How to generate a counter for repeated bars

[ian_hulin]

Please forgive me if this is an obvious case of RTFM, but how do you get to
disply a counter over a section of repeated bars.  I am using using unfold
as I don't want any actual ||:  . . .  :|| sections in the part.  I know
there are counters available for things like percent repeats and suchlike. 
I there any property or variable I can set to get the desired result?

For example I want to get \repeat unfold 4 {c4 d e f |} to generate

      1          2        3         4
| c d e f |c d e f|c d e f|c d e f|

I'm still learning the music notation syntax and haven't tried the delights
of customizing Lilypond with scheme yet.

Thanks in advance for any advice on cracking this one.

Cheers,

Ian Hulin
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