[Keymap] New custom 'super alt' keymap for the Drop ALT (#9385)

* New custom 'super alt' keymap for the Drop ALT

* Improvements to 'super alt' keymap based on PR feedback

* Fix flickering LED caps lock bug

* Code cleanup from PR feedback

* Minor keymap layout cleanup

1 files changed, 196 insertions, 0 deletions

diff --git a/keyboards/massdrop/alt/keymaps/ewersp/keymap.c b/keyboards/massdrop/alt/keymaps/ewersp/keymap.c
new file mode 100644
index 0000000000..483ea3cfb2
--- /dev/null
+++ b/keyboards/massdrop/alt/keymaps/ewersp/keymap.c
@@ -0,0 +1,196 @@
+#include QMK_KEYBOARD_H
+
+enum alt_keycodes {
+    U_T_AUTO = SAFE_RANGE, //USB Extra Port Toggle Auto Detect / Always Active
+    U_T_AGCR,              //USB Toggle Automatic GCR control
+    DBG_TOG,               //DEBUG Toggle On / Off
+    DBG_MTRX,              //DEBUG Toggle Matrix Prints
+    DBG_KBD,               //DEBUG Toggle Keyboard Prints
+    DBG_MOU,               //DEBUG Toggle Mouse Prints
+    MD_BOOT,               //Restart into bootloader after hold timeout
+    ALT_DEL,               //Added to map left alt + backspace to delete
+};
+
+// Friendly layer names
+enum alt_layers {
+    DEF = 0,
+    ALT,
+    FUNC,
+    SUPR
+};
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+    [DEF] = LAYOUT_65_ansi_blocker(
+        KC_ESC,  KC_1,    KC_2,    KC_3,    KC_4,    KC_5,    KC_6,    KC_7,    KC_8,    KC_9,    KC_0,    KC_MINS, KC_EQL,  KC_BSPC, KC_DEL,
+        KC_TAB,  KC_Q,    KC_W,    KC_E,    KC_R,    KC_T,    KC_Y,    KC_U,    KC_I,    KC_O,    KC_P,    KC_LBRC, KC_RBRC, KC_BSLS, KC_HOME,
+        KC_CAPS, KC_A,    KC_S,    KC_D,    KC_F,    KC_G,    KC_H,    KC_J,    KC_K,    KC_L,    KC_SCLN, KC_QUOT,          KC_ENT,  KC_PGUP,
+        KC_LSFT, KC_Z,    KC_X,    KC_C,    KC_V,    KC_B,    KC_N,    KC_M,    KC_COMM, KC_DOT,  KC_SLSH, KC_RSFT,          KC_UP,   KC_PGDN,
+        KC_LCTL, KC_LGUI, MO(SUPR),                           KC_SPC,                             KC_RALT, MO(FUNC),KC_LEFT, KC_DOWN, KC_RGHT
+    ),
+    [ALT] = LAYOUT_65_ansi_blocker(
+        _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,
+        _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,
+        _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,          _______, _______,
+        _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,          _______, _______,
+        _______, _______, KC_LALT,                            _______,                            _______, _______, _______, _______, _______
+    ),
+    [FUNC] = LAYOUT_65_ansi_blocker(
+        KC_GRV,  KC_F1,   KC_F2,   KC_F3,   KC_F4,   KC_F5,   KC_F6,   KC_F7,   KC_F8,   KC_F9,   KC_F10,  KC_F11,  KC_F12,  _______, KC_MUTE,
+        _______, RGB_SPD, RGB_VAI, RGB_SPI, RGB_HUI, RGB_SAI, _______, U_T_AUTO,U_T_AGCR,_______, KC_PSCR, KC_SLCK, KC_PAUS, _______, KC_END,
+        _______, RGB_RMOD,RGB_VAD, RGB_MOD, RGB_HUD, RGB_SAD, _______, _______, _______, _______, _______, _______,          _______, KC_VOLU,
+        _______, RGB_TOG, _______, _______, _______, MD_BOOT, NK_TOGG, DBG_TOG, _______, TG(ALT), _______, _______,          KC_PGUP, KC_VOLD,
+        _______, _______, KC_LALT,                            _______,                            _______, _______, KC_HOME, KC_PGDN, KC_END
+    ),
+    [SUPR] = LAYOUT_65_ansi_blocker(
+        KC_GRV,  KC_F1,   KC_F2,   KC_F3,   KC_F4,   KC_F5,   KC_F6,   KC_F7,   KC_F8,   KC_F9,   KC_F10,  KC_F11,  KC_F12,  ALT_DEL, _______,
+        _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, KC_END,
+        _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,          _______, _______,
+        _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,          _______, _______,
+        _______, _______, _______,                            _______,                            _______, _______, KC_HOME, _______, KC_END
+    )
+};
+
+// If the super alt layer is the active layer
+bool super_alt_layer_active = false;
+
+// If we need to unregister alt when leaving the super alt layer
+bool need_to_unregister_alt = false;
+
+#define MODS_SHIFT  (get_mods() & MOD_BIT(KC_LSHIFT) || get_mods() & MOD_BIT(KC_RSHIFT))
+#define MODS_CTRL  (get_mods() & MOD_BIT(KC_LCTL) || get_mods() & MOD_BIT(KC_RCTRL))
+#define MODS_ALT  (get_mods() & MOD_BIT(KC_LALT) || get_mods() & MOD_BIT(KC_RALT))
+
+// Taken from 'g_led_config' in config_led.c
+#define CAPS_LOCK_LED_ID 30
+
+// This runs every matrix scan (every 'frame')
+void rgb_matrix_indicators_user(void) {
+    led_flags_t flags = rgb_matrix_get_flags();
+
+    // If we're in either keylight or underglow modes (but not both simultaneously)
+    if (HAS_FLAGS(flags, LED_FLAG_KEYLIGHT) != HAS_FLAGS(flags, LED_FLAG_UNDERGLOW)) {
+
+        // This fixes a bug where the caps lock LED flickers when toggled in either keylight or underglow modes
+        if (host_keyboard_leds() & (1 << USB_LED_CAPS_LOCK)) {
+            rgb_matrix_set_color(CAPS_LOCK_LED_ID, RGB_WHITE);
+        } else {
+            rgb_matrix_set_color(CAPS_LOCK_LED_ID, 0, 0, 0);
+        }
+    }
+}
+
+// This runs code every time that the layers get changed
+layer_state_t layer_state_set_user(layer_state_t state) {
+    switch (get_highest_layer(state)) {
+        case DEF:
+            // When returning to the default layer, check if we need to unregister the left alt key
+            if (super_alt_layer_active && need_to_unregister_alt) {
+                unregister_code(KC_LALT);
+            }
+
+            super_alt_layer_active = false;
+            need_to_unregister_alt = false;
+            break;
+        case SUPR:
+            super_alt_layer_active = true;
+            break;
+    }
+    return state;
+}
+
+bool process_record_user(uint16_t keycode, keyrecord_t *record) {
+    static uint32_t key_timer;
+
+    switch (keycode) {
+        // These are the keys we want to 'fall though' and behave as usual when pressed with the alt modifier
+        case KC_A ... KC_Z:
+        case KC_TAB:
+        case KC_DEL:
+        case KC_UP:
+        case KC_DOWN:
+        case MO(FUNC):
+            if (super_alt_layer_active && record->event.pressed) {
+                // Only activate the alt modifier for the first key press
+                if ((get_mods() & MOD_BIT(KC_LALT)) == false) {
+                    register_code(KC_LALT);
+                    need_to_unregister_alt = true;
+                }
+            }
+            // We still want to process the keycode normally
+            return true;
+        case ALT_DEL:
+            if (record->event.pressed) {
+                register_code(KC_DEL);
+            } else {
+                unregister_code(KC_DEL);
+            }
+            return false;
+        case U_T_AUTO:
+            if (record->event.pressed && MODS_SHIFT && MODS_CTRL) {
+                TOGGLE_FLAG_AND_PRINT(usb_extra_manual, "USB extra port manual mode");
+            }
+            return false;
+        case U_T_AGCR:
+            if (record->event.pressed && MODS_SHIFT && MODS_CTRL) {
+                TOGGLE_FLAG_AND_PRINT(usb_gcr_auto, "USB GCR auto mode");
+            }
+            return false;
+        case DBG_TOG:
+            if (record->event.pressed) {
+                TOGGLE_FLAG_AND_PRINT(debug_enable, "Debug mode");
+            }
+            return false;
+        case DBG_MTRX:
+            if (record->event.pressed) {
+                TOGGLE_FLAG_AND_PRINT(debug_matrix, "Debug matrix");
+            }
+            return false;
+        case DBG_KBD:
+            if (record->event.pressed) {
+                TOGGLE_FLAG_AND_PRINT(debug_keyboard, "Debug keyboard");
+            }
+            return false;
+        case DBG_MOU:
+            if (record->event.pressed) {
+                TOGGLE_FLAG_AND_PRINT(debug_mouse, "Debug mouse");
+            }
+            return false;
+        case MD_BOOT:
+            if (record->event.pressed) {
+                key_timer = timer_read32();
+            } else {
+                if (timer_elapsed32(key_timer) >= 500) {
+                    reset_keyboard();
+                }
+            }
+            return false;
+        case RGB_TOG:
+            if (record->event.pressed) {
+              switch (rgb_matrix_get_flags()) {
+                case LED_FLAG_ALL: {
+                    rgb_matrix_set_flags(LED_FLAG_KEYLIGHT);
+                    rgb_matrix_set_color_all(0, 0, 0);
+                  }
+                  break;
+                case LED_FLAG_KEYLIGHT: {
+                    rgb_matrix_set_flags(LED_FLAG_UNDERGLOW);
+                    rgb_matrix_set_color_all(0, 0, 0);
+                  }
+                  break;
+                case LED_FLAG_UNDERGLOW: {
+                    rgb_matrix_set_flags(LED_FLAG_NONE);
+                    rgb_matrix_disable_noeeprom();
+                  }
+                  break;
+                default: {
+                    rgb_matrix_set_flags(LED_FLAG_ALL);
+                    rgb_matrix_enable_noeeprom();
+                  }
+                  break;
+              }
+            }
+            return false;
+        default:
+            return true; // Process all other keycodes normally
+    }
+}