store_or_get_action - cache keycode on key press, return cached keycode on key release (#25349)

Co-authored-by: Nick Brassel <nick@tzarc.org>

quantum/keycode_cache/keycode_cache_mock.c

@@ -0,0 +1,85 @@
+/* Copyright 2025 Garretonzo
+ *
+ * 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, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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 "keycode_cache_mock.h"
+#include "quantum/action.h"
+#include "quantum/quantum_keycodes.h"
+
+// Mock keymap storage
+static uint16_t mock_keymap[4][4] = {{KC_NO}};
+
+// Mock functions needed for testing
+uint16_t keymap_key_to_keycode(uint8_t layer, keypos_t key) {
+    if (layer < 4 && key.row < 4 && key.col < 4) {
+        return mock_keymap[key.row][key.col];
+    }
+    return KC_NO;
+}
+
+void dynamic_keymap_set_keycode(uint8_t layer, uint8_t row, uint8_t column, uint16_t keycode) {
+    if (layer < 4 && row < 4 && column < 4) {
+        mock_keymap[row][column] = keycode;
+    }
+}
+
+uint16_t dynamic_keymap_get_keycode(uint8_t layer, uint8_t row, uint8_t column) {
+    if (layer < 4 && row < 4 && column < 4) {
+        return mock_keymap[row][column];
+    }
+    return KC_NO;
+}
+
+action_t action_for_keycode(uint16_t keycode) {
+    action_t action;
+    action.code = keycode;
+    return action;
+}
+
+action_t action_for_key(uint8_t layer, keypos_t key) {
+    uint16_t keycode = keymap_key_to_keycode(layer, key);
+    return action_for_keycode(keycode);
+}
+
+// Utilities for debug
+uint8_t biton(uint8_t bits) {
+    for (uint8_t i = 0; i < 8; i++) {
+        if (bits & (1 << i)) return i;
+    }
+    return 0;
+}
+
+uint8_t biton16(uint16_t bits) {
+    for (uint8_t i = 0; i < 16; i++) {
+        if (bits & (1 << i)) return i;
+    }
+    return 0;
+}
+
+uint8_t biton32(uint32_t bits) {
+    for (uint8_t i = 0; i < 32; i++) {
+        if (bits & (1UL << i)) return i;
+    }
+    return 0;
+}
+
+// Keyboard functions
+void clear_keyboard_but_mods(void) {
+    // No-op for tests
+}
+
+void clear_keyboard_but_mods_and_keys(void) {
+    // No-op for tests
+}