TODO

- [-] More input test cases?
- [-] Handle any warnings returned by PgQuery.parse
- [X] Limit number of warnings
- [ ] Optionally connect to a live DB to check referenced table/column names are valid
- [ ] Refactor and test the CLI front end
- [ ] Support for other SQL dialects
- [ ] JSON output
- [ ] Huge files
- [ ] Maybe truncate long 'at or near "blah"' strings