1 files changed, 93 insertions, 0 deletions
diff --git a/users/konstantin/tap_dance.c b/users/konstantin/tap_dance.c
new file mode 100644
index 0000000000..b13f33c024
--- /dev/null
+++ b/users/konstantin/tap_dance.c
@@ -0,0 +1,93 @@
+#include "tap_dance.h"
+#include "konstantin.h"
+
+#define ACTION_TAP_DANCE_DOUBLE_MODS(mod1, mod2) { \
+    .fn = { td_double_mods_each, NULL, td_double_mods_reset }, \
+    .user_data = &(qk_tap_dance_pair_t){ mod1, mod2 }, \
+  }
+
+void td_double_mods_each(qk_tap_dance_state_t *state, void *user_data) {
+  qk_tap_dance_pair_t *mods = (qk_tap_dance_pair_t *)user_data;
+  // Single tap → mod1, double tap → mod2, triple tap etc. → mod1+mod2
+  if (state->count == 1 || state->count == 3) {
+    register_code(mods->kc1);
+  } else if (state->count == 2) {
+    unregister_code(mods->kc1);
+    register_code(mods->kc2);
+  }
+  // Prevent tap dance from sending kc1 and kc2 as weak mods
+  state->weak_mods &= ~(MOD_BIT(mods->kc1) | MOD_BIT(mods->kc2));
+}
+
+void td_double_mods_reset(qk_tap_dance_state_t *state, void *user_data) {
+  qk_tap_dance_pair_t *mods = (qk_tap_dance_pair_t *)user_data;
+  if (state->count == 1 || state->count >= 3) {
+    unregister_code(mods->kc1);
+  }
+  if (state->count >= 2) {
+    unregister_code(mods->kc2);
+  }
+}
+
+struct {
+  bool fn_on; // Layer state when tap dance started
+  bool started;
+} td_fn_rctrl_data;
+
+void td_fn_rctrl_each(qk_tap_dance_state_t *state, void *user_data) {
+  if (!td_fn_rctrl_data.started) {
+    td_fn_rctrl_data.fn_on = IS_LAYER_ON(L_FN);
+    td_fn_rctrl_data.started = true;
+  }
+  // Single tap → Fn, double tap → RCtrl, triple tap etc. → Fn+RCtrl
+  if (state->count == 1 || state->count == 3) {
+    layer_on(L_FN);
+  } else if (state->count == 2) {
+    if (!td_fn_rctrl_data.fn_on) {
+      layer_off(L_FN);
+    }
+    register_code(KC_RCTL);
+  }
+}
+
+void td_fn_rctrl_reset(qk_tap_dance_state_t *state, void *user_data) {
+  if ((state->count == 1 || state->count >= 3) && !td_fn_rctrl_data.fn_on) {
+    layer_off(L_FN);
+  }
+  if (state->count >= 2) {
+    unregister_code(KC_RCTL);
+  }
+  td_fn_rctrl_data.started = false;
+}
+
+void td_lsft_fn_each(qk_tap_dance_state_t *state, void *user_data) {
+  // Single tap → LShift, double tap → Fn, triple tap etc. → Fn+LShift
+  if (state->count == 1 || state->count == 3) {
+    register_code(KC_LSFT);
+  } else if (state->count == 2) {
+    unregister_code(KC_LSFT);
+    // Prevent tap dance from sending LShift as a weak mod
+    state->weak_mods &= ~MOD_BIT(KC_LSFT);
+    layer_on(L_FN);
+  }
+}
+
+void td_lsft_fn_reset(qk_tap_dance_state_t *state, void *user_data) {
+  if (state->count == 1 || state->count >= 3) {
+    unregister_code(KC_LSFT);
+  }
+  if (state->count >= 2) {
+    layer_off(L_FN);
+  }
+}
+
+qk_tap_dance_action_t tap_dance_actions[] = {
+  [TD_DESKTOP] = ACTION_TAP_DANCE_DOUBLE(LCTL(LGUI(KC_D)), LCTL(LGUI(KC_F4))), // Add/close virtual desktop
+
+  [TD_RAL_LAL] = ACTION_TAP_DANCE_DOUBLE_MODS(KC_RALT, KC_LALT),
+  [TD_RAL_RGU] = ACTION_TAP_DANCE_DOUBLE_MODS(KC_RALT, KC_RGUI),
+  [TD_RCT_RSF] = ACTION_TAP_DANCE_DOUBLE_MODS(KC_RCTL, KC_RSFT),
+
+  [TD_FN_RCTL] = ACTION_TAP_DANCE_FN_ADVANCED(td_fn_rctrl_each, NULL, td_fn_rctrl_reset),
+  [TD_LSFT_FN] = ACTION_TAP_DANCE_FN_ADVANCED(td_lsft_fn_each, NULL, td_lsft_fn_reset),
+};