Fix Go documentation generation (#172)

* Correction of the "parameters" accessibility problem in the Go mapper

The "parameters" attributes of the GoPythonMapper class instance was
not accessible from the "output_rst" function used to create the .rst
file. Thanks to this correction, the parameters are now accessible.

* Enhance the template used to genertae the .rst file from the .go source file

This modification allows to create a .rst file compatible with the
last version of Sphinx. Without this correction, the creation of documentation
was not possible. A "make html" command lead to an "AssertionError" Exception.

autoapi/mappers/go.py

@@ -123,10 +123,11 @@ class GoPythonMapper(PythonMapperBase):
         # Second level
         self.imports = obj.get("imports", [])
         self.children = []
-        self.parameters = map(
+        temp_parameters = map(
             lambda n: {"name": n["name"], "type": n["type"].lstrip("*")},
             obj.get("parameters", []),
         )
+        self.parameters = list(temp_parameters)
         self.docstring = obj.get("doc", "")
 
         # Go Specific

autoapi/templates/go/base_member.rst

@@ -1,26 +1,32 @@
-.. go:{{ obj.ref_type }}:: {{ obj.name }}
 {% if obj.type == 'func' %}
+    {# Creating the parameters line #}
+    {% set ns = namespace(tmpstring='') %}
     {% set argjoin = joiner(', ') %}
-    ({% for param in obj.parameters %}
-        {{ argjoin() }}{{ param.name }} {{ param.type }}
-    {% endfor %})
+    {% for param in obj.parameters %}
+        {% set ns.tmpstring = ns.tmpstring ~ argjoin() ~ param.name ~ ' ' ~ param.type %}
+    {% endfor %}
+.. {{ obj.ref_type }}:: {{ obj.name }}({{ ns.tmpstring }})
+{% else %}
+.. go:{{ obj.ref_type }}:: {{ obj.name }}
 {% endif %}
 
-    {% macro render() %}{{ obj.docstring }}{% endmacro %}
-    {{ render()|indent(4) }}
+{% macro render() %}{{ obj.docstring }}{% endmacro %}
+{{ render()|indent(4) }}
 
-    {# Don't define parameter description here, that can be done in the block
-    above #}
-    {% for param in obj.parameters %}
-    :type {{ param.name }}: {{ param.type }}
+{# Don't define parameter description here, that can be done in the block
+above #}
+{% for param in obj.parameters %}
+:param {{ param.name }}:
+:type {{ param.name }}: {{ param.type }}
+{% endfor %}
+{% if obj.returns %}
+:rtype: {{ obj.returns.type }}
+{% endif %}
+
+{% if obj.children %}
+    {% for child in obj.children|sort %}
+{% macro render_child() %}{{ child.render() }}{% endmacro %}
+{{ render_child()|indent(4) }}
     {% endfor %}
-    {% if obj.returns %}
-    :rtype: {{ obj.returns.type }}
-    {% endif %}
+{% endif %}
 
-    {% if obj.children %}
-        {% for child in obj.children|sort %}
-    {% macro render_child() %}{{ child.render() }}{% endmacro %}
-    {{ render_child()|indent(4) }}
-        {% endfor %}
-    {% endif %}