feat: add configurable Space leader bindings

src/ruby_host.rb

@@ -50,6 +50,7 @@ module Vamp
     def initialize
       @plugins = []
       @bindings = []
+      @leader = "space"
     end
 
     def plugin(path)
@@ -59,6 +60,12 @@ module Vamp
       nil
     end
 
+    def leader=(key)
+      key = Vamp.string!(key, "leader key")
+      raise ArgumentError, "leader key must not be empty" if key.empty?
+      @leader = key
+    end
+
     def core
       Core
     end
@@ -89,7 +96,8 @@ module Vamp
     end
 
     def response
-      { "version" => 1, "type" => "config", "plugins" => @plugins, "bindings" => @bindings }
+      { "version" => 1, "type" => "config", "plugins" => @plugins,
+        "bindings" => @bindings, "leader" => @leader }
     end
   end