Add Super Alt-Tab macro example as module (#24970)

* Add Super Alt-Tab macro example as module

* Make module more configurable

* remove unneeded comments

Co-authored-by: jack <jack@pngu.org>

* Update modules/qmk/super_alt_tab/super_alt_tab.c

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

---------

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

modules/qmk/super_alt_tab/qmk_module.json

@@ -0,0 +1,10 @@
+{
+    "module_name": "Super Alt Tab",
+    "maintainer": "QMK Maintainers",
+    "keycodes": [
+        {
+            "key": "COMMUNITY_MODULE_SUPER_ALT_TAB",
+            "aliases": ["CM_S_AT"]
+        }
+    ]
+}

modules/qmk/super_alt_tab/super_alt_tab.c

@@ -0,0 +1,50 @@
+// Copyright 2025 Christopher Courtney, aka Drashna Jael're  (@drashna)
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include QMK_KEYBOARD_H
+
+ASSERT_COMMUNITY_MODULES_MIN_API_VERSION(1, 0, 0);
+
+static bool     is_alt_tab_active = false;
+static uint16_t alt_tab_timer     = 0;
+
+#ifndef COMMUNITY_MODULE_SUPER_ALT_TAB_TIMEOUT
+#    define COMMUNITY_MODULE_SUPER_ALT_TAB_TIMEOUT 1000
+#endif // COMMUNITY_MODULE_SUPER_ALT_TAB_TIMEOUT
+#ifndef COMMUNITY_MODULE_SUPER_ALT_TAB_MODIFIER
+#    define COMMUNITY_MODULE_SUPER_ALT_TAB_MODIFIER MOD_LALT
+#endif // COMMUNITY_MODULE_SUPER_ALT_TAB_MODIFIER
+#ifndef COMMUNITY_MODULE_SUPER_ALT_TAB_KEY
+#    define COMMUNITY_MODULE_SUPER_ALT_TAB_KEY KC_TAB
+#endif // COMMUNITY_MODULE_SUPER_ALT_TAB_KEY
+
+bool process_record_super_alt_tab(uint16_t keycode, keyrecord_t *record) {
+    if (!process_record_super_alt_tab_kb(keycode, record)) {
+        return false;
+    }
+
+    switch (keycode) { // This will do most of the grunt work with the keycodes.
+        case COMMUNITY_MODULE_SUPER_ALT_TAB:
+            if (record->event.pressed) {
+                if (!is_alt_tab_active) {
+                    is_alt_tab_active = true;
+                    register_mods(COMMUNITY_MODULE_SUPER_ALT_TAB_MODIFIER);
+                }
+                alt_tab_timer = timer_read();
+                register_code(COMMUNITY_MODULE_SUPER_ALT_TAB_KEY);
+            } else {
+                unregister_code(COMMUNITY_MODULE_SUPER_ALT_TAB_KEY);
+            }
+            break;
+    }
+    return true;
+}
+
+void housekeeping_task_super_alt_tab(void) {
+    if (is_alt_tab_active) {
+        if (timer_elapsed(alt_tab_timer) > COMMUNITY_MODULE_SUPER_ALT_TAB_TIMEOUT) {
+            unregister_mods(COMMUNITY_MODULE_SUPER_ALT_TAB_MODIFIER);
+            is_alt_tab_active = false;
+        }
+    }
+}