Fix Caps Word capitalization when used with Combos + Auto Shift.

quantum/process_keycode/process_auto_shift.c

@@ -123,7 +123,12 @@ bool get_autoshift_shift_state(uint16_t keycode) {
 /** \brief Restores the shift key if it was cancelled by Auto Shift */
 static void autoshift_flush_shift(void) {
     autoshift_flags.holding_shift = false;
-    del_weak_mods(MOD_BIT(KC_LSFT));
+#    ifdef CAPS_WORD_ENABLE
+    if (!is_caps_word_on())
+#    endif // CAPS_WORD_ENABLE
+    {
+        del_weak_mods(MOD_BIT(KC_LSFT));
+    }
     if (autoshift_flags.cancelling_lshift) {
         autoshift_flags.cancelling_lshift = false;
         add_mods(MOD_BIT(KC_LSFT));

quantum/process_keycode/process_caps_word.c

@@ -131,7 +131,11 @@ bool process_caps_word(uint16_t keycode, keyrecord_t* record) {
 #endif // SWAP_HANDS_ENABLE
         }
 
+#ifdef AUTO_SHIFT_ENABLE
+        del_weak_mods(get_autoshift_state() ? ~MOD_BIT(KC_LSFT) : 0xff);
+#else
         clear_weak_mods();
+#endif // AUTO_SHIFT_ENABLE
         if (caps_word_press_user(keycode)) {
             send_keyboard_report();
             return true;

quantum/process_keycode/process_combo.c

@@ -227,7 +227,16 @@ static inline void dump_key_buffer(void) {
 #endif
         }
         record->event.time = 0;
+
+#if defined(CAPS_WORD_ENABLE) && defined(AUTO_SHIFT_ENABLE)
+        // Edge case: preserve the weak Left Shift mod if both Caps Word and
+        // Auto Shift are on. Caps Word capitalizes by setting the weak Left
+        // Shift mod during the press event, but Auto Shift doesn't send the
+        // key until it receives the release event.
+        del_weak_mods((is_caps_word_on() && get_autoshift_state()) ? ~MOD_BIT(KC_LSFT) : 0xff);
+#else
         clear_weak_mods();
+#endif // defined(CAPS_WORD_ENABLE) && defined(AUTO_SHIFT_ENABLE)
 
 #if TAP_CODE_DELAY > 0
         // only delay once and for a non-tapping key

tests/caps_word/caps_word_autoshift/test_caps_word_autoshift.cpp

@@ -19,6 +19,14 @@
 #include "test_fixture.hpp"
 #include "test_keymap_key.hpp"
 
+// Allow reports with no keys or only KC_LSFT.
+// clang-format off
+#define EXPECT_EMPTY_OR_LSFT(driver)              \
+    EXPECT_CALL(driver, send_keyboard_mock(AnyOf( \
+            KeyboardReport(),                     \
+            KeyboardReport(KC_LSFT))))
+// clang-format on
+
 using ::testing::_;
 using ::testing::AnyNumber;
 using ::testing::AnyOf;
@@ -39,13 +47,7 @@ TEST_F(CapsWord, AutoShiftKeys) {
     KeymapKey  key_spc(0, 1, 0, KC_SPC);
     set_keymap({key_a, key_spc});
 
-    // Allow any number of reports with no keys or only KC_LSFT.
-    // clang-format off
-    EXPECT_CALL(driver, send_keyboard_mock(AnyOf(
-                KeyboardReport(),
-                KeyboardReport(KC_LSFT))))
-        .Times(AnyNumber());
-    // clang-format on
+    EXPECT_EMPTY_OR_LSFT(driver).Times(AnyNumber());
     { // Expect: "A, A, space, a".
         InSequence s;
         EXPECT_REPORT(driver, (KC_LSFT, KC_A));
@@ -65,6 +67,46 @@ TEST_F(CapsWord, AutoShiftKeys) {
     testing::Mock::VerifyAndClearExpectations(&driver);
 }
 
+// Test Caps Word + Auto Shift where keys A and B are rolled.
+TEST_F(CapsWord, AutoShiftRolledShiftedKeys) {
+    TestDriver driver;
+    KeymapKey  key_a(0, 0, 0, KC_A);
+    KeymapKey  key_b(0, 0, 1, KC_B);
+    set_keymap({key_a, key_b});
+
+    EXPECT_EMPTY_OR_LSFT(driver).Times(AnyNumber());
+    { // Expect: "A, B, A, B".
+        InSequence s;
+        EXPECT_REPORT(driver, (KC_LSFT, KC_A));
+        EXPECT_REPORT(driver, (KC_LSFT, KC_B));
+        EXPECT_REPORT(driver, (KC_LSFT, KC_A));
+        EXPECT_REPORT(driver, (KC_LSFT, KC_B));
+    }
+
+    caps_word_on();
+
+    key_a.press(); // Overlapping taps: A down, B down, A up, B up.
+    run_one_scan_loop();
+    key_b.press();
+    run_one_scan_loop();
+    key_a.release();
+    run_one_scan_loop();
+    key_b.release();
+    run_one_scan_loop();
+
+    key_a.press(); // Nested taps: A down, B down, B up, A up.
+    run_one_scan_loop();
+    key_b.press();
+    run_one_scan_loop();
+    key_b.release();
+    run_one_scan_loop();
+    key_a.release();
+    run_one_scan_loop();
+
+    caps_word_off();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+}
+
 // Tests that with tap-hold keys with Retro Shift, letter keys are shifted by
 // Caps Word regardless of whether they are retroshifted.
 TEST_F(CapsWord, RetroShiftKeys) {
@@ -73,13 +115,7 @@ TEST_F(CapsWord, RetroShiftKeys) {
     KeymapKey  key_layertap_b(0, 1, 0, LT(1, KC_B));
     set_keymap({key_modtap_a, key_layertap_b});
 
-    // Allow any number of reports with no keys or only KC_LSFT.
-    // clang-format off
-    EXPECT_CALL(driver, send_keyboard_mock(AnyOf(
-                KeyboardReport(),
-                KeyboardReport(KC_LSFT))))
-        .Times(AnyNumber());
-    // clang-format on
+    EXPECT_EMPTY_OR_LSFT(driver).Times(AnyNumber());
     { // Expect: "B, A, B, A".
         InSequence s;
         EXPECT_REPORT(driver, (KC_LSFT, KC_B));

tests/caps_word/caps_word_combo/config.h

@@ -0,0 +1,20 @@
+// Copyright 2022 Google LLC
+//
+// 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 "test_common.h"
+
+#define TAPPING_TERM 200

tests/caps_word/caps_word_combo/test.mk

@@ -0,0 +1,19 @@
+# Copyright 2022 Google LLC
+#
+# 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/>.
+
+CAPS_WORD_ENABLE = yes
+COMBO_ENABLE = yes
+AUTO_SHIFT_ENABLE = yes
+

tests/caps_word/caps_word_combo/test_caps_word_combo.cpp

@@ -0,0 +1,212 @@
+// Copyright 2022 Google LLC
+//
+// 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/>.
+
+// Test Caps Word + Combos, with and without Auto Shift.
+
+#include <algorithm>
+#include <numeric>
+#include <vector>
+
+#include "keyboard_report_util.hpp"
+#include "keycode.h"
+#include "test_common.hpp"
+#include "test_fixture.hpp"
+#include "test_keymap_key.hpp"
+
+// Allow reports with no keys or only KC_LSFT.
+// clang-format off
+#define EXPECT_EMPTY_OR_LSFT(driver)              \
+    EXPECT_CALL(driver, send_keyboard_mock(AnyOf( \
+            KeyboardReport(),                     \
+            KeyboardReport(KC_LSFT))))
+// clang-format on
+
+using ::testing::AnyNumber;
+using ::testing::AnyOf;
+using ::testing::InSequence;
+using ::testing::TestParamInfo;
+
+extern "C" {
+// Define some combos to use for the test, including overlapping combos and
+// combos that chord tap-hold keys.
+enum combo_events { AB_COMBO, BC_COMBO, AD_COMBO, DE_COMBO, FGHI_COMBO, COMBO_LENGTH };
+uint16_t COMBO_LEN = COMBO_LENGTH;
+
+const uint16_t ab_combo[] PROGMEM   = {KC_A, KC_B, COMBO_END};
+const uint16_t bc_combo[] PROGMEM   = {KC_B, KC_C, COMBO_END};
+const uint16_t ad_combo[] PROGMEM   = {KC_A, LCTL_T(KC_D), COMBO_END};
+const uint16_t de_combo[] PROGMEM   = {LCTL_T(KC_D), LT(1, KC_E), COMBO_END};
+const uint16_t fghi_combo[] PROGMEM = {KC_F, KC_G, KC_H, KC_I, COMBO_END};
+
+// clang-format off
+combo_t key_combos[] = {
+    [AB_COMBO] = COMBO(ab_combo, KC_SPC),  // KC_A + KC_B = KC_SPC
+    [BC_COMBO] = COMBO(bc_combo, KC_X),    // KC_B + KC_C = KC_X
+    [AD_COMBO] = COMBO(ad_combo, KC_Y),    // KC_A + LCTL_T(KC_D) = KC_Y
+    [DE_COMBO] = COMBO(de_combo, KC_Z),    // LCTL_T(KC_D) + LT(1, KC_E) = KC_Z
+    [FGHI_COMBO] = COMBO(fghi_combo, KC_W) // KC_F + KC_G + KC_H + KC_I = KC_W
+};
+// clang-format on
+} // extern "C"
+
+namespace {
+
+// To test combos thorougly, we test them with pressing the chord keys with
+// a few different orders and timings.
+struct TestParams {
+    std::string name;
+    bool        autoshift_on;
+
+    static const std::string& GetName(const TestParamInfo<TestParams>& info) {
+        return info.param.name;
+    }
+};
+
+class CapsWord : public ::testing::WithParamInterface<TestParams>, public TestFixture {
+   public:
+    void SetUp() override {
+        caps_word_off();
+        if (GetParam().autoshift_on) {
+            autoshift_enable();
+        } else {
+            autoshift_disable();
+        }
+    }
+};
+
+// Test pressing the keys in a combo with different orders and timings.
+TEST_P(CapsWord, SingleCombo) {
+    TestDriver driver;
+    KeymapKey  key_b(0, 0, 1, KC_B);
+    KeymapKey  key_c(0, 0, 2, KC_C);
+    set_keymap({key_b, key_c});
+
+    EXPECT_EMPTY_OR_LSFT(driver).Times(AnyNumber());
+    EXPECT_REPORT(driver, (KC_LSFT, KC_X));
+
+    caps_word_on();
+    tap_combo({key_b, key_c});
+
+    EXPECT_TRUE(is_caps_word_on());
+    caps_word_off();
+
+    testing::Mock::VerifyAndClearExpectations(&driver);
+}
+
+// Test a longer 4-key combo.
+TEST_P(CapsWord, LongerCombo) {
+    TestDriver driver;
+    KeymapKey  key_f(0, 0, 0, KC_F);
+    KeymapKey  key_g(0, 0, 1, KC_G);
+    KeymapKey  key_h(0, 0, 2, KC_H);
+    KeymapKey  key_i(0, 0, 3, KC_I);
+    set_keymap({key_f, key_g, key_h, key_i});
+
+    EXPECT_EMPTY_OR_LSFT(driver).Times(AnyNumber());
+    EXPECT_REPORT(driver, (KC_LSFT, KC_W));
+
+    caps_word_on();
+    tap_combo({key_f, key_g, key_h, key_i});
+
+    EXPECT_TRUE(is_caps_word_on());
+    caps_word_off();
+
+    testing::Mock::VerifyAndClearExpectations(&driver);
+}
+
+// Test with two overlapping combos on regular keys:
+// KC_A + KC_B = KC_SPC,
+// KC_B + KC_C = KC_X.
+TEST_P(CapsWord, ComboRegularKeys) {
+    TestDriver driver;
+    KeymapKey  key_a(0, 0, 0, KC_A);
+    KeymapKey  key_b(0, 0, 1, KC_B);
+    KeymapKey  key_c(0, 0, 2, KC_C);
+    KeymapKey  key_1(0, 0, 3, KC_1);
+    set_keymap({key_a, key_b, key_c, key_1});
+
+    EXPECT_EMPTY_OR_LSFT(driver).Times(AnyNumber());
+    { // Expect: "A, B, 1, X, 1, C, space, a".
+        InSequence s;
+        EXPECT_REPORT(driver, (KC_LSFT, KC_A));
+        EXPECT_REPORT(driver, (KC_LSFT, KC_B));
+        EXPECT_REPORT(driver, (KC_1));
+        EXPECT_REPORT(driver, (KC_LSFT, KC_X));
+        EXPECT_REPORT(driver, (KC_1));
+        EXPECT_REPORT(driver, (KC_LSFT, KC_C));
+        EXPECT_REPORT(driver, (KC_SPC));
+        EXPECT_REPORT(driver, (KC_A));
+    }
+
+    caps_word_on();
+    tap_key(key_a);
+    tap_key(key_b);
+    tap_key(key_1);
+    tap_combo({key_b, key_c}); // BC combo types "x".
+    tap_key(key_1);
+    tap_key(key_c);
+    tap_combo({key_a, key_b}); // AB combo types space.
+    tap_key(key_a);
+
+    EXPECT_FALSE(is_caps_word_on());
+    testing::Mock::VerifyAndClearExpectations(&driver);
+}
+
+// Test where combo chords involve tap-hold keys:
+// KC_A + LCTL_T(KC_D) = KC_Y,
+// LCTL_T(KC_D) + LT(1, KC_E) = KC_Z,
+TEST_P(CapsWord, ComboModTapKey) {
+    TestDriver driver;
+    KeymapKey  key_a(0, 0, 0, KC_A);
+    KeymapKey  key_modtap_d(0, 0, 1, LCTL_T(KC_D));
+    KeymapKey  key_layertap_e(0, 0, 2, LT(1, KC_E));
+    set_keymap({key_a, key_modtap_d, key_layertap_e});
+
+    EXPECT_EMPTY_OR_LSFT(driver).Times(AnyNumber());
+    { // Expect: "A, D, E, Y, Z".
+        InSequence s;
+        EXPECT_REPORT(driver, (KC_LSFT, KC_A));
+        EXPECT_REPORT(driver, (KC_LSFT, KC_D));
+        EXPECT_REPORT(driver, (KC_LSFT, KC_E));
+        EXPECT_REPORT(driver, (KC_LSFT, KC_Y));
+        EXPECT_REPORT(driver, (KC_LSFT, KC_Z));
+    }
+
+    caps_word_on();
+    tap_key(key_a);
+    tap_key(key_modtap_d);
+    tap_key(key_layertap_e);
+    tap_combo({key_a, key_modtap_d});          // AD combo types "y".
+    tap_combo({key_modtap_d, key_layertap_e}); // DE combo types "z".
+
+    EXPECT_TRUE(is_caps_word_on());
+    caps_word_off();
+
+    testing::Mock::VerifyAndClearExpectations(&driver);
+}
+
+// clang-format off
+INSTANTIATE_TEST_CASE_P(
+    Combos,
+    CapsWord,
+    ::testing::Values(
+        TestParams{"AutoshiftDisabled", false},
+        TestParams{"AutoshiftEnabled", true}
+        ),
+    TestParams::GetName
+    );
+// clang-format on
+
+} // namespace