialog."""
    text = text.replace('"', '\\"')
    script = 'tell application "{}" to display dialog "{}"'.format(app, text)
    script += ' with icon note buttons {{"OK"}} default button 1'
    if title:
        script += ' with title "' + title + '"'

    run_osascript(script)


def count_chars(text):
    """Return number of charactors without tags."""
    text = re.sub('[\n\t]', '', text)
    text = re.sub(' +', ' ', text)
    text = re.sub('<(head|script|style)[ >].+</\\1>', '', text)
    text = re.sub('<[^>]+>', '', text)
    return len(unicode(text, 'utf-8'))


if __name__ == "__main__":
    text = sys.stdin.read()
    length = count_chars(text)
    display(str(length) + ' characters', 'Number of Characters without Tags')