kaylee/kayleevc/kaylee.py

# This is part of Kaylee
# -- this code is licensed GPLv3
# Copyright 2015-2017 Clayton G. Hobbs
# Portions Copyright 2013 Jezra

import importlib
import queue
import sys
import subprocess
import signal
import os.path
from gi.repository import GObject, GLib

from .recognizer import Recognizer
from .util import *
from .numbers import NumberParser
import kayleevc.plugins


class Kaylee:

    def __init__(self):
        self.ui = None
        self.options = {}
        self.continuous_listen = False

        # Load configuration
        self.config = Config()
        self.options = vars(self.config.options)

        # Make sure some plugins are configured to be loaded
        if self.config.plugins is None:
            print("error: no plugins configured", file=sys.stderr)
            sys.exit(1)

        # Load plugins
        self.plugins = []
        for plugin in self.config.plugins.keys():
            pmod = importlib.import_module(plugin, 'kayleevc.plugins')
            pobj = pmod.Plugin(self.config, plugin)
            self.plugins.append(pobj)

        # Create a hasher
        self.hasher = Hasher(self.config)

        # Create the strings file
        self.update_voice_commands_if_changed()

        if self.options['interface']:
            if self.options['interface'] == "g":
                from kayleevc.gui import GTKInterface as UI
            else:
                print("no GUI defined")
                sys.exit()

            self.ui = UI(self.options, self.options['continuous'])
            self.ui.connect("command", self.process_command)
            # Can we load the icon resource?
            icon = self.load_resource("icon_small.png")
            if icon:
                self.ui.set_icon_active_asset(icon)
            # Can we load the icon_inactive resource?
            icon_inactive = self.load_resource("icon_inactive_small.png")
            if icon_inactive:
                self.ui.set_icon_inactive_asset(icon_inactive)

        if self.options['history']:
            self.history = []

        # Update the language if necessary
        self.language_updater = LanguageUpdater(self.config)
        self.language_updater.update_language_if_changed()

        # Create the recognizer
        self.recognizer = Recognizer(self.config)

        # Connect the recognizer's finished signal to the appropriate method
        self.recognizer.connect('finished', self.recognizer_finished)

    def update_voice_commands_if_changed(self):
        """Use hashes to test if the voice commands have changed"""
        stored_hash = self.hasher['voice_commands']

        # Calculate the hash the voice commands have right now
        hasher = self.hasher.get_hash_object()
        for plugin in self.plugins:
            for string in sorted(plugin.corpus_strings):
                hasher.update(string.encode('utf-8'))
                # Add a separator to avoid odd behavior
                hasher.update('\n'.encode('utf-8'))
        new_hash = hasher.hexdigest()

        if new_hash != stored_hash:
            self.create_strings_file()
            self.hasher['voice_commands'] = new_hash
            self.hasher.store()

    def create_strings_file(self):
        # Open the strings file
        with open(self.config.strings_file, 'w') as strings:
            # Add command words to the corpus
            # FIXME: Doing this twice is a silly thing
            for plugin in self.plugins:
                for string in sorted(plugin.corpus_strings):
                    strings.write(string + "\n")
            # Add number words to the corpus
            if NumberParser.number_words is not None:
                for word in NumberParser.number_words:
                    strings.write(word + " ")
            strings.write("\n")

    def _log_history(self, plugin, text):
        """Log the recognized sentence to the history file"""
        if self.options['history']:
            self.history.append("{}: {}".format(plugin.name, text))
            if len(self.history) > self.options['history']:
                # Pop off the first item
                self.history.pop(0)

            # Open and truncate the history file
            with open(self.config.history_file, 'w') as hfile:
                for line in self.history:
                    hfile.write(line + '\n')
        self._stop_ui(text)

    def _valid_cmd(self):
        """Run the valid_sentence_command if it's set"""
        if self.options['valid_sentence_command']:
            subprocess.call(self.options['valid_sentence_command'], shell=True)

    def _invalid_cmd(self, text):
        """Run the invalid_sentence_command if it's set"""
        if self.options['invalid_sentence_command']:
            subprocess.call(self.options['invalid_sentence_command'],
                            shell=True)
        print("no matching command {0}".format(text))

    def recognizer_finished(self, recognizer, text):
        confidence_heap = queue.PriorityQueue()
        min_confidence = self.options['minimum_confidence']
        # Add handlers to the heap
        for index, plugin in enumerate(self.plugins):
            # Get a handler
            handler = plugin.get_handler(text)
            # If the handler meets minimum confidence
            if ((handler is not None)
                and ((min_confidence is None)
                     or (min_confidence is not None
                         and handler.confidence >= min_confidence))):
                # Add a triple to the heap, so handlers are sorted first by
                # their confidence, then by index to break ties
                confidence_heap.put_nowait((handler, index, plugin))

        # Run valid or invalid sentence command
        if confidence_heap.empty():
            self._invalid_cmd(text)
        else:
            self._valid_cmd()

        # Give the command to the handlers that want it
        while True:
            try:
                # Get information about the handler
                info = confidence_heap.get_nowait()
                handler = info[0]
                plugin = info[2]
                # Handle the command
                handler(self.plugin_tts)
                self._log_history(plugin, text)
                break
            except queue.Empty:
                break
                # If an unknown error occurs, ignore it and keep trying
                # FIXME not a good API decision

        self._stop_ui(text)

    def plugin_tts(self, text):
        # Stop listening
        self.recognizer.pause()
        # Speak
        try:
            subprocess.call(self.options['tts'] + [text])
        except KeyError:
            print('TTS:', text)
        # Resume listening
        self.recognizer.listen()

    def _stop_ui(self, text):
        # If there is a UI and we are not continuous listen
        if self.ui:
            if not self.continuous_listen:
                # Stop listening
                self.recognizer.pause()
            # Let the UI know that there is a finish
            self.ui.finished(text)

    def run(self):
        if self.ui:
            self.ui.run()
        else:
            self.recognizer.listen()

    def quit(self):
        sys.exit()

    def process_command(self, UI, command):
        print(command)
        if command == "listen":
            self.recognizer.listen()
        elif command == "stop":
            self.continuous_listen = False
            self.recognizer.pause()
        elif command == "continuous_listen":
            self.continuous_listen = True
            self.recognizer.listen()
        elif command == "quit":
            self.quit()

    def load_resource(self, string):
        # TODO: Use the Config object for this path management
        local_data = os.path.join(os.path.dirname(__file__), '..', 'data')
        paths = ["/usr/share/kaylee/", "/usr/local/share/kaylee", local_data]
        for path in paths:
            resource = os.path.join(path, string)
            if os.path.exists(resource):
                return resource
        # If we get this far, no resource was found
        return False


def run():
    # Make our kaylee object
    kaylee = Kaylee()
    # Init gobject threads
    GObject.threads_init()
    # We want a main loop
    main_loop = GObject.MainLoop()
    # Handle sigint
    signal.signal(signal.SIGINT, signal.SIG_DFL)
    # Run the kaylee
    kaylee.run()
    # Start the main loop
    try:
        main_loop.run()
    except:
        main_loop.quit()
        sys.exit()