new liquid filter: default

lib/locomotive/liquid/filters/misc.rb

@@ -33,6 +33,10 @@ module Locomotive
           input.last
         end
 
+        def default(input, value)
+          input.blank? ? value : input
+        end
+
       end
 
       ::Liquid::Template.register_filter(Misc)

spec/lib/locomotive/liquid/filters/misc_spec.rb

@@ -4,7 +4,7 @@ describe Locomotive::Liquid::Filters::Misc do
 
   include Locomotive::Liquid::Filters::Misc
 
-  it 'should underscore an input' do
+  it 'underscores an input' do
     underscore('foo').should == 'foo'
     underscore('home page').should == 'home_page'
     underscore('My foo Bar').should == 'my_foo_bar'
@@ -12,19 +12,19 @@ describe Locomotive::Liquid::Filters::Misc do
     underscore('foo/bar/index').should == 'foo_bar_index'
   end
 
-  it 'should dasherize an input' do
+  it 'dasherizes an input' do
     dasherize('foo').should == 'foo'
     dasherize('foo_bar').should == 'foo-bar'
     dasherize('foo/bar').should == 'foo-bar'
     dasherize('foo/bar/index').should == 'foo-bar-index'
   end
 
-  it 'should concat strings' do
+  it 'concats strings' do
     concat('foo', 'bar').should == 'foobar'
     concat('hello', 'foo', 'bar').should == 'hellofoobar'
   end
 
-  it 'should return the input string every n occurences' do
+  it 'returns the input string every n occurences' do
     modulo('foo', 0, 3).should == ''
     modulo('foo', 1, 3).should == ''
     modulo('foo', 2, 3).should == 'foo'
@@ -33,4 +33,10 @@ describe Locomotive::Liquid::Filters::Misc do
     modulo('foo', 5, 3).should == 'foo'
   end
 
+  it 'returns default values if the input is empty' do
+    default('foo', 42).should == 'foo'
+    default('', 42).should == 42
+    default(nil, 42).should == 42
+  end
+
 end