printing: commit some refactors (probably broken)

printer/stubs.go

@@ -0,0 +1,23 @@
+package printer
+
+import (
+	"github.com/mmcloughlin/avo"
+	"github.com/mmcloughlin/avo/internal/prnt"
+)
+
+type stubs struct {
+	cfg Config
+	prnt.Generator
+}
+
+func NewStubs(cfg Config) Printer {
+	return &stubs{cfg: cfg}
+}
+
+func (s *stubs) Print(f *avo.File) ([]byte, error) {
+	s.Printf("package %s\n\n", s.cfg.Pkg)
+	for _, fn := range f.Functions {
+		s.Printf("%s\n", fn.Stub())
+	}
+	return s.Result()
+}