"New" Atreus Keymap (#1717)

* Merge with upstream

* Finish merge

* Add new keymap

* Change use of KEYMAP macro

* Add Readme.md

* Fix link

* Clean up comments

* Raise on leading edge of keypress

keyboards/atreus/keymaps/henxing/Readme.md

@@ -0,0 +1,6 @@
+# Hugh's Atreus Keymap
+
+This keymap is the same as the [default](../default) layout for the Atreus, but
+uses the programming style found in the Let's
+Split [default](../../../lets_split/keymaps/default) keymap. See
+[`keymap.c`](keymap.c) for the layout.

keyboards/atreus/keymaps/henxing/keymap.c

@@ -0,0 +1,105 @@
+#include "atreus.h"
+#include "action_layer.h"
+#include "eeconfig.h"
+
+extern keymap_config_t keymap_config;
+
+// Each layer gets a name for readability, which is then used in the keymap matrix below.
+// The underscores don't mean anything - you can have a layer called STUFF or any other name.
+// Layer names don't all need to be of the same length, obviously, and you can also skip them
+// entirely and just use numbers.
+#define _QWERTY 0
+#define _LOWER  1
+#define _RAISE  2
+
+enum custom_keycodes {
+    QWERTY = SAFE_RANGE,
+    LOWER,
+    RAISE
+};
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+
+    /*
+     *  q   w   e    r    t        ||       y     u    i  o   p
+     *  a   s   d    f    g        ||       h     j    k  l   ;
+     *  z   x   c    v    b        ||       n     m    ,  .   /
+     * esc tab gui shift bksp ctrl || alt space lower  -  ' enter
+     */
+    [_QWERTY] = KEYMAP( \
+            KC_Q,   KC_W,   KC_E,    KC_R,    KC_T,                      KC_Y,   KC_U,  KC_I,    KC_O,    KC_P,    \
+            KC_A,   KC_S,   KC_D,    KC_F,    KC_G,                      KC_H,   KC_J,  KC_K,    KC_L,    KC_SCLN, \
+            KC_Z,   KC_X,   KC_C,    KC_V,    KC_B,                      KC_N,   KC_M,  KC_COMM, KC_DOT,  KC_SLSH, \
+            KC_ESC, KC_TAB, KC_LGUI, KC_LSFT, KC_BSPC, KC_LCTL, KC_LALT, KC_SPC, LOWER, KC_MINS, KC_QUOT, KC_ENT   \
+            ),
+
+    /*
+     *  !       @     up     {    }        ||     pgup    7     8     9    *
+     *  #     left   down  right  $        ||     pgdn    4     5     6    +
+     *  [       ]      (     )    &        ||       `     1     2     3    \
+     * raise  insert  gui  shift bksp ctrl || alt space  ____   .     0    =
+     */
+    [_LOWER] = KEYMAP( \
+            KC_EXLM, KC_AT,   KC_UP,   KC_LCBR, KC_RCBR,                   KC_PGUP, KC_7,    KC_8,   KC_9, KC_ASTR, \
+            KC_HASH, KC_LEFT, KC_DOWN, KC_RGHT, KC_DEL,                    KC_PGDN, KC_4,    KC_5,   KC_6, KC_PLUS, \
+            KC_LBRC, KC_RBRC, KC_LPRN, KC_RPRN, KC_AMPR,                   KC_GRV,  KC_1,    KC_2,   KC_3, KC_BSLS, \
+            RAISE,   KC_INS,  KC_LGUI, KC_LSFT, KC_BSPC, KC_LCTL, KC_LALT, KC_SPC,  KC_TRNS, KC_DOT, KC_0, KC_EQL   \
+            ),
+
+    /*
+     * insert home   up   end  pgup       ||      up      F7    F8     F9    F10
+     *  del   left  down right pgdn       ||     down     F4    F5     F6    F11
+     *       volup             reset      ||              F1    F2     F3    F12
+     *       voldn super shift bksp  ctrl || alt space QWERTY  prtsc scroll pause
+     */
+    [_RAISE] = KEYMAP( \
+            KC_INS,  KC_HOME, KC_UP,   KC_END,  KC_PGUP,                   KC_UP,   KC_F7,  KC_F8,   KC_F9,   KC_F10, \
+            KC_DEL,  KC_LEFT, KC_DOWN, KC_RGHT, KC_PGDN,                   KC_DOWN, KC_F4,  KC_F5,   KC_F6,   KC_F11, \
+            KC_TRNS, KC_VOLU, KC_TRNS, KC_TRNS, RESET,                     KC_TRNS, KC_F1,  KC_F2,   KC_F3,   KC_F12, \
+            KC_NO,   KC_VOLD, KC_LGUI, KC_LSFT, KC_BSPC, KC_LCTL, KC_LALT, KC_SPC,  QWERTY, KC_PSCR, KC_SLCK, KC_PAUS \
+            )
+
+};
+
+void persistent_default_layer_set(uint16_t default_layer) {
+    eeconfig_update_default_layer(default_layer);
+    default_layer_set(default_layer);
+}
+
+bool process_record_user(uint16_t keycode, keyrecord_t *record) {
+
+    // The value to return
+    bool return_value = false;
+
+    switch (keycode) {
+        case QWERTY:
+            if (record->event.pressed) {
+                persistent_default_layer_set(1UL<<_QWERTY);
+            }
+            break;
+
+        case LOWER:
+            // Toggle LOWER layer on when key pressed and off when released
+            if (record->event.pressed) {
+                layer_on(_LOWER);
+            } else {
+                layer_off(_LOWER);
+            }
+            break;
+
+        case RAISE:
+            if (record->event.pressed) {
+                persistent_default_layer_set(1UL<<_RAISE);
+            }
+            break;
+
+        default:
+
+            // If the keycode is not handled by any of the other cases, the
+            // function should return true
+            return_value = true;
+            break;
+    }
+
+    return return_value;
+}