Made C-u remove only the beginning of the line by default, as it does…

… in Readline

lib/coolline/coolline.rb

@@ -34,7 +34,7 @@ class Coolline
      Handler.new(?\C-a, &:beginning_of_line),
      Handler.new(?\C-e, &:end_of_line),
      Handler.new(?\C-k, &:kill_line),
-     Handler.new(?\C-u, &:clear_line),
+     Handler.new(?\C-u, &:kill_beginning_of_line),
      Handler.new(?\C-f, &:forward_char),
      Handler.new(?\C-b, &:backward_char),
      Handler.new(?\C-d, &:kill_current_char_or_leave),

lib/coolline/editor.rb

@@ -128,6 +128,12 @@ def kill_line
       line[pos..-1] = ""
     end
 
+    # Removes everything up to the current character
+    def kill_beginning_of_line
+      line[0...pos] = ""
+      self.pos = 0
+    end
+
     # Removes all the characters in the line
     def clear_line
       line.clear

test/editor_test.rb

@@ -63,6 +63,13 @@
     asserts(:line).equals ""
   end
 
+  context "after killing the beginning of the line" do
+    hookup { topic.kill_beginning_of_line }
+
+    asserts(:pos).equals 0
+    asserts(:line).equals ""
+  end
+
   context "after transposing words" do
     hookup { topic.transpose_words }
 
@@ -142,6 +149,13 @@
     asserts(:line).equals ""
   end
 
+  context "after killing the beginning of the line" do
+    hookup { topic.kill_beginning_of_line }
+
+    asserts(:pos).equals 0
+    asserts(:line).equals "a lovely dragon"
+  end
+
   context "after transposing words" do
     hookup { topic.transpose_words }
 
@@ -216,6 +230,13 @@
     asserts(:line).equals "foo "
   end
 
+  context "after killing the beginning of the line" do
+    hookup { topic.kill_beginning_of_line }
+
+    asserts(:pos).equals 0
+    asserts(:line).equals " bar"
+  end
+
   context "after transposing words" do
     hookup { topic.transpose_words }
 
@@ -318,6 +339,13 @@
     asserts(:line).equals "foo bar"
   end
 
+  context "after killing the beginning of the line" do
+    hookup { topic.kill_beginning_of_line }
+
+    asserts(:pos).equals 0
+    asserts(:line).equals " baz"
+  end
+
   context "after transposing words" do
     hookup { topic.transpose_words }
 
@@ -425,6 +453,13 @@
     asserts(:line).equals "a lovely dragon"
   end
 
+  context "after killing the beginning of the line" do
+    hookup { topic.kill_beginning_of_line }
+
+    asserts(:pos).equals 0
+    asserts(:line).equals ""
+  end
+
   context "after transposing words" do
     hookup { topic.transpose_words }
 
@@ -537,6 +572,13 @@
     asserts(:line).equals "foo bar "
   end
 
+  context "after killing the beginning of the line" do
+    hookup { topic.kill_beginning_of_line }
+
+    asserts(:pos).equals 0
+    asserts(:line).equals "baz qux"
+  end
+
   context "after transposing words" do
     hookup { topic.transpose_words }
 
@@ -649,6 +691,13 @@
     asserts(:line).equals "foo bar b"
   end
 
+  context "after killing the beginning of the line" do
+    hookup { topic.kill_beginning_of_line }
+
+    asserts(:pos).equals 0
+    asserts(:line).equals "az qux"
+  end
+
   context "after transposing words" do
     hookup { topic.transpose_words }