create users/datagrok (#7653)

* users/datagrok: add shared functions

* users/datagrok: improve base-layer selection feature

* users/datagrok: add README.md

1 files changed, 47 insertions, 0 deletions

diff --git a/users/datagrok/feature_cdeq.c b/users/datagrok/feature_cdeq.c
new file mode 100644
index 000000000..c1796ab22
--- /dev/null
+++ b/users/datagrok/feature_cdeq.c
@@ -0,0 +1,47 @@
+// This is a hack to place <question mark> on <shift-comma> and <exclamation
+// mark> on <shift-period>, when using an operating system configured for a
+// US/qwerty layout.
+//
+// cdeq = "comma dot exclamation question"
+
+#include QMK_KEYBOARD_H
+
+bool comm_shifted = false;
+bool ques_shifted = false;
+
+bool process_record_cdeq(uint16_t keycode, keyrecord_t *record) {
+  uint8_t shifted;
+  uint16_t s_keycode;
+  bool *k_shifted;
+
+  switch (keycode) {
+  case KC_COMM:
+    s_keycode = KC_SLSH;
+    k_shifted = &comm_shifted;
+    break;
+  case KC_DOT:
+    s_keycode = KC_1;
+    k_shifted = &ques_shifted;
+    break;
+  default:
+    return true;
+  }
+
+  shifted = get_mods() & (MOD_BIT(KC_LSHIFT)|MOD_BIT(KC_RSHIFT));
+
+  // Keydown. If shift is currently pressed, register its alternate keycode.
+  if (record->event.pressed && shifted) {
+    *k_shifted = true;
+    register_code(s_keycode);
+    return false;
+    // Keyup. If shift was pressed back when the key was pressed, unregister
+    // its alternate keycode.
+  } else if (!(record->event.pressed) && *k_shifted) {
+    *k_shifted = false;
+    unregister_code(s_keycode);
+    return false;
+    // Otherwise, behave as normal.
+  } else {
+    return true;
+  }
+}