When I change the language in the Edit > Spelling > Show Spelling & Grammar menu from English to Italian, it seems to change the language for all textmate files, not just the one I'm working with.

Yes, this is an app-wide setting.

I suspect I'm doing something wrong here, but is there a way to have a per-file language for the spell checker?

Well, I believe there's no 'official' way to do it but one can do it by using my TMTools plugin. Look at

http://email.eva.mpg.de/~bibiko/downloads/textmate/

and the at help file http://email.eva.mpg.de/~bibiko/downloads/textmate/tmtoolshelp.html

3.2.23 spellCheckerLanguage '{to=XXX;}'

Important Note:

The TMTOOLS plug-in calls undocumented TextMate functions without an appropriate API. It is strongly recommend to use that plug-in for private scripting only!

The usage of that plug-in is at your own risk!

Cheers,

-Hans

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