gBoards Common (#8921)

Co-Authored-By: Drashna Jaelre <drashna@live.com>

keyboards/gboards/engine/engine.h

@@ -0,0 +1,104 @@
+/* 	2019, g Heavy Industries
+        Blessed mother of Christ, please keep this readable
+        and protect us from segfaults. For thine is the clock,
+        the slave and the master. Until we return from main.
+
+        Amen.
+
+        This is a stripped down version of the Georgi engine meant for use with
+        . As such serial-Steno features are disabled, chords are 16bits and
+        crap is removed where possible
+*/
+
+#include QMK_KEYBOARD_H
+#pragma once
+#include "keymap.h"
+#include <string.h>
+#include <stdint.h>
+#include <stdio.h>
+#include "config_engine.h"
+#include <avr/pgmspace.h>
+#include "wait.h"
+
+// Maximum values for combos
+#define COMBO_END 0x00
+
+// In memory chord datatypes
+enum specialActions {
+    SPEC_STICKY,
+    SPEC_REPEAT,
+    SPEC_CLICK,
+    SPEC_SWITCH,
+};
+struct funcEntry {
+    C_SIZE chord;
+    void (*act)(void);
+} funcEntry_t;
+struct stringEntry {
+    C_SIZE chord;
+    PGM_P  str;
+} stringEntry_t;
+struct comboEntry {
+    C_SIZE chord;
+    PGM_P  keys;
+} comboEntry_t;
+struct keyEntry {
+    C_SIZE  chord;
+    uint8_t key;
+} keyEntry_t;
+struct specialEntry {
+    C_SIZE              chord;
+    enum specialActions action;
+    uint16_t            arg;
+} specialEntry_t;
+
+// Chord Temps
+extern C_SIZE cChord;
+extern C_SIZE test;
+
+// Function defs
+void    processKeysUp(void);
+void    processChord(void);
+C_SIZE  processQwerty(bool lookup);
+C_SIZE  processFakeSteno(bool lookup);
+void    saveState(C_SIZE cChord);
+void    restoreState(void);
+uint8_t bitpop_v(C_SIZE val);
+
+// Macros for use in keymap.c
+void   SEND(uint8_t kc);
+void   REPEAT(void);
+void   SET_STICKY(C_SIZE);
+void   SWITCH_LAYER(int);
+void   CLICK_MOUSE(uint8_t);
+C_SIZE process_engine_post(C_SIZE cur_chord, uint16_t keycode, keyrecord_t *record);
+C_SIZE process_chord_getnext(C_SIZE cur_chord);
+
+// Keymap helpers
+// New Approach, multiple structures
+#define P_KEYMAP(chord, keycode) {chord, keycode},
+
+#define K_KEYMAP(chord, name, ...) {chord, (PGM_P)&name},
+#define K_ACTION(chord, name, ...) const uint8_t name[] PROGMEM = __VA_ARGS__;
+
+#define S_KEYMAP(chord, name, string) {chord, (PGM_P)&name},
+#define S_ACTION(chord, name, string) const char name[] PROGMEM = string;
+
+#define X_KEYMAP(chord, name, func) {chord, name},
+#define X_ACTION(chord, name, func) \
+    void name(void) { func }
+
+#define Z_KEYMAP(chord, act, arg) {chord, act, arg},
+
+#define TEST_COLLISION(chord, ...) \
+    case chord:                    \
+        break;
+#define BLANK(...)
+
+// Shift to internal representation
+// i.e) S(teno)R(ight)F
+#define STN(n) ((C_SIZE)1 << n)
+#define ENGINE_HOOK(keycode, chord)                        \
+    case keycode:                                          \
+        pr ? (pressed |= (chord)) : (pressed &= ~(chord)); \
+        break;