plugin/EscapeOneShot: Add an optional Config plugin

The new plugin - EscapeOneShotConfig - allows one to configure the main
EscapeOneShot plugin via Focus. To make this functionality optional, it is a
separate plugin, still contained in the same library for ease of us.

Documentation and example updated accordingly.

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

examples/Keystrokes/Escape-OneShot/Escape-OneShot.ino

@@ -1,6 +1,6 @@
 /* -*- mode: c++ -*-
  * Kaleidoscope-Escape-OneShot -- Turn ESC into a key that cancels OneShots, if active.
- * Copyright (C) 2016, 2017, 2018  Keyboard.io, Inc
+ * Copyright (C) 2016-2021  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
@@ -16,8 +16,10 @@
  */
 
 #include <Kaleidoscope.h>
+#include <Kaleidoscope-EEPROM-Settings.h>
 #include <Kaleidoscope-OneShot.h>
 #include <Kaleidoscope-Escape-OneShot.h>
+#include <Kaleidoscope-FocusSerial.h>
 
 // *INDENT-OFF*
 KEYMAPS(
@@ -61,8 +63,11 @@ KEYMAPS(
 )
 // *INDENT-ON*
 
-KALEIDOSCOPE_INIT_PLUGINS(OneShot,
-                          EscapeOneShot);
+KALEIDOSCOPE_INIT_PLUGINS(EEPROMSettings,
+                          Focus,
+                          OneShot,
+                          EscapeOneShot,
+                          EscapeOneShotConfig);
 
 void setup() {
   Kaleidoscope.setup();

plugins/Kaleidoscope-Escape-OneShot/README.md

@@ -23,12 +23,35 @@ void setup () {
 }
 ```
 
+If one wishes to configure the plugin at run-time via [Focus][plugin:focus], the
+optional `EscapeOneShotConfig` plugin must also be enabled:
+
+ [plugin:focus]: Kaleidoscope-FocusSerial.md
+
+```c++
+#include <Kaleidoscope.h>
+#include <Kaleidoscope-EEPROM-Settings.h>
+#include <Kaleidoscope-FocusSerial.h>
+#include <Kaleidoscope-OneShot.h>
+#include <Kaleidoscope-Escape-OneShot.h>
+
+KALEIDOSCOPE_INIT_PLUGINS(EEPROMSettings,
+                          Focus,
+                          OneShot,
+                          EscapeOneShot,
+                          EscapeOneShotConfig);
+
+void setup () {
+  Kaleidoscope.setup ();
+}
+```
+
 The plugin only makes sense when using one-shot keys.
 
 ## Plugin methods
 
-The plugin provides the `EscapeOneShot` object, which has one public
-configuration method:
+The plugin provides the `EscapeOneShot` object, which has the following public
+configuration methods:
 
 ### `.setCancelKey(key)`
 
@@ -39,10 +62,45 @@ configuration method:
 > modifiers), there is the special `OneShotCancelKey`, which will not
 > have any side effects.
 
+### `.getCancelKey(key)`
+
+> Returns the `Key` value that will trigger deactivation of one-shot (including
+> sticky) keys.
+
+### `.enable()`, `.disable()`, `.toggle()`, and `.isEnabled()`
+
+> Enables, disables, toggles, and returns the enabled state of the plugin,
+> respectively.
+>
+> By default, the plugin starts enabled.
+
+## Focus commands
+
+The plugin provides two Focus commands: `escape_oneshot.enabled`, and
+`escape_oneshot.cancel_key`.
+
+### `escape_oneshot.enabled [0|1]`
+
+> Without arguments, returns whether the plugin is enabled or not.
+>
+> With an argument, enables or disables it.
+
+### `escape_oneshot.cancel_key [keycode]`
+
+> Without an argument, returns the raw 16-bit keycode of the cancel key set.
+>
+> With an argument - a raw 16-bit keycode -, sets the cancel key to the one
+> corresponding to the given code.
+
 ## Dependencies
 
 * [Kaleidoscope-OneShot](Kaleidoscope-OneShot.md)
 
+### Optional dependencies
+
+* [Kaleidoscope-EEPROM-Settings](Kaleidoscope-EEPROM-Settings.md)
+* [Kaleidoscope-FocusSerial](Kaleidoscope-FocusSerial.md)
+
 ## Further reading
 
 Starting from the [example][plugin:example] is the recommended way of getting

plugins/Kaleidoscope-Escape-OneShot/src/kaleidoscope/plugin/Escape-OneShot-Config.cpp

@@ -0,0 +1,107 @@
+/* -*- mode: c++ -*-
+ * Kaleidoscope-Escape-OneShot -- Turn ESC into a key that cancels OneShots, if active.
+ * Copyright (C) 2016-2021  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/Escape-OneShot.h"
+
+#include <Kaleidoscope-EEPROM-Settings.h>
+#include <Kaleidoscope-FocusSerial.h>
+
+#include "kaleidoscope/Runtime.h"
+
+namespace kaleidoscope {
+namespace plugin {
+
+uint16_t EscapeOneShotConfig::settings_base_;
+
+EventHandlerResult EscapeOneShotConfig::onSetup() {
+  settings_base_ = ::EEPROMSettings.requestSlice(sizeof(EscapeOneShot::settings_));
+  struct {
+    uint8_t b;
+    uint16_t w;
+  } checker;
+
+  Runtime.storage().get(settings_base_, checker);
+
+  // Check if we have an empty eeprom...
+  if (checker.b == 0xff && checker.w == 0xffff) {
+    // ...if the eeprom was empty, store the default settings.
+    Runtime.storage().put(settings_base_, EscapeOneShot::settings_);
+    Runtime.storage().commit();
+  }
+
+  Runtime.storage().get(settings_base_, EscapeOneShot::settings_);
+  return EventHandlerResult::OK;
+}
+
+EventHandlerResult EscapeOneShotConfig::onNameQuery() {
+  return ::Focus.sendName(F("EscapeOneShot"));
+}
+
+EventHandlerResult EscapeOneShotConfig::onFocusEvent(const char *command) {
+  enum {
+    ENABLED,
+    CANCEL_KEY
+  } subCommand;
+
+  if (::Focus.handleHelp(command, PSTR("escape_oneshot.enabled\n"
+                                       "escape_oneshot.cancel_key")))
+    return EventHandlerResult::OK;
+
+  if (strncmp_P(command, PSTR("escape_oneshot."), 15) != 0)
+    return EventHandlerResult::OK;
+  if (strcmp_P(command + 15, PSTR("enabled")) == 0)
+    subCommand = ENABLED;
+  else if (strcmp_P(command + 15, PSTR("cancel_key")) == 0)
+    subCommand = CANCEL_KEY;
+  else
+    return EventHandlerResult::OK;
+
+  switch (subCommand) {
+  case ENABLED:
+    if (::Focus.isEOL()) {
+      ::Focus.send(::EscapeOneShot.isEnabled());
+    } else {
+      uint8_t v;
+      ::Focus.read(v);
+      if (v != 0) {
+        ::EscapeOneShot.enable();
+      } else {
+        ::EscapeOneShot.disable();
+      }
+    }
+    break;
+
+  case CANCEL_KEY:
+    if (::Focus.isEOL()) {
+      ::Focus.send(::EscapeOneShot.getCancelKey());
+    } else {
+      Key k;
+      ::Focus.read(k);
+      ::EscapeOneShot.setCancelKey(k);
+    }
+    break;
+  }
+
+  Runtime.storage().put(settings_base_, EscapeOneShot::settings_);
+  Runtime.storage().commit();
+  return EventHandlerResult::EVENT_CONSUMED;
+}
+
+} // namespace plugin
+} // namespace kaleidoscope
+
+kaleidoscope::plugin::EscapeOneShotConfig EscapeOneShotConfig;

plugins/Kaleidoscope-Escape-OneShot/src/kaleidoscope/plugin/Escape-OneShot.h

@@ -50,6 +50,8 @@ class EscapeOneShot : public kaleidoscope::Plugin {
     return !settings_.disabled;
   }
 
+  friend class EscapeOneShotConfig;
+
  private:
   struct Settings {
     bool disabled;
@@ -57,9 +59,20 @@ class EscapeOneShot : public kaleidoscope::Plugin {
   };
   static Settings settings_;
 };
+
+class EscapeOneShotConfig : public Plugin {
+ public:
+  EventHandlerResult onSetup();
+  EventHandlerResult onFocusEvent(const char *command);
+  EventHandlerResult onNameQuery();
+
+
+ private:
+  static uint16_t settings_base_;
 };
 
 }
 }
 
 extern kaleidoscope::plugin::EscapeOneShot EscapeOneShot;
+extern kaleidoscope::plugin::EscapeOneShotConfig EscapeOneShotConfig;