Re: Is there a simple way to test for command line options?

[Jean Abou Samra]

Le 10/01/2023 à 19:11, Timothy Lanfear a écrit :
> The function ly:command-line-options returns a string with all the -d 
> options. The backend option is set to svg when when generating svg 
> output and absent by default.
>
> \version "2.22.0"
>
> #(let* ((options (ly:command-line-options))
>         (svg     (string-contains options "(backend . svg)")))
>   (if (integer? svg) (ly:message "svg") (ly:message "not svg")))
>
> {
>   c''1
> }



In recent versions, this is not always true: if you compile with the Cairo
backend, using -dbackend=cairo, the 'backend option is set to 'cairo
regardless of the output format. In fact, in the Cairo backend, you
can generate PDF and SVG in the same LilyPond invocation. Therefore,
I think it's best to use either environment variables, or the
-e / --evaluate option described here:

https://lilypond.org/doc/v2.24/Documentation/usage/command_002dline-usage#basic-command-line-options-for-lilypond

Best,
Jean

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