[Keymap] 🗺️ Adds massdrop/alt/favorable-mutation keymap (#6893)

Features:

* Tap space for space, hold for cmd
* Tap caps lock for esc, hold for ctrl
* Dedicated key for entering default mode of yabai window manager
* Who needs arrow keys, anyways???
* Method for clearing all stuck-down mods

keyboards/massdrop/alt/keymaps/favorable-mutation/README.md

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+### Massdrop Alt Layout
+
+This layout is for the [Massdrop Alt
+Keyboard](https://drop.com/buy/massdrop-alt-mechanical-keyboard)
+and targets MacOS machines.
+
+Some features:
+
+* Tap space for space, hold for cmd
+* Tap caps lock for esc, hold for ctrl
+* Dedicated key for entering default mode of [yabai window
+manager](https://github.com/koekeishiya/yabai)
+* Who needs arrow keys, anyways???
+* Method for clearing all stuck-down mods

keyboards/massdrop/alt/keymaps/favorable-mutation/config.h

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+/*
+Copyright 2019 Griffin Rademacher <contact@griffin-rademacher.info>
+
+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
+
+// toggle one-shot layer keys after this many presses
+#define ONESHOT_TAP_TOGGLE 3
+
+// set time held before Mod-Tap key sends mod code
+#define TAPPING_TERM 1000
+
+// permissive hold: if holding down a Mod-Tap key while pressing another, it
+// acts as a mod, even within the tapping term
+#define PERMISSIVE_HOLD

keyboards/massdrop/alt/keymaps/favorable-mutation/keymap.c

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+#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
+    HK_COSL,               //Clear held-down keys
+};
+
+#define TG_NKRO  MAGIC_TOGGLE_NKRO //Toggle 6KRO / NKRO mode
+#define CTL_ESC  LCTL_T(KC_ESC)
+#define TP_LSFT  OSM(MOD_LSFT)
+#define TP_RSFT  OSM(MOD_RSFT)
+#define TP_LALT  OSM(MOD_LALT)
+#define TP_RALT  OSM(MOD_RALT)
+#define KC_YBAI  LCTL(KC_SPC)
+#define GUI_SPC  LGUI_T(KC_SPC)
+#define KC_SPOT  LGUI(KC_SPC)
+
+//TODO default layer vim-like binds that work with WM, i to type??? this leads
+//to layers of vim modes - what's the best way to deal with that?
+//also need to deal with shift not working for other mods, add to shift layer
+//most likely
+//
+//TODO tap/toggle for layers
+
+keymap_config_t keymap_config;
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+    [0] = LAYOUT(
+        KC_GRV,  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_SPOT,
+        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,
+        CTL_ESC, 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_MUTE,
+        TP_LSFT, KC_Z,    KC_X,    KC_C,    KC_V,    KC_B,    KC_N,    KC_M,    KC_COMM, KC_DOT,  KC_SLSH, KC_RSFT,          KC_VOLU, KC_MPLY,
+        TP_LALT, TG(2),   KC_YBAI,                            GUI_SPC,                            TP_RALT, TG(1),   KC_MRWD, KC_VOLD, KC_MFFD
+    ),
+    [1] = LAYOUT(
+        KC_ESC,  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_DEL,
+        _______, RGB_SPD, RGB_VAI, RGB_SPI, RGB_HUI, RGB_SAI, _______, U_T_AUTO,U_T_AGCR,_______, KC_PSCR, KC_SLCK, KC_PAUS, _______, KC_HOME,
+        _______, RGB_RMOD,RGB_VAD, RGB_MOD, RGB_HUD, RGB_SAD, _______, KC_MRWD, KC_MFFD, _______, _______, _______,          _______, KC_PGUP,
+        _______, RGB_TOG, _______, _______, _______, MD_BOOT, TG_NKRO, DBG_TOG, _______, _______, _______, _______,          KC_UP,   KC_PGDN,
+        _______, _______, _______,                            HK_COSL,                            _______, TG(1),   KC_LEFT, KC_DOWN, KC_RGHT
+    ),
+    /*
+    [X] = LAYOUT(
+        _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,
+        _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,
+        _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,          _______, _______,
+        _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,          _______, _______,
+        _______, _______, _______,                            _______,                            _______, _______, _______, _______, _______
+    ),
+    */
+};
+
+// Runs just one time when the keyboard initializes.
+void matrix_init_user(void) {
+};
+
+// Runs constantly in the background, in a loop.
+void matrix_scan_user(void) {
+};
+
+#define MODS_SHIFT  (get_mods() & MOD_MASK_SHIFT)
+#define MODS_CTRL  (get_mods() & MOD_MASK_CTRL)
+#define MODS_ALT  (get_mods() & MOD_MASK_ALT)
+
+bool process_record_user(uint16_t keycode, keyrecord_t *record) {
+    static uint32_t key_timer;
+
+    switch (keycode) {
+        case HK_COSL:
+            clear_keyboard();
+            reset_oneshot_layer();
+            return true;
+        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
+    }
+}