vim indentation

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To temporarily turn off automatic indenting by typing
:set paste
in command mode.

To turn back on:
:unset paste  
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According to filetype indenting happens.
:filetype indent on

want to know file type? try :set filetype - you will get answer.

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not so sophisticated:
set ai
set si

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source: http://www.serverwatch.com/tutorials/article.php/3845506/Automatic-Indenting-With-Vim.htm