Add option to suppress array index in output.

lib/ap/awesome_print.rb

@@ -14,6 +14,7 @@ class AwesomePrint
       :multiline => true,
       :plain     => false,
       :indent    => 4,
+      :index     => true,
       :color     => { 
         :array      => :white,
         :bigdecimal => :blue,
@@ -50,7 +51,11 @@ class AwesomePrint
     if @options[:multiline]
       width = (a.size - 1).to_s.size 
       data = a.inject([]) do |arr, item|
-        index = colorize("#{indent}[#{arr.size.to_s.rjust(width)}] ", :array)
+        index = if @options[:index]
+          colorize("#{indent}[#{arr.size.to_s.rjust(width)}] ", :array)
+        else
+          colorize(indent, :array)
+        end
         indented do
           arr << (index << awesome(item))
         end

spec/awesome_print_spec.rb

@@ -30,6 +30,23 @@ describe "AwesomePrint" do
         ]
     ]
 ]
+EOS
+      end
+
+    it "plain multiline without index" do
+      @arr.ai(:plain => true, :index => false).should == <<-EOS.strip
+[
+    1,
+    :two,
+    "three",
+    [
+        nil,
+        [
+            true,
+            false
+        ]
+    ]
+]
 EOS
       end
 
@@ -50,6 +67,23 @@ EOS
 EOS
     end
 
+    it "plain multiline indented without index" do
+      @arr.ai(:plain => true, :indent => 2, :index => false).should == <<-EOS.strip
+[
+  1,
+  :two,
+  "three",
+  [
+    nil,
+    [
+      true,
+      false
+    ]
+  ]
+]
+EOS
+    end
+
     it "plain single line" do
       @arr.ai(:plain => true, :multiline => false).should == '[ 1, :two, "three", [ nil, [ true, false ] ] ]'
     end
@@ -110,6 +144,16 @@ EOS
 EOS
     end
 
+    it "plain multiline without index" do
+      @arr.ai(:plain => true, :index => false).should == <<-EOS.strip
+[
+    1,
+    2,
+    [...]
+]
+EOS
+    end
+
     it "plain single line" do
       @arr.ai(:plain => true, :multiline => false).should == "[ 1, 2, [...] ]"
     end