Only add nodes once in mathmpl extension.

jenshnielsen · jenshnielsen · commit 53489b2e18aa · 2016-03-29T13:13:10.000+01:00
Fixes sphinx warnings
diff --git a/lib/matplotlib/sphinxext/mathmpl.py b/lib/matplotlib/sphinxext/mathmpl.py
@@ -87,16 +87,15 @@ def latex2html(node, source):
 
     return '<img src="%s/%s.png" %s%s/>' % (path, name, cls, style)
 
+
 def setup(app):
     setup.app = app
 
-    app.add_node(latex_math)
-    app.add_role('math', math_role)
-
     # Add visit/depart methods to HTML-Translator:
     def visit_latex_math_html(self, node):
         source = self.document.attributes['source']
         self.body.append(latex2html(node, source))
+
     def depart_latex_math_html(self, node):
         pass
 
@@ -109,13 +108,13 @@ def visit_latex_math_latex(self, node):
             self.body.extend(['\\begin{equation}',
                               node['latex'],
                               '\\end{equation}'])
+
     def depart_latex_math_latex(self, node):
         pass
 
-    app.add_node(latex_math, html=(visit_latex_math_html,
-                                   depart_latex_math_html))
-    app.add_node(latex_math, latex=(visit_latex_math_latex,
-                                    depart_latex_math_latex))
+    app.add_node(latex_math,
+                 html=(visit_latex_math_html, depart_latex_math_html),
+                 latex=(visit_latex_math_latex, depart_latex_math_latex))
     app.add_role('math', math_role)
     app.add_directive('math', math_directive,
                       True, (0, 0, 0), **options_spec)
