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+/* Copyright 2022 elliotpatros
+ *
+ * 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 QMK_KEYBOARD_H
+
+// Layer definitions
+enum custom_layers {
+ _COLEMAK,
+ _FUNCTION,
+};
+
+// Custom keycodes, implemented later, in function: process_record_user()
+enum custom_keycodes {
+ CTL_ESC = SAFE_RANGE, // mod tap: left control / esc
+ SFT_ENT, // mod tap: left shift / enter
+ LST_PRN, // mod tap: left shift / left parenthesis
+ RST_PRN, // mod tap: right shift / right parenthesis
+};
+
+// Shorthand keycode definitions
+#define OSM_CAG OSM(MOD_LCTL | MOD_LALT | MOD_LGUI)
+#define LT_BSFN LT(_FUNCTION, KC_BSLS)
+
+// The layout
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+
+ // Default layer
+ [_COLEMAK] = 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_TAB, KC_Q, KC_W, KC_F, KC_P, KC_G, KC_J, KC_L, KC_U, KC_Y, KC_SCLN, KC_EQL,
+// ├────────┼────────┼────────┼────────┼────────┼────────┤ ├────────┼────────┼────────┼────────┼────────┼────────┤
+ CTL_ESC, KC_A, KC_R, KC_S, KC_T, KC_D, KC_H, KC_N, KC_E, KC_I, KC_O, KC_QUOT,
+// ├────────┼────────┼────────┼────────┼────────┼────────┼────────┐┌────────┼────────┼────────┼────────┼────────┼────────┼────────┤
+ LST_PRN, KC_Z, KC_X, KC_C, KC_V, KC_B, KC_SPC, KC_ENT, KC_K, KC_M, KC_COMM, KC_DOT, KC_SLSH, RST_PRN,
+// └────────┴────────┴────────┴────────┼────────┼────────┼────────┘└────────┼────────┴────────┴────────┴────────┴────────┴────────┘
+ KC_LALT, KC_LGUI, SFT_ENT, KC_SPC, LT_BSFN, KC_BSPC
+// └────────┴────────┴────────┘└────────┴────────┴────────┘
+ ),
+
+ // Function (and I guess also media & navigation) layer
+ [_FUNCTION] = LAYOUT (
+
+// ┌────────┬────────┬────────┬────────┬────────┬────────┐ ┌────────┬────────┬────────┬────────┬────────┬────────┐
+ _______, KC_F1, KC_F2, KC_F3, KC_F4, KC_F5, KC_F6, KC_F7, KC_F8, KC_F9, KC_F10, _______,
+// ├────────┼────────┼────────┼────────┼────────┼────────┤ ├────────┼────────┼────────┼────────┼────────┼────────┤
+ _______, KC_GRV, KC_LPRN, KC_RPRN, KC_F11, KC_F12, KC_INS, KC_HOME, KC_UP, KC_PGUP, _______, _______,
+// ├────────┼────────┼────────┼────────┼────────┼────────┤ ├────────┼────────┼────────┼────────┼────────┼────────┤
+ _______, KC_LCBR, KC_LBRC, KC_RBRC, KC_RCBR, OSM_CAG, KC_VOLU, KC_LEFT, KC_DOWN, KC_RGHT, KC_BSPC, _______,
+// ├────────┼────────┼────────┼────────┼────────┼────────┼────────┐┌────────┼────────┼────────┼────────┼────────┼────────┼────────┤
+ _______, _______, _______, _______, _______, KC_MUTE, _______, _______, KC_VOLD, KC_DEL, KC_END, KC_PGDN, _______, _______,
+// └────────┴────────┴────────┴────────┼────────┼────────┼────────┘└────────┼────────┴────────┴────────┴────────┴────────┴────────┘
+ _______, _______, _______, _______, _______, _______
+// └────────┴────────┴────────┘└────────┴────────┴────────┘
+ )
+
+};
+
+static inline bool dualfunckey_was_tapped(const uint16_t time_when_pressed) {
+ return timer_elapsed(time_when_pressed) < TAPPING_TERM;
+}
+
+bool process_record_user(uint16_t keycode, keyrecord_t* record) {
+
+ // Static variables
+ static uint16_t timer_control_escape = 0;
+ static uint16_t timer_shift_enter = 0;
+ static uint16_t timer_shift_lparen = 0;
+ static uint16_t timer_shift_rparen = 0;
+
+ static bool dualfunckey_pending = false;
+
+ static bool shift_enter_is_pressed = false;
+ static bool shift_lparen_is_pressed = false;
+
+ // Was this function called to handle a keydown? If not, it was called by a
+ // key up.
+ const bool pressed = record->event.pressed;
+
+ // Any keydown (at all) spends a pending dual function key check. Why? If,
+ // for example, you use shift to type a capital letter, and shift keys down
+ // and up faster than the tapping term, did you mean to call shift's tapping
+ // key? No. You just meant to call shift.
+ if (pressed) {
+ dualfunckey_pending = false;
+ }
+
+ // Only keycodes >= SAFE_RANGE are handled in this function
+ if (keycode < SAFE_RANGE) {
+ // This keypress was not handled
+ return true;
+ }
+
+ // Handle custom keypresses here
+ switch (keycode) {
+
+ // -------------------------------------------------------------------------
+ // Dual function key (hold: left shift; tap: enter)
+ // -------------------------------------------------------------------------
+ case SFT_ENT:
+
+ // There are multiple keys that are mapped to left shift. Keep track of
+ // which are pressed
+ shift_enter_is_pressed = pressed;
+
+ // Handle keypress routine
+ if (pressed) {
+
+ // The [left shift/enter] key was pressed
+ register_code(KC_LSFT);
+
+ // Save keydown time for checking hold/tap on keyup
+ timer_shift_enter = timer_read();
+
+ // Pressing a dual function key requires a hold/tap check on key up
+ dualfunckey_pending = true;
+
+ } else {
+
+ // The [left shift/enter] key was unpressed
+ // Note: unregister shift before pressing ENT so that ENT registers
+ // correctly
+
+ // If no other left shift keys are currently pressed, unregister it
+ if (! shift_lparen_is_pressed) {
+ unregister_code(KC_LSFT);
+ }
+
+ // If a pending dual function key hasn't been used yet, use it here
+ if (dualfunckey_pending && dualfunckey_was_tapped(timer_shift_enter)) {
+ tap_code(KC_ENT);
+ dualfunckey_pending = false;
+ }
+ }
+
+ // This keypress was handled
+ return false;
+
+ // -------------------------------------------------------------------------
+ // Dual function key (hold: left control; tap: escape)
+ // -------------------------------------------------------------------------
+ case CTL_ESC:
+
+ // Handle keypress routine
+ if (pressed) {
+
+ // Control/escape key was pressed
+ register_code(KC_LCTL);
+
+ // Save keydown time for checking hold/tap on keyup
+ timer_control_escape = timer_read();
+
+ // Pressing a dual function key requires a hold/tap check on key up
+ dualfunckey_pending = true;
+
+ } else {
+
+ // Control/escape key was unpressed
+ unregister_code(KC_LCTL);
+
+ // If a pending dual function key hasn't been used yet, use it here
+ if (dualfunckey_pending && dualfunckey_was_tapped(timer_control_escape)) {
+ tap_code(KC_ESC);
+ dualfunckey_pending = false;
+ }
+ }
+
+ // This keypress was handled
+ return false;
+
+ // -------------------------------------------------------------------------
+ // Dual function key (hold: left shift; tap: left parenthesis)
+ // -------------------------------------------------------------------------
+ case LST_PRN:
+
+ // There are multiple keys that are mapped to left shift. Keep track of
+ // which are pressed
+ shift_lparen_is_pressed = pressed;
+
+ // Handle keypress routine
+ if (pressed) {
+
+ // The [left shift/left parenthesis] key was pressed
+ register_code(KC_LSFT);
+
+ // Save keydown time for checking hold/tap on keyup
+ timer_shift_lparen = timer_read();
+
+ // Pressing a dual function key requires a hold/tap check on key up
+ dualfunckey_pending = true;
+
+ } else {
+
+ // The [left shift/left parenthesis] key was unpressed
+ // Note: unregister shift after tapping 9 so that left parenthesis
+ // registers correctly
+
+ // If a pending dual function key hasn't been used yet, use it here
+ if (dualfunckey_pending && dualfunckey_was_tapped(timer_shift_lparen)) {
+ tap_code(KC_9);
+ dualfunckey_pending = false;
+ }
+
+ // If no other left shift keys are currently pressed, unregister it
+ if (! shift_enter_is_pressed) {
+ unregister_code(KC_LSFT);
+ }
+ }
+
+ // This keypress was handled
+ return false;
+
+ // -------------------------------------------------------------------------
+ // Dual function key (hold: right shift; tap: right parenthesis)
+ // -------------------------------------------------------------------------
+ case RST_PRN:
+
+ // Handle keypress routine
+ if (pressed) {
+
+ // The [right shift/right parenthesis] key was pressed
+ register_code(KC_RSFT);
+
+ // Save keydown time for checking hold/tap on keyup
+ timer_shift_rparen = timer_read();
+
+ // Pressing a dual function key requires a hold/tap check on key up
+ dualfunckey_pending = true;
+
+ } else {
+
+ // The [right shift/right parenthesis] key was unpressed
+ // Note: unregister shift after tapping 0 so that right parenthesis
+ // registers correctly
+
+ // If a pending dual function key hasn't been used yet, use it here
+ if (dualfunckey_pending && dualfunckey_was_tapped(timer_shift_rparen)) {
+
+ // Space cadet shift: If the [left shift/left parenthesis] key
+ // is currently pressed, then tap the sequence ()
+ if (shift_lparen_is_pressed) {
+ tap_code(KC_9);
+ }
+
+ tap_code(KC_0);
+ dualfunckey_pending = false;
+ }
+
+ unregister_code(KC_RSFT);
+ }
+
+ // This keypress was handled
+ return false;
+
+ // -------------------------------------------------------------------------
+ // Some other key was pressed (this shouldn't happen)
+ // -------------------------------------------------------------------------
+ default:
+ // This keypress was not handled
+ return true;
+ }
+}