device.rb in fusuma-plugin-sendkey-0.13.0

- old
+ new

@@ -1,23 +1,54 @@
 # frozen_string_literal: true
 
+require "revdev"
+require "set"
+
 module Fusuma
   module Plugin
     module Sendkey
       # handle Evdev device
       class Device
         def initialize(path:)
           @evdev = Revdev::EventDevice.new(path)
+          @capabilities = Set.new
         end
 
+        attr_reader :capabilities
+
         def path
           raise "Device path is not found" if @evdev.nil?
 
           @path ||= @evdev.file.path
         end
 
         def write_event(event)
           @evdev.write_input_event(event)
+        end
+
+        def reload_capability
+          @capabilities.clear
+
+          buf = fetch_capabilities
+          buf.unpack("C*").each_with_index do |byte, i|
+            8.times do |bit| # 0..7
+              if byte[bit] != 0
+                @capabilities << (i * 8 + bit)
+              end
+            end
+          end
+          @capabilities
+        end
+
+        private
+
+        EVIOCGBIT = 2153792801
+
+        def fetch_capabilities
+          file = File.open(path, "r")
+          buf = +"" # unfreeze string
+          file.ioctl(EVIOCGBIT, buf)
+          buf
         end
       end
     end
   end
 end