feat(xkeyboard): Add variant support to layout label (#2163)

* Add variant support to xkeyboard layout label

Solves #316

* Run style checks, I guess?

* Add comment

* Return nothing if there is no variant

* Update CHANGELOG

CHANGELOG.md

@@ -33,6 +33,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   ([`#2294`](https://github.com/polybar/polybar/issues/2294))
 - `internal/network`: `speed-unit = B/s` can be used to customize how network
   speeds are displayed.
+- `internal/xkeyboard`: `%variant%` can be used to parse the layout variant
+  ([`#316`](https://github.com/polybar/polybar/issues/316))
 
 ### Changed
 - Slight changes to the value ranges the different ramp levels are responsible

include/x11/extensions/xkb.hpp

@@ -44,7 +44,7 @@ namespace evt {
   using xkb_action_message = xpp::xkb::event::action_message<connection&>;
   using xkb_access_x_notify = xpp::xkb::event::access_x_notify<connection&>;
   using xkb_extension_device_notify = xpp::xkb::event::extension_device_notify<connection&>;
-}
+}  // namespace evt
 
 class keyboard {
  public:
@@ -62,7 +62,9 @@ class keyboard {
   };
 
   explicit keyboard(vector<layout>&& layouts_, map<indicator::type, indicator>&& indicators_, unsigned char group)
-      : layouts(forward<decltype(layouts)>(layouts_)), indicators(forward<decltype(indicators)>(indicators_)), current_group(group) {}
+      : layouts(forward<decltype(layouts)>(layouts_))
+      , indicators(forward<decltype(indicators)>(indicators_))
+      , current_group(group) {}
 
   const indicator& get(const indicator::type& i) const;
   void set(unsigned int state);
@@ -71,6 +73,7 @@ class keyboard {
   unsigned char current() const;
   const string group_name(size_t index = 0) const;
   const string layout_name(size_t index = 0) const;
+  const string variant_name(size_t index = 0) const;
   const string indicator_name(const indicator::type&) const;
   size_t size() const;
 
@@ -90,6 +93,6 @@ namespace xkb_util {
   vector<keyboard::layout> get_layouts(connection& conn, xcb_xkb_device_spec_t device);
   map<keyboard::indicator::type, keyboard::indicator> get_indicators(connection& conn, xcb_xkb_device_spec_t device);
   string parse_layout_symbol(string&& name);
-}
+}  // namespace xkb_util
 
 POLYBAR_NS_END

src/modules/xkeyboard.cpp

@@ -1,12 +1,12 @@
 #include "modules/xkeyboard.hpp"
+
 #include "drawtypes/iconset.hpp"
 #include "drawtypes/label.hpp"
+#include "modules/meta/base.inl"
 #include "utils/factory.hpp"
 #include "x11/atoms.hpp"
 #include "x11/connection.hpp"
 
-#include "modules/meta/base.inl"
-
 POLYBAR_NS
 
 namespace modules {
@@ -25,8 +25,6 @@ namespace modules {
    */
   xkeyboard_module::xkeyboard_module(const bar_settings& bar, string name_)
       : static_module<xkeyboard_module>(bar, move(name_)), m_connection(connection::make()) {
-
-
     // Setup extension
     // clang-format off
     m_connection.xkb().select_events_checked(XCB_XKB_ID_USE_CORE_KBD,
@@ -121,6 +119,7 @@ namespace modules {
     if (m_layout) {
       m_layout->reset_tokens();
       m_layout->replace_token("%name%", m_keyboard->group_name(m_keyboard->current()));
+      m_layout->replace_token("%variant%", m_keyboard->variant_name(m_keyboard->current()));
 
       auto const current_layout = m_keyboard->layout_name(m_keyboard->current());
       auto icon = m_layout_icons->get(current_layout, DEFAULT_LAYOUT_ICON);
@@ -287,6 +286,6 @@ namespace modules {
       update();
     }
   }
-}
+}  // namespace modules
 
 POLYBAR_NS_END

src/x11/extensions/xkb.cpp

@@ -64,6 +64,21 @@ const string keyboard::layout_name(size_t index) const {
   return layouts[index].symbols[index];
 }
 
+/**
+ * Get current variant name
+ * "GROUP (VARIANT)"
+ *         ^^^^^^^
+ */
+const string keyboard::variant_name(size_t index) const {
+  string group_name = this->group_name(index);
+  if (int start = group_name.find('(') + 1) {
+    int num_chars = group_name.find(')') - start;
+    return group_name.substr(start, num_chars);
+  } else {
+    return "";
+  }
+}
+
 /**
  * Get indicator name
  */
@@ -212,6 +227,6 @@ namespace xkb_util {
     }
     return move(name);
   }
-}
+}  // namespace xkb_util
 
 POLYBAR_NS_END