"Function to indent the current line.
This function will be called with no arguments.
If it is called somewhere where auto-indentation cannot be done
-\(f.ex. inside a string), the function should simply return `noindent'.
+\(e.g. inside a string), the function should simply return `noindent'.
Setting this function is all you need to make TAB indent appropriately.
Don't rebind TAB unless you really need to.")