[Keymap] Add encoder showcase keymap (#16544)

keyboards/psuieee/pluto12/keymaps/wymcg/keymap.c

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+// Copyright 2021-22 Will McGLoughlin (wymcg)
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include QMK_KEYBOARD_H
+
+// Defines names for use in layer keycodes and the keymap
+enum layer_names {
+    _BASE,
+    _NAV,
+    _PROD
+};
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+  [_BASE] = LAYOUT(
+    KC_MUTE,    KC_MPRV,    KC_MPLY,    KC_MNXT,
+    TO(_NAV),   G(KC_1),    G(KC_2),    G(KC_3),
+    TO(_PROD),  G(KC_4),    G(KC_5),    G(KC_6)
+  ),
+  [_NAV] = LAYOUT(
+    TO(_BASE),  KC_HOME,    KC_UP,      KC_END,
+    A(KC_TAB),  KC_LEFT,    KC_DOWN,    KC_RIGHT,
+    G(KC_TAB),  KC_PGDN,    KC_PGUP,    MO(_BASE)
+  ),
+  [_PROD] = LAYOUT(
+    TO(_BASE),  KC_NO,      KC_NO,      KC_NO,
+    C(KC_Z),    C(KC_X),    C(KC_C),    C(KC_V),
+    C(KC_A),    C(KC_LEFT), C(KC_RIGHT),MO(_BASE)
+  )
+};
+
+bool encoder_update_user(uint8_t index, bool clockwise) {
+    switch (biton32(layer_state)) {
+        case _BASE:
+            if (clockwise) {
+                tap_code(KC_VOLU);
+            } else {
+                tap_code(KC_VOLD);
+            }
+            break;
+        case _NAV:
+            if (clockwise) {
+                tap_code16(C(G(KC_RIGHT)));
+            } else {
+                tap_code16(C(G(KC_LEFT)));
+            }
+            break;
+        case _PROD:
+            if (clockwise) {
+                tap_code16(C(KC_Y));
+            } else {
+                tap_code16(C(KC_Z));
+            }
+            break;
+    }
+    return false;
+}

keyboards/psuieee/pluto12/keymaps/wymcg/readme.md

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+# wymcg's custom keymap