Callum style layout improvements and my layout changes (#16174)

8 files changed, 762 insertions, 386 deletions

diff --git a/keyboards/a_dux/keymaps/daliusd/config.h b/keyboards/a_dux/keymaps/daliusd/config.h
index 42e88a687f..786451768a 100644
--- a/keyboards/a_dux/keymaps/daliusd/config.h
+++ b/keyboards/a_dux/keymaps/daliusd/config.h
@@ -17,7 +17,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 #pragma once
 
-#define UNICODE_SELECTED_MODES UC_MAC, UC_LNX
+#define UNICODE_SELECTED_MODES UC_LNX
 
 #define MOUSEKEY_INTERVAL 12
 #define MOUSEKEY_MAX_SPEED 6
@@ -30,3 +30,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #define MOUSEKEY_WHEEL_INTERVAL 50
 // The default is 40
 #define MOUSEKEY_WHEEL_TIME_TO_MAX 100
+
+#define FLOW_COUNT 6
+#define FLOW_LAYERS_COUNT 5
diff --git a/keyboards/a_dux/keymaps/daliusd/flow.c b/keyboards/a_dux/keymaps/daliusd/flow.c
new file mode 100644
index 0000000000..6e4db873fe
--- /dev/null
+++ b/keyboards/a_dux/keymaps/daliusd/flow.c
@@ -0,0 +1,336 @@
+/* Copyright 2022 @daliusd
+ *
+ * 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 "flow.h"
+
+extern const uint16_t flow_config[FLOW_COUNT][2];
+extern const uint16_t flow_layers_config[FLOW_LAYERS_COUNT][2];
+
+// Represents the states a flow key can be in
+typedef enum {
+    flow_up_unqueued,
+    flow_up_queued,
+    flow_up_queued_used,
+    flow_down_unused,
+    flow_down_used,
+} flow_state_t;
+
+#ifdef FLOW_ONESHOT_TERM
+const int g_flow_oneshot_term = FLOW_ONESHOT_TERM;
+#else
+const int g_flow_oneshot_term = 500;
+#endif
+
+#ifdef FLOW_ONESHOT_WAIT_TERM
+const int g_flow_oneshot_wait_term = FLOW_ONESHOT_WAIT_TERM;
+#else
+const int g_flow_oneshot_wait_term = 500;
+#endif
+
+flow_state_t flow_state[FLOW_COUNT] = { [0 ... FLOW_COUNT - 1] = flow_up_unqueued };
+bool flow_pressed[FLOW_COUNT][2] = { [0 ... FLOW_COUNT - 1] = {false, false} };
+uint16_t flow_timers[FLOW_COUNT] = { [0 ... FLOW_COUNT - 1] = 0 };
+bool flow_timeout_timers_active[FLOW_COUNT] = { [0 ... FLOW_COUNT - 1] = false };
+uint16_t flow_timeout_timers_value[FLOW_COUNT] = { [0 ... FLOW_COUNT - 1] = 0 };
+uint16_t flow_timeout_wait_timers_value[FLOW_COUNT] = { [0 ... FLOW_COUNT - 1] = 0 };
+
+flow_state_t flow_layers_state[FLOW_LAYERS_COUNT] = {
+    [0 ... FLOW_LAYERS_COUNT - 1] = flow_up_unqueued
+};
+bool flow_layer_timeout_timers_active[FLOW_LAYERS_COUNT] = { [0 ... FLOW_LAYERS_COUNT - 1] = false };
+uint16_t flow_layer_timeout_timers_value[FLOW_LAYERS_COUNT] = { [0 ... FLOW_LAYERS_COUNT - 1] = 0 };
+uint16_t flow_layer_timeout_wait_timers_value[FLOW_LAYERS_COUNT] = { [0 ... FLOW_LAYERS_COUNT - 1] = 0 };
+
+bool is_flow_ignored_key(uint16_t keycode) {
+    for (int i = 0; i < FLOW_COUNT; i++) {
+        if (flow_config[i][0] == keycode) {
+            return true;
+        }
+    }
+
+    for (int i = 0; i < FLOW_LAYERS_COUNT; i++) {
+        if (flow_layers_config[i][0] == keycode) {
+            return true;
+        }
+    }
+
+    if (keycode == KC_LSFT || keycode == KC_RSFT
+            || keycode == KC_LCTL || keycode == KC_RCTL
+            || keycode == KC_LALT || keycode == KC_RALT
+            || keycode == KC_LGUI || keycode == KC_RGUI) {
+        return true;
+    }
+
+    return false;
+}
+
+bool update_flow_mods(
+    uint16_t keycode,
+    bool pressed
+) {
+    bool pass = true;
+    bool flow_key_list_triggered[FLOW_COUNT] = { [0 ... FLOW_COUNT - 1] = false };
+    bool flow_key_list_pressed[FLOW_COUNT] = { [0 ... FLOW_COUNT - 1] = false };
+
+    bool flow_triggered = false;
+
+    for (uint8_t i = 0; i < FLOW_COUNT; i++) {
+        // Layer key
+        if (keycode == flow_config[i][0]) {
+            if (pressed) {
+                flow_pressed[i][0] = true;
+            } else {
+                flow_pressed[i][0] = false;
+            }
+        // KC mod key
+        } else if (keycode == flow_config[i][1]) {
+            if (pressed) {
+                if (flow_pressed[i][0]) {
+                    flow_pressed[i][1] = true;
+                    flow_key_list_triggered[i] = true;
+                    flow_triggered = true;
+                    flow_key_list_pressed[i] = true;
+                    pass = false;
+                 }
+            } else if (flow_pressed[i][1]) {
+                flow_pressed[i][1] = false;
+                if (flow_pressed[i][0]) {
+                    flow_key_list_triggered[i] = true;
+                    flow_triggered = true;
+                    pass = false;
+                } else if ((flow_state[i] == flow_down_unused)
+                        || (flow_state[i] == flow_down_used)) {
+                    flow_key_list_triggered[i] = true;
+                    flow_triggered = true;
+                    pass = false;
+                }
+            }
+        }
+    }
+
+    for (uint8_t i = 0; i < FLOW_COUNT; i++) {
+        if (flow_key_list_triggered[i]) {
+            if (flow_key_list_pressed[i]) {
+                if (flow_state[i] == flow_up_unqueued) {
+                    register_code(flow_config[i][1]);
+                }
+                flow_timeout_wait_timers_value[i] = timer_read();
+                flow_state[i] = flow_down_unused;
+            } else {
+                // Trigger keyup
+                switch (flow_state[i]) {
+                case flow_down_unused:
+                    if (!flow_pressed[i][1]) {
+                        if (timer_elapsed(flow_timeout_wait_timers_value[i]) > g_flow_oneshot_wait_term) {
+                            flow_state[i] = flow_up_unqueued;
+                            unregister_code(flow_config[i][1]);
+                        } else {
+                            // If we didn't use the mod while trigger was held, queue it.
+                            flow_state[i] = flow_up_queued;
+                            flow_timeout_timers_active[i] = true;
+                            flow_timeout_timers_value[i] = timer_read();
+                        }
+                    }
+                    break;
+                case flow_down_used:
+                    // If we did use the mod while trigger was held, unregister it.
+                    if (!flow_pressed[i][1]) {
+                        flow_state[i] = flow_up_unqueued;
+                        unregister_code(flow_config[i][1]);
+                    }
+                    break;
+                default:
+                    break;
+                }
+            }
+        } else if (!flow_triggered) {
+            if (pressed) {
+                if (!is_flow_ignored_key(keycode)) {
+                    switch (flow_state[i]) {
+                    case flow_up_queued:
+                        flow_state[i] = flow_up_queued_used;
+                        flow_timeout_timers_active[i] = false;
+                        break;
+                    case flow_up_queued_used:
+                        flow_state[i] = flow_up_unqueued;
+                        unregister_code(flow_config[i][1]);
+                        break;
+                    default:
+                        break;
+                    }
+                }
+            } else {
+                if (!is_flow_ignored_key(keycode)) {
+                    // On non-ignored keyup, consider the oneshot used.
+                    switch (flow_state[i]) {
+                    case flow_down_unused:
+                        flow_state[i] = flow_down_used;
+                        break;
+                    case flow_up_queued:
+                        flow_state[i] = flow_up_unqueued;
+                        unregister_code(flow_config[i][1]);
+                        break;
+                    case flow_up_queued_used:
+                        flow_state[i] = flow_up_unqueued;
+                        unregister_code(flow_config[i][1]);
+                        break;
+                    default:
+                        break;
+                    }
+                }
+            }
+        }
+    }
+
+    return pass;
+}
+
+void change_pressed_status(uint16_t keycode, bool pressed) {
+    for (int i = 0; i < FLOW_COUNT; i++) {
+        if (flow_config[i][0] == keycode) {
+            flow_pressed[i][0] = pressed;
+        }
+    }
+}
+
+bool update_flow_layers(
+    uint16_t keycode,
+    bool pressed,
+    keypos_t key_position
+) {
+    uint8_t key_layer = read_source_layers_cache(key_position);
+    bool pass = true;
+
+    for (int i = 0; i < FLOW_LAYERS_COUNT; i++) {
+        uint16_t trigger = flow_layers_config[i][0];
+        uint16_t layer = flow_layers_config[i][1];
+
+        if (keycode == trigger) {
+            if (pressed) {
+                // Trigger keydown
+                if (flow_layers_state[i] == flow_up_unqueued) {
+                    layer_on(layer);
+                    change_pressed_status(trigger, true);
+                }
+                flow_layer_timeout_wait_timers_value[i] = timer_read();
+                flow_layers_state[i] = flow_down_unused;
+                pass = false;
+            } else {
+                // Trigger keyup
+                switch (flow_layers_state[i]) {
+                case flow_down_unused:
+                    if (timer_elapsed(flow_layer_timeout_wait_timers_value[i]) > g_flow_oneshot_wait_term) {
+                        flow_layers_state[i] = flow_up_unqueued;
+                        layer_off(layer);
+                        change_pressed_status(trigger, false);
+                        pass = false;
+                    } else {
+                        // If we didn't use the layer while trigger was held, queue it.
+                        flow_layers_state[i] = flow_up_queued;
+                        flow_layer_timeout_timers_active[i] = true;
+                        flow_layer_timeout_timers_value[i] = timer_read();
+                        pass = false;
+                        change_pressed_status(trigger, true);
+                    }
+                    break;
+                case flow_down_used:
+                    // If we did use the layer while trigger was held, turn off it.
+                    flow_layers_state[i] = flow_up_unqueued;
+                    layer_off(layer);
+                    change_pressed_status(trigger, false);
+                    pass = false;
+                    break;
+                default:
+                    break;
+                }
+            }
+        } else {
+            if (pressed) {
+                if (key_layer == layer) {
+                    // On non-ignored keyup, consider the oneshot used.
+                    switch (flow_layers_state[i]) {
+                    case flow_down_unused:
+                        flow_layers_state[i] = flow_down_used;
+                        break;
+                    case flow_up_queued:
+                        flow_layers_state[i] = flow_up_queued_used;
+                        flow_layer_timeout_timers_active[i] = false;
+                        break;
+                   case flow_up_queued_used:
+                        flow_layers_state[i] = flow_up_unqueued;
+                        layer_off(layer);
+                        change_pressed_status(trigger, false);
+                        pass = false;
+                        break;
+                    default:
+                        break;
+                    }
+                }
+            } else {
+                // Ignore key ups from other layers
+                if (key_layer == layer) {
+                    // On non-ignored keyup, consider the oneshot used.
+                    switch (flow_layers_state[i]) {
+                    case flow_up_queued:
+                        flow_layers_state[i] = flow_up_unqueued;
+                        layer_off(layer);
+                        change_pressed_status(trigger, false);
+                        break;
+                    case flow_up_queued_used:
+                        flow_layers_state[i] = flow_up_unqueued;
+                        layer_off(layer);
+                        change_pressed_status(trigger, false);
+                        break;
+                    default:
+                        break;
+                    }
+                }
+            }
+        }
+    }
+
+    return pass;
+}
+
+bool update_flow(
+    uint16_t keycode,
+    bool pressed,
+    keypos_t key_position
+) {
+    bool pass = update_flow_mods(keycode, pressed);
+    pass = update_flow_layers(keycode, pressed, key_position) & pass;
+    return pass;
+}
+
+void flow_matrix_scan(void) {
+    for (int i = 0; i < FLOW_COUNT; i++) {
+        if (flow_timeout_timers_active[i]
+                && timer_elapsed(flow_timeout_timers_value[i]) > g_flow_oneshot_term) {
+            flow_timeout_timers_active[i] = false;
+            flow_state[i] = flow_up_unqueued;
+            unregister_code(flow_config[i][1]);
+        }
+    }
+
+    for (int i = 0; i < FLOW_LAYERS_COUNT; i++) {
+        if (flow_layer_timeout_timers_active[i]
+                && timer_elapsed(flow_layer_timeout_timers_value[i]) > g_flow_oneshot_term) {
+            flow_layer_timeout_timers_active[i] = false;
+            flow_layers_state[i] = flow_up_unqueued;
+            layer_off(flow_layers_config[i][1]);
+            change_pressed_status(flow_layers_config[i][0], false);
+        }
+    }
+}
diff --git a/keyboards/a_dux/keymaps/daliusd/flow.h b/keyboards/a_dux/keymaps/daliusd/flow.h
new file mode 100644
index 0000000000..e9ac32c8ed
--- /dev/null
+++ b/keyboards/a_dux/keymaps/daliusd/flow.h
@@ -0,0 +1,27 @@
+/*
+Copyright 2022 Dalius Dobravolskas <dalius.dobravolskas@gmail.com>
+
+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/>.
+*/
+#pragma once
+
+#include QMK_KEYBOARD_H
+
+bool update_flow(
+    uint16_t keycode,
+    bool pressed,
+    keypos_t key_position
+);
+
+void flow_matrix_scan(void);
diff --git a/keyboards/a_dux/keymaps/daliusd/keymap.c b/keyboards/a_dux/keymaps/daliusd/keymap.c
index aa45d10449..3da9b76057 100644
--- a/keyboards/a_dux/keymaps/daliusd/keymap.c
+++ b/keyboards/a_dux/keymaps/daliusd/keymap.c
@@ -15,7 +15,7 @@
  */
 #include QMK_KEYBOARD_H
 
-#include "oneshot.h"
+#include "flow.h"
 
 // Each layer gets a name for readability, which is then used in the keymap matrix below.
 // The underscores don't mean anything - you can have a layer called STUFF or any other name.
@@ -25,11 +25,12 @@ enum layers {
     _QWERTY,
     _SYM,
     _NAV,
-    _NUMB,
+    _MISC,
     _TMUX,
     _MOUSE,
-    _MISC,
     _FUNC,
+    _LT_MAC,
+    _LT_LINUX,
 };
 
 enum custom_keycodes {
@@ -41,22 +42,40 @@ enum custom_keycodes {
   TM_SLCT,
   TM_SRCH,
   TM_URL,
-  OS_CTRL,
-  OS_ALT,
-  OS_GUI,
-  OS_TMUX,
   OS_MISC,
+  OS_TMUX,
   OS_FUNC,
+  LT_OSLNX,
 };
 
 // Shortcut to make keymap more readable
 
 #define L_NAV       MO(_NAV)
 #define L_SYM       MO(_SYM)
-#define L_MOUSE     TG(_MOUSE)
+#define L_MOUSE     MO(_MOUSE)
 
 #define K_PRINT     (QK_LCTL | QK_LSFT | QK_LGUI | KC_4)
+#define K_VIDEO     (QK_LSFT | QK_LGUI | KC_5)
+
+// flow_config should correspond to following format:
+// * layer keycode
+// * modifier keycode
+const uint16_t flow_config[FLOW_COUNT][2] = {
+    {L_NAV, KC_LALT},
+    {L_NAV, KC_LGUI},
+    {L_NAV, KC_LCTL},
+    {L_SYM, KC_RCTL},
+    {L_SYM, KC_RGUI},
+    {L_SYM, KC_RALT},
+};
 
+const uint16_t flow_layers_config[FLOW_LAYERS_COUNT][2] = {
+    {OS_MISC, _MISC},
+    {OS_TMUX, _TMUX},
+    {OS_FUNC, _FUNC},
+};
+
+// Unicode characters
 enum unicode_names {
     SNEK,
     EURO,
@@ -96,7 +115,7 @@ const uint32_t PROGMEM unicode_map[] = {
     [LT_S_I] = 0x12f, // į
     [LT_L_I] = 0x12e, // Į
     [LT_S_S] = 0x161, // š
-    [LT_L_S] = 0x160, // Š'
+    [LT_L_S] = 0x160, // Š
     [LT_S_U1] = 0x173, // ų
     [LT_L_U1] = 0x172, // Ų
     [LT_S_U2] = 0x16b, // ū
@@ -110,14 +129,23 @@ const uint32_t PROGMEM unicode_map[] = {
 #define K_SNEK      X(SNEK)
 #define K_EURO      X(EURO)
 #define K_LT_A      XP(LT_S_A, LT_L_A)
+#define K_LT_AU     X(LT_L_A)
 #define K_LT_C      XP(LT_S_C, LT_L_C)
+#define K_LT_CU     X(LT_L_C)
 #define K_LT_E1     XP(LT_S_E1, LT_L_E1)
+#define K_LT_E1U    X(LT_L_E1)
 #define K_LT_E2     XP(LT_S_E2, LT_L_E2)
+#define K_LT_E2U    X(LT_L_E2)
 #define K_LT_I      XP(LT_S_I, LT_L_I)
+#define K_LT_IU     X(LT_L_I)
 #define K_LT_S      XP(LT_S_S, LT_L_S)
+#define K_LT_SU     X(LT_L_S)
 #define K_LT_U1     XP(LT_S_U1, LT_L_U1)
+#define K_LT_U1U    X(LT_L_U1)
 #define K_LT_U2     XP(LT_S_U2, LT_L_U2)
+#define K_LT_U2U    X(LT_L_U2)
 #define K_LT_Z      XP(LT_S_Z, LT_L_Z)
+#define K_LT_ZU     X(LT_L_Z)
 #define K_LT_OB     X(LT_OB)
 #define K_LT_CB     X(LT_CB)
 
@@ -139,35 +167,35 @@ const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
   //┌────────┬────────┬────────┬────────┬────────┐                         ┌────────┬────────┬────────┬────────┬────────┐
      KC_EXLM ,KC_AT   ,KC_HASH ,KC_DLR  ,KC_PERC ,                          KC_CIRC ,KC_AMPR ,KC_ASTR ,KC_LPRN ,KC_RPRN ,
   //├────────┼────────┼────────┼────────┼────────┤                         ├────────┼────────┼────────┼────────┼────────┤
-     KC_GRV  ,KC_PLUS ,KC_LBRC ,KC_RBRC ,K_LT_OB ,                          KC_MINS ,OS_ALT  ,OS_CTRL ,OS_GUI  ,KC_PIPE ,
+     XXXXXXX ,KC_GRV  ,KC_LBRC ,KC_RBRC ,KC_PLUS ,                          KC_MINS ,KC_PIPE ,KC_RCTL ,KC_RGUI ,KC_RALT ,
   //├────────┼────────┼────────┼────────┼────────┤                         ├────────┼────────┼────────┼────────┼────────┤
-     K_SNEK  ,KC_EQL  ,KC_LCBR ,KC_RCBR ,K_LT_CB ,                          KC_UNDS ,KC_QUOT ,KC_DQT  ,K_EURO  ,KC_BSLS ,
+     KC_DEL  ,KC_BSPC ,KC_LCBR ,KC_RCBR ,KC_EQL  ,                          KC_UNDS ,KC_QUOT ,KC_DQT  ,OS_MISC ,KC_BSLS ,
   //└────────┴────────┴────────┴────┬───┴────┬───┼────────┐       ┌────────┼───┬────┴───┬────┴────────┴────────┴────────┘
-                                     _______ ,    _______ ,        _______ ,    _______
+                                     _______ ,    _______ ,        _______ ,    XXXXXXX
   //                                └────────┘   └────────┘       └────────┘   └────────┘
   ),
 
   [_NAV] = LAYOUT(
   //┌────────┬────────┬────────┬────────┬────────┐                         ┌────────┬────────┬────────┬────────┬────────┐
-     KC_TILDE,L_MOUSE ,OS_FUNC ,OS_MISC ,OS_TMUX ,                          K_LT_A  ,K_LT_C  ,K_LT_E1 ,K_LT_E2 ,K_LT_I  ,
+     KC_1    ,KC_2    ,KC_3    ,KC_4    ,KC_5    ,                          KC_6    ,KC_7    ,KC_8    ,KC_9    ,KC_0    ,
   //├────────┼────────┼────────┼────────┼────────┤                         ├────────┼────────┼────────┼────────┼────────┤
-     KC_TAB  ,OS_GUI  ,OS_CTRL ,OS_ALT  ,KC_ENT  ,                          KC_LEFT ,KC_DOWN ,KC_UP   ,KC_RIGHT,KC_END  ,
+     KC_LALT ,KC_LGUI ,KC_LCTL ,KC_TAB  ,KC_ENT  ,                          KC_LEFT ,KC_DOWN ,KC_UP   ,KC_RIGHT,KC_PGUP ,
   //├────────┼────────┼────────┼────────┼────────┤                         ├────────┼────────┼────────┼────────┼────────┤
-     KC_DELT ,KC_BSPC ,KC_ESC  ,KC_PGDN ,KC_PGUP ,                          KC_HOME ,K_LT_S  ,K_LT_U1 ,K_LT_U2 ,K_LT_Z  ,
+     KC_LSFT ,KC_BSPC ,KC_ESC  ,KC_TILDE,OS_TMUX ,                          OS_FUNC ,L_MOUSE ,KC_COMM ,KC_DOT  ,KC_PGDN ,
   //└────────┴────────┴────────┴────┬───┴────┬───┼────────┐       ┌────────┼───┬────┴───┬────┴────────┴────────┴────────┘
-                                     _______ ,    _______ ,        _______ ,    _______
+                                     XXXXXXX ,    _______ ,        _______ ,    _______
   //                                └────────┘   └────────┘       └────────┘   └────────┘
   ),
 
-  [_NUMB] = LAYOUT(
+  [_MISC] = LAYOUT(
   //┌────────┬────────┬────────┬────────┬────────┐                         ┌────────┬────────┬────────┬────────┬────────┐
-     KC_1    ,KC_2    ,KC_3    ,KC_4    ,KC_5    ,                          XXXXXXX ,XXXXXXX ,XXXXXXX ,XXXXXXX ,XXXXXXX ,
+     RESET   ,XXXXXXX ,XXXXXXX ,XXXXXXX ,XXXXXXX ,                          KC_BRID ,KC_BRIU ,KC_PSCR ,XXXXXXX ,K_PRINT ,
   //├────────┼────────┼────────┼────────┼────────┤                         ├────────┼────────┼────────┼────────┼────────┤
-     KC_6    ,KC_7    ,KC_8    ,KC_9    ,KC_0    ,                          XXXXXXX ,OS_ALT  ,OS_CTRL ,OS_GUI  ,XXXXXXX ,
+     XXXXXXX ,XXXXXXX ,DEBUG   ,LT_OSLNX,XXXXXXX ,                          KC_MPRV ,KC_MPLY ,KC_MNXT ,XXXXXXX ,K_VIDEO ,
   //├────────┼────────┼────────┼────────┼────────┤                         ├────────┼────────┼────────┼────────┼────────┤
-     KC_DELT ,KC_BSPC ,XXXXXXX ,XXXXXXX ,XXXXXXX ,                          XXXXXXX ,XXXXXXX ,XXXXXXX ,XXXXXXX ,XXXXXXX ,
+     XXXXXXX ,XXXXXXX ,XXXXXXX ,XXXXXXX ,XXXXXXX ,                          KC_VOLD ,KC_VOLU ,XXXXXXX ,XXXXXXX ,XXXXXXX ,
   //└────────┴────────┴────────┴────┬───┴────┬───┼────────┐       ┌────────┼───┬────┴───┬────┴────────┴────────┴────────┘
-                                     _______ ,    _______ ,        _______ ,    _______
+                                     XXXXXXX ,    XXXXXXX ,        XXXXXXX ,    XXXXXXX
   //                                └────────┘   └────────┘       └────────┘   └────────┘
   ),
 
@@ -185,127 +213,59 @@ const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
 
   [_MOUSE] = LAYOUT(
   //┌────────┬────────┬────────┬────────┬────────┐                         ┌────────┬────────┬────────┬────────┬────────┐
-     XXXXXXX ,L_MOUSE ,KC_MS_U ,KC_BTN3 ,KC_WH_U ,                          XXXXXXX ,XXXXXXX ,XXXXXXX ,XXXXXXX ,XXXXXXX ,
+     XXXXXXX ,XXXXXXX ,KC_MS_U ,KC_BTN3 ,KC_WH_U ,                          XXXXXXX ,XXXXXXX ,XXXXXXX ,XXXXXXX ,XXXXXXX ,
   //├────────┼────────┼────────┼────────┼────────┤                         ├────────┼────────┼────────┼────────┼────────┤
-     XXXXXXX ,KC_MS_L ,KC_MS_D ,KC_MS_R ,KC_WH_D ,                          XXXXXXX ,KC_LALT ,KC_LCTL ,KC_LGUI ,XXXXXXX ,
+     XXXXXXX ,KC_MS_L ,KC_MS_D ,KC_MS_R ,KC_WH_D ,                          XXXXXXX ,XXXXXXX ,KC_RCTL ,KC_RGUI ,KC_RALT ,
   //├────────┼────────┼────────┼────────┼────────┤                         ├────────┼────────┼────────┼────────┼────────┤
-     XXXXXXX ,XXXXXXX ,KC_ESC  ,XXXXXXX ,XXXXXXX ,                          XXXXXXX ,XXXXXXX ,XXXXXXX ,XXXXXXX ,XXXXXXX ,
+     XXXXXXX ,XXXXXXX ,XXXXXXX ,XXXXXXX ,XXXXXXX ,                          XXXXXXX ,XXXXXXX ,XXXXXXX ,XXXXXXX ,XXXXXXX ,
   //└────────┴────────┴────────┴────┬───┴────┬───┼────────┐       ┌────────┼───┬────┴───┬────┴────────┴────────┴────────┘
-                                     KC_BTN1 ,    KC_BTN2 ,        XXXXXXX ,    XXXXXXX
+                                     KC_BTN1 ,    KC_BTN2 ,        _______ ,    XXXXXXX
   //                                └────────┘   └────────┘       └────────┘   └────────┘
   ),
 
-  [_MISC] = LAYOUT(
+  [_FUNC] = LAYOUT(
   //┌────────┬────────┬────────┬────────┬────────┐                         ┌────────┬────────┬────────┬────────┬────────┐
-     QK_BOOT,XXXXXXX ,XXXXXXX ,XXXXXXX ,XXXXXXX ,                          KC_BRID ,KC_BRIU ,XXXXXXX ,KC_PSCR ,K_PRINT ,
+     KC_F1   ,KC_F2   ,KC_F3   ,KC_F4   ,KC_F5   ,                          XXXXXXX ,XXXXXXX ,XXXXXXX ,XXXXXXX ,XXXXXXX ,
   //├────────┼────────┼────────┼────────┼────────┤                         ├────────┼────────┼────────┼────────┼────────┤
-     XXXXXXX ,XXXXXXX ,DEBUG   ,XXXXXXX ,XXXXXXX ,                          KC_MPRV ,KC_MPLY ,XXXXXXX ,KC_MNXT ,XXXXXXX ,
+     KC_F6   ,KC_F7   ,KC_F8   ,KC_F9   ,KC_F10  ,                          XXXXXXX ,XXXXXXX ,KC_RCTL ,KC_RGUI ,KC_RALT ,
   //├────────┼────────┼────────┼────────┼────────┤                         ├────────┼────────┼────────┼────────┼────────┤
-     XXXXXXX ,XXXXXXX ,XXXXXXX ,XXXXXXX ,XXXXXXX ,                          KC_VOLD ,KC_VOLU ,XXXXXXX ,XXXXXXX ,UC_MOD  ,
+     KC_F11  ,KC_F12  ,XXXXXXX ,XXXXXXX ,XXXXXXX ,                          XXXXXXX ,XXXXXXX ,XXXXXXX ,XXXXXXX ,XXXXXXX ,
   //└────────┴────────┴────────┴────┬───┴────┬───┼────────┐       ┌────────┼───┬────┴───┬────┴────────┴────────┴────────┘
                                      XXXXXXX ,    XXXXXXX ,        XXXXXXX ,    XXXXXXX
   //                                └────────┘   └────────┘       └────────┘   └────────┘
   ),
 
-  [_FUNC] = LAYOUT(
+  [_LT_MAC] = LAYOUT(
   //┌────────┬────────┬────────┬────────┬────────┐                         ┌────────┬────────┬────────┬────────┬────────┐
-     XXXXXXX ,XXXXXXX ,XXXXXXX ,XXXXXXX ,XXXXXXX ,                          KC_F1   ,KC_F2   ,KC_F3   ,KC_F4   ,KC_F5   ,
+     KC_EXLM ,KC_AT   ,KC_HASH ,KC_DLR  ,KC_PERC ,                          KC_CIRC ,KC_AMPR ,KC_ASTR ,KC_PLUS ,XXXXXXX ,
   //├────────┼────────┼────────┼────────┼────────┤                         ├────────┼────────┼────────┼────────┼────────┤
-     XXXXXXX ,XXXXXXX ,XXXXXXX ,XXXXXXX ,XXXXXXX ,                          KC_F6   ,KC_F7   ,KC_F8   ,KC_F9   ,KC_F10  ,
+     KC_1    ,KC_2    ,KC_3    ,KC_4    ,KC_5    ,                          KC_6    ,KC_7    ,KC_8    ,KC_EQL  ,XXXXXXX ,
   //├────────┼────────┼────────┼────────┼────────┤                         ├────────┼────────┼────────┼────────┼────────┤
-     XXXXXXX ,XXXXXXX ,XXXXXXX ,XXXXXXX ,XXXXXXX ,                          KC_F11  ,KC_F12  ,XXXXXXX ,XXXXXXX ,XXXXXXX ,
+     XXXXXXX ,KC_BSPC ,XXXXXXX ,XXXXXXX ,XXXXXXX ,                          XXXXXXX ,XXXXXXX ,XXXXXXX ,XXXXXXX ,XXXXXXX ,
   //└────────┴────────┴────────┴────┬───┴────┬───┼────────┐       ┌────────┼───┬────┴───┬────┴────────┴────────┴────────┘
-                                     XXXXXXX ,    XXXXXXX ,        XXXXXXX ,    XXXXXXX
+                                     XXXXXXX ,    XXXXXXX ,        _______ ,    XXXXXXX
+  //                                └────────┘   └────────┘       └────────┘   └────────┘
+  ),
+
+  [_LT_LINUX] = LAYOUT(
+  //┌────────┬────────┬────────┬────────┬────────┐                         ┌────────┬────────┬────────┬────────┬────────┐
+     K_LT_AU ,K_LT_CU ,K_LT_E1U,K_LT_E2U,K_LT_IU ,                          K_LT_SU ,K_LT_U1U,K_LT_U2U,K_LT_ZU ,XXXXXXX ,
+  //├────────┼────────┼────────┼────────┼────────┤                         ├────────┼────────┼────────┼────────┼────────┤
+     K_LT_A  ,K_LT_C  ,K_LT_E1 ,K_LT_E2 ,K_LT_I  ,                          K_LT_S  ,K_LT_U1 ,K_LT_U2 ,K_LT_Z  ,XXXXXXX ,
+  //├────────┼────────┼────────┼────────┼────────┤                         ├────────┼────────┼────────┼────────┼────────┤
+     XXXXXXX ,KC_BSPC ,XXXXXXX ,K_SNEK  ,K_LT_OB ,                          K_LT_CB ,K_EURO  ,XXXXXXX ,XXXXXXX ,XXXXXXX ,
+  //└────────┴────────┴────────┴────┬───┴────┬───┼────────┐       ┌────────┼───┬────┴───┬────┴────────┴────────┴────────┘
+                                     XXXXXXX ,    XXXXXXX ,        _______ ,    XXXXXXX
   //                                └────────┘   └────────┘       └────────┘   └────────┘
   ),
 };
 
 #define TMUX_PREFIX SS_DOWN(X_LCTL) "b" SS_UP(X_LCTL)
 
-bool is_oneshot_cancel_key(uint16_t keycode) {
-    switch (keycode) {
-    case L_SYM:
-    case L_NAV:
-        return true;
-    default:
-        return false;
-    }
-}
-
-bool is_oneshot_layer_cancel_key(uint16_t keycode) {
-    switch (keycode) {
-    case L_SYM:
-    case L_NAV:
-        return true;
-    default:
-        return false;
-    }
-}
-
-bool is_oneshot_ignored_key(uint16_t keycode) {
-    switch (keycode) {
-    case L_SYM:
-    case L_NAV:
-    case OS_CTRL:
-    case OS_ALT:
-    case OS_GUI:
-    case OS_TMUX:
-    case OS_MISC:
-    case KC_LSFT:
-        return true;
-    default:
-        return false;
-    }
-}
-
-bool is_oneshot_mod_key(uint16_t keycode) {
-    switch (keycode) {
-    case OS_CTRL:
-    case OS_ALT:
-    case OS_GUI:
-        return true;
-    default:
-        return false;
-    }
-}
-
-oneshot_state os_ctrl_state = os_up_unqueued;
-oneshot_state os_alt_state = os_up_unqueued;
-oneshot_state os_cmd_state = os_up_unqueued;
-oneshot_state os_tmux_state = os_up_unqueued;
-oneshot_state os_misc_state = os_up_unqueued;
-oneshot_state os_func_state = os_up_unqueued;
+bool lt_os_is_linux = false;
 
 bool process_record_user(uint16_t keycode, keyrecord_t *record) {
-    update_oneshot(
-        &os_ctrl_state, KC_LCTL, OS_CTRL,
-        keycode, record
-    );
-    update_oneshot(
-        &os_alt_state, KC_LALT, OS_ALT,
-        keycode, record
-    );
-    update_oneshot(
-        &os_cmd_state, KC_LGUI, OS_GUI,
-        keycode, record
-    );
-
-    bool handled = true;
-    handled = update_oneshot_layer(
-        &os_tmux_state, _TMUX, OS_TMUX,
-        keycode, record
-    ) & handled;
-
-    handled = update_oneshot_layer(
-        &os_misc_state, _MISC, OS_MISC,
-        keycode, record
-    ) & handled;
-
-    handled = update_oneshot_layer(
-        &os_func_state, _FUNC, OS_FUNC,
-        keycode, record
-    ) & handled;
-    if (!handled) return false;
+    if (!update_flow(keycode, record->event.pressed, record->event.key)) return false;
 
     switch (keycode) {
         case TM_LEFT:
@@ -340,10 +300,35 @@ bool process_record_user(uint16_t keycode, keyrecord_t *record) {
             if (!record->event.pressed) return true;
             SEND_STRING(TMUX_PREFIX SS_LCTL("u"));
             return false;
+        case LT_OSLNX:
+            if (!record->event.pressed) return true;
+            lt_os_is_linux = !lt_os_is_linux;
+            return false;
     }
     return true;
 }
 
+void matrix_scan_user(void) {
+    flow_matrix_scan();
+}
+
+bool lang_layer_on = false;
+
 layer_state_t layer_state_set_user(layer_state_t state) {
-    return update_tri_layer_state(state, _SYM, _NAV, _NUMB);
+    state = update_tri_layer_state(state, _SYM, _NAV, lt_os_is_linux ? _LT_LINUX : _LT_MAC);
+
+    uint8_t hl = get_highest_layer(state);
+    if (hl == _LT_MAC) {
+        if (!lang_layer_on) {
+            tap_code16(LCTL(KC_SPC));
+            lang_layer_on = true;
+        }
+    } else {
+        if (lang_layer_on) {
+            tap_code16(LCTL(KC_SPC));
+            lang_layer_on = false;
+        }
+    }
+
+    return state;
 }
diff --git a/keyboards/a_dux/keymaps/daliusd/oneshot.c b/keyboards/a_dux/keymaps/daliusd/oneshot.c
deleted file mode 100644
index 1e7b4d9650..0000000000
--- a/keyboards/a_dux/keymaps/daliusd/oneshot.c
+++ /dev/null
@@ -1,195 +0,0 @@
-/* Copyright 2021 @daliusd
- *
- * 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 "print.h"
-#include "oneshot.h"
-
-void update_oneshot(
-    oneshot_state *state,
-    uint16_t mod,
-    uint16_t trigger,
-    uint16_t keycode,
-    keyrecord_t *record
-) {
-    if (keycode == trigger) {
-        if (record->event.pressed) {
-            // Trigger keydown
-            if (*state == os_up_unqueued) {
-                register_code(mod);
-            }
-            *state = os_down_unused;
-            dprintf("trigger down (on?), mod: %d, ? -> os_down_unused\n", mod);
-        } else {
-            // Trigger keyup
-            switch (*state) {
-            case os_down_unused:
-                // If we didn't use the mod while trigger was held, queue it.
-                *state = os_up_queued;
-                dprintf("trigger up, mod: %d, os_down_unused -> os_up_queued\n", mod);
-                break;
-            case os_down_used:
-                // If we did use the mod while trigger was held, unregister it.
-                *state = os_up_unqueued;
-                unregister_code(mod);
-                dprintf("trigger up (off), mod: %d, os_down_used -> os_up_unqueued\n", mod);
-                break;
-            default:
-                break;
-            }
-        }
-    } else {
-        if (record->event.pressed) {
-            if (is_oneshot_cancel_key(keycode) && *state != os_up_unqueued) {
-                // Cancel oneshot on designated cancel keydown.
-                *state = os_up_unqueued;
-                unregister_code(mod);
-                dprintf("cancel (off), mod: %d, ? -> os_up_unqueued\n", mod);
-            }
-            if (!is_oneshot_ignored_key(keycode)) {
-                switch (*state) {
-                case os_up_queued:
-                    *state = os_up_queued_used;
-                    dprintf("key up (off), mod: %d, os_up_queued -> os_up_queued_used\n", mod);
-                    break;
-                case os_up_queued_used:
-                    *state = os_up_unqueued;
-                    unregister_code(mod);
-                    dprintf("key up (off), mod: %d, os_up_queued_used -> os_up_unqueued\n", mod);
-                    break;
-                default:
-                    break;
-                }
-            }
-        } else {
-            if (!is_oneshot_ignored_key(keycode)) {
-                // On non-ignored keyup, consider the oneshot used.
-                switch (*state) {
-                case os_down_unused:
-                    *state = os_down_used;
-                    dprintf("key up, mod: %d, os_down_unused -> os_down_used\n", mod);
-                    break;
-                case os_up_queued:
-                    *state = os_up_unqueued;
-                    unregister_code(mod);
-                    dprintf("key up (off), mod: %d, os_up_queued -> os_up_unqueued\n", mod);
-                    break;
-                case os_up_queued_used:
-                    *state = os_up_unqueued;
-                    unregister_code(mod);
-                    dprintf("key up (off), mod: %d, os_up_queued_used -> os_up_unqueued\n", mod);
-                    break;
-                default:
-                    break;
-                }
-            }
-        }
-    }
-}
-
-bool update_oneshot_layer(
-    oneshot_state *state,
-    uint16_t layer,
-    uint16_t trigger,
-    uint16_t keycode,
-    keyrecord_t *record
-) {
-    if (keycode == trigger) {
-        if (record->event.pressed) {
-            // Trigger keydown
-            if (*state == os_up_unqueued) {
-                layer_on(layer);
-            }
-            *state = os_down_unused;
-            dprintf("trigger down (on?), layer: %d, ? -> os_down_unused\n", layer);
-            return false;
-        } else {
-            // Trigger keyup
-            switch (*state) {
-            case os_down_unused:
-                // If we didn't use the layer while trigger was held, queue it.
-                *state = os_up_queued;
-                dprintf("trigger up, layer: %d, os_down_unused -> os_up_queued\n", layer);
-                return false;
-            case os_down_used:
-                // If we did use the layer while trigger was held, turn off it.
-                *state = os_up_unqueued;
-                layer_off(layer);
-                dprintf("trigger up (off), layer: %d, os_down_used -> os_up_unqueued\n", layer);
-                return false;
-            default:
-                break;
-            }
-        }
-    } else {
-        if (record->event.pressed) {
-            if (is_oneshot_layer_cancel_key(keycode) && *state != os_up_unqueued) {
-                // Cancel oneshot layer on designated cancel keydown.
-                *state = os_up_unqueued;
-                layer_off(layer);
-                dprintf("cancel (off), layer: %d, ? -> os_up_unqueued\n", layer);
-                return false;
-            }
-            uint8_t key_layer = read_source_layers_cache(record->event.key);
-            if (key_layer == layer) {
-                // On non-ignored keyup, consider the oneshot used.
-                switch (*state) {
-                case os_down_unused:
-                    *state = os_down_used;
-                    dprintf("key down, layer: %d, os_down_unused -> os_down_used\n", layer);
-                    return true;
-                case os_up_queued:
-                    if (is_oneshot_mod_key(keycode)) {
-                        *state = os_up_unqueued;
-                        layer_off(layer);
-                        dprintf("key down, layer: %d, os_up_queued -> os_up_unqueued\n", layer);
-                        return false;
-                    } else {
-                        *state = os_up_queued_used;
-                        dprintf("key down, layer: %d, os_up_queued -> os_up_queued_used\n", layer);
-                    }
-                    return true;
-               case os_up_queued_used:
-                    *state = os_up_unqueued;
-                    layer_off(layer);
-                    dprintf("key down (off), layer: %d, os_up_queued_used -> os_up_unqueued\n", layer);
-                    return false;
-                default:
-                    break;
-                }
-            }
-        } else {
-            // Ignore key ups from other layers
-            uint8_t key_layer = read_source_layers_cache(record->event.key);
-            if (key_layer == layer) {
-                // On non-ignored keyup, consider the oneshot used.
-                switch (*state) {
-                case os_up_queued:
-                    *state = os_up_unqueued;
-                    layer_off(layer);
-                    dprintf("key up (off), layer: %d, os_up_queued -> os_up_unqueued\n", layer);
-                    return true;
-                case os_up_queued_used:
-                    *state = os_up_unqueued;
-                    layer_off(layer);
-                    dprintf("key up (off), layer: %d, os_up_queued_used -> os_up_unqueued\n", layer);
-                    return true;
-                default:
-                    break;
-                }
-            }
-        }
-    }
-    return true;
-}
diff --git a/keyboards/a_dux/keymaps/daliusd/oneshot.h b/keyboards/a_dux/keymaps/daliusd/oneshot.h
deleted file mode 100644
index a4ea71b8a7..0000000000
--- a/keyboards/a_dux/keymaps/daliusd/oneshot.h
+++ /dev/null
@@ -1,65 +0,0 @@
-/* Copyright 2021 @daliusd
- *
- * 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/>.
- */
-#pragma once
-
-#include QMK_KEYBOARD_H
-
-// Represents the four states a oneshot key can be in
-typedef enum {
-    os_up_unqueued,
-    os_up_queued,
-    os_up_queued_used,
-    os_down_unused,
-    os_down_used,
-} oneshot_state;
-
-// Custom oneshot mod implementation that doesn't rely on timers. If a mod is
-// used while it is held it will be unregistered on keyup as normal, otherwise
-// it will be queued and only released after the next non-mod keyup.
-void update_oneshot(
-    oneshot_state *state,
-    uint16_t mod,
-    uint16_t trigger,
-    uint16_t keycode,
-    keyrecord_t *record
-);
-
-// Oneshot implementation for layers
-bool update_oneshot_layer(
-    oneshot_state *state,
-    uint16_t layer,
-    uint16_t trigger,
-    uint16_t keycode,
-    keyrecord_t *record
-);
-
-// To be implemented by the consumer. Layers one shot implementation needs to
-// know which keys are used as oneshot mods
-bool is_oneshot_mod_key(
-    uint16_t keycode
-);
-
-// To be implemented by the consumer. Defines keys to cancel oneshot mods.
-bool is_oneshot_cancel_key(uint16_t keycode);
-
-// To be implemented by the consumer. Defines keys to cancel oneshot layers.
-bool is_oneshot_layer_cancel_key(uint16_t keycode);
-
-// To be implemented by the consumer. Defines keys to ignore when determining
-// whether a oneshot mod has been used. Setting this to modifiers and layer
-// change keys allows stacking multiple oneshot modifiers, and carrying them
-// between layers.
-bool is_oneshot_ignored_key(uint16_t keycode);
diff --git a/keyboards/a_dux/keymaps/daliusd/readme.md b/keyboards/a_dux/keymaps/daliusd/readme.md
index f6e0efd0e8..fde19ee630 100644
--- a/keyboards/a_dux/keymaps/daliusd/readme.md
+++ b/keyboards/a_dux/keymaps/daliusd/readme.md
@@ -1,21 +1,306 @@
 # My 34 keys layout
 
-This are my principles for layout:
+This is my principles for layout:
 
 * I am using Callum style layout. Here you can read explanation by
   Callum himself and his reasoning for not using mod-tap:
   [here](../../../../users/callum/readme.md)
 
 * There should be only one way to type key. Key can be on
-  different layer but it must maintain its physical location.
+  different layer but it must maintain its physical location. I
+  broke this rule for Shift key only.
 
 * The less features are used the better.
 
-* trilayer is cool.
+* There is simple TMUX layer.
 
-* There is 🐍 key for no reason.
+* Common keys must be accessible using two keys if possible.
 
-As well I have added one shot layers compatible with Callum's one
-shot keys.
+* It should be possible to work with left keyboard side and mouse
+  in right hand without lifting hands for some scenarios (that's
+  why I had to duplicate Shift key).
 
-There is simple TMUX layer as well.
+## Improvements over Callum
+
+* I have added one shot layers compatible with Callum's one shot
+  keys.
+
+* There is one issue with accidental uppercase characters fixed
+  that exists in original Callum layout's implementation.
+
+* Another annoying feature of Callum layer is one shot keys are
+  frozen until you cancel them. This is problem when you use one
+  hand for keyboard and another for mouse. E.g. you click Ctrl and
+  mouse to get some menu (on Mac OS X), and then you want to click
+  some item in that menu. You have to remember to cancel one shot in such
+  situation. I have added two settings two handle situations like
+  this:
+
+  * `FLOW_ONESHOT_WAIT_TERM` - if hold one shot key longer than
+    `FLOW_ONESHOT_WAIT_TERM` ms then mod key / layer key is not
+    treated as one shot key (defaults to 500ms).
+
+  * `FLOW_ONESHOT_TERM` - if you do not click another key in
+  `FLOW_ONESHOT_TERM` ms then one shot key / layer key is treated
+  as normal key. Therefore if you lift it after `FLOW_ONESHOT_TERM`
+  it will not be treated as one shot (defaults to 500ms).
+
+  After adding those two settings I have found out that I don't
+  need one shot cancel key anymore so I have removed it.
+
+Since differences are significant I named this layout `flow`.
+
+## Using flow with your keyboard
+
+Copy `flow.c` and `flow.h` to keyboard folder.
+
+Add following line to `rules.mk`:
+
+```make
+SRC += flow.c
+```
+
+Define following in `config.h` for modifiers and layers:
+
+```c
+#define FLOW_COUNT 7
+#define FLOW_LAYERS_COUNT 3
+```
+
+In your `keymap.c` add and configure like this:
+
+```c
+#include "flow.h"
+
+...
+
+// flow_config should correspond to following format:
+// * layer keycode
+// * modifier keycode
+const uint16_t flow_config[FLOW_COUNT][2] = {
+    {L_NAV, KC_LALT},
+    {L_NAV, KC_LGUI},
+    {L_NAV, KC_LCTL},
+    {L_NAV, KC_LSFT},
+    {L_SYM, KC_LCTL},
+    {L_SYM, KC_LGUI},
+    {L_SYM, KC_LALT},
+};
+
+
+// for layers configuration follow this format:
+// * custom layer key
+// * layer name
+const uint16_t flow_layers_config[FLOW_LAYERS_COUNT][2] = {
+    {OS_TMUX, _TMUX},
+    {OS_MISC, _MISC},
+    {OS_FUNC, _FUNC},
+};
+
+...
+
+// Add following to handle flow
+
+bool process_record_user(uint16_t keycode, keyrecord_t *record) {
+    if (!update_flow(keycode, record->event.pressed, record->event.key)) return false;
+    return true;
+}
+
+void matrix_scan_user(void) {
+    flow_matrix_scan();
+}
+
+```
+
+## Lithuanian letters
+
+There are at least two ways how to enter Lithuanian letters: to
+use Unicode support from QMK or to switch OS language when
+necessary. Unicode support has some problems:
+
+* it is OS specific (you need to change Unicode input mode based
+  on your OS and I sometimes switch between Mac OS X and Ubuntu).
+  This is minor issue but it is still issue.
+
+* There is bug in Mac OS X and I can't enter `Š` using unicode
+  input method.
+
+* Unicode Hex Input in Mac OS X is not perfect and there are some
+  minor issue while using it.
+
+On Linux Unicode support meanwhile works perfectly.
+
+This leaves us with other option to use OS language switching as
+you most probably have done before. Still there is space for
+improvement. E.g. I have added Lithuanian letters to trilayer and
+trilayer activation toggles OS language (this works because I use
+only two languages). Check `layer_state_set_user` implementation
+for details.
+
+# Rejected ideas
+
+## Mods as combos
+
+Sometimes when I press `NAV (layer key) + S + Tab` to get `Command
++ Tab` I ended up with `S + Nav + Tab`. This happened because I
+did that really fast and sometimes clicked S slightly earlier than
+NAV layer key. Initially I have solved this problem using Combo
+keys, but that's additional dependency and combo keys are not
+ideal for Callum layer. You need to release both keys to trigger
+Combo key release. Therefore I have written custom code that
+allows pressing S some milliseconds earlier. This is controlled by
+FLOW_TERM and defaults to 10. I do not recommend setting this to
+higher than 30.
+
+This idea was rejected because it looks like 10ms did not made
+that big difference.
+
+## Swapper
+
+Idea of swapper is to have key that registers Mode key (e.g.
+Command while layer and some key is pressed) to simulate two key
+combo, e.g. Command + Tab. Overall I found that 3 keys combo that
+I have currently for swapping windows is equally good as 2 keys
+swapper. Another problem with swapper is that it is OS specific.
+Still if you want here is swapper implementation I have used:
+
+```c
+bool active;
+
+void update_swapper(
+    uint16_t trigger,
+    uint16_t keycode,
+    bool pressed
+) {
+    if (keycode == trigger) {
+        if (pressed) {
+            if (!active) {
+                active = true;
+                register_code(KC_LGUI);
+            }
+            register_code(KC_TAB);
+        } else {
+            unregister_code(KC_TAB);
+        }
+    } else if (active && keycode != KC_LSFT && keycode != KC_LEFT && keycode != KC_RIGHT) {
+        unregister_code(KC_LGUI);
+        active = false;
+    }
+}
+```
+
+## Combos
+
+I have seen that some people use two letter horizontal combos for
+some actions, e.g. XC for Command+C, CV for Command+V, JK for ESC
+and etc. I found that this kind of kicks me out of the flow when
+working as it requires different kind of action and I need to
+pause to make that action.
+
+## Comma-space
+
+I have noticed that I put space after comma `,` usually. That
+means I can use comma + letter for something else with backspace,
+e.g. for Lithuanian letters. Performance wise that works OK, but
+practically that does not feel really good. Trilayer with language
+layer switch works better.
+
+Still if you are interested here is comma-space implementation:
+
+```c
+void swap_layout(void) {
+    uint8_t saved_mods = get_mods();
+    clear_mods();
+    tap_code16(LCTL(KC_SPC));
+    set_mods(saved_mods);
+}
+
+void press_with_layout_swap(uint16_t keycode) {
+    tap_code16(KC_BSPC);
+    swap_layout();
+    tap_code16(keycode);
+    swap_layout();
+}
+
+bool comma_pressed = false;
+
+bool update_commaspace(
+    uint16_t keycode,
+    bool pressed
+) {
+    if (keycode == KC_COMM) {
+        if (!(get_mods() & MOD_MASK_SHIFT)) {
+            comma_pressed = true;
+        }
+    } else if (comma_pressed) {
+        if (keycode != KC_LSFT) {
+            comma_pressed = false;
+        }
+
+        switch(keycode) {
+            case KC_Q:
+                if (pressed) {
+                    press_with_layout_swap(KC_1);
+                    return false;
+                }
+                break;
+            case KC_W:
+                if (pressed) {
+                    press_with_layout_swap(KC_2);
+                    return false;
+                }
+                break;
+            case KC_E:
+                if (pressed) {
+                    press_with_layout_swap(KC_3);
+                    return false;
+                }
+                break;
+            case KC_R:
+                if (pressed) {
+                    press_with_layout_swap(KC_4);
+                    return false;
+                }
+                break;
+            case KC_T:
+                if (pressed) {
+                    press_with_layout_swap(KC_5);
+                    return false;
+                }
+                break;
+            case KC_Y:
+                if (pressed) {
+                    press_with_layout_swap(KC_6);
+                    return false;
+                }
+                break;
+            case KC_U:
+                if (pressed) {
+                    press_with_layout_swap(KC_7);
+                    return false;
+                }
+                break;
+            case KC_I:
+                if (pressed) {
+                    press_with_layout_swap(KC_8);
+                    return false;
+                }
+                break;
+            case KC_O:
+                if (pressed) {
+                    press_with_layout_swap(KC_EQL);
+                    return false;
+                }
+                break;
+        }
+    }
+
+    return true;
+};
+```
+
+## Using one shot layers on top layer keys (NAV and SYM)
+
+While this looked promising and fun it was really easy to get lost
+in which layer you actually are. You can still use it as `flow`
+supports this scenario, but I do not recommend it.
diff --git a/keyboards/a_dux/keymaps/daliusd/rules.mk b/keyboards/a_dux/keymaps/daliusd/rules.mk
index 0f203f004c..dda50a4f78 100644
--- a/keyboards/a_dux/keymaps/daliusd/rules.mk
+++ b/keyboards/a_dux/keymaps/daliusd/rules.mk
@@ -2,4 +2,4 @@ UNICODE_ENABLE = no
 UNICODEMAP_ENABLE = yes
 #CONSOLE_ENABLE = yes
 
-SRC += oneshot.c
+SRC += flow.c