Bar line at beginning of piece

[Lukas-Fabian Moser]

Hi,

is there an "idiomatic" way of forcing LilyPond to print a bar line "|" 
at the beginning of the piece other than doing the hack of adding

\grace s1 \bar "|"

before the music?

My problem is that I need to do this programmatically with a large 
number of short scores. If any of those starts with a time signature, 
e.g. \time 3/4, then the result will be the usual issue #34 problem of

C | 3/4

Now, obviously I could write a function that extracts an initial time 
signature from a music variable and moves it in front of the \grace s1 
bit, which amounts to more hacking in order to gloss over the problems 
of the initial hack :-).

Hence my question: Is there a mechanism for allowing a barline at the 
beginning of the piece not involving grace notes? (If not, I _think_ 
that the behaviour of not printing any bar lines at the beginning should 
be made an overridable default, so I'd add this to my already over-long 
list of "things I'd like to add to core LilyPond as soon as I have time".)

Lukas