Add ctrl-u to clear query

selecta

@@ -23,6 +23,7 @@ require "io/console"
 KEY_CTRL_C = ?\C-c
 KEY_CTRL_N = ?\C-n
 KEY_CTRL_P = ?\C-p
+KEY_CTRL_U = ?\C-u
 KEY_CTRL_W = ?\C-w
 KEY_DELETE = 127.chr # Equivalent to ?\C-?
 
@@ -73,6 +74,7 @@ class Selecta
     when KEY_CTRL_N then search.down
     when KEY_CTRL_P then search.up
 
+    when KEY_CTRL_U then search.clear_query
     when KEY_CTRL_W then search.delete_word
     when KEY_DELETE then search.backspace
 
@@ -202,6 +204,11 @@ class Search
           :query => @query[0...-1])
   end
 
+  def clear_query
+    merge(:index => 0,
+          :query => "")
+  end
+
   def delete_word
     merge(:index => 0,
           :query => @query.sub(/[^ ]* *$/, ""))

spec/search_spec.rb

@@ -55,6 +55,15 @@
     search.append_search_string(" a b").delete_word.query.should == " a "
   end
 
+  it "clears query" do
+    search.append_search_string("").clear_query.query.should == ""
+    search.append_search_string("a").clear_query.query.should == ""
+    search.append_search_string("a ").clear_query.query.should == ""
+    search.append_search_string("a b").clear_query.query.should == ""
+    search.append_search_string("a b ").clear_query.query.should == ""
+    search.append_search_string(" a b").clear_query.query.should == ""
+  end
+
   describe "matching" do
     it "only returns matching choices" do
       config = Configuration.from_inputs(["a", "b"],