Remove can_fail attribute from bindings generator

The binding generator no longer respects the can_fail attribute, since
its being removed from the metadata.

As a consequence all Neovim functions have an error signal. A quick grep
shows that this API is only used anyway.

bindings/function_static.cpp

@@ -6,6 +6,6 @@ const QList<Function> Function::knownFunctions = QList<Function>()
 	{% for param in f.parameters %}
 		<< QString("{{param.neovim_type}}")
 	{% endfor %}
-	, {% if f.can_fail%}true{%else%}false{%endif%})
+	, false)
 {% endfor %}
 	;

bindings/generate_bindings.py

@@ -131,7 +131,6 @@ def __init__(self, nvim_fun):
             print('Found unknown attributes for function %s: %s' % (self.name, u_attrs))
 
         self.argcount = len(self.parameters)
-        self.can_fail = self.fun.get('can_fail', False)
 
         # Build the argument string - makes it easier for the templates
         self.argstring = ', '.join(['%s %s' % (tv.native_type, tv.name) for tv in self.parameters])
@@ -154,17 +153,13 @@ def real_signature(self):
             params += '%s %s' % (p.native_type, p.name)
             params += ', '
         notes = ''
-        if self.can_fail:
-            notes += '!fails'
         return '%s %s(%s) %s' % (self.return_type.native_type,self.name,params, notes)
     def signature(self):
         params = ''
         for p in self.parameters:
             params += '%s %s' % (p.neovim_type, p.name)
             params += ', '
         notes = ''
-        if self.can_fail:
-            notes += '!fails'
         return '%s %s(%s) %s' % (self.return_type.neovim_type,self.name,params, notes)
 
 

bindings/neovim.cpp

@@ -69,11 +69,9 @@ void Neovim::handleResponseError(quint32 msgid, Function::FunctionId fun, const
 
 	switch(fun) {
 {% for f in functions %}
-{% if f.can_fail %}
 	case Function::NEOVIM_FN_{{f.name.upper()}}:
 		emit err_{{f.name}}(errMsg, res);
 		break;
-{% endif %}
 {% endfor %}
 	default:
 		m_c->setError(NeovimConnector::RuntimeMsgpackError, QString("Received error for function that should not fail: %s").arg(fun));

bindings/neovim.h

@@ -33,9 +33,7 @@ public slots:
 signals:
 {% for f in functions %}
 	void on_{{f.name}}({{f.return_type.native_type}});
-{% if f.can_fail %}
 	void err_{{f.name}}(const QString&, const QVariant&);
-{% endif%}
 
 {% endfor %}
 };