codegen: add ability to insert comments and blank lines into the generated code

cmd/subcmd_generate_models.go

@@ -4,7 +4,6 @@ import (
 	"errors"
 	"fmt"
 	"go/ast"
-	"go/printer"
 	"go/token"
 	"os"
 
@@ -37,11 +36,9 @@ var generate_model = &cobra.Command{
 			return ErrNoSuchTable
 		}
 
-		fset := token.NewFileSet()
-
 		if Must(cmd.Flags().GetBool("test")) {
 			file2 := modelgenerate.GenerateModelTestAST(table, modname)
-			PanicIf(printer.Fprint(os.Stdout, fset, file2))
+			PanicIf(modelgenerate.FprintWithComments(os.Stdout, file2))
 		} else {
 			decls := []ast.Decl{
 				&ast.GenDecl{
@@ -81,7 +78,7 @@ var generate_model = &cobra.Command{
 				Decls: decls,
 			}
 
-			PanicIf(printer.Fprint(os.Stdout, fset, file))
+			PanicIf(modelgenerate.FprintWithComments(os.Stdout, file))
 		}
 
 		return nil