> ---------- Forwarded message ----------
> From: Peter Anglea <pe...@peteranglea.com>
> To: lilypond-user@gnu.org
> Date: Fri, 26 Oct 2018 10:12:17 -0400
> Subject: Complex --evaluate command line option
> I’m trying to use the -e (--evaluate) option to define a hash, not just a
> single variable. For instance
>
> lilypond -e ‘((define myhash (make-hash-table))(hashq-set! myhash
> ‘foo “bar”))’ file.ly
>
> The above doesn’t work. I think, obviously, it’s breaking at the single
> quote – ‘foo.
>
> I’ve tried escaping it with a backslash (\’foo) and a couple other things,
> but nothing seems to work.
>
> Is it possible to run complex Scheme code in the command line option,
> and/or am I just not escaping special characters the right way?
>
I'm just going to comment on bash shell syntax, since I'm not quite sure
what to expect the scheme code to do in lilypond, or if there are any
prerequisites of file.ly for this command to work.
In any case, for bash shell syntax:
Within single quotes, there is no evaluation, no escaping, and
everything is taken as-is.
Within double quotes, things are evaluated, and the backslash character
is used to escape (to prevent evaluation, as well as to include double
quotes within the string).
Outside of quotes, things are evaluated and the backslash character is
used to escape.
The only difference in this regard between double quotes and no quotes is
that everything within double quotes is taken as a "word", and outside of
quotes, whitespace delineates "words". (Outside quotes, you can escape
spaces to prevent splitting of words on whitespace).
Your above line would parse into these "words"
lilypond
-e
'((define myhash (make-hash-table))(hasq-set! myhash'
foo
"bar"
))
'file.ly
with the last expression having unmatched single quote, so it is not a
complete expression
Since your scheme expression has both single and double quotes, you would
need to put the entire scheme expression in double quotes, then escape the
double quotes around "bar":
lilypond -e "((define myhash (make-hash-table))(hashq-set! myhash 'foo
\"bar\"))" file.ly
Unfortunately, I'm not too familiar with what this should do, or if it
should work with any file.ly.
When I tried it against a random .ly file, I got:
lilypond -e "((define myhash (make-hash-table))(hashq-set! myhash 'foo
\"bar\"))" voices.ly
GNU LilyPond 2.19.80
<unnamed port>:1:8: In expression ((begin #<unspecified>) (hashq-set!
myhash # ...)):
<unnamed port>:1:8: Wrong type to apply: #<unspecified>
HTH,
Elaine Alt
415 . 341 .4954 "*Confusion is
highly underrated*"
ela...@flaminghakama.com
Producer ~ Composer ~ Instrumentalist
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