Scheme expressions on lilypond command line (-e)

[Dave Seidel]

Hi all,

I am trying to define a variable on the command line that I can use within the .ly file. I've tried both

-e "(define-public part 1)"

and

-e "(define part 1)"

In the .ly file, I have a Scheme _expression_

#(if (= part 0)
  (define partName "")
  (define partName (string-append "S" part))
)

In either case, I get the error 

GUILE signaled an error for the _expression_ beginning here
#
 (if (= part 0)
Unbound variable: part

I guess I'm either defining the variable incorrectly, or dereferencing it incorrectly within the script. Can someone help?

Thanks,

Dave