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/* Copyright 2017 Jeremy Cowgar
*
* 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/>.
*/
#ifdef AUTO_SHIFT_ENABLE
# include <stdbool.h>
# include <stdio.h>
# include "process_auto_shift.h"
static uint16_t autoshift_time = 0;
static uint16_t autoshift_timeout = AUTO_SHIFT_TIMEOUT;
static uint16_t autoshift_lastkey = KC_NO;
static struct {
// Whether autoshift is enabled.
bool enabled : 1;
// Whether the last auto-shifted key was released after the timeout. This
// is used to replicate the last key for a tap-then-hold.
bool lastshifted : 1;
// Whether an auto-shiftable key has been pressed but not processed.
bool in_progress : 1;
// Whether the auto-shifted keypress has been registered.
bool holding_shift : 1;
} autoshift_flags = {true, false, false, false};
/** \brief Record the press of an autoshiftable key
*
* \return Whether the record should be further processed.
*/
static bool autoshift_press(uint16_t keycode, uint16_t now, keyrecord_t *record) {
if (!autoshift_flags.enabled) {
return true;
}
# ifndef AUTO_SHIFT_MODIFIERS
if (get_mods() & (~MOD_BIT(KC_LSFT))) {
return true;
}
# endif
# ifdef AUTO_SHIFT_REPEAT
const uint16_t elapsed = TIMER_DIFF_16(now, autoshift_time);
# ifndef AUTO_SHIFT_NO_AUTO_REPEAT
if (!autoshift_flags.lastshifted) {
# endif
if (elapsed < TAPPING_TERM && keycode == autoshift_lastkey) {
// Allow a tap-then-hold for keyrepeat.
if (!autoshift_flags.lastshifted) {
register_code(autoshift_lastkey);
} else {
// Simulate pressing the shift key.
add_weak_mods(MOD_BIT(KC_LSFT));
register_code(autoshift_lastkey);
}
return false;
}
# ifndef AUTO_SHIFT_NO_AUTO_REPEAT
}
# endif
# endif
// Record the keycode so we can simulate it later.
autoshift_lastkey = keycode;
autoshift_time = now;
autoshift_flags.in_progress = true;
# if !defined(NO_ACTION_ONESHOT) && !defined(NO_ACTION_TAPPING)
clear_oneshot_layer_state(ONESHOT_OTHER_KEY_PRESSED);
# endif
return false;
}
/** \brief Registers an autoshiftable key under the right conditions
*
* If the autoshift delay has elapsed, register a shift and the key.
*
* If the autoshift key is released before the delay has elapsed, register the
* key without a shift.
*/
static void autoshift_end(uint16_t keycode, uint16_t now, bool matrix_trigger) {
// Called on key down with KC_NO, auto-shifted key up, and timeout.
if (autoshift_flags.in_progress) {
// Process the auto-shiftable key.
autoshift_flags.in_progress = false;
// Time since the initial press was recorded.
const uint16_t elapsed = TIMER_DIFF_16(now, autoshift_time);
if (elapsed < autoshift_timeout) {
register_code(autoshift_lastkey);
autoshift_flags.lastshifted = false;
} else {
// Simulate pressing the shift key.
add_weak_mods(MOD_BIT(KC_LSFT));
register_code(autoshift_lastkey);
autoshift_flags.lastshifted = true;
# if defined(AUTO_SHIFT_REPEAT) && !defined(AUTO_SHIFT_NO_AUTO_REPEAT)
if (matrix_trigger) {
// Prevents release.
return;
}
# endif
}
# if TAP_CODE_DELAY > 0
wait_ms(TAP_CODE_DELAY);
# endif
unregister_code(autoshift_lastkey);
del_weak_mods(MOD_BIT(KC_LSFT));
} else {
// Release after keyrepeat.
unregister_code(keycode);
if (keycode == autoshift_lastkey) {
// This will only fire when the key was the last auto-shiftable
// pressed. That prevents aaaaBBBB then releasing a from unshifting
// later Bs (if B wasn't auto-shiftable).
del_weak_mods(MOD_BIT(KC_LSFT));
}
}
send_keyboard_report(); // del_weak_mods doesn't send one.
// Roll the autoshift_time forward for detecting tap-and-hold.
autoshift_time = now;
}
/** \brief Simulates auto-shifted key releases when timeout is hit
*
* Can be called from \c matrix_scan_user so that auto-shifted keys are sent
* immediately after the timeout has expired, rather than waiting for the key
* to be released.
*/
void autoshift_matrix_scan(void) {
if (autoshift_flags.in_progress) {
const uint16_t now = timer_read();
const uint16_t elapsed = TIMER_DIFF_16(now, autoshift_time);
if (elapsed >= autoshift_timeout) {
autoshift_end(autoshift_lastkey, now, true);
}
}
}
void autoshift_toggle(void) {
autoshift_flags.enabled = !autoshift_flags.enabled;
del_weak_mods(MOD_BIT(KC_LSFT));
}
void autoshift_enable(void) { autoshift_flags.enabled = true; }
void autoshift_disable(void) {
autoshift_flags.enabled = false;
del_weak_mods(MOD_BIT(KC_LSFT));
}
# ifndef AUTO_SHIFT_NO_SETUP
void autoshift_timer_report(void) {
char display[8];
snprintf(display, 8, "\n%d\n", autoshift_timeout);
send_string((const char *)display);
}
# endif
bool get_autoshift_state(void) { return autoshift_flags.enabled; }
uint16_t get_autoshift_timeout(void) { return autoshift_timeout; }
void set_autoshift_timeout(uint16_t timeout) { autoshift_timeout = timeout; }
bool process_auto_shift(uint16_t keycode, keyrecord_t *record) {
// Note that record->event.time isn't reliable, see:
// https://github.com/qmk/qmk_firmware/pull/9826#issuecomment-733559550
const uint16_t now = timer_read();
if (record->event.pressed) {
if (autoshift_flags.in_progress) {
// Evaluate previous key if there is one. Doing this elsewhere is
// more complicated and easier to break.
autoshift_end(KC_NO, now, false);
}
// For pressing another key while keyrepeating shifted autoshift.
del_weak_mods(MOD_BIT(KC_LSFT));
switch (keycode) {
case KC_ASTG:
autoshift_toggle();
return true;
case KC_ASON:
autoshift_enable();
return true;
case KC_ASOFF:
autoshift_disable();
return true;
# ifndef AUTO_SHIFT_NO_SETUP
case KC_ASUP:
autoshift_timeout += 5;
return true;
case KC_ASDN:
autoshift_timeout -= 5;
return true;
case KC_ASRP:
autoshift_timer_report();
return true;
# endif
}
}
switch (keycode) {
# ifndef NO_AUTO_SHIFT_ALPHA
case KC_A ... KC_Z:
# endif
# ifndef NO_AUTO_SHIFT_NUMERIC
case KC_1 ... KC_0:
# endif
# ifndef NO_AUTO_SHIFT_SPECIAL
case KC_TAB:
case KC_MINUS ... KC_SLASH:
case KC_NONUS_BSLASH:
# endif
if (record->event.pressed) {
return autoshift_press(keycode, now, record);
} else {
autoshift_end(keycode, now, false);
return false;
}
}
return true;
}
#endif
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