Keymap: Added Leader Key Functionality (#4025)

* deleting arkag branch, forcibly moving changes over to master

* fade_color function added, not tested

* added half functions some stuff

* surround_type function implemented and working.

* added flashing function and removed fading, flashing supports infinite flashing along with controlled number flashes

* added a fade state machine and functionality

* build optimizations, changed fade to bounce between bounds rather than roll over, added a HALMAK layout

* changes to sleep breath function, changed how I will switch to HALMAK

* support for halmak added

* support for activity detection added, condensed fading and flashing state machines, removed support for HALMAK and COLEMAK because arkag is stupid

* changed sleep and inactive behaviors, now the color shifting reverses on state change, yay! save_color and reset_color are made to enable layer color changing to look cooler.

* reformatted some if statements in state detection

* changes to force fade to pause on boot, or plug in.

* Attempting to move over to userspace, pushing to repository for help

* userspace stuff....

* userspace stuff....

* layout changes, working userspace,

Removed left side shift and replaced it with a MT() for LSFT and SPC. Userspace seems to be working properly now! HURRAY

* Layout change

Removed space/shift and reset modifiers to what they were originally. Added homerow modifiers.

* Removed excessive tabs in files

* Moved mods on homerow around...

* changes recommended by @drashna

* removed homerow mods, more flashy lighting!

* changed delays for lighting.

* velocikey code retro fit into userspace to match typing speed

currently "working" but isn't as reactive as I want.

* Readme and other documentation hidden throughout code

* Added a pretty picture

* pretty picture actually added

* More readme updates

* Velocikey now working inside my userspace!

* Changed repo macro and fixed readme

* Removed media layer, moved media control to LAZY layer

* fixed more merge issues when I had to merge...

* implemented some leader key stuff

* removed merge garbage...

* changes requested by @drashna, leader key switch from macros

5 files changed, 93 insertions, 142 deletions

diff --git a/keyboards/mechmini/v2/keymaps/arkag/config.h b/keyboards/mechmini/v2/keymaps/arkag/config.h
index f5f3a90fa7..e89adc0978 100644
--- a/keyboards/mechmini/v2/keymaps/arkag/config.h
+++ b/keyboards/mechmini/v2/keymaps/arkag/config.h
@@ -3,5 +3,5 @@
 // save me space!
 #define NO_ACTION_MACRO
 #define NO_ACTION_FUNCTION
-#define DISABLE_LEADER
+// #define DISABLE_LEADER
 #define NO_MUSIC_MODE
diff --git a/keyboards/mechmini/v2/keymaps/arkag/keymap.c b/keyboards/mechmini/v2/keymaps/arkag/keymap.c
index 7038f220c4..29e125394b 100644
--- a/keyboards/mechmini/v2/keymaps/arkag/keymap.c
+++ b/keyboards/mechmini/v2/keymaps/arkag/keymap.c
@@ -8,10 +8,10 @@
 
 const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
   [_QWERTY] = LAYOUT_2u_space_ortho(
-    KC_ESC,  KC_Q,    KC_W,    KC_E,    KC_R,    KC_T,    KC_Y,    KC_U,    KC_I,    KC_O,    KC_P,    KC_BSPC,
+    KC_LEAD, KC_Q,    KC_W,    KC_E,    KC_R,    KC_T,    KC_Y,    KC_U,    KC_I,    KC_O,    KC_P,    KC_BSPC,
     KC_TAB,  KC_A,    KC_S,    KC_D,    KC_F,    KC_G,    KC_H,    KC_J,    KC_K,    KC_L,    KC_SCLN, QUOTE,
     KC_LSFT, KC_Z,    KC_X,    KC_C,    KC_V,    KC_B,    KC_N,    KC_M,    KC_COMM, KC_DOT,  KC_UP,   KC_ENT,
-    M_PMOD,  LRALT,   M_SMOD,  LOWER,   RAISE,        KC_SPC,      KC_SLSH, LAZY,    KC_LEFT, KC_DOWN, KC_RGHT),
+    M_PMOD,  LRALT,   M_SMOD,  LOWER,   RAISE,        KC_SPC,      KC_SLSH, KC_BSLS, KC_LEFT, KC_DOWN, KC_RGHT),
 
   [_RAISE] = LAYOUT_2u_space_ortho(
     GRAVE,   KC_1,    KC_2,    THREE,   KC_4,    KC_5,    KC_6,    KC_7,    KC_8,    KC_9,    KC_0,    _______,
@@ -20,10 +20,10 @@ const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
     _______, _______, _______, KEEB,    _______,      _______,     _______, M_OS,    KC_PSLS, KC_PMNS, KC_PAST),
 
   [_LOWER] = LAYOUT_2u_space_ortho(
-    _______, _______, _______, _______, _______, _______, _______, M_ULIN,  M_ITAL,  _______, M_P_B,   M_C_A_D,
-    _______, _______, STRIKE,  _______, _______, _______, _______, _______, _______, _______, _______, _______,
-    KC_CAPS, KC_DEL,  _______, _______, _______, M_BOLD,  _______, _______, _______, _______, KC_PGUP, _______,
-    _______, _______, _______, _______, _______,      _______,     KC_BSLS, M_CALC,  KC_HOME, KC_PGDN, KC_END),
+    KC_ESC,  _______, _______, _______, _______, _______, _______, _______, _______, _______, M_P_B,   M_C_A_D,
+    _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,
+    KC_CAPS, KC_DEL,  _______, _______, _______, _______, _______, _______, _______, _______, KC_PGUP, _______,
+    _______, _______, _______, _______, _______,      _______,     _______, _______, KC_HOME, KC_PGDN, KC_END),
 
   [_KEEB] = LAYOUT_2u_space_ortho(
     KC_F1,   KC_F2,   KC_F3,   KC_F4,   KC_F5,   KC_F6,   KC_F7,   KC_F8,   KC_F9,   KC_F10,  KC_F11,  KC_F12,
@@ -35,5 +35,5 @@ const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
     _______, _______, _______, _______, _______, M_TM,    _______, M_SNIPT, M_SHRUG, _______, _______, KC_MUTE,
     _______, _______, _______, _______, _______, M_GGT,   _______, M_UF,    M_LOD,   M_REPO,  _______, _______,
     _______, _______, _______, _______, _______, _______, _______, M_TF,    M_LENNY, _______, KC_VOLU, KC_MPLY,
-    _______, _______, _______, _______, _______,      _______,     _______, _______, KC_MPRV, KC_VOLD, KC_MNXT),
+    _______, _______, _______, _______, _______,      _______,     M_CALC,  _______, KC_MPRV, KC_VOLD, KC_MNXT),
 };
diff --git a/keyboards/mechmini/v2/keymaps/arkag/rules.mk b/keyboards/mechmini/v2/keymaps/arkag/rules.mk
index d6c210e9e8..c1d5afa1eb 100644
--- a/keyboards/mechmini/v2/keymaps/arkag/rules.mk
+++ b/keyboards/mechmini/v2/keymaps/arkag/rules.mk
@@ -11,6 +11,7 @@ AUDIO_ENABLE = no
 RGBLIGHT_ENABLE = yes
 TAP_DANCE_ENABLE = yes
 UNICODE_ENABLE = yes
+LEADER_ENABLE = yes
 
 # save me space!
 EXTRAFLAGS += -flto
diff --git a/users/arkag/arkag.c b/users/arkag/arkag.c
index a35e13ed6b..212d06de67 100644
--- a/users/arkag/arkag.c
+++ b/users/arkag/arkag.c
@@ -370,115 +370,70 @@ void matrix_init_user(void) {
   set_os(current_os, false);
 }
 
+LEADER_EXTERNS();
+
 void matrix_scan_user(void) {
   check_state();
   flash_rgb();
   fade_rgb();
-}
-
-bool process_record_user(uint16_t keycode, keyrecord_t *record) {
-  switch (keycode) {
-  case M_PMOD:
-    if (record->event.pressed) {
-      pri_mod(true);
-    } else {
-      pri_mod(false);
-    }
-    return false;
+  LEADER_DICTIONARY() {
+    leading = false;
+    leader_end();
 
-  case M_SMOD:
-    if (record->event.pressed) {
-      sec_mod(true);
-    } else {
-      sec_mod(false);
-    }
-    return false;
-
-  case M_P_B:
-    if (record->event.pressed) {
+    // begin OS functions
+    SEQ_TWO_KEYS(KC_P, KC_B) {
       if (current_os == OS_WIN) {
               SEND_STRING(SS_DOWN(X_LGUI) SS_TAP(X_PAUSE) SS_UP(X_LGUI));
       } else {
       }
     }
-    return false;
-
-  case M_C_A_D:
-    if (record->event.pressed) {
+    SEQ_THREE_KEYS(KC_C, KC_A, KC_D) {
       if (current_os == OS_WIN) {
               SEND_STRING(SS_DOWN(X_LCTRL) SS_DOWN(X_LALT) SS_TAP(X_DELETE) SS_UP(X_LALT) SS_UP(X_LCTRL));
       } else {
       }
     }
-    return false;
-
-  case M_CALC:
-    if (record->event.pressed) {
+    SEQ_FOUR_KEYS(KC_C, KC_A, KC_L, KC_C) {
       if (current_os == OS_WIN) {
         SEND_STRING(SS_TAP(X_CALCULATOR));
       } else if (current_os == OS_MAC) {
         SEND_STRING(SS_DOWN(X_LGUI) SS_TAP(X_SPACE) SS_UP(X_LGUI) "calculator" SS_TAP(X_ENTER));
       }
     }
-    return false;
-
-  case M_OS:
-    if (record->event.pressed) {
-      set_os((current_os+1) % _OS_COUNT, true);
-    }
-    return false;
-
-  case M_LOD:
-    if (record->event.pressed) {
-      send_unicode_hex_string("0CA0 005F 005F 0CA0");
-    }
-    return false;
+    // end OS functions
 
-  case M_LENNY:
-    if (record->event.pressed) {
-      send_unicode_hex_string("0028 0020 0361 00B0 0020 035C 0296 0020 0361 00B0 0029");
+    // begin format functions
+    SEQ_ONE_KEY(KC_B) {
+      surround_type(4, KC_8, true);
     }
-    return false;
-
-
-  case M_TF:
-    if (record->event.pressed) {
-      send_unicode_hex_string("0028 256F 2035 0414 2032 0029 256F 5F61 253B 2501 253B");
+    SEQ_ONE_KEY(KC_I) {
+      surround_type(2, KC_8, true);
     }
-    return false;
-
-  case M_UF:
-    if (record->event.pressed) {
-      send_unicode_hex_string("252C 2500 252C 30CE 0028 0020 00BA 0020 005F 0020 00BA 0020 30CE 0029");
+    SEQ_ONE_KEY(KC_U) {
+      surround_type(4, KC_MINS, true);
     }
-    return false;
-
-  case M_SHRUG:
-    if (record->event.pressed) {
-      send_unicode_hex_string("00AF 005C 005F 0028 30C4 0029 005F 002F 00AF");
+    SEQ_ONE_KEY(KC_S) {
+      surround_type(4, KC_GRAVE, true);
     }
-    return false;
-
-  case M_TM:
-    if (record->event.pressed) {
-      send_unicode_hex_string("2122");
+    SEQ_TWO_KEYS(KC_S, KC_S) {
+      if (current_os == OS_MAC) {
+        long_keystroke(3, (uint16_t[]){KC_LGUI, KC_LSFT, KC_4});
+      } else if (current_os == OS_WIN) {
+        long_keystroke(3, (uint16_t[]){KC_LGUI, KC_LSFT, KC_S});
+      } else {
+        return;
+      }
     }
-    return false;
-
-  case M_REPO:
-    if (record->event.pressed) {
-      SEND_STRING("https://github.com/qmk/qmk_firmware/tree/master/users/arkag");
+    SEQ_ONE_KEY(KC_C) {
+      surround_type(2, KC_GRAVE, false);
     }
-    return false;
-
-  case M_GGT:
-    if (record->event.pressed) {
-      SEND_STRING("@GrahamGoldenTech.com");
+    SEQ_TWO_KEYS(KC_C, KC_C) {
+      surround_type(6, KC_GRAVE, false);
     }
-    return false;
+    // end format functions
 
-  case M_SNIPT:
-    if (record->event.pressed) {
+    // start fancy functions
+    SEQ_THREE_KEYS(KC_C, KC_C, KC_C) {
       surround_type(6, KC_GRAVE, false);
       pri_mod(true);
       tap_key(KC_V);
@@ -488,44 +443,68 @@ bool process_record_user(uint16_t keycode, keyrecord_t *record) {
       tap_key(KC_RGHT);
       tap_key(KC_ENTER);
     }
-    return false;
+    // end fancy functions
 
-  case M_BOLD:
-    if (record->event.pressed) {
-      surround_type(4, KC_8, true);
+    // start typing functions
+    SEQ_TWO_KEYS(KC_T, KC_M) {
+      // ™
+      send_unicode_hex_string("2122");
     }
-    return false;
+    SEQ_THREE_KEYS(KC_G, KC_G, KC_T) {
+      SEND_STRING("@GrahamGoldenTech.com");
+    }
+    SEQ_THREE_KEYS(KC_L, KC_O, KC_D) {
+      // ಠ__ಠ
+      send_unicode_hex_string("0CA0 005F 005F 0CA0");
+    }
+    SEQ_FOUR_KEYS(KC_R, KC_E, KC_P, KC_O) {
+      SEND_STRING("https://github.com/qmk/qmk_firmware/tree/master/users/arkag");
+    }
+    SEQ_FOUR_KEYS(KC_F, KC_L, KC_I, KC_P) {
+      // (╯‵Д′)╯彡┻━┻
+      send_unicode_hex_string("0028 256F 2035 0414 2032 0029 256F 5F61 253B 2501 253B");
+    }
+    SEQ_FIVE_KEYS(KC_U, KC_F, KC_L, KC_I, KC_P) {
+      // ┬─┬ノ( º _ º ノ)
+      send_unicode_hex_string("252C 2500 252C 30CE 0028 0020 00BA 0020 005F 0020 00BA 0020 30CE 0029");
+    }
+    SEQ_FIVE_KEYS(KC_L, KC_E, KC_N, KC_N, KC_Y) {
+      // ( ͡° ͜ʖ ͡°)
+      send_unicode_hex_string("0028 0020 0361 00B0 0020 035C 0296 0020 0361 00B0 0029");
+    }
+    SEQ_FIVE_KEYS(KC_S, KC_H, KC_R, KC_U, KC_G) {
+      // ¯\_(ツ)_/¯
+      send_unicode_hex_string("00AF 005C 005F 0028 30C4 0029 005F 002F 00AF");
+    }
+    // end typing functions
 
-  case M_ITAL:
+  }
+}
+
+bool process_record_user(uint16_t keycode, keyrecord_t *record) {
+  switch (keycode) {
+  case M_PMOD:
     if (record->event.pressed) {
-      surround_type(2, KC_8, true);
+      pri_mod(true);
+    } else {
+      pri_mod(false);
     }
     return false;
 
-  case M_ULIN:
+  case M_SMOD:
     if (record->event.pressed) {
-      surround_type(4, KC_MINS, true);
+      sec_mod(true);
+    } else {
+      sec_mod(false);
     }
     return false;
 
-  case KC_LSFT:
+  case M_OS:
     if (record->event.pressed) {
-      save_color(underglow);
-      underglow = mod_color(underglow, true, 75);
-      SEND_STRING(SS_DOWN(X_LSHIFT));
-    } else {
-      reset_color();
-      SEND_STRING(SS_UP(X_LSHIFT));
+      set_os((current_os+1) % _OS_COUNT, true);
     }
     return false;
 
-  case MEDIA:
-  case LAZY:
-  case KEEB:
-  case RAISE:
-  case LOWER:
-    return true;
-
   default:
     if (record->event.pressed) {
       state = active;
@@ -535,36 +514,6 @@ bool process_record_user(uint16_t keycode, keyrecord_t *record) {
   }
 }
 
-uint32_t layer_state_set_user(uint32_t state) {
-  switch (biton32(state)) {
-  case _LAZY:
-    save_color(underglow);
-    underglow = mod_color(underglow, true, 50);
-    break;
-  case _MEDIA:
-    save_color(underglow);
-    underglow = mod_color(underglow, true, 150);
-    break;
-  case _KEEB:
-    save_color(underglow);
-    underglow = mod_color(underglow, false, 150);
-    break;
-  case _LOWER:
-    save_color(underglow);
-    underglow = mod_color(underglow, false, 100);
-    break;
-  case _RAISE:
-    save_color(underglow);
-    underglow = mod_color(underglow, true, 100);
-    break;
-  default:
-    reset_color();
-    break;
-  }
-  set_color(underglow, false);
-  return state;
-}
-
 //Tap Dance Definitions
 qk_tap_dance_action_t tap_dance_actions[] = {
   [TD_3_GRV_ACT]      = ACTION_TAP_DANCE_FN (dance_3),
diff --git a/users/arkag/config.h b/users/arkag/config.h
index e715e5534e..2e0a9ad019 100644
--- a/users/arkag/config.h
+++ b/users/arkag/config.h
@@ -1,5 +1,6 @@
 #pragma once
 
-#define TAPPING_TERM                200
+#define TAPPING_TERM    200
+#define LEADER_TIMEOUT  250
 
-#define IGNORE_MOD_TAP_INTERRUPT
+#define LEADER_PER_KEY_TIMING