Add HTML markup to method/function return typehint

sphinx/writers/html.py

@@ -174,10 +174,12 @@ def depart_desc_type(self, node: Element) -> None:
         pass
 
     def visit_desc_returns(self, node: Element) -> None:
-        self.body.append(' → ')
+        self.body.append(' <span class="sig-return">')
+        self.body.append('<span class="sig-return-icon">&#x2192;</span>')
+        self.body.append(' <span class="sig-return-typehint">')
 
     def depart_desc_returns(self, node: Element) -> None:
-        pass
+        self.body.append('</span></span>')
 
     def visit_desc_parameterlist(self, node: Element) -> None:
         self.body.append('<span class="sig-paren">(</span>')

sphinx/writers/html5.py

@@ -145,10 +145,12 @@ def depart_desc_type(self, node: Element) -> None:
         pass
 
     def visit_desc_returns(self, node: Element) -> None:
-        self.body.append(' → ')
+        self.body.append(' <span class="sig-return">')
+        self.body.append('<span class="sig-return-icon">&#x2192;</span>')
+        self.body.append(' <span class="sig-return-typehint">')
 
     def depart_desc_returns(self, node: Element) -> None:
-        pass
+        self.body.append('</span></span>')
 
     def visit_desc_parameterlist(self, node: Element) -> None:
         self.body.append('<span class="sig-paren">(</span>')

tests/roots/test-html_signaturereturn_icon/conf.py

@@ -0,0 +1 @@
+extensions = ['sphinx.ext.autodoc']

tests/roots/test-html_signaturereturn_icon/index.rst

@@ -0,0 +1,4 @@
+test-html_signaturereturn_icon
+==============================
+
+.. py:function:: foo(a: bool, b: int) -> str

tests/test_build_html.py

@@ -1625,3 +1625,11 @@ def test_html_permalink_icon(app):
     assert ('<h1>The basic Sphinx documentation for testing<a class="headerlink" '
             'href="#the-basic-sphinx-documentation-for-testing" '
             'title="Permalink to this headline"><span>[PERMALINK]</span></a></h1>' in content)
+
+
+@pytest.mark.sphinx('html', testroot='html_signaturereturn_icon')
+def test_html_signaturereturn_icon(app):
+    app.build()
+    content = (app.outdir / 'index.html').read_text()
+
+    assert ('<span class="sig-return-icon">&#x2192;</span>' in content)