Support template recursion (#11)

Author: mortenson

ripoff_file.go

@@ -55,12 +55,9 @@ func concatRows(templates *template.Template, existingRows map[string]Row, newRo
 			if err != nil {
 				return err
 			}
-			for templateRowId, templateRow := range ripoff.Rows {
-				_, rowExists := existingRows[templateRowId]
-				if rowExists {
-					return fmt.Errorf("row %s is defined more than once", rowId)
-				}
-				existingRows[templateRowId] = templateRow
+			err = concatRows(templates, existingRows, ripoff.Rows, enums)
+			if err != nil {
+				return err
 			}
 		} else {
 			existingRows[rowId] = row

testdata/import/templates/template_avatar.yml

@@ -0,0 +1,3 @@
+rows:
+  {{ .rowId }}:
+    url: {{ .avatarUrl }}

testdata/import/templates/template_users.yml

@@ -3,6 +3,8 @@ rows:
   users:uuid({{ $email }}):
     email: {{ $email }}
     avatar_id: avatars:uuid({{ $avatarUrl }})
+  # Template recursion is supported.
   avatars:uuid({{ $avatarUrl }}):
-    url: {{ $avatarUrl }}
+    template: template_avatar.yml
+    avatarUrl: {{ $avatarUrl }}
   {{ end }}