Add support to textAlign attribute when converting to HTML (#33)

* Add support to textAlign attribute when converting to HTML

lib/tip_tap/html_renderable.rb

@@ -54,7 +54,17 @@ def html_class_name
     end
 
     def to_html
-      content_tag(html_tag, safe_join(content.map(&:to_html)), class: html_class_name)
+      content_tag(html_tag, safe_join(content.map(&:to_html)), html_attributes)
+    end
+
+    def html_attributes
+      {style: inline_styles, class: html_class_name}.reject { |key, value| value.blank? }
+    end
+
+    def inline_styles
+      styles = []
+      styles << "text-align: #{attrs["textAlign"]};" if attrs["textAlign"]
+      styles.join(" ")
     end
   end
 end

spec/tip_tap/nodes/heading_spec.rb

@@ -11,6 +11,16 @@
       expect(html).to be_a(String)
       expect(html).to eq("<h2></h2>")
     end
+
+    context "when the textAlign attribute is present" do
+      it "returns a tag with the specified text alignment style" do
+        node = TipTap::Nodes::Heading.from_json({content: [], attrs: {"textAlign" => "center", :level => 2}})
+        html = node.to_html
+
+        expect(html).to be_a(String)
+        expect(html).to eq('<h2 style="text-align: center;"></h2>')
+      end
+    end
   end
 
   describe "level" do

spec/tip_tap/nodes/paragraph_spec.rb

@@ -11,6 +11,16 @@
       expect(html).to be_a(String)
       expect(html).to eq("<p></p>")
     end
+
+    context "when the textAlign attribute is present" do
+      it "returns a p tag with the specified text alignment style" do
+        node = TipTap::Nodes::Paragraph.from_json({content: [], attrs: {"textAlign" => "center"}})
+        html = node.to_html
+
+        expect(html).to be_a(String)
+        expect(html).to eq('<p style="text-align: center;"></p>')
+      end
+    end
   end
 
   describe "to_h" do