Update scripts.html to get settings variables

Author: ammsa

latexify/latexify/templates/latexify/scripts.html

@@ -1,7 +1,9 @@
+{% load latexify %}
 <script src="https://cdnjs.cloudflare.com/ajax/libs/KaTeX/0.6.0/katex.min.js"></script>
 <script>
-    var math_latex_inline_elements = document.getElementsByClassName("django-latexify math inline");
-    var math_latex_block_elements = document.getElementsByClassName("django-latexify math block");
+
+    var math_latex_inline_elements = document.getElementsByClassName('{% value_from_settings "LATEX_MATH_INLINE_CSS_CLASS" %}');
+    var math_latex_block_elements = document.getElementsByClassName('{% value_from_settings "LATEX_MATH_BLOCK_CSS_CLASS" %}');
     latex_render_math(math_latex_inline_elements, false);
     latex_render_math(math_latex_block_elements, true);
 

latexify/latexify/templatetags/latexify.py

@@ -82,3 +82,22 @@ def latexify(text,
 
     return {'latex_type': latex_type,
             'latex_text': mark_safe(text)}
+
+
+@register.tag
+def value_from_settings(parser, token):
+    try:
+        # split_contents() knows not to split quoted strings.
+        tag_name, var = token.split_contents()
+    except ValueError:
+        raise template.TemplateSyntaxError, "%r tag requires a single argument" % token.contents.split()[0]
+    return ValueFromSettings(var)
+
+
+class ValueFromSettings(template.Node):
+    def __init__(self, var):
+        self.arg = template.Variable(var)
+
+    def render(self, context):
+        return getattr(latex_settings,
+                       re.sub(r'\W+', '', str(self.arg)))