This would add new nullable type for SQL enums

examples/gomods/README.md

@@ -2,7 +2,7 @@
 
 ## Steps
 
- 1. Go get enumer `go get -u  github.com/dmarkham/enumer`
- 2. `go generate` This should create `pill_enumer.go`
- 3. `go run  *.go` to see it in action
- 4. `go mod tidy` to remove the deps for `enumer` once your happy.
+1.  Go get enumer `go get -u github.com/igormiku/enumer`
+2.  `go generate` This should create `pill_enumer.go`
+3.  `go run *.go` to see it in action
+4.  `go mod tidy` to remove the deps for `enumer` once your happy.

examples/gomods/main.go

@@ -2,7 +2,7 @@ package main
 
 import "fmt"
 
-//go:generate go run github.com/dmarkham/enumer -type=Pill -json
+//go:generate go run github.com/igormiku/enumer -type=Pill -json
 type Pill int
 
 const (

go.mod

@@ -1,4 +1,4 @@
-module github.com/dmarkham/enumer
+module github.com/igormiku/enumer
 
 require (
 	github.com/pascaldekloe/name v1.0.0

sql.go

@@ -32,11 +32,45 @@ const scanMethod = `func (i *%[1]s) Scan(value interface{}) error {
 	*i = val
 	return nil
 }
+
+`
+const nullableImplementation = `
+type Null%[1]s struct {
+	%[1]s      %[1]s
+	Valid      bool
+}
+
+func NewNull%[1]s(val interface{}) (x Null%[1]s) {
+	x.Scan(val) // yes, we ignore this error, it will just be an invalid value.
+	return
+}
+
+// Scan implements the Scanner interface.
+func (x *Null%[1]s) Scan(value interface{}) (err error) {
+	if value == nil {
+		x.%[1]s, x.Valid = %[1]s(0), false
+		return
+	}
+
+	err = x.%[1]s.Scan(value)
+	x.Valid = (err == nil)
+	return
+}
+
+// Value implements the driver Valuer interface.
+func (x Null%[1]s) Value() (driver.Value, error) {
+	if !x.Valid {
+		return nil, nil
+	}
+	return x.%[1]s.String(), nil
+}
 `
 
 func (g *Generator) addValueAndScanMethod(typeName string) {
 	g.Printf("\n")
 	g.Printf(valueMethod, typeName)
 	g.Printf("\n\n")
 	g.Printf(scanMethod, typeName)
+	g.Printf("\n\n")
+	g.Printf(nullableImplementation, typeName)
 }

stringer.go

@@ -5,7 +5,7 @@
 // Enumer is a tool to generate Go code that adds useful methods to Go enums (constants with a specific type).
 // It started as a fork of Rob Pike’s Stringer tool
 //
-// Please visit http://github.com/dmarkham/enumer for a comprehensive documentation
+// Please visit http://github.com/igormiku/enumer for a comprehensive documentation
 package main
 
 import (
@@ -71,7 +71,7 @@ func Usage() {
 	_, _ = fmt.Fprintf(os.Stderr, "\tEnumer [flags] -type T [directory]\n")
 	_, _ = fmt.Fprintf(os.Stderr, "\tEnumer [flags] -type T files... # Must be a single package\n")
 	_, _ = fmt.Fprintf(os.Stderr, "For more information, see:\n")
-	_, _ = fmt.Fprintf(os.Stderr, "\thttp://godoc.org/github.com/dmarkham/enumer\n")
+	_, _ = fmt.Fprintf(os.Stderr, "\thttp://godoc.org/github.com/igormiku/enumer\n")
 	_, _ = fmt.Fprintf(os.Stderr, "Flags:\n")
 	flag.PrintDefaults()
 }