katex: copy-paste support for Latex code, upgraded to katex 0.16.0

assets/javascripts/initializers/discourse-math-katex.js

@@ -5,9 +5,13 @@ function ensureKaTeX() {
   return loadScript("/plugins/discourse-math/katex/katex.min.js").then(() => {
     return loadScript("/plugins/discourse-math/katex/katex.min.css", {
       css: true,
-    }).then(() => {
-      return loadScript("/plugins/discourse-math/katex/mhchem.min.js");
-    });
+    })
+      .then(() => {
+        return loadScript("/plugins/discourse-math/katex/mhchem.min.js");
+      })
+      .then(() => {
+        return loadScript("/plugins/discourse-math/katex/copy-tex.min.js");
+      });
   });
 }
 

public/katex/README.md

@@ -8,9 +8,10 @@
 
 ```bash
 DMPATH=/path/to/discourse-math  # set this to your path to the discourse-math repo
+cd /tmp
 wget -O- https://github.com/KaTeX/KaTeX/releases/latest/download/katex.tar.gz | tar -zx
 cp katex/fonts/*.woff* $DMPATH/public/katex/fonts/
-cp katex/katex.min.* katex/contrib/mhchem.min.js $DMPATH/public/katex/
+cp katex/katex.min.* katex/contrib/{mhchem,copy-tex}.min.js $DMPATH/public/katex/
 sed -i "s~url(fonts/~url(/plugins/discourse-math/katex/fonts/~g" $DMPATH/public/katex/katex.min.css
 ```