Keymap: Add Contra keymap with QWERTY and COLEMAK Mod-DH (#3883)

* Add own personal Contra layout

* Enable auto-shifting

* Enable tap dancing and implement Space Cadet-like shift with LSHIFT and ENTER

* Implement Colemak Mod-DH layout, clean up Adjust layer

* Implement keyboard and keymap refactor

More info: https://github.com/qmk/qmk_firmware/pull/3191

* Update the readme.md and keymap.c files for Colemak

* Add include guard, make layout description cleaner

4 files changed, 248 insertions, 0 deletions

diff --git a/keyboards/contra/keymaps/erovia/config.h b/keyboards/contra/keymaps/erovia/config.h
new file mode 100644
index 0000000000..11d6a2c1ae
--- /dev/null
+++ b/keyboards/contra/keymaps/erovia/config.h
@@ -0,0 +1,7 @@
+#pragma once
+
+#define AUTO_SHIFT_TIMEOUT 150
+#define NO_AUTO_SHIFT_SPECIAL
+#define NO_AUTO_SHIFT_NUMERIC
+
+#define TAPPING_TERM 200
diff --git a/keyboards/contra/keymaps/erovia/keymap.c b/keyboards/contra/keymaps/erovia/keymap.c
new file mode 100644
index 0000000000..9b72e57332
--- /dev/null
+++ b/keyboards/contra/keymaps/erovia/keymap.c
@@ -0,0 +1,163 @@
+#include QMK_KEYBOARD_H
+
+extern keymap_config_t keymap_config;
+
+enum planck_layers {
+  _QWERTY,
+  _COLEMAK,
+  _LOWER,
+  _RAISE,
+  _ADJUST
+};
+
+enum planck_keycodes {
+  QWERTY = SAFE_RANGE,
+  COLEMAK,
+  LOWER,
+  RAISE
+};
+
+enum {
+  TD_SPACE_CADET_SHIFT = 0,
+  TD_SPACE_CADET_ENTER = 1
+};
+
+qk_tap_dance_action_t tap_dance_actions[] = {
+  [TD_SPACE_CADET_SHIFT] = ACTION_TAP_DANCE_DOUBLE(KC_LSFT, KC_LPRN),
+  [TD_SPACE_CADET_ENTER] = ACTION_TAP_DANCE_DOUBLE(KC_ENT, KC_RPRN)
+};
+
+#define TD_SHFT TD(TD_SPACE_CADET_SHIFT)
+#define TD_ENTR TD(TD_SPACE_CADET_ENTER)
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+
+/* Qwerty
+ * ,-----------------------------------------------------------------------------------.
+ * | `    |   Q  |   W  |   E  |   R  |   T  |   Y  |   U  |   I  |   O  |   P  | Bksp |
+ * |------+------+------+------+------+-------------+------+------+------+------+------|
+ * | Esc  |   A  |   S  |   D  |   F  |   G  |   H  |   J  |   K  |   L  |   ;  |  '   |
+ * |------+------+------+------+------+------|------+------+------+------+------+------|
+ * | Shift|   Z  |   X  |   C  |   V  |   B  |   N  |   M  |   ,  |   .  |   /  |Enter |
+ * |------+------+------+------+------+------+------+------+------+------+------+------|
+ * | Ctrl | GUI  | Alt  | GUI  |Lower | Tab  |Space |Raise | Left | Down |  Up  |Right |
+ * `-----------------------------------------------------------------------------------'
+ */
+[_QWERTY] = LAYOUT_ortho_4x12(
+  KC_GRV,  KC_Q,   KC_W,    KC_E,    KC_R,    KC_T,    KC_Y,    KC_U,    KC_I,    KC_O,    KC_P,    KC_BSPC,
+  KC_ESC, KC_A,   KC_S,    KC_D,    KC_F,    KC_G,    KC_H,    KC_J,    KC_K,    KC_L,    KC_SCLN, KC_QUOT,
+  TD_SHFT, KC_Z,   KC_X,    KC_C,    KC_V,    KC_B,    KC_N,    KC_M,    KC_COMM, KC_DOT,  KC_SLSH, TD_ENTR,
+  KC_LCTL,  KC_LGUI, KC_LALT, KC_LGUI, LOWER,   KC_TAB,  KC_SPC,  RAISE,   KC_LEFT, KC_DOWN, KC_UP,   KC_RGHT
+),
+
+/* Colemak
+ * ,-----------------------------------------------------------------------------------.
+ * | `    |   Q  |   W  |   F  |   P  |   B  |   J  |   L  |   U  |   Y  |   ;  | Bksp |
+ * |------+------+------+------+------+-------------+------+------+------+------+------|
+ * | Ctrl |   A  |   R  |   S  |   T  |   G  |   M  |   N  |   E  |   I  |   O  |  '   |
+ * |------+------+------+------+------+------|------+------+------+------+------+------|
+ * | Shift|   Z  |   X  |   C  |   D  |   V  |   K  |   H  |   ,  |   .  |   /  |Enter |
+ * |------+------+------+------+------+------+------+------+------+------+------+------|
+ * | Ctrl | GUI  | Alt  | GUI  |Lower | Tab  |Space |Raise | Left | Down |  Up  |Right |
+ * `-----------------------------------------------------------------------------------'
+ */
+[_COLEMAK] = LAYOUT_ortho_4x12(
+  KC_GRV,  KC_Q,   KC_W,    KC_F,    KC_P,    KC_B,    KC_J,    KC_L,    KC_U,    KC_Y,    KC_SCLN, KC_BSPC,
+  KC_ESC, KC_A,   KC_R,    KC_S,    KC_T,    KC_G,    KC_M,    KC_N,    KC_E,    KC_I,    KC_O,    KC_QUOT,
+  TD(TD_SPACE_CADET_SHIFT), KC_Z,   KC_X,    KC_C,    KC_D,    KC_V,    KC_K,    KC_H,    KC_COMM, KC_DOT,  KC_SLSH, TD(TD_SPACE_CADET_ENTER),
+  KC_LCTL,  KC_LGUI, KC_LALT, KC_LGUI, LOWER,   KC_TAB,  KC_SPC,  RAISE,   KC_LEFT, KC_DOWN, KC_UP,   KC_RGHT
+),
+
+/* Lower
+ * ,-----------------------------------------------------------------------------------.
+ * |   ~  |   !  |   @  |   #  |   $  |   %  |   ^  |   &  |   *  |   (  |   )  | Bksp |
+ * |------+------+------+------+------+-------------+------+------+------+------+------|
+ * | Del  |  F1  |  F2  |  F3  |  F4  |  F5  |  F6  |   _  |   +  |   {  |   }  |  |   |
+ * |------+------+------+------+------+------|------+------+------+------+------+------|
+ * |      |  F7  |  F8  |  F9  |  F10 |  F11 |  F12 |ISO ~ |ISO | | Home | End  |      |
+ * |------+------+------+------+------+------+------+------+------+------+------+------|
+ * |      |      |      |      |      |             |      | Next | Vol- | Vol+ | Play |
+ * `-----------------------------------------------------------------------------------'
+ */
+[_LOWER] = LAYOUT_ortho_4x12(
+  KC_TILD, KC_EXLM, KC_AT,   KC_HASH, KC_DLR,  KC_PERC, KC_CIRC, KC_AMPR,    KC_ASTR,    KC_LPRN, KC_RPRN, KC_BSPC,
+  KC_DEL,  KC_F1,   KC_F2,   KC_F3,   KC_F4,   KC_F5,   KC_F6,   KC_UNDS,    KC_PLUS,    KC_LCBR, KC_RCBR, KC_PIPE,
+  _______, KC_F7,   KC_F8,   KC_F9,   KC_F10,  KC_F11,  KC_F12,  S(KC_NUHS), S(KC_NUBS), KC_HOME, KC_END,  _______,
+  _______, _______, _______, _______, _______, _______, _______, _______,    KC_MNXT,    KC_VOLD, KC_VOLU, KC_MPLY
+),
+
+/* Raise
+ * ,-----------------------------------------------------------------------------------.
+ * |   `  |   1  |   2  |   3  |   4  |   5  |   6  |   7  |   8  |   9  |   0  | Bksp |
+ * |------+------+------+------+------+-------------+------+------+------+------+------|
+ * | Del  |  F1  |  F2  |  F3  |  F4  |  F5  |  F6  |   -  |   =  |   [  |   ]  |  \   |
+ * |------+------+------+------+------+------|------+------+------+------+------+------|
+ * |      |  F7  |  F8  |  F9  |  F10 |  F11 |  F12 |ISO # |ISO / |Pg Up |Pg Dn |      |
+ * |------+------+------+------+------+------+------+------+------+------+------+------|
+ * |      |      |      |      |      |             |      | Prev | Vol- | Mute | Stop |
+ * `-----------------------------------------------------------------------------------'
+ */
+[_RAISE] = LAYOUT_ortho_4x12(
+  KC_GRV,  KC_1,    KC_2,    KC_3,    KC_4,    KC_5,    KC_6,    KC_7,    KC_8,    KC_9,    KC_0,    KC_BSPC,
+  KC_DEL,  KC_F1,   KC_F2,   KC_F3,   KC_F4,   KC_F5,   KC_F6,   KC_MINS, KC_EQL,  KC_LBRC, KC_RBRC, KC_BSLS,
+  _______, KC_F7,   KC_F8,   KC_F9,   KC_F10,  KC_F11,  KC_F12,  KC_NUHS, KC_NUBS, KC_PGUP, KC_PGDN, _______,
+  _______, _______, _______, _______, _______, _______, _______, _______, KC_MPRV, KC_VOLD, KC_MUTE, KC_MSTP
+),
+
+/* Adjust (Lower + Raise)
+ * ,-----------------------------------------------------------------------------------.
+ * |      |      |      |      |      |      |      |      |      |      |      |      |
+ * |------+------+------+------+------+-------------+------+------+------+------+------|
+ * |      |      |      |      |      |      |      |Qwerty|Colemk|      |      |      |
+ * |------+------+------+------+------+------|------+------+------+------+------+------|
+ * |      |      |      |      |      |      |      |      |      |      |      |      |
+ * |------+------+------+------+------+------+------+------+------+------+------+------|
+ * |      |      |      |      |      |             |      |      |      |      | AuSh |
+ * `-----------------------------------------------------------------------------------'
+ */
+[_ADJUST] = LAYOUT_ortho_4x12(
+  _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,
+  _______, _______, _______, _______, _______, _______, _______, QWERTY,  COLEMAK, _______, _______, _______,
+  _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,
+  _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, KC_ASTG
+)
+
+};
+
+bool process_record_user(uint16_t keycode, keyrecord_t *record) {
+  switch (keycode) {
+    case QWERTY:
+      if (record->event.pressed) {
+        set_single_persistent_default_layer(_QWERTY);
+      }
+      return false;
+      break;
+    case COLEMAK:
+      if (record->event.pressed) {
+        set_single_persistent_default_layer(_COLEMAK);
+      }
+      return false;
+      break;
+    case LOWER:
+      if (record->event.pressed) {
+        layer_on(_LOWER);
+        update_tri_layer(_LOWER, _RAISE, _ADJUST);
+      } else {
+        layer_off(_LOWER);
+        update_tri_layer(_LOWER, _RAISE, _ADJUST);
+      }
+      return false;
+      break;
+    case RAISE:
+      if (record->event.pressed) {
+        layer_on(_RAISE);
+        update_tri_layer(_LOWER, _RAISE, _ADJUST);
+      } else {
+        layer_off(_RAISE);
+        update_tri_layer(_LOWER, _RAISE, _ADJUST);
+      }
+      return false;
+      break;
+  }
+  return true;
+}
diff --git a/keyboards/contra/keymaps/erovia/readme.md b/keyboards/contra/keymaps/erovia/readme.md
new file mode 100644
index 0000000000..34cbdf0a18
--- /dev/null
+++ b/keyboards/contra/keymaps/erovia/readme.md
@@ -0,0 +1,76 @@
+# Erovia's Contra Keymap
+
+My personal Contra keymap based on the *basic* keymap.  
+
+**Features**
+
+* Qwerty and Colemak Mod-DH support
+* autoshifting
+* double tap LSHIFT and ENTER for quick access to ( and )
+
+## QWERTY (Normal) Layer
+```
+,-----------------------------------------------------------------------------------.
+| `    |   Q  |   W  |   E  |   R  |   T  |   Y  |   U  |   I  |   O  |   P  | Bksp |
+|------+------+------+------+------+-------------+------+------+------+------+------|
+| Esc  |   A  |   S  |   D  |   F  |   G  |   H  |   J  |   K  |   L  |   ;  |  '   |
+|------+------+------+------+------+------|------+------+------+------+------+------|
+| Shift|   Z  |   X  |   C  |   V  |   B  |   N  |   M  |   ,  |   .  |   /  |Enter |
+|------+------+------+------+------+------+------+------+------+------+------+------|
+| Ctrl | GUI  | Alt  | GUI  |Lower | Tab  |Space |Raise | Left | Down |  Up  |Right |
+`-----------------------------------------------------------------------------------'
+```
+
+## Colemak Layer
+Switch from `Adjust` layer.
+```
+,-----------------------------------------------------------------------------------.
+| `    |   Q  |   W  |   F  |   P  |   B  |   J  |   L  |   U  |   Y  |   ;  | Bksp |
+|------+------+------+------+------+-------------+------+------+------+------+------|
+| Ctrl |   A  |   R  |   S  |   T  |   G  |   M  |   N  |   E  |   I  |   O  |  '   |
+|------+------+------+------+------+------|------+------+------+------+------+------|
+| Shift|   Z  |   X  |   C  |   D  |   V  |   K  |   H  |   ,  |   .  |   /  |Enter |
+|------+------+------+------+------+------+------+------+------+------+------+------|
+| Ctrl | GUI  | Alt  | GUI  |Lower | Tab  |Space |Raise | Left | Down |  Up  |Right |
+`-----------------------------------------------------------------------------------'
+```
+
+## Lower
+```
+,-----------------------------------------------------------------------------------.
+|   ~  |   !  |   @  |   #  |   $  |   %  |   ^  |   &  |   *  |   (  |   )  | Bksp |
+|------+------+------+------+------+-------------+------+------+------+------+------|
+| Del  |  F1  |  F2  |  F3  |  F4  |  F5  |  F6  |   _  |   +  |   {  |   }  |  |   |
+|------+------+------+------+------+------|------+------+------+------+------+------|
+|      |  F7  |  F8  |  F9  |  F10 |  F11 |  F12 |ISO ~ |ISO | | Home | End  |      |
+|------+------+------+------+------+------+------+------+------+------+------+------|
+|      |      |      |      |      |             |      | Next | Vol- | Vol+ | Play |
+`-----------------------------------------------------------------------------------'
+```
+
+## Raise
+```
+,-----------------------------------------------------------------------------------.
+|   `  |   1  |   2  |   3  |   4  |   5  |   6  |   7  |   8  |   9  |   0  | Bksp |
+|------+------+------+------+------+-------------+------+------+------+------+------|
+| Del  |  F1  |  F2  |  F3  |  F4  |  F5  |  F6  |   -  |   =  |   [  |   ]  |  \   |
+|------+------+------+------+------+------|------+------+------+------+------+------|
+|      |  F7  |  F8  |  F9  |  F10 |  F11 |  F12 |ISO # |ISO / |Pg Up |Pg Dn |      |
+|------+------+------+------+------+------+------+------+------+------+------+------|
+|      |      |      |      |      |             |      | Prev | Vol- | Mute | Stop |
+`-----------------------------------------------------------------------------------'
+```
+
+## Adjust
+`AuSh` toggles autoshifting.
+```
+,-----------------------------------------------------------------------------------.
+|      |      |      |      |      |      |      |      |      |      |      |      |
+|------+------+------+------+------+-------------+------+------+------+------+------|
+|      |      |      |      |      |      |      |Qwerty|Colemk|      |      |      |
+|------+------+------+------+------+------|------+------+------+------+------+------|
+|      |      |      |      |      |      |      |      |      |      |      |      |
+|------+------+------+------+------+------+------+------+------+------+------+------|
+|      |      |      |      |      |             |      |      |      |      | AuSh |
+`-----------------------------------------------------------------------------------'
+```
diff --git a/keyboards/contra/keymaps/erovia/rules.mk b/keyboards/contra/keymaps/erovia/rules.mk
new file mode 100755
index 0000000000..97999d9cb0
--- /dev/null
+++ b/keyboards/contra/keymaps/erovia/rules.mk
@@ -0,0 +1,2 @@
+AUTO_SHIFT_ENABLE = yes
+TAP_DANCE_ENABLE = yes