Move code generator into its own package.

cmd/pgen/main.go

@@ -11,6 +11,8 @@ import (
 	"path/filepath"
 	"regexp"
 	"strings"
+
+	"gitlab.wow.st/gmp/persist/generate"
 )
 
 type visitor struct{}
@@ -133,7 +135,7 @@ func main() {
 		if len(ts) == 0 {
 			continue
 		}
-		g := NewGenerator(pkg.Name)
+		g := generate.NewGenerator(pkg.Name)
 		for _,v := range ts {
 			g.Add(v.fun, v.name, v.typ)
 		}

generate/generate.go

@@ -1,4 +1,4 @@
-package main
+package generate
 
 import (
 	"io"

generate/template.go

@@ -1,4 +1,4 @@
-package main
+package generate
 const template string = `//Generated by gitlab.wow.st/persist/cmd/pgen.
 //Do not edit
 package main