Ensure colons do not break titles

When titles have colons in them, it breaks the liquid template.
This encapsulates the titles in string literals if the user
wants a title with a colon in it.

Closes #38

Author: djds23

lib/jekyll-compose/file_info.rb

@@ -13,8 +13,18 @@ def content
     <<-CONTENT.gsub /^\s+/, ''
       ---
       layout: #{params.layout}
-      title: #{params.title}
+      title: #{yaml_clean_title}
       ---
     CONTENT
   end
+
+  private
+
+  def yaml_clean_title
+    if params.title.include? ':'
+      '"' + params.title + '"'
+    else
+      params.title
+    end
+  end
 end

spec/file_info_spec.rb

@@ -0,0 +1,46 @@
+RSpec.describe(Jekyll::Compose::FileInfo) do
+  describe '#content' do
+    context 'with a title of only words' do
+      let(:expected_result) {<<-CONTENT.gsub(/^\s+/, '')
+          ---
+          layout: post
+          title: A test arg parser
+          ---
+        CONTENT
+      }
+
+      let(:parsed_args) { Jekyll::Compose::ArgParser.new(
+          ['A test arg parser'],
+          {}
+        )
+      }
+
+      it 'does not wrap the title in quotes' do
+        file_info = described_class.new parsed_args
+        expect(file_info.content).to eq(expected_result)
+      end
+    end
+
+    context 'with a title that includes a colon' do
+      let(:expected_result) {<<-CONTENT.gsub(/^\s+/, '')
+          ---
+          layout: post
+          title: "A test: arg parser"
+          ---
+        CONTENT
+      }
+
+      let(:parsed_args) { Jekyll::Compose::ArgParser.new(
+          ['A test: arg parser'],
+          {}
+        )
+      }
+
+      it 'does wrap the title in quotes' do
+        file_info = described_class.new parsed_args
+        expect(file_info.content).to eq(expected_result)
+      end
+    end
+  end
+end
+