Add a way to override the HID short name

With this change, each device can specify a short name in their device
properties, which will be used to override the HID shortname. Due to link order,
we need to do the override in the user sketch, so we hook into the `KEYMAPS`
macro, to call `_INIT_HID_GETSHORTNAME`, which will set the override up for us.

The short name defaults to "kaleidoscope".

Together with keyboardio/KeyboardioHID#61, fixes keyboardio/KeyboardioHID#54.

Signed-off-by: Gergely Nagy <algernon@keyboard.io>

src/kaleidoscope/device/Base.h

@@ -60,6 +60,7 @@ struct BaseProps {
   typedef kaleidoscope::driver::bootloader::None Bootloader;
   typedef kaleidoscope::driver::storage::BaseProps StorageProps;
   typedef kaleidoscope::driver::storage::None Storage;
+  static constexpr const char *short_name = USB_PRODUCT;
 };
 
 template<typename _DeviceProps>
@@ -116,8 +117,8 @@ class Base {
   }
 
   /**
-     * Returns the key scanner used by the keyboard.
-     */
+   * Returns the key scanner used by the keyboard.
+   */
   KeyScanner &keyScanner() {
     return key_scanner_;
   }
@@ -129,6 +130,14 @@ class Base {
     return led_driver_;
   }
 
+  /**
+   * Returns the short name of the device.
+   */
+  static const uint8_t getShortName(char *name) {
+    memcpy(name, _DeviceProps::short_name, strlen(_DeviceProps::short_name));
+    return strlen(_DeviceProps::short_name);
+  }
+
   /**
    * @defgroup kaleidoscope_hardware_leds Kaleidoscope::Hardware/LEDs
    * @{
@@ -534,4 +543,3 @@ class Base {
 #define EXPORT_DEVICE(DEVICE)                                                  \
   typedef DEVICE##Props DeviceProps;
 #endif // ifndef KALEIDOSCOPE_VIRTUAL_BUILD
-

src/kaleidoscope/layers.h

@@ -22,6 +22,7 @@
 #include "kaleidoscope/device/device.h"
 #include "kaleidoscope_internal/device.h"
 #include "kaleidoscope_internal/sketch_exploration/sketch_exploration.h"
+#include "kaleidoscope_internal/shortname.h"
 
 // Macro for defining the keymap. This should be used in the sketch
 // file (*.ino) to define the keymap[] array that holds the user's
@@ -36,7 +37,8 @@
   */                                                                    __NL__ \
   kaleidoscope::internal::Keymaps2DInterface keymaps;                   __NL__ \
                                                                         __NL__ \
-  _INIT_SKETCH_EXPLORATION
+  _INIT_SKETCH_EXPLORATION                                              __NL__ \
+  _INIT_HID_GETSHORTNAME
 
 extern uint8_t layer_count;
 

src/kaleidoscope_internal/shortname.h

@@ -0,0 +1,32 @@
+/* kaleidoscope_internal::shortname -- HID short name override helper
+ * Copyright (C) 2019  Keyboard.io, Inc.
+ *
+ * This program is free software: you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License as published by the Free Software
+ * Foundation, version 3.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+/*
+ * We want to be able to override the short name of the device. For that, we
+ * currently need to override `HID_::getShortName`, but due to link ordering, we
+ * need to do that in the user sketch. For this reason, `_INIT_HID_GETSHORTNAME`
+ * gets called from the `KEYMAPS` macro.
+ *
+ * TODO(anyone): Once we have a better way to override the short name, remove
+ * this workaround.
+ */
+
+#define _INIT_HID_GETSHORTNAME                        __NL__ \
+  uint8_t HID_::getShortName(char *name) {            __NL__ \
+    return Kaleidoscope.device().getShortName(name);  __NL__ \
+  }