FIX: Properly convert quotes to Markdown (#8808)

* FIX: Properly convert quotes to Markdown

When quoting a quote it used to convert the quote header, including the
user avatar and username, into a image and some text and then the
contents. This also caused issues when quoting full paragraphs (or when
selecting paragraphs by triple-clicking) because the user avatar and
name from the following quote would also be included.

This commit implements the support necessary to convert
<aside class="quote"> elements to proper Discourse quotes.

app/assets/javascripts/discourse/components/quote-button.js.es6

@@ -48,23 +48,21 @@ export default Component.extend({
       }
     }
 
-    let opts;
+    let opts = { raw: true };
     for (
       let element = selectedElement();
       element && element.tagName !== "ARTICLE";
       element = element.parentElement
     ) {
       if (element.tagName === "ASIDE" && element.classList.contains("quote")) {
-        opts = {
-          username:
+        opts.username =
           element.dataset.username ||
           element
             .querySelector(".title")
             .textContent.trim()
-              .replace(/:$/, ""),
-          post: element.dataset.post,
-          topic: element.dataset.topic
-        };
+            .replace(/:$/, "");
+        opts.post = element.dataset.post;
+        opts.topic = element.dataset.topic;
       }
     }
 

app/assets/javascripts/discourse/lib/to-markdown.js.es6

@@ -44,7 +44,6 @@ export class Tag {
     return [
       "address",
       "article",
-      "aside",
       "dd",
       "div",
       "dl",
@@ -89,6 +88,7 @@ export class Tag {
       ...Tag.blocks(),
       ...Tag.headings(),
       ...Tag.slices(),
+      "aside",
       "li",
       "td",
       "th",
@@ -126,6 +126,45 @@ export class Tag {
     };
   }
 
+  static aside() {
+    return class extends Tag.block("aside") {
+      constructor() {
+        super();
+      }
+
+      toMarkdown() {
+        if (!/\bquote\b/.test(this.element.attributes.class)) {
+          return super.toMarkdown();
+        }
+
+        const blockquote = this.element.children.find(
+          child => child.name === "blockquote"
+        );
+
+        if (!blockquote) {
+          return super.toMarkdown();
+        }
+
+        let text = Element.parse([blockquote], this.element) || "";
+        text = text.trim().replace(/^>/g, "");
+        if (text.length === 0) {
+          return "";
+        }
+
+        const username = this.element.attributes["data-username"];
+        const post = this.element.attributes["data-post"];
+        const topic = this.element.attributes["data-topic"];
+
+        const prefix =
+          username && post && topic
+            ? `[quote="${username}, post:${post}, topic:${topic}"]`
+            : "[quote]";
+
+        return `\n\n${prefix}\n${text}\n[/quote]\n\n`;
+      }
+    };
+  }
+
   static heading(name, i) {
     const prefix = `${[...Array(i)].map(() => "#").join("")} `;
     return Tag.block(name, prefix, "");
@@ -484,6 +523,7 @@ function tags() {
     ...Tag.slices().map(s => Tag.slice(s, "\n")),
     ...Tag.emphases().map(e => Tag.emphasis(e[0], e[1])),
     ...Tag.whitelists().map(t => Tag.whitelist(t)),
+    Tag.aside(),
     Tag.cell("td"),
     Tag.cell("th"),
     Tag.replace("br", "\n"),

test/javascripts/lib/to-markdown-test.js.es6

@@ -386,3 +386,30 @@ QUnit.test("converts image lightboxes to markdown", assert => {
 
   assert.equal(toMarkdown(html), markdown);
 });
+
+QUnit.test("converts quotes to markdown", assert => {
+  let html = `
+  <p>there is a quote below</p>
+  <aside class="quote no-group" data-username="foo" data-post="1" data-topic="2">
+  <div class="title" style="cursor: pointer;">
+  <div class="quote-controls"><span class="svg-icon-title" title="expand/collapse"><svg class="fa d-icon d-icon-chevron-down svg-icon svg-string" xmlns="http://www.w3.org/2000/svg"><use xlink:href="#chevron-down"></use></svg></span><a href="/t/hello-world-i-am-posting-an-image/158/1" title="go to the quoted post" class="back"><svg class="fa d-icon d-icon-arrow-up svg-icon svg-string" xmlns="http://www.w3.org/2000/svg"><use xlink:href="#arrow-up"></use></svg></a></div>
+  <img alt="" width="20" height="20" src="" class="avatar"> foo:</div>
+  <blockquote>
+  <p>this is a quote</p>
+  </blockquote>
+  </aside>
+  <p>there is a quote above</p>
+  `;
+
+  let markdown = `
+there is a quote below
+
+[quote="foo, post:1, topic:2"]
+this is a quote
+[/quote]
+
+there is a quote above
+`;
+
+  assert.equal(toMarkdown(html), markdown.trim());
+});