[TxMt] Spaces instead of Tabs

[Ulai Beekam]

When typing the space key in my code in TextMate, how can I let
TextMate use a particular number of spaces instead of that tab character?
I would like to always use 2 spaces instead of the tab character.

Also, how can I auto-format code that already have tabs (or tabs replaced by, say, 4 spaces)
to format it the way I want it (say, tabs replaced by 2 spaces)? Microsoft Visual Studio allowed me to do that. Does TextMate provide such facilities? (Guess I could always turn to regular expressions to fix such stuff.)
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