api: decode HTML entities in article excerpts

src/api.rs

@@ -249,9 +249,20 @@ fn plain_text_excerpt(html: &str, max_chars: usize) -> String {
         }
     }
     let collapsed: String = out.split_whitespace().collect::<Vec<_>>().join(" ");
-    if collapsed.chars().count() <= max_chars {
-        collapsed
+    let decoded = decode_html_entities(&collapsed);
+    if decoded.chars().count() <= max_chars {
+        decoded
     } else {
-        collapsed.chars().take(max_chars).collect::<String>() + "…"
+        decoded.chars().take(max_chars).collect::<String>() + "…"
     }
 }
+
+fn decode_html_entities(s: &str) -> String {
+    s.replace("&amp;", "&")
+     .replace("&lt;", "<")
+     .replace("&gt;", ">")
+     .replace("&quot;", "\"")
+     .replace("&apos;", "'")
+     .replace("&#39;", "'")
+     .replace("&nbsp;", " ")
+}