|PostgreSQL 8.2.6 Documentation|
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Source code formatting uses 4 column tab spacing, with tabs preserved (i.e. tabs are not expanded to spaces). Each logical indentation level is one additional tab stop. Layout rules (brace positioning, etc) follow BSD conventions.
While submitted patches do not absolutely have to follow these formatting rules, it's a good idea to do so. Your code will get run through pgindent, so there's no point in making it look nice under some other set of formatting conventions.
The src/tools directory contains sample settings files that can be used with the emacs, xemacs or vim editors to help ensure that they format code according to these conventions.
The text browsing tools more and less can be invoked as
more -x4 less -x4
to make them show tabs appropriately.