Fixes #80

Author: zachleat

src/markdownSyntaxHighlightOptions.js

@@ -30,7 +30,12 @@ module.exports = function (options = {}) {
 
     let hasHighlightNumbers = split.length > 0;
     let highlights = new HighlightLinesGroup(split.join("/"), "/");
-    let lines = html.split("\n").slice(0, -1); // The last line is empty.
+    let lines = html.split("\n");
+
+    // Trim last line if it is empty
+    if (lines[lines.length - 1] === "") {
+      lines = lines.slice(0, -1);
+    }
 
     lines = lines.map(function(line, j) {
       if(options.alwaysWrapLineHighlights || hasHighlightNumbers) {

test/EleventyTest.js

@@ -11,3 +11,14 @@ test("Diff output escaped #75", async t => {
 	t.is(json[0].content.trim(), `<pre class="language-html"><code class="language-html"><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>p</span><span class="token punctuation">></span></span>Hello<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>p</span><span class="token punctuation">></span></span></code></pre>
 <pre class="language-diff-html"><code class="language-diff-html"><span class="token deleted-sign deleted language-html"><span class="token prefix deleted">-</span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>p</span><span class="token punctuation">></span></span>Hello<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>p</span><span class="token punctuation">></span></span></span></code></pre>`);
 });
+
+test.only("diff-javascript #80", async t => {
+  let elev = new Eleventy("./test/issue-80/", "./test/issue-80/_site/", {
+    configPath: "./test/issue-80/.eleventy.js"
+  });
+  let json = await elev.toJSON();
+
+  t.is(json.length, 1);
+	t.is(json[0].content.trim(), `<pre class="language-diff-javascript"><code class="language-diff-javascript"><span class="token deleted-sign deleted language-javascript"><span class="token prefix deleted">-</span> <span class="token function">foo</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
+</span></code></pre>`);
+});

test/issue-80/.eleventy.js

@@ -0,0 +1,5 @@
+const syntaxHighlight = require("../../");
+
+module.exports = function(eleventyConfig) {
+  eleventyConfig.addPlugin(syntaxHighlight);
+};

test/issue-80/index.md

@@ -0,0 +1,3 @@
+```diff-javascript
+- foo()
+```