Add MouseKeysConfig plugin

This new plugin will allow MouseKeys to be configured via Focus, and store and
retrieve its config parameters from EEPROM, enabling Chrysalis to control it.

Signed-off-by: Michael Richters <gedankenexperimenter@gmail.com>

plugins/Kaleidoscope-MouseKeys/src/kaleidoscope/plugin/MouseKeys.h

@@ -148,6 +148,11 @@ class MouseKeys : public kaleidoscope::Plugin {
     uint16_t cursor_accel_duration = 1000;
   };
 
+  // ---------------------------------------------------------------------------
+  // This lets the MouseKeysConfig plugin access the internal config variables
+  // directly. Mainly useful for calls to `Runtime.storage.get()`/`.put()`.
+  friend class MouseKeysConfig;
+
  private:
   static constexpr uint8_t cursor_update_interval_ = 4;
 
@@ -183,7 +188,21 @@ class MouseKeys : public kaleidoscope::Plugin {
   uint8_t cursorDelta() const;
 };
 
+// =============================================================================
+// Plugin for configuration of MouseKeys via Focus and persistent storage of
+// settins in EEPROM (i.e. Chrysalis).
+class MouseKeysConfig : public Plugin {
+ public:
+  EventHandlerResult onSetup();
+  EventHandlerResult onFocusEvent(const char *command);
+
+ private:
+  // The base address in persistent storage for configuration data:
+  uint16_t settings_addr_;
+};
+
 } // namespace plugin
 } // namespace kaleidoscope
 
 extern kaleidoscope::plugin::MouseKeys MouseKeys;
+extern kaleidoscope::plugin::MouseKeysConfig MouseKeysConfig;

plugins/Kaleidoscope-MouseKeys/src/kaleidoscope/plugin/MouseKeysConfig.cpp

@@ -0,0 +1,144 @@
+/* -*- mode: c++ -*-
+ * Kaleidoscope-MouseKeys -- Mouse keys for Kaleidoscope.
+ * Copyright (C) 2022  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/>.
+ */
+
+#include "kaleidoscope/plugin/MouseKeys.h"  // IWYU pragma: associated
+
+#include <Arduino.h>                       // for PSTR, strcmp_P, strncmp_P
+#include <Kaleidoscope-EEPROM-Settings.h>  // for EEPROMSettings
+#include <Kaleidoscope-FocusSerial.h>      // for Focus, FocusSerial
+#include <stdint.h>                        // for uint16_t, uint32_t, uint8_t
+
+#include "kaleidoscope/Runtime.h"               // for Runtime, Runtime_
+#include "kaleidoscope/device/device.h"         // for VirtualProps::Storage, Base<>::Storage
+#include "kaleidoscope/event_handler_result.h"  // for EventHandlerResult, EventHandlerResult::OK
+
+namespace kaleidoscope {
+namespace plugin {
+
+// =============================================================================
+// MouseKeys configurator
+
+EventHandlerResult MouseKeysConfig::onSetup() {
+  settings_addr_ = ::EEPROMSettings.requestSlice(sizeof(MouseKeys::Settings));
+  uint32_t checker;
+
+  Runtime.storage().get(settings_addr_, checker);
+
+  // If the EEPROM is empty, storre the default settings.
+  if (checker == 0xffffffff) {
+    Runtime.storage().put(settings_addr_, ::MouseKeys.settings_);
+    Runtime.storage().commit();
+  }
+
+  Runtime.storage().get(settings_addr_, ::MouseKeys.settings_);
+  return EventHandlerResult::OK;
+}
+
+// -----------------------------------------------------------------------------
+EventHandlerResult MouseKeysConfig::onFocusEvent(const char *command) {
+  // If the focus command is a request for help, provide the list of valid
+  // commands.
+  if (::Focus.handleHelp(command, PSTR("mousekeys.scroll_interval\n"
+                                       "mousekeys.init_speed\n"
+                                       "mousekeys.base_speed\n"
+                                       "mousekeys.accel_duration")))
+    return EventHandlerResult::OK;
+
+  // The length of the string `mousekeys.`:
+  constexpr uint8_t base_cmd_len = 10;
+
+  // If this is not a MouseKeys command, do nothing.
+  if (strncmp_P(command, PSTR("mousekeys."), base_cmd_len) != 0)
+    return EventHandlerResult::OK;
+  // Otherwise, advance the pointer to the subcommand.
+  command += base_cmd_len;
+
+  enum Command : uint8_t {
+    SCROLL_INTERVAL,
+    INIT_SPEED,
+    BASE_SPEED,
+    ACCEL_DURATION,
+  };
+  Command cmd;
+
+  // Parse the (sub)command.  If it's not a valid command, abort.
+  if (strcmp_P(command, PSTR("scroll_interval")) == 0)
+    cmd = Command::SCROLL_INTERVAL;
+  else if (strcmp_P(command, PSTR("init_speed")) == 0)
+    cmd = Command::INIT_SPEED;
+  else if (strcmp_P(command, PSTR("base_speed")) == 0)
+    cmd = Command::BASE_SPEED;
+  else if (strcmp_P(command, PSTR("accel_duration")) == 0)
+    cmd = Command::ACCEL_DURATION;
+  else
+    return EventHandlerResult::ABORT;
+
+  if (::Focus.isEOL()) {
+    // If there is no argument given, we send back the current value of the
+    // setting that was requested.
+    uint16_t val;
+    switch (cmd) {
+    case Command::SCROLL_INTERVAL:
+      val = ::MouseKeys.getScrollInterval();
+      break;
+    case Command::INIT_SPEED:
+      val = ::MouseKeys.getCursorInitSpeed();
+      break;
+    case Command::BASE_SPEED:
+      val = ::MouseKeys.getCursorBaseSpeed();
+      break;
+    case Command::ACCEL_DURATION:
+      val = ::MouseKeys.getCursorAccelDuration();
+      break;
+    default:
+      return EventHandlerResult::ABORT;
+    }
+    ::Focus.send(val);
+    return EventHandlerResult::EVENT_CONSUMED;
+  } else {
+    // If there is an argument, we read it, then pass it to the corresponding
+    // setter method of MouseKeys.
+    uint16_t arg;
+    ::Focus.read(arg);
+
+    switch (cmd) {
+    case Command::SCROLL_INTERVAL:
+      ::MouseKeys.setScrollInterval(arg);
+      break;
+    case Command::INIT_SPEED:
+      ::MouseKeys.setCursorInitSpeed(arg);
+      break;
+    case Command::BASE_SPEED:
+      ::MouseKeys.setCursorBaseSpeed(arg);
+      break;
+    case Command::ACCEL_DURATION:
+      ::MouseKeys.setCursorAccelDuration(arg);
+      break;
+    }
+  }
+
+  // Update settings stored in EEPROM, and indicate that this Focus event has
+  // been handled successfully.
+  Runtime.storage().put(settings_addr_, ::MouseKeys.settings_);
+  Runtime.storage().commit();
+  return EventHandlerResult::EVENT_CONSUMED;
+}
+
+}  // namespace plugin
+}  // namespace kaleidoscope
+
+kaleidoscope::plugin::MouseKeysConfig MouseKeysConfig;