Initial Python/Kivy Terminal Emulator (It's just a performance test. You can use this sample to write your own terminal emulator)

kivyconsole.py

from kivy.base import runTouchApp
from kivy.event import EventDispatcher
from kivy.lang import Builder
from kivy.properties import ObjectProperty, ListProperty, StringProperty, \
    NumericProperty, Clock, partial
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.textinput import TextInput
import os
import subprocess
import threading
from multiprocessing import Process
import shlex
import sys

Builder.load_string('''
<KivyConsole>:
    console_input: console_input
    scroll_view: scroll_view
    ScrollView:
        id: scroll_view
        ConsoleInput:
            id: console_input
            shell: root
            size_hint: (1, None)
            font_name: root.font_name
            font_size: root.font_size
            foreground_color: root.foreground_color
            background_color: root.background_color
            height: max(self.parent.height, self.minimum_height)
''')

def threaded(fn):
    def wrapper(*args, **kwargs):
        threading.Thread(target=fn, args=args, kwargs=kwargs).start()
    return wrapper


class Shell(EventDispatcher):
    # , 'on_stop', 'on_start', 'on_complete', 'on_error'
    __events__ = ('on_output', 'on_complete')

    process = ObjectProperty(None)
    '''subprocess process
    '''

    @threaded
    def run_command(self, command, show_output=True, *args):
        output = ''
        self.process = subprocess.Popen(command, stdout=subprocess.PIPE)
        lines_iterator = iter(self.process.stdout.readline, "")
        for line in lines_iterator:
            output += line
            if show_output:
                self.dispatch('on_output', line)
        self.dispatch('on_complete', output)

    @threaded
    def stop(self, *args):
        if self.process:
            self.process.kill()


class ConsoleInput(TextInput):
    '''Displays Output and sends input to Shell. Emits 'on_ready_to_input'
       when it is ready to get input from user.
    '''

    shell = ObjectProperty(None)
    '''Instance of KivyConsole(parent) widget
    '''


    def __init__(self, **kwargs):
        super(ConsoleInput, self).__init__(**kwargs)
        self._cursor_pos = 0  # position of the cursor before after prompt
        self.__init_console()

    def __init_console(self, *args):
        '''Create initial values for the prompt and shows it
        '''
        self.cur_dir = os.getcwd()
        self._hostname = 'kivy'
        try:
            if hasattr(os, 'uname'):
                self._hostname = os.uname()[1]
            else:
                self._hostname = os.environ.get('COMPUTERNAME', 'kivy')
        except Exception:
            pass
        self._username = os.environ.get('USER', '')
        if not self._username:
            self._username = os.environ.get('USERNAME', 'designer')
        self.prompt()

    def keyboard_on_key_down(self, window, keycode, text, modifiers):
        '''Override of _keyboard_on_key_down.
        '''
        if keycode[0] == 13:
            # Enter -> execute the command
            self.validate_cursor_pos()
            text = self.text[self._cursor_pos:]
            if text.strip():
                Clock.schedule_once(partial(self._run_cmd, text))
            else:
                Clock.schedule_once(self.prompt)
        elif keycode[0] in [8, 127]:
            self.cancel_selection()

        elif keycode[0] == 99 and modifiers == ['ctrl']:
            self.shell.stop()

        if self.cursor_index() < self._cursor_pos:
            return False

        return super(ConsoleInput, self).keyboard_on_key_down(
            window, keycode, text, modifiers)

    def _run_cmd(self, cmd, *args):
        _posix = True
        if sys.platform[0] == 'w':
            _posix = False

        commands = shlex.split(str(cmd), posix=_posix)
        self.shell.run_command(commands)


    def validate_cursor_pos(self, *args):
        if self.cursor_index() < self._cursor_pos:
            self.cursor = self.get_cursor_from_index(self._cursor_pos)

    def prompt(self, *args):
        '''Show the PS1 variable
        '''
        ps1 = "[%s@%s %s]> " % (
            self._username, self._hostname,
            os.path.basename(str(self.cur_dir)))
        self._cursor_pos = self.cursor_index() + len(ps1)
        self.text += ps1

    def on_output(self, output):
        self.text += output
        # print(output)

    def on_complete(self, output):
        self.prompt()

class KivyConsole(BoxLayout, Shell):

    console_input = ObjectProperty(None)
    '''Instance of ConsoleInput
       :data:`console_input` is an :class:`~kivy.properties.ObjectProperty`
    '''

    scroll_view = ObjectProperty(None)
    '''Instance of :class:`~kivy.uix.scrollview.ScrollView`
       :data:`scroll_view` is an :class:`~kivy.properties.ObjectProperty`
    '''

    foreground_color = ListProperty((1, 1, 1, 1))
    '''This defines the color of the text in the console

    :data:`foreground_color` is an :class:`~kivy.properties.ListProperty`,
    Default to '(.5, .5, .5, .93)'
    '''

    background_color = ListProperty((0, 0, 0, 1))
    '''This defines the color of the text in the console

    :data:`foreground_color` is an :class:`~kivy.properties.ListProperty`,
    Default to '(0, 0, 0, 1)'''

    font_name = StringProperty('data/fonts/DroidSansMono.ttf')
    '''Indicates the font Style used in the console

    :data:`font` is a :class:`~kivy.properties.StringProperty`,
    Default to 'DroidSansMono'
    '''

    font_size = NumericProperty(14)
    '''Indicates the size of the font used for the console

    :data:`font_size` is a :class:`~kivy.properties.NumericProperty`,
    Default to '9'
    '''

    def __init__(self, **kwargs):
        super(KivyConsole, self).__init__(**kwargs)
        # self.shell = Shell()
        # self.run_command = self.shell.run_command
        # self.shell.bind(on_output=self.console_input.on_output)
        # self.shell.bind(on_complete=self.console_input.on_output)

    def on_output(self, output):
        '''Event handler to send output data
        '''
        self.console_input.on_output(output)

    def on_complete(self, output):
        '''Event handler to send output data
        '''
        self.console_input.on_complete(output)

if __name__ == '__main__':
    runTouchApp(KivyConsole())