TextMate 2: How to permanently default to soft tabs (spaces instead of tabs)? SETUP
OS X 10.8
TextMate 2 -r9283
QUESTION
How can I permanently force TextMate to to always default to soft tabs (use spaces, not tabs)?
I want to know how to make TextMate default to this setting so that I don't have to constantly convert tabs to spaces while working on a file.
How do you permanently tell TextMate 2 to prefer soft tabs?
TextMate 2 uses a special file called .tm_properties to control lots of settings in the app. It will use ~/.tm_properties if present for global defaults. You can also add one inside a source tree to control settings for a particular project.

The setting you're looking for is:

softTabs = true


Just add that line to ~/.tm_properties (or create it if it doesn't exist).

You can read more about this file here.