EEPROM-Settings: Implement an `eeprom.erase` command (#1137)

The `eeprom.erase` command makes it easier to erase the whole of EEPROM, and in
addition, it will reboot the keyboard so that the changes are picked up by every
single plugin.

Fixes #1134.

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

plugins/Kaleidoscope-EEPROM-Settings/README.md

@@ -172,6 +172,11 @@ following commands:
 
 > Returns the amount of free bytes in `EEPROM`.
 
+### `eeprom.erase`
+
+> Erases the entire `EEPROM`, and reboots the keyboard to make sure the erase is
+> picked up by every single plugin.
+
 ## Dependencies
 
 * (Kaleidoscope-FocusSerial)[Kaleidoscope-FocusSerial.md]

plugins/Kaleidoscope-EEPROM-Settings/src/kaleidoscope/plugin/EEPROM-Settings.cpp

@@ -208,15 +208,18 @@ EventHandlerResult FocusEEPROMCommand::onFocusEvent(const char *command) {
   enum {
     CONTENTS,
     FREE,
+    ERASE,
   } sub_command;
 
-  if (::Focus.handleHelp(command, PSTR("eeprom.contents\neeprom.free")))
+  if (::Focus.handleHelp(command, PSTR("eeprom.contents\neeprom.free\neeprom.erase")))
     return EventHandlerResult::OK;
 
   if (strcmp_P(command, PSTR("eeprom.contents")) == 0)
     sub_command = CONTENTS;
   else if (strcmp_P(command, PSTR("eeprom.free")) == 0)
     sub_command = FREE;
+  else if (strcmp_P(command, PSTR("eeprom.erase")) == 0)
+    sub_command = ERASE;
   else
     return EventHandlerResult::OK;
 
@@ -241,8 +244,15 @@ EventHandlerResult FocusEEPROMCommand::onFocusEvent(const char *command) {
   case FREE:
     ::Focus.send(Runtime.storage().length() - ::EEPROMSettings.used());
     break;
+  case ERASE: {
+    for (uint16_t i = 0; i < Runtime.storage().length(); i++) {
+      Runtime.storage().update(i, 255);
+    }
+    Runtime.storage().commit();
+    Runtime.device().rebootBootloader();
+    break;
+  }
   }
-
   return EventHandlerResult::EVENT_CONSUMED;
 }