# Keystrokes/Syster/Syster.ino
``` c++
,/* -*- mode: c++ -*-
 * Kaleidoscope-Syster -- Symbolic input system
 * Copyright (C) 2017, 2018  Keyboard.io, Inc
 *
 * This program is free software: you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free Software
 * Foundation, version 3.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program. If not, see <http://www.gnu.org/licenses/>.
 */

#include <Kaleidoscope.h>
#include <Kaleidoscope-EEPROM-Settings.h>
#include <Kaleidoscope-HostOS.h>
#include <Kaleidoscope-Syster.h>
#include <Kaleidoscope-Unicode.h>

// clang-format off
KEYMAPS(
  [0] = KEYMAP_STACKED
  (
    Key_NoKey,    Key_1, Key_2, Key_3, Key_4, Key_5, Key_NoKey,
    Key_Backtick, Key_Q, Key_W, Key_E, Key_R, Key_T, Key_Tab,
    Key_PageUp,   Key_A, Key_S, Key_D, Key_F, Key_G,
    Key_PageDown, Key_Z, Key_X, Key_C, Key_V, Key_B, Key_Escape,

    Key_LeftControl, Key_Backspace, Key_LeftGui, Key_LeftShift,
    SYSTER,

    Key_skip,  Key_6, Key_7, Key_8,     Key_9,      Key_0,         Key_skip,
    Key_Enter, Key_Y, Key_U, Key_I,     Key_O,      Key_P,         Key_Equals,
               Key_H, Key_J, Key_K,     Key_L,      Key_Semicolon, Key_Quote,
    Key_skip,  Key_N, Key_M, Key_Comma, Key_Period, Key_Slash,     Key_Minus,

    Key_RightShift, Key_RightAlt, Key_Spacebar, Key_RightControl,
    SYSTER),
)
// clang-format on

void systerAction(kaleidoscope::plugin::Syster::action_t action, const char *symbol) {
  switch (action) {
  case kaleidoscope::plugin::Syster::StartAction:
    Unicode.type(0x2328);
    break;
  case kaleidoscope::plugin::Syster::EndAction:
    kaleidoscope::eraseChars(1);
    break;
  case kaleidoscope::plugin::Syster::SymbolAction:
    Kaleidoscope.serialPort().print("systerAction: symbol=");
    Kaleidoscope.serialPort().println(symbol);
    if (strcmp(symbol, "coffee") == 0) {
      Unicode.type(0x2615);
    }
    break;
  }
}

KALEIDOSCOPE_INIT_PLUGINS(EEPROMSettings,
                          HostOS,
                          Unicode,
                          Syster);

void setup() {
  Kaleidoscope.setup();
}

void loop() {
  Kaleidoscope.loop();
}

```