Swap CMD and CTRL on home row mods when on linux/windows

rhruiz · May 27, 2024 · d7fe7f0 · d7fe7f0
1 parent 1d3d4cf
commit d7fe7f0
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Showing 3 changed files with 52 additions and 1 deletion.
diff --git a/users/rhruiz/layouts/keys.h b/users/rhruiz/layouts/keys.h
@@ -40,7 +40,9 @@ typedef enum custom_keycodes {
     NV_SCSH, // screenshot
     NV_WSCH, // window screenshot
     NV_WSWT, // window switcher key
-    NV_END = NV_WSWT,
+    NV_1MOD, // main modifier (cmd on mac, ctrl on linux/windows)
+    NV_2MOD, // ctrl on mac, gui on linux/windows
+    NV_END = NV_2MOD,
     USER_SAFE_RANGE
 } rhruiz_keycodes;
 

diff --git a/users/rhruiz/nav_keys.c b/users/rhruiz/nav_keys.c
@@ -22,8 +22,14 @@ const uint16_t nav_keys[][NUM_NAV_KEYS_OSES] PROGMEM = {
     [NV_SCSH - NV_START] = {SCMD(KC_3), KC_PSCR},
     [NV_WSCH - NV_START] = {SCMD(KC_4), SGUI(KC_S)},
     [NV_WSWT - NV_START] = {KC_LGUI, KC_LALT},
+    [NV_1MOD - NV_START] = {KC_LGUI, KC_LCTL},
+    [NV_2MOD - NV_START] = {KC_LCTL, KC_LGUI},
 };
 
+#ifdef HOME_ROW_MODS
+const uint16_t os_enabled_homerowmods[2] PROGMEM = { NV_2MOD, NV_1MOD };
+#endif
+
 uint16_t get_nav_code(uint16_t keycode) {
     return pgm_read_word(&(nav_keys[keycode - NV_START][nav_keys_index()]));
 }
@@ -79,6 +85,34 @@ layer_state_t default_layer_state_set_user_nav(layer_state_t state) {
     return state;
 }
 
+bool process_record_os_enabled_homerowmod(uint16_t keycode, keyrecord_t *record) {
+    if ((record->event.key.row != HOME_ROW_NUMBER_LEFT && record->event.key.row != HOME_ROW_NUMBER_RIGHT)
+            || record->tap.count || !IS_QK_MOD_TAP(keycode)) {
+        return true;
+    }
+
+    /* 5-bit packed modifiers
+     *
+     * Mod bits:    43210
+     *   bit 0      ||||+- Control
+     *   bit 1      |||+-- Shift
+     *   bit 2      ||+--- Alt
+     *   bit 3      |+---- Gui
+     *   bit 4      +----- LR flag(Left:0, Right:1)
+     */
+    uint8_t mod = QK_MOD_TAP_GET_MODS(keycode);
+
+    if (mod & 0b00110) {
+        return true;
+    }
+
+    void (*handler)(uint16_t) = record->event.pressed ? register_code16 : unregister_code16;
+    uint16_t mod_to_send = get_nav_code(pgm_read_word(&(os_enabled_homerowmods[(mod >> 3) & 1])));
+
+    handler(mod_to_send | ((KC_LCMD ^ KC_RCMD) * ((mod >> 4) & 1)));
+    return false;
+}
+
 bool process_record_nav(uint16_t keycode, keyrecord_t *record) {
     switch (keycode) {
         case KC_CTAB:
@@ -100,7 +134,11 @@ bool process_record_nav(uint16_t keycode, keyrecord_t *record) {
             break;
 
         default:
+#ifdef HOME_ROW_MODS
+            return process_record_os_enabled_homerowmod(keycode, record);
+#else
             return true;
+#endif
     }
 
     return false;

diff --git a/users/rhruiz/post_config.h b/users/rhruiz/post_config.h
@@ -0,0 +1,11 @@
+#ifndef HOME_ROW_NUMBER_RIGHT
+#define HOME_ROW_NUMBER_RIGHT MATRIX_ROWS - 3
+#endif
+
+#ifndef HOME_ROW_NUMBER_LEFT
+#ifdef SPLIT_KEYBOARD
+#define HOME_ROW_NUMBER_LEFT MATRIX_ROWS / 2 - 3
+#else
+#define HOME_ROW_NUMBER_RIGHT
+#endif
+#endif