+indentation. The indent program can help you to stick to it:
+
+indent -br -brs -ce -bbo -bad -bap --dont-break-procedure-type
+ --no-tabs --cuddle-do-while --cuddle-else --indent-level2
+ --leave-preprocessor-space --no-space-after-function-call-names
+ <myfile>
+
+FIXME: this list of arguments is still to be discussed, maybe