Add model generator based on AST

pkg/codegen/tpl/db.go.tpl

@@ -0,0 +1,38 @@
+package db
+
+import (
+	_ "embed"
+	"fmt"
+
+	"github.com/jmoiron/sqlx"
+
+	"git.offline-twitter.com/offline-labs/gas-stack/pkg/db"
+)
+
+//go:embed schema.sql
+var sql_schema string
+
+// Database starts at version 0.  First migration brings us to version 1
+var MIGRATIONS = []string{}
+
+type DB struct {
+	DB *sqlx.DB
+}
+
+func Create(path string) (*DB, error) {
+	conf := db.Init(&sql_schema, &MIGRATIONS)
+	dbHandle, err := conf.Create(path)
+	if err != nil {
+		return nil, fmt.Errorf("creating db: %w", err)
+	}
+	return &DB{dbHandle}, nil
+}
+
+func Connect(path string) (*DB, error) {
+	conf := db.Init(&sql_schema, &MIGRATIONS)
+	dbHandle, err := conf.Connect(path)
+	if err != nil {
+		return nil, fmt.Errorf("creating db: %w", err)
+	}
+	return &DB{dbHandle}, nil
+}