Add noms/primitives.go and relatedness

codegen/equals.go

@@ -0,0 +1,21 @@
+package gen
+
+import (
+	"github.com/clipperhouse/typewriter"
+)
+
+func init() {
+	templates = append(templates, &typewriter.Template{
+		Name: "noms",
+		Text: `
+func (self {{.Name}}) Equals(other Value) bool {
+	if other, ok := other.({{.Name}}); ok {
+		return self == other
+	} else {
+		return false
+	}
+}
+`,
+		TypeConstraint: typewriter.Constraint{Comparable: true},
+	})
+}

codegen/nomwriter.go

@@ -0,0 +1,43 @@
+package gen
+
+import (
+	"io"
+
+	. "github.com/attic-labs/noms/dbg"
+	"github.com/clipperhouse/typewriter"
+)
+
+var (
+	templates = typewriter.TemplateSlice{}
+)
+
+func init() {
+	Chk.NoError(typewriter.Register(&nomWriter{}))
+}
+
+type nomWriter struct{}
+
+func (nw *nomWriter) Name() string {
+	return "noms"
+}
+
+func (nw *nomWriter) Imports(t typewriter.Type) []typewriter.ImportSpec {
+	return []typewriter.ImportSpec{}
+}
+
+func (nw *nomWriter) Write(w io.Writer, typ typewriter.Type) error {
+	tag, found := typ.FindTag(nw)
+
+	if !found {
+		return nil
+	}
+
+	tmpl, err := templates.ByTag(typ, tag)
+	if err != nil {
+		return err
+	}
+	if err := tmpl.Execute(w, typ); err != nil {
+		return err
+	}
+	return nil
+}