automatic \bar "||:"?

[Mark Polesky]

Is there a way to set the first barline of 
each volta section to "||:" without doing it
manually each time?

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\version "2.11.65-1"

{ 
  %% I type:
  b'1 \repeat volta 2 { b' }
  
  %% I want:
  b'1 \bar "||:" \repeat volta 2 { b' }
}

\layout { indent=#0 ragged-right=##t system-count=#4 }

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Thanks
- Mark