✨ Add the ability to identify em dashes.

 #10

README.md

@@ -138,6 +138,16 @@ Let's make sure click doesn't look like dick.
 <p>There’s more to love with every <span class="fix-letter-spacing">click</p>.</p>
 ```
 
+### Em dash
+
+Identify em dashes and surround them with a span.
+
+```html
+<p>{{ "Upon discovering the errors—all 124 of them—the publisher immediately recalled the books." | jt_emdash }}</p>
+
+<p>Upon discovering the errors<span class="emdash">&mdash;</span>all 124 of them<span class="emdash">&mdash;</span>the publisher immediately recalled the books.</p>
+```
+
 ## Development
 
 After checking out the repo, run `bin/setup` to install dependencies. Then, run `bin/console` for an interactive prompt that will allow you to experiment.

lib/jekyll/typogrify.rb

@@ -103,6 +103,15 @@ def jt_caps(text)
       return custom_caps(text.to_s)
     end
 
+    # converts a — (em dash) by optional whitespace or a non-breaking space
+    # to the HTML entity and surrounds it in a span with a styled class.
+    #
+    # @param [String] text input text
+    # @return [String] input text with em dashes wrapped
+    def jt_emdash(text)
+      return emdash(text.to_s)
+    end
+
     private
 
     # custom modules to jekyll-typogrify
@@ -133,6 +142,17 @@ def custom_caps(text)
         end
       end
     end
+
+    # converts a — (em dash) by optional whitespace or a non-breaking space
+    # to the HTML entity and surrounds it in a span with a styled class.
+    #
+    # @param [String] text input text
+    # @return [String] input text with em dashes wrapped
+    def emdash(text)
+      text.gsub(/(\s| )—(?:mdash;|#8212;)?(\s| )/) { |str|
+        $1 + '<span class="emdash">&mdash;</span>' + $2
+      }.gsub(/(\w+)="(.*?)<span class="emdash">&mdash;<\/span>(.*?)"/, '\1="\2&mdash;\3"')
+    end
   end
 end
 

spec/fixtures/_layouts/default.html

@@ -38,5 +38,7 @@
 <p class="test-hyphenated-caps">{{ "The M65-A aircraft weights 10 tons." | caps }}</p>
 
 <p class="test-hyphenated-jt_caps">{{ "The M65-A aircraft weights 10 tons." | jt_caps }}</p>
+
+<p class="test-jt_emdash">{{ "And yet, when the car was finally delivered—nearly three months after it was ordered—she decided she no longer wanted it, leaving the dealer with an oddly equipped car that would be difficult to sell." | jt_emdash }}</p>
 </body>
 </html>

spec/jekyll/typogrify_spec.rb

@@ -114,4 +114,9 @@
     expect(contents).to match /<p class="test-hyphenated-jt_caps">The <span class="caps">M65-A<\/span> aircraft weights 10 tons.<\/p>/
     expect(contents).to_not match /<p class="test-hyphenated-jt_caps">The <span class="caps">M65<\/span>-A aircraft weights 10 tons.<\/p>/
   end
+
+  it "test jt_emdash" do
+    expect(contents).to match /<p class="test-jt_emdash">And yet, when the car was finally delivered—nearly three months after it was ordered—she decided she no longer wanted it, leaving the dealer with an oddly equipped car that would be difficult to sell.<\/p>/
+    expect(contents).to_not match /<p class="test-jt_emdash">And yet, when the car was finally delivered<span class="emdash">&mdash;<\/span>nearly three months after it was ordered<span class="emdash">&mdash;<\/span>she decided she no longer wanted it, leaving the dealer with an oddly equipped car that would be difficult to sell.<\/p>/
+  end
 end