WeeChat script to run private messages through a text to speech program, though theoretically other uses are possible

msgsay.py

import weechat

hist = {}
histlen = 32

# [head, ..., tail]
queue = []
def enqueue(msg):
    global queue
    if msg is None:
        return
    queue[:0] = [msg]
def dequeue():
    global queue
    if len(queue) == 0:
        return None
    queue, s = queue[:-1], queue[-1:]
    return s[0]

def log(msg):
    weechat.prnt('', 'MSGSAY:' + msg)

def hist_record(bufname, msg):
    if not bufname in hist:
        hist[bufname] = []
    bhist = hist[bufname]
    bhist[:0] = [msg]
    if len(bhist) > histlen:
        bhist = bhist[:histlen]

def sieve(bufname, displayed, highlight, msg):
    curname = weechat.buffer_get_string(weechat.current_buffer(), 'name')
    if not int(displayed):
        return None
    if int(highlight):
        return msg
    if curname == bufname:
        return msg
    return None

speaking = False

def escape(msg):
    for c in '\\\"':
        msg = msg.replace(c, '\\'+c)
    return '"' + msg + '"'
def send(msg):
    if msg is None:
        return
    cmd = 'espeak '+escape(msg)
    #weechat.prnt('', cmd)
    weechat.hook_process(cmd, 0, 'send_cb', '')

def tryqueue():
    global speaking
    if speaking:
        return
    msg = dequeue()
    weechat.prnt('', str(msg))
    if msg is None:
        return
    weechat.prnt('', '    saying')
    speaking = True
    send(msg)

def send_cb(data, cmd, ret, out, err):
    global speaking
    speaking = False
    tryqueue()
    return weechat.WEECHAT_RC_OK

def on_privmsg(data, buf, date, tags, displayed, highlight, prefix, msg):
    bufname = weechat.buffer_get_string(buf, 'name')
    enqueue(sieve(bufname, displayed, highlight, msg))
    tryqueue()
    hist_record(bufname, msg)
    return weechat.WEECHAT_RC_OK

weechat.register('msgsay', 'Alex Iadicicco', '1.0', 'MIT',
            'Run messages through a command', '', '')
weechat.hook_print('', 'irc_privmsg', '', 1, 'on_privmsg', '')