mathjax tweaks

- drop support for $$ in favour of separate opening and closing tags
- add shortcuts to add mathjax
- don't highlight any clozes in blue if field contains mathjax chars

anki/template/template.py

@@ -187,15 +187,21 @@ class Template:
         reg = clozeReg
         if not re.search(reg%ord, txt):
             return ""
+        mathjax = False
+        if '\[' in txt or '\(' in txt:
+            mathjax = True
         def repl(m):
             # replace chosen cloze with type
             if type == "q":
                 if m.group(3):
-                    return "<span class=cloze>[%s]</span>" % m.group(3)
+                    buf = "[%s]" % m.group(3)
                 else:
-                    return "<span class=cloze>[...]</span>"
+                    buf = "[...]"
             else:
-                return "<span class=cloze>%s</span>" % m.group(1)
+                buf = m.group(1)
+            if not mathjax:
+                buf = "<span class=cloze>[%s]</span>" % buf
+            return buf
         txt = re.sub(reg%ord, repl, txt)
         # and display other clozes normally
         return re.sub(reg%"\d+", "\\1", txt)

aqt/editor.py

@@ -185,6 +185,8 @@ class Editor:
             ("Ctrl+T, T", self.insertLatex),
             ("Ctrl+T, E", self.insertLatexEqn),
             ("Ctrl+T, M", self.insertLatexMathEnv),
+            ("Ctrl+M, M", self.insertMathjaxInline),
+            ("Ctrl+M, E", self.insertMathjaxBlock),
             ("Ctrl+Shift+X", self.onHtmlEdit),
             ("Ctrl+Shift+T", self.onFocusTags)
         ]
@@ -654,6 +656,10 @@ to a cloze type first, via Edit>Change Note Type."""))
 
     def onAdvanced(self):
         m = QMenu(self.mw)
+        a = m.addAction(_("MathJax inline"))
+        a.triggered.connect(self.insertMathjaxInline)
+        a = m.addAction(_("MathJax block"))
+        a.triggered.connect(self.insertMathjaxBlock)
         a = m.addAction(_("LaTeX"))
         a.triggered.connect(self.insertLatex)
         a = m.addAction(_("LaTeX equation"))
@@ -676,6 +682,12 @@ to a cloze type first, via Edit>Change Note Type."""))
     def insertLatexMathEnv(self):
         self.web.eval("wrap('[$$]', '[/$$]');")
 
+    def insertMathjaxInline(self):
+        self.web.eval("wrap('\\\\(', '\\\\)');")
+
+    def insertMathjaxBlock(self):
+        self.web.eval("wrap('\\\\[', '\\\\]');")
+
     # Links from HTML
     ######################################################################
 

web/mathjax/conf.js

@@ -4,6 +4,9 @@ window.MathJax = {
   TeX: {
     extensions: ["AMSmath.js","AMSsymbols.js","noErrors.js","noUndefined.js", "mhchem.js"]
   },
+  tex2jax: {
+      displayMath: [ ["\\[","\\]"] ],
+  },
   messageStyle: "none",
   skipStartupTypeset: true,
   showMathMenu: false,

web/reviewer.js

@@ -26,7 +26,6 @@ function _updateQA(html, fadeTime, onupdate, onshown) {
         } catch(err) {
             qa.text("Invalid HTML on card: "+err);
         }
-        _removeStylingFromMathjaxCloze();
         _runHook(onUpdateHook);
 
         // don't allow drags of images, which cause them to be deleted
@@ -106,19 +105,3 @@ function _typeAnsPress() {
         pycmd("ans");
     }
 }
-
-function _removeStylingFromMathjaxCloze() {
-    $(".cloze").each(function (i) {
-        if (_clozeIsInsideMathjax(this)) {
-            this.outerHTML = this.innerHTML;
-        }
-    });
-}
-
-function _clozeIsInsideMathjax(node) {
-    if (!node.previousSibling || node.previousSibling.nodeType !== 3) {
-        return;
-    }
-    // look for mathjax opening in previous text
-    return /\\\(|\$\$/.test(node.previousSibling.textContent);
-}