qmk-dactyl-manuform-a/keyboards/atreus/keymaps/dvorak_42_key/keymap.c

#include QMK_KEYBOARD_H

// layers
#define BASE      0
#define KEYNAV    1
#define KEYSEL    2
#define COMBINED  3
#define BROWSER_CONTROL 4


enum custom_keycodes {
  PLACEHOLDER = SAFE_RANGE, // can always be here

  // Cloud9 macros
  CLOUD9_TAB_LEFT,
  CLOUD9_TAB_RIGHT,
  CLOUD9_TAB_CLOSE,
  CLOUD9_GOTO_SYMBOL,
  CLOUD9_GOTO_LINE,
  CLOUD9_NAVIGATE,

};

// building instructions:
// make atreus:dvorak_42_key

// flashing instructions:
// avrdude -p atmega32u4 -c avr109 -U flash:w:atreus_dvorak_42_key.hex  -P COM7

const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
  [BASE] = LAYOUT(
    KC_QUOTE,      KC_COMMA,      KC_DOT,     KC_P,                KC_Y,                                 KC_F,       KC_G,      KC_C,    KC_R,          KC_L,
    KC_A,          KC_O,          KC_E,       KC_U,                KC_I,                                 KC_D,       KC_H,      KC_T,    KC_N,          KC_S,
    KC_SCOLON,     KC_Q,          KC_J,       KC_K,                KC_X,                                 KC_B,       KC_M,      KC_W,    KC_V,          KC_Z,
    OSM(MOD_LSFT), OSM(MOD_LCTL), MO(KEYSEL), MO(BROWSER_CONTROL), MO(COMBINED), MO(KEYNAV), KC_ENTER,   KC_SPACE,  KC_BSPC, RCTL(KC_BSPC), KC_CAPSLOCK, OSM(MOD_LSFT)
  ),

  [KEYNAV] = LAYOUT(
    KC_ESC,      CLOUD9_GOTO_LINE,   RCTL(KC_Z),      RCTL(KC_S),       MEH(KC_F10),                         KC_TRNS,       KC_HOME,    KC_UP,           KC_END,     KC_PGUP,
    MEH(KC_F11), CLOUD9_GOTO_SYMBOL, RSFT(KC_TAB),    KC_TAB,           MEH(KC_A),                           LCTL(KC_LEFT), KC_LEFT,    KC_DOWN,         KC_RIGHT,   LCTL(KC_RIGHT),
    MEH(KC_B),   CLOUD9_NAVIGATE,    CLOUD9_TAB_LEFT, CLOUD9_TAB_RIGHT, CLOUD9_TAB_CLOSE,                    KC_TRNS,       RCTL(KC_C), RCTL(KC_X),      RCTL(KC_V), KC_PGDOWN,
    KC_TRNS,     KC_TRNS,            KC_TRNS,         KC_TRNS,          KC_TRNS,          KC_TRNS, KC_ENTER, KC_SPACE,      KC_BSPC,    RCTL(KC_BSPC),   KC_DELETE,  LCTL(KC_DELETE)
  ),

  [KEYSEL] = LAYOUT(
    MEH(KC_G), MEH(KC_H),MEH(KC_I), MEH(KC_J), MEH(KC_K),                    KC_TRNS,             RSFT(KC_HOME), RSFT(KC_UP),   RSFT(KC_END),   RSFT(KC_PGUP),
    MEH(KC_L), MEH(KC_M),MEH(KC_N), MEH(KC_O), MEH(KC_P),                    RSFT(RCTL(KC_LEFT)), RSFT(KC_LEFT), RSFT(KC_DOWN), RSFT(KC_RIGHT), RSFT(RCTL(KC_RIGHT)),
    MEH(KC_Q), MEH(KC_R),MEH(KC_S), MEH(KC_T), MEH(KC_U),                    KC_TRNS,             RCTL(KC_C),    RCTL(KC_X),    RCTL(KC_V),     RSFT(KC_PGDN),
    RESET,     KC_TRNS,  KC_TRNS,   KC_TRNS,   KC_TRNS,   KC_TRNS, KC_ENTER, KC_SPACE,            KC_BSPC,       RCTL(KC_BSPC), KC_DELETE,      LCTL(KC_DELETE)
  ),

  [COMBINED] = LAYOUT(
    KC_EXLM, KC_AT,   KC_HASH,     KC_DLR,      KC_PERC,                   KC_PLUS,  KC_7, KC_8,   KC_9,    KC_ASTR,
    KC_LPRN, KC_RPRN, KC_LBRACKET, KC_RBRACKET, KC_UNDS,                   KC_MINS,  KC_4, KC_5,   KC_6,    KC_SLSH,
    KC_COLN, KC_DQUO, KC_LCBR,     KC_RCBR,     KC_AMPR,                   KC_EQUAL, KC_1, KC_2,   KC_3,    KC_QUES,
    KC_TRNS, KC_TILD, KC_GRAVE,    KC_CIRC,     KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,  KC_0, KC_DOT, KC_PIPE, KC_BSLS
  ),

  [BROWSER_CONTROL] = LAYOUT(
    MEH(KC_0), KC_BTN3,   KC_MS_U,   KC_BTN1,   KC_BTN2,                      KC_UP,      KC_PGUP,            KC_PGDN,      KC_MS_WH_UP,   MEH(KC_9),
    MEH(KC_1), KC_MS_L,   KC_MS_D,   KC_MS_R,   MEH(KC_6),                    KC_DOWN,    RSFT(RCTL(KC_TAB)), RCTL(KC_TAB), KC_MS_WH_DOWN, LALT(KC_LEFT),
    MEH(KC_2), MEH(KC_3), MEH(KC_4), MEH(KC_5), MEH(KC_7),                    MEH(KC_8),  RCTL(KC_1),         RCTL(KC_9),   KC_F6,         KC_F5,
    KC_TRNS,   KC_TRNS,   KC_TRNS,   KC_TRNS,   KC_TRNS, KC_TRNS, RCTL(KC_W), RCTL(KC_T), RSFT(RCTL(KC_TAB)), KC_TRNS,      KC_TRNS,       KC_TRNS
  ),
};

const uint16_t PROGMEM fn_actions[] = {

};

bool process_record_user(uint16_t keycode, keyrecord_t *record) {
  if(record->event.pressed) {
    switch (keycode) {
		// Cloud9 macros
		case CLOUD9_TAB_LEFT:
            SEND_STRING(SS_LCTRL("["));
            return true;
			break;
		case CLOUD9_TAB_RIGHT:
            SEND_STRING(SS_LCTRL("]"));
            return true;
			break;
		case CLOUD9_TAB_CLOSE:
            SEND_STRING(SS_LALT("w"));
            return true;
			break;
		case CLOUD9_GOTO_SYMBOL:
            SEND_STRING(SS_LSFT(SS_LCTRL("e")));
            return true;
			break;
		case CLOUD9_GOTO_LINE:
            SEND_STRING(SS_LCTRL("g"));
            return true;
			break;
		case CLOUD9_NAVIGATE:
            SEND_STRING(SS_LCTRL("e"));
            return true;
			break;
	}
  }

  return true;
}