On 7 Aug 2016, at 21:09, Jacob Carlborg wrote:

[…] Is TextMate using the same encoding as the file or an internal encoding. Or is that an implementation detail?

Currently it uses UTF-8 internally but I would say it’s an implementation detail (1.x used UTF-16 for better compatibility with NSString and friends).

IMHO the tool should be updated to output warnings/errors as line:column and not byte offset.

I can file an enhancement request for the tool and see what they say.

If they won’t support this, we could add support to mate but I would prefer to keep it as an extension of the current -l/--line syntax, e.g. --line +42 to indicate a byte offset of 42.