Generate const documentation.

Fixes #340.

bind/gen_varconst.go

@@ -125,6 +125,16 @@ func (g *pyGen) genConstValue(c *Const) {
 		val = "False"
 	}
 	g.pywrap.Printf("%s = %s\n", c.GoName(), val)
+	if c.doc != "" {
+		lns := strings.Split(c.doc, "\n")
+		g.pywrap.Printf(`"""`)
+		g.pywrap.Printf("\n")
+		for _, l := range lns {
+			g.pywrap.Printf("%s\n", l)
+		}
+		g.pywrap.Printf(`"""`)
+		g.pywrap.Printf("\n")
+	}
 }
 
 func (g *pyGen) genEnum(e *Enum) {

bind/package.go

@@ -112,13 +112,28 @@ func (p *Package) getDoc(parent string, o types.Object) string {
 	n := o.Name()
 	switch tp := o.(type) {
 	case *types.Const:
+		// Check for untyped consts
 		for _, c := range p.doc.Consts {
 			for _, cn := range c.Names {
 				if n == cn {
 					return c.Doc
 				}
 			}
 		}
+		// Check for typed consts
+		scopeName := p.pkg.Scope().Lookup(n)
+		constType := scopeName.Type()
+		for _, t := range p.doc.Types {
+			if p.pkg.Path()+"."+t.Name == constType.String() {
+				for _, c := range t.Consts {
+					for _, cn := range c.Names {
+						if n == cn {
+							return c.Doc
+						}
+					}
+				}
+			}
+		}
 
 	case *types.Var:
 		if tp.IsField() && parent != "" {