Define keymap layers with CREATE_KEYMAP macro

This macro allows the definition of the LayerCount variable and the
keymaps[] array together. It shouldn't break old sketches, but this is
probably not all that's necessary; LayerCount still doesn't get
initialized outside the macro.

examples/AppSwitcher/AppSwitcher.ino

@@ -24,7 +24,7 @@
 #include "Macros.h"
 
 /* *INDENT-OFF* */
-const Key keymaps[][ROWS][COLS] PROGMEM = {
+CREATE_KEYMAP(
   [0] = KEYMAP_STACKED
   (
    Key_NoKey,    Key_1, Key_2, Key_3, Key_4, Key_5, Key_NoKey,
@@ -43,7 +43,7 @@ const Key keymaps[][ROWS][COLS] PROGMEM = {
    Key_RightShift, Key_RightAlt, Key_Spacebar, Key_RightControl,
    M(M_APPCANCEL)
    ),
-};
+	      )
 /* *INDENT-ON* */
 
 
@@ -66,6 +66,3 @@ void setup() {
 void loop() {
   Kaleidoscope.loop();
 }
-
-// This line should always be at the end of the sketch file
-#include <sketch-trailer.h>

examples/Kaleidoscope/Kaleidoscope.ino

@@ -57,14 +57,13 @@
                                               Key_KeymapNext_Momentary,         Key_KeymapNext_Momentary \
 )
 
-const Key keymaps[][ROWS][COLS] PROGMEM = {
+CREATE_KEYMAP(
   QWERTY,
   GENERIC_FN2,
   NUMPAD
+)
 
 
-};
-
 static kaleidoscope::LEDSolidColor solidRed(60, 0, 0);
 static kaleidoscope::LEDSolidColor solidOrange(60, 20, 0);
 static kaleidoscope::LEDSolidColor solidYellow(40, 35, 0);
@@ -104,6 +103,3 @@ void setup() {
 void loop() {
   Kaleidoscope.loop();
 }
-
-// This line should always be at the end of the sketch file
-#include <sketch-trailer.h>

src/layers.cpp

@@ -125,8 +125,8 @@ void Layer_::move(uint8_t layer) {
 }
 
 void Layer_::on(uint8_t layer) {
+  // If we're trying to turn on a layer that doesn't exist; abort
   if (layer >= LayerCount) {
-    // Trying to turn on a layer that doesn't exist; abort
     return;
   }
 

src/layers.h

@@ -4,9 +4,14 @@
 #include "key_defs.h"
 #include KALEIDOSCOPE_HARDWARE_H
 
+#define CREATE_KEYMAP(layers...)				\
+  const Key keymaps[][ROWS][COLS] PROGMEM = { layers };		\
+  const uint8_t LayerCount = sizeof(keymaps) / sizeof(*keymaps);
+
 // The total number of defined layers in the firmware sketch keymaps[] array
 extern const uint8_t LayerCount;
 
+
 class Layer_ {
  public:
   Layer_(void);

src/sketch-trailer.h

@@ -1,6 +0,0 @@
-#pragma once
-
-// Calculate the number of layers defined in the "keymaps[]"
-// array. This needs to be included in the sketch after "keymaps" is
-// defined
-const uint8_t LayerCount PROGMEM = sizeof(keymaps) / sizeof(*keymaps);