def evar_changed(self,*args):

        self.subexpr.expr = self.evar.get()

class Subterm:

    """one Submaster and its Subexpr"""

    def __init__(self, submaster, subexpr):

        make_attributes_from_args('submaster', 'subexpr')

    def scaled(self, t):

        subexpr_eval = self.subexpr.eval(t)

        # we prevent any exceptions from escaping, since they cause us to

        # stop sending levels

        try:

            if isinstance(subexpr_eval, Submaster.Submaster):

                # if the expression returns a submaster, just return it

                return subexpr_eval

            else:

                # otherwise, return our submaster multiplied by the value 

                # returned

                return self.submaster * subexpr_eval

        except Exception, e:

            dispatcher.send("expr_error", sender=self.subexpr, exc=str(e))

            return Submaster.Submaster('Error: %s' % str(e), temporary=True)

class Subtermview(tk.Frame):

        self.subterm = st

        tk.Frame.__init__(self,master,bd=1,relief='raised',**kw)

        l.pack(side='left')

        sev=Subexprview(self,self.subterm.subexpr)

        sev.pack(side='left',fill='both',exp=1)

class Output:

    lastsendtime=0

    lastsendlevs=None

    def __init__(self,subterms,music):

        make_attributes_from_args('subterms','music')

        self.recent_t=[]

        self.later = None

        self.update()

    def update(self):

        d = music.current_time()

        d.addCallback(self.update2)

        d.addErrback(self.updateerr)

    def updateerr(self,e):

        print e.getTraceback()

        dispatcher.send("update status",val=e.getErrorMessage())

        ('update period',lambda t: "%.1fms"%(t*1000)),

        ('update status',lambda t: str(t)),

        ]:

        l = tk.Label(master,anchor='w',justify='left')

        l.pack(side='top',fill='x')

        dispatcher.connect(lambda val,l=l,sn=signame,tf=textfilter:

                           l.config(text=sn+": "+tf(val)),

                           signame,weak=0)

class SubtermSetView(tk.Frame):

    def __init__(self, master, *args, **kw):

        tk.Frame.__init__(self, master, *args, **kw)

        self.cur_row = 0

        self.cur_col = 0

        self.ncols = 2

    def add_subtermview(self, stv):

        stv.grid(row=self.cur_row, column=self.cur_col, sticky='news')

        self.columnconfigure(self.cur_col, weight=1)

        self.cur_col += 1

        self.cur_col %= self.ncols

        if self.cur_col == 0:

            self.cur_row += 1

    if expr is None:

        expr = '%s(t)' % subname

    subterms.append(term)

    # stv.pack(side='top',fill='x')

    ssv.add_subtermview(stv)

    return term

def sub_commands_tk(master, curveset, subterms, root, ssv, graph):

    f=tk.Frame(master,relief='raised',bd=1)

    newname = tk.StringVar()

    def add_cmd():

        newname.set('')

    def reload_subs():

        dispatcher.send('reload all subs')

    tk.Button(f, text="reload subs (C-r)", 

        command=reload_subs).pack(side='left')

    tk.Label(f, text="new subterm named:").pack(side='left')

    entry = tk.Entry(f, textvariable=newname)

    entry.pack(side='left', fill='x', exp=1)

    entry.bind("<Key-Return>", lambda evt: add_cmd())

    return f

def savesubterms(filename,subterms):

    raise NotImplementedError

    s=""

    for st in subterms:

        s=s+"%s %s\n" % (st.submaster.name, st.subexpr.expr)

    file(filename,'w').write(s)

def createSubtermGraph(song, subterms):

    """rdf graph describing the subterms, readable by add_subterms_for_song"""

    graph = Graph()

    for subterm in subterms:

        uri = URIRef(song + "/subterm/" + subterm.submaster.name)

        graph.add((song, L9['subterm'], uri))

        graph.add((uri, RDF.type, L9['Subterm']))

        graph.add((uri, L9['sub'], L9['sub/%s' % subterm.submaster.name]))

        graph.add((uri, L9['expression'], Literal(subterm.subexpr.expr)))

    return graph

def add_subterms_for_song(graph, song, curveset, subterms, root, ssv):

    for st in graph.objects(song, L9['subterm']):

        add_one_subterm(graph, graph.value(st, L9['sub']), curveset, subterms,

                        root, ssv, graph.value(st, L9['expression']))

def graphPathForSubterms(song):

    return showconfig.subtermsForSong(showconfig.songFilenameFromURI(song)) + ".n3"

#######################################################################

root=tk.Tk()

root.tk_setPalette("gray50")

toplevelat("curvecalc",root)

root.tk_focusFollowsMouse()

parser = optparse.OptionParser()

options,args = parser.parse_args()

try:

    song = URIRef(args[0])

except IndexError:

    raise SystemExit("song name is required, e.g. '05-mix'")

log.debug("music")

music=Music()

zc = Zoomcontrol(root)

zc.pack(side='top',fill='x')

curveset = Curveset()

csv = Curvesetview(root,curveset)

csv.pack(side='top',fill='both',exp=1)

ssv = SubtermSetView(root)

ssv.pack(side='top', fill='x')

root.title("Curvemaster 3000MX - %s" % graph.label(song))

musicfilename = showconfig.songOnDisk(song)

maxtime = wavelength(musicfilename)

dispatcher.send("max time",maxtime=maxtime)

dispatcher.connect(lambda: maxtime, "get max time",weak=0)

subterms = []

sub_commands_tk(root, curveset, subterms, root, ssv, graph).pack(side='top',fill='x')

try:

except OSError, e:

    print e

log.debug("output")

out = Output(subterms, music)

def savekey(*args):

    print "saving",song

    g = createSubtermGraph(song, subterms)

    g.serialize(graphPathForSubterms(song), format="nt")

    curveset.save(basename=os.path.join(showconfig.curvesDir(), showconfig.songFilenameFromURI(song)))

    print "saved"

root.bind("<Control-Key-s>",savekey)

root.bind("<Control-Key-r>", lambda evt: dispatcher.send('reload all subs'))

create_status_lines(root)

for helpline in ["Bindings: C-s save subterms;  Esc see current time; S-Esc see curtime to end; Mousewheel zoom; C-p play/pause music at mouse",

                 "Curve point bindings: B1 drag point; C-B1 curve add point; S-B1 sketch points; Del selected points; 1..5 add point at time; Alt-Shift-B1 drag select points",

                 "Available in functions: nsin/ncos period=amp=1; within(a,b) bef(x) aft(x) compare to time; smoove(x) cubic smoothstep; curvename(t) eval curve"]:

    tk.Label(root,text=helpline, font="Helvetica -12 italic",

             anchor='w').pack(side='top',fill='x')

        (see showconfig.subFile)

        passing name alone makes a new empty sub

        temporary means the sub won't get saved or loaded

        pass:

          name, temporary=True  -  no rdf involved

          sub, filename         -  read sub URI from graph at filename

          name - new sub

          sub - n

          name, sub - new 

        """

        if name is sub is leveldict is None:

            raise TypeError("more args are needed")

        if sub is not None:

            name = graph.label(sub)

        if graph is not None:

            # old code was passing leveldict as second positional arg

            assert isinstance(graph, Graph)

        self.name = name

        self.temporary = temporary

        if leveldict:

            self.levels = leveldict

        else:

            self.levels = {}

        if not self.temporary:

            dispatcher.connect(self.reload, 'reload all subs')

        if self.temporary:

            return

        try:

            oldlevels = self.levels.copy()

            self.levels.clear()

            patchGraph = showconfig.getGraph()

            graph = Graph()

            graph.parse(showconfig.subFile(self.name), format="nt")

            subUri = L9['sub/%s' % self.name]

            for lev in graph.objects(subUri, L9['lightLevel']):

                chan = graph.value(lev, L9['channel'])

                val = graph.value(lev, L9['level'])

                name = patchGraph.label(chan)

                self.levels[name] = float(val)

            if (not quiet) and (oldlevels != self.levels):

                print "sub %s changed" % self.name

    def save(self):

        if self.temporary:

            print "not saving temporary sub named",self.name

            return

        graph = Graph()

        subUri = L9['sub/%s' % self.name]

        graph.add((subUri, RDFS.label, Literal(self.name)))

        for chan in self.levels.keys():

            try:

                chanUri = Patch.get_channel_uri(chan)

            except KeyError:

                print "saving dmx channels with no :Channel node is not supported yet. Give channel %s a URI for it to be saved. Omitting this channel from the sub." % chan

                continue

            lev = BNode()

            graph.add((subUri, L9['lightLevel'], lev))

            graph.add((lev, L9['channel'], chanUri))

            graph.add((lev, L9['level'],

                       Literal(self.levels[chan], datatype=XSD['decimal'])))

        graph.serialize(showconfig.subFile(self.name), format="nt")

    def set_level(self, channelname, level, save=True):

        self.levels[Patch.resolve_name(channelname)] = level