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-rw-r--r--users/ericgebhart/caps_word.c81
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+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+//
+// For full documentation, see
+// https://getreuer.info/posts/keyboards/caps-word
+
+#include "caps_word.h"
+
+bool process_caps_word(uint16_t keycode, keyrecord_t* record) {
+ static bool caps_word_enabled = false;
+ static bool shifted = false;
+#ifndef NO_ACTION_ONESHOT
+ const uint8_t mods = get_mods() | get_oneshot_mods();
+#else
+ const uint8_t mods = get_mods();
+#endif // NO_ACTION_ONESHOT
+
+ if (!caps_word_enabled) {
+ // Pressing both shift keys at the same time enables caps word.
+ if ((mods & MOD_MASK_SHIFT) == MOD_MASK_SHIFT) {
+ clear_mods();
+#ifndef NO_ACTION_ONESHOT
+ clear_oneshot_mods();
+#endif // NO_ACTION_ONESHOT
+ shifted = false;
+ caps_word_enabled = true;
+ return false;
+ }
+ return true;
+ }
+
+ if (!record->event.pressed) { return true; }
+
+ if (!(mods & ~MOD_MASK_SHIFT)) {
+ switch (keycode) {
+ case QK_MOD_TAP ... QK_MOD_TAP_MAX:
+ case QK_LAYER_TAP ... QK_LAYER_TAP_MAX:
+ // Earlier return if this has not been considered tapped yet.
+ if (record->tap.count == 0) { return true; }
+ // Get the base tapping keycode of a mod- or layer-tap key.
+ keycode &= 0xff;
+ }
+
+ switch (keycode) {
+ // Letter keys should be shifted.
+ case KC_A ... KC_Z:
+ if (!shifted) { register_code(KC_LSFT); }
+ shifted = true;
+ return true;
+
+ // Keycodes that continue caps word but shouldn't get shifted.
+ case KC_1 ... KC_0:
+ case KC_BSPC:
+ case KC_MINS:
+ case KC_UNDS:
+ if (shifted) { unregister_code(KC_LSFT); }
+ shifted = false;
+ return true;
+
+ // Any other keycode disables caps word.
+ }
+ }
+
+ // Disable caps word.
+ caps_word_enabled = false;
+ if (shifted) { unregister_code(KC_LSFT); }
+ shifted = false;
+ return true;
+}